WO2007050985A2 - Macromolecular antioxidants based on stξrically hindered phenolic phosphites - Google Patents
Macromolecular antioxidants based on stξrically hindered phenolic phosphites Download PDFInfo
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- WO2007050985A2 WO2007050985A2 PCT/US2006/042235 US2006042235W WO2007050985A2 WO 2007050985 A2 WO2007050985 A2 WO 2007050985A2 US 2006042235 W US2006042235 W US 2006042235W WO 2007050985 A2 WO2007050985 A2 WO 2007050985A2
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- 239000003963 antioxidant agent Substances 0.000 title abstract description 70
- -1 phenolic phosphites Chemical class 0.000 title description 45
- 150000001875 compounds Chemical class 0.000 claims abstract description 125
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- 238000000034 method Methods 0.000 claims description 61
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 125000000547 substituted alkyl group Chemical group 0.000 claims description 20
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- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 17
- 230000003647 oxidation Effects 0.000 claims description 11
- 238000007254 oxidation reaction Methods 0.000 claims description 11
- 125000003107 substituted aryl group Chemical group 0.000 claims description 11
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- 125000003710 aryl alkyl group Chemical group 0.000 claims description 8
- FAIAAWCVCHQXDN-UHFFFAOYSA-N phosphorus trichloride Chemical compound ClP(Cl)Cl FAIAAWCVCHQXDN-UHFFFAOYSA-N 0.000 claims description 5
- 230000002194 synthesizing effect Effects 0.000 claims 1
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- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 239000004006 olive oil Substances 0.000 description 1
- 235000008390 olive oil Nutrition 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002540 palm oil Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000000312 peanut oil Substances 0.000 description 1
- 229940097156 peroxyl Drugs 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000000825 pharmaceutical preparation Substances 0.000 description 1
- 229940127557 pharmaceutical product Drugs 0.000 description 1
- 125000004934 phenanthridinyl group Chemical group C1(=CC=CC2=NC=C3C=CC=CC3=C12)* 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical compound [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- UHZYTMXLRWXGPK-UHFFFAOYSA-N phosphorus pentachloride Chemical compound ClP(Cl)(Cl)(Cl)Cl UHZYTMXLRWXGPK-UHFFFAOYSA-N 0.000 description 1
- 125000005545 phthalimidyl group Chemical group 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 125000002206 pyridazin-3-yl group Chemical group [H]C1=C([H])C([H])=C(*)N=N1 0.000 description 1
- 125000000246 pyrimidin-2-yl group Chemical group [H]C1=NC(*)=NC([H])=C1[H] 0.000 description 1
- 125000004527 pyrimidin-4-yl group Chemical group N1=CN=C(C=C1)* 0.000 description 1
- 125000004528 pyrimidin-5-yl group Chemical group N1=CN=CC(=C1)* 0.000 description 1
- 125000000719 pyrrolidinyl group Chemical group 0.000 description 1
- 235000021067 refined food Nutrition 0.000 description 1
- 125000006413 ring segment Chemical group 0.000 description 1
- 235000005713 safflower oil Nutrition 0.000 description 1
- 239000003813 safflower oil Substances 0.000 description 1
- 239000008159 sesame oil Substances 0.000 description 1
- 235000011803 sesame oil Nutrition 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 238000012306 spectroscopic technique Methods 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002600 sunflower oil Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 125000001712 tetrahydronaphthyl group Chemical group C1(CCCC2=CC=CC=C12)* 0.000 description 1
- 125000003831 tetrazolyl group Chemical group 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 150000007970 thio esters Chemical group 0.000 description 1
- DPUOLQHDNGRHBS-MDZDMXLPSA-N trans-Brassidic acid Chemical compound CCCCCCCC\C=C\CCCCCCCCCCCC(O)=O DPUOLQHDNGRHBS-MDZDMXLPSA-N 0.000 description 1
- UWHZIFQPPBDJPM-BQYQJAHWSA-N trans-vaccenic acid Chemical compound CCCCCC\C=C\CCCCCCCCCC(O)=O UWHZIFQPPBDJPM-BQYQJAHWSA-N 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 235000019155 vitamin A Nutrition 0.000 description 1
- 239000011719 vitamin A Substances 0.000 description 1
- 235000019154 vitamin C Nutrition 0.000 description 1
- 239000011718 vitamin C Substances 0.000 description 1
- 235000019165 vitamin E Nutrition 0.000 description 1
- 229940046009 vitamin E Drugs 0.000 description 1
- 239000011709 vitamin E Substances 0.000 description 1
- 229940045997 vitamin a Drugs 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic System
- C07F9/02—Phosphorus compounds
- C07F9/06—Phosphorus compounds without P—C bonds
- C07F9/08—Esters of oxyacids of phosphorus
- C07F9/141—Esters of phosphorous acids
- C07F9/1414—Esters of phosphorous acids with arylalkanols
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic System
- C07F9/02—Phosphorus compounds
- C07F9/06—Phosphorus compounds without P—C bonds
- C07F9/08—Esters of oxyacids of phosphorus
- C07F9/141—Esters of phosphorous acids
- C07F9/1412—Polyol derivatives esterified at least twice by phosphorous acid groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic System
- C07F9/02—Phosphorus compounds
- C07F9/06—Phosphorus compounds without P—C bonds
- C07F9/08—Esters of oxyacids of phosphorus
- C07F9/141—Esters of phosphorous acids
- C07F9/145—Esters of phosphorous acids with hydroxyaryl compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic System
- C07F9/02—Phosphorus compounds
- C07F9/547—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom
- C07F9/6564—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms
- C07F9/6571—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and oxygen atoms as the only ring hetero atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic System
- C07F9/02—Phosphorus compounds
- C07F9/547—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom
- C07F9/6564—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms
- C07F9/6571—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and oxygen atoms as the only ring hetero atoms
- C07F9/6574—Esters of oxyacids of phosphorus
- C07F9/65746—Esters of oxyacids of phosphorus the molecule containing more than one cyclic phosphorus atom
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/527—Cyclic esters
Definitions
- Antioxidants are employed to prevent oxidation in a wide range of materials, for example, plastics, elastomers, lubricants, petroleum based products (lubricants, gasoline, aviation fuels, and engine oils), cooking oil, cosmetics, processed food products, and the like. While many small molecule antioxidants exist, there is a continuing need for new antioxidants that have improved properties.
- Triaryl phophites containing alkyl-substituted phenyl rings have been found to be effective synthetic latex stabilizers.
- antioxidants with higher antioxidant activity and higher thermal stability.
- the present invention relates to high performance, sterically hindered, phenol and phosphite based macromolecular antioxidants.
- the sterically hindered, phenol and phosphite based macromolecules of the present invention have enhanced antioxidant activity and better thermal stability compared to commercially available antioxidants.
- the present invention pertains to sterically hindered phenol and phosphite based compounds represented by a formula selected from I-III:
- R is:
- Ri and R 2 in each occurrence independently is an optionally substituted alkyl, an optionally substituted aryl or an optionally substituted aralkyl.
- X and Y in each occurrence independently is a bond, -O-, -NH-, -C(O)NH-, -NHC(O)-, -C(O)O-, -OC(O)- or -CH 2 -.
- n and m in each occurrence is independently O or a positive integer.
- i and j in each occurrence independently is O, 1, 2, 3 or 4.
- R" is an optionally substituted alkyl.
- the present invention pertains to methods of preventing oxidation. The method comprises combining an oxidizable material with a compound represented by a structural formula selected from I-III.
- the present invention pertains to methods for preparing sterically hindered phenol and phosphite based compound, having a formula selected from I-III.
- the method comprises combining a phenol containing compound with a phosphorous containing compound, such as, phosphorous trichloride in a suitable solvent under conditions suitable for reaction of the phenol containing compound with the phosphorous containing compound.
- a phosphorous containing compound such as, phosphorous trichloride
- the present invention pertains to the use of the disclosed compounds as antioxidants in a wide range of materials including, but not limited to, food, plastics, elastomers, composites and petroleum based products.
- the compounds of the invention provide significant oxidative resistance and thermal stability.
- the compounds of the invention generally have higher oxidative induction time, higher thermal stability and lower change of Melt flow or viscosity than commercially available antioxidants
- the enhanced molecular activity comes from the synergistic chemistry between the two main integral components (phenolic and phosphite components) of these macromolecular antioxidants.
- the compounds disclosed herein do not discolor the substance to which they are added.
- the compounds disclosed herein impart fewer odors to the substance to which they are added than currently available antioxidants.
- the disclosed compounds provide enhanced oven aging properties to organic materials subject to attack by heat and oxygen.
- the disclosed compounds have higher antioxidant activity and higher thermal stability than antioxidants which are currently known or used in the art.
- FIG. 1 is a comparison of the Oxidative Induction Time (OIT) of one embodiment of the invention, namely, tris [N-(4-hydroxyphenyl),-3-(2,6-di-tert.- butyl, 4-hydroxyphenyl) propionamide] phosphate, versus commercially available Irganox ® .
- OIT Oxidative Induction Time
- FIG. 2 is the Fourier Transform Infrared (FT-IR) spectrum of tris [N-(4- hydroxyphenyl),-3-(2,6-di-tert.-butyl, 4-hydroxyphenyl) propionamide] phosphate of the invention.
- FT-IR Fourier Transform Infrared
- FIG. 3 is the Ultraviolet (UV) spectrum of tris [N-(4-hydroxyphenyl),-3- (2,6-di-tert.-butyl, 4-hydroxyphenyl) propionamide] phosphate of the invention.
- FIG.4 is the Thermogravimetric Analysis (TGA) of tris [N-(4- hydroxyphenyl),-3-(2,6-di-tert.-butyl, 4-hydroxyphenyl) propionamide] phosphate of the invention.
- the present invention pertains to sterically hindered phenol and phosphite based compounds, represented by a formula selected from I-
- R is:
- Ri and R 2 in each occurrence independently is an optionally substituted alkyl, optionally substituted aryl or optionally substituted aralkyl.
- each Rj and R 2 are independently an optionally substituted alkyl.
- each Rj and R 2 are independently a C1-C6 alkyl.
- R is:
- X and Y in each occurrence independently is a bond, -O-, -NH-, -C(O)NH-, -NHC(O)-, -C(O)O-, -OC(O)- or -CH 2 -.
- X and Y in each occurrence independently is a bond or -CH 2 -.
- X and Y in each occurrence independently is a bond, -O- or -CH 2 -.
- X and Y in each occurrence independently is a bond, -NH- or -CH 2 -.
- X and Y in each occurrence independently is a bond, -C(O)NH- or - CH 2 -.
- X and Y in each occurrence independently is a bond, -NHC(O)-, or -CH 2 -. In yet another embodiment, X and Y in each occurrence independently is a bond, -C(O)O- or -CH 2 -. In yet another embodiment, X and Y in each occurrence independently is a bond, -OC(O)- or -CH 2 -.
- n and m in each occurrence independently is O or a positive integer. In one embodiment, n and m in each occurrence independently is O to 18. In another embodiment, n and m in each occurrence independently is O to 12. In yet another embodiment, n and m are in each occurrence independently is O to 6.
- i and j in each occurrence independently independently is O, 1, 2, 3 or 4. In one embodiment i and j in each occurrence independently is O, 1 or 2. In a particular embodiment, i is O. In another particular embodiment j is 2.
- R" is an optionally substituted alkyl. In one embodiment R" is C1-C6 alkyl.
- the present invention pertains to compounds represented by structural formula I. In one embodiment the present invention pertains to compounds represented by structural formula TL.
- the present invention pertains to compounds represented by structural formula III.
- R is:
- n and m in each occurrence independently is 0 to 12, and the remainder of the variables are as described above for structural formulas I-III.
- R, n and m are as described immediately above, and R 1 and R 2 in each occurrence, independently is an optionally substituted alkyl; i and j in each occurrence independently is 0, 1 or 2; and the remainder of the variables are as described above for structural formulas I-III.
- n and m in each occurrence independently is 0 to 6; and the remainder of the variables are as described above for structural formulas I-III.
- X and Y in each occurrence, independently is a bond, - C(O)NH- or -CH 2 -; and the remainder of the variables are as described above for structural fo ⁇ nulas I-III.
- n and m in each occurrence independently is O or a positive integer. In one embodiment, n and m in each occurrence, independently is O to 18. In another embodiment, n and m in each occurrence, independently is O to 12. In yet another embodiment, n and m in each occurrence, independently is O to 6.
- i and j in each occurrence independently is O, 1, 2, 3 or 4. In one embodiment, i and j in each occurrence, independently is 0, 1 or 2. In a particular embodiment, i is 0. In another particular embodiment, j is 2.
- Z' is -C(O)O-.
- Z' is -OC(O)-.
- Z' is -C(O)NH-.
- Z' is -NHC(O)- .
- Z' is -NH-.
- Z' is -C(O)- . In yet another embodiment, Z' is -O-. In yet another embodiment, Z' is -S-. In yet another embodiment, Z' is -C(O)OC(O)- . In yet another embodiment, Z' is a bond.
- R' is an optionally substituted C1-C6 alkyl, -OH, -NH 2 , -SH, an optionally substituted aryl, an ester or
- R' adjacent to the -OH group is an optionally substituted bulky alkyl group (e.g., butyl, sec-butyl, tert-butyl, 2-propyl, 1,1-dimethylhexyl, and the like).
- bulky alkyl group e.g., butyl, sec-butyl, tert-butyl, 2-propyl, 1,1-dimethylhexyl, and the like.
- R'i is an optionally substituted C1-C6 alkyl, an optionally substituted aryl, an optionally substituted aralkyl, -OH, -NH 2 , -SH, or C1-C6 alkyl ester wherein at least one Ri adjacent to the -OH group is a bulky alkyl group (e.g., butyl, sec-butyl, tert-butyl, 2-propyl, 1,1-dimethylhexyl, and the like). ).
- R' 2 is an optionally substituted C1-C6 alkyl, an optionally substituted aryl, an optionally substituted aralkyl, -OH, -NH 2 , -SH, or ester.
- X' is -C(O)O-.
- X' is -OC(O)-.
- X' is -C(O)NH-.
- X' is -NHC(O)- .
- X' is -NH-.
- X' is -C(O)- . In yet another embodiment X' is -O-. In yet another embodiment X' is -S-. In yet another embodiment X' is -C(O)OC(O)- . In yet another embodiment X' is a bond.
- M' is H, an optionally substituted aryl, an optionally substituted C1-C20 linear or branched alkyl chain with or without any functional group anywhere in the _ ⁇ _
- o is 0 or a positive integer. Preferably o is 0 to 18. More preferably o is 0 to 12. Even more preferably o is 0 to 6.
- R' 2 is C1-C6 alkyl, -OH, -NH 2 , -SH, aryl, ester, aralkyl or
- the present invention relates to a compound of formula I-III, wherein M is
- alkyl as used herein means a saturated straight-chain, branched or cyclic hydrocarbon. When straight-chained or branched, an alkyl group is typically C1-C8, more typically C1-C6; when cyclic, an alkyl group is typically C3- C 12, more typically C3-C7 alkyl ester. Examples of alkyl groups include methyl, ethyl, n-propyl, ⁇ -propyl, ⁇ -butyl, sec-butyl and tert-butyl and 1,1-dimethylhexyl.
- alkoxy as used herein is represented by -OR**, wherein R** is an alkyl group as defined above.
- acyl as used herein is represented by -C(O)R**, wherein R** is an alkyl group as defined above.
- alkyl ester as used herein means a group represented by
- R** is an alkyl group as defined above.
- aromatic group used alone or as part of a larger moiety as in “aralkyl”, includes carbocyclic aromatic rings and heteroaryl rings.
- aromatic group may be used interchangeably with the terms “aryl”, “aryl ring” “aromatic ring”, “aryl group” and “aromatic group”.
- Carbocyclic aromatic ring groups have only carbon ring atoms (typically six to fourteen) and include monocyclic aromatic rings such as phenyl and fused polycyclic aromatic ring systems in which a carbocyclic aromatic ring is fused to one or more aromatic rings (carbocyclic aromatic or heteroaromatic). Examples include 1- naphthyl, 2-naphthyl, 1-anthracyl and 2-anthracyl.
- Carbocyclic aromatic ring is a group in which an aromatic ring is fused to one or more non-aromatic rings (carbocyclic or heterocyclic), such as in an indanyl, phthalimidyl, naphthimidyl, phenanthridinyl, or tetrahydronaphthyl, where the radical or point of attachment is on the aromatic ring.
- heteroaryl refers to heteroaromatic ring groups having five to fourteen members, including monocyclic heteroaromatic rings and polycyclic aromatic rings in which a monocyclic aromatic ring is fused to one or more other aromatic ring (carbocyclic aromatic or heteroaromatic). Heteroaryl groups have one or more ring heteroatoms.
- heteroaryl groups include 2-furanyl, 3-furanyl, N- imidazolyl, 2-imidazolyl, 4-imidazolyl, 5-imidazolyl, 3-isoxazolyl, 4-isoxazolyl, 5- isoxazolyl, 2-oxadiazolyl, 5-oxadiazolyl, 2-oxazolyl, 4-oxazolyl, 5-oxazolyl, 3- pyrazolyl, 4-pyrazolyl, 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, 2-pyridyl, 3-pyridyl, 4- pyridyl, 2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, 3-pyridazinyl, 2-thiazolyl, 4- thiazolyl, 5-thiazolyl, 2-triazolyl, 5-triazolyl, tetrazolyl, 2-thienyl, 3-thienyl, carbazolyl, 2-benzothienyl, 3-
- heteroaryl is a group in which an aromatic ring is fused to one or more non-aromatic rings (carbocyclic or heterocyclic), where the radical or point of attachment is on the aromatic ring.
- heteroatom means nitrogen, oxygen, or sulfur and includes any oxidized form of nitrogen and sulfur, and the quaternized form of any basic nitrogen.
- nitrogen includes a substitutable nitrogen of a heteroaryl or non- aromatic heterocyclic group.
- the nitrogen in a saturated or partially unsaturated ring having 0-3 heteroatoms selected from oxygen, sulfur or nitrogen, the nitrogen may be N (as in 3,4-dihydro-2H-pyrrolyl), NH (as in pyrrolidinyl) or NR" (as in N- substituted pyrrolidinyl), wherein R" is a suitable substituent for the nitrogen atom in the ring of a non-aromatic nitrogen-containing heterocyclic group, as defined below.
- aralkyl group is an alkyl groups substituted with an aryl group as defined above.
- An optionally substituted aryl group as defined herein may contain one or more substitutable ring atoms, such as carbon or nitrogen ring atoms.
- suitable substituents on a substitutable ring carbon atom of an aryl group include - OH, C1-C3 alkyl, C1-C3 haloalkyl, -NO 2 , C1-C3 alkoxy, C1-C3 haloalkoxy, -CN, -NH 2 , C1-C3 alkylamino, C1-C3 dialkylamino, -C(O)NH 2 , -C(O)NH(C 1-C3 alkyl), -C(O)(C 1-C3 alkyl), -NHC(O)H, -NHC(O)(C 1-C3 alkyl), -C(O)N(C 1-C3 alkyl) 2 , -NHC(O)O-(C 1-C3 alkyl), -C(O)
- Suitable substituents on a substitutable ring nitrogen atom of an aryl group include C1-C3 alkyl, NH 2 , C1-C3 alkylamino, C1-C3 dialkylamino,
- An optionally substituted alkyl group as defined herein may contain one or more substituents.
- Preferred substituents on alkyl groups are as defined throughout the specification. In certain embodiments optionally substituted alkyl groups are unsubstituted.
- a "spiro cycloalkyl” group is a cycloalkyl group which shares one ring carbon atom with a carbon atom in an alkylene group or alkyl group, wherein the carbon atom being shared in the alkyl group is not a terminal carbon atom.
- macromolecular antioxidants of the present invention exploit the differences in activities (ks, equilibrium constant) of, for example, homo- or hetero- type antioxidant moieties.
- Antioxidant moieties include, for example, hindered phenolic groups, unhindered phenolic groups, aminic groups and thioester groups, etc. of which there can be one or more present in each macromolecular antioxidant molecule.
- a homo- type antioxidant macromolecule comprises antioxidant moieties which are all same, for example, hindered phenolic, -OH groups.
- a hetero- type antioxidant macromolecule comprises at least one different type of moiety, for example, hindred phenolic and aminic groups in the one macromolecule.
- This difference in activities can be the result of, for example, the substitutions on neighboring carbons or the local chemical or physical environment (for example, due to electrochemical or stereochemical factors) which can be due in part to the macromolecular nature of molecules.
- a series of macromolecular antioxidant moieties of the present invention with different chemical structures can be represented by WlH, W2H, W3H, to WnH.
- WlH, W2H, W3H, to WnH in one embodiment of the ⁇
- WlH and W2H can have rate constants of kl and k2 respectively.
- the reactions involving these moieties and peroxyl radicals can be represented as:
- ROO. is a peroxyl radical resulting from, for example, initiation steps involving oxidation activity, for example:
- This transfer mechanism may take place either in intra- or inter-molecular macromolecules.
- the transfer mechanism (5) could take place between moieties residing on the same macromolecule (intra- type) or residing on different macromolecules (inter-type).
- the antioxidant properties described immediately above (equation 5) of the macromolecular antioxidants of the present invention result in advantages including, but not limited to: _ ⁇ ⁇
- the following items are of significant interest for enhanced antioxidant activity in the design of the macromolecular antioxidants of the present invention: a) The activity of proposed macromolecular antioxidant is dependent on the regeneration of WlH in equation (5) either through inter- or intra-molecular activities involving homo- or hetero-type antioxidant moieties. b) Depending on the rates constants of WlH and W2H it is possible to achieve performance enhancements by many multiples and not just incremental improvements.
- more than two types of antioxidant moieties with different rate constants are used in the methods of the present invention.
- the present invention pertains to the use of the disclosed compounds to inhibit oxidation in an oxidizable material.
- a method of "inhibiting oxidation” is a method that inhibits the propagation of a free radical-mediated process.
- Free radicals can be generated by heat, light, ionizing radiation, metal ions and some proteins and enzymes.
- Inhibiting oxidation also includes inhibiting reactions caused by the presence of oxygen, ozone or another compound capable of generating these gases or reactive equivalents of these gases.
- oxidizable material is any material which is subject to oxidation by free-radicals or oxidative reaction caused by the presence of oxygen, ozone or another compound capable of generating these gases or reactive equivalents thereof.
- Antioxidant compounds of the present invention can be used to prevent oxidation in a wide variety of compositions where free radical mediated oxidation leads to deterioration of the quality of the composition, including edible products such as oils, foods (e.g., meat products, dairy products, cereals, etc.), and other products containing fats or other compounds subject to oxidation.
- Antioxidant compounds can also be present in plastics and other polymers, elastomers (e.g., natural or synthetic rubber), petroleum products (e.g., fossil fuels such as gasoline, kerosene, diesel oil, heating oil, propane, jet fuel), lubricants, paints, pigments or other colored items, soaps and cosmetics (e.g., creams, lotions, hair products).
- the antioxidant compounds can be used to coat a metal as a rust and corrosion inhibitor. Antioxidant compounds additionally can protect antioxidant vitamins (Vitamin A, Vitamin C, Vitamin E) and pharmaceutical products from degradation. In food products, the antioxidant compounds can prevent rancidity. In plastics, the antioxidant compounds can prevent the plastic from becoming brittle and cracking. Antioxidant compounds of the present invention can be added to oils to prolong their shelf life and properties. These oils can be formulated as vegetable shortening or margarine. Oils generally come from plant sources and include cottonseed oil, linseed oil, olive oil, palm oil, corn oil, peanut oil, soybean oil, castor oil, coconut oil, safflower oil, sunflower oil, canola (rapeseed) oil and sesame oil.
- oils contain one or more unsaturated fatty acids such as caproleic acid, palmitoleic acid, oleic acid, vaccenic acid, elaidic acid, brassidic acid, erucic acid, nervonic acid, linoleic acid, eleosteric acid, alpha-linolenic acid, gamma-linolenic acid, and arachidonic acid, or partially hydrogenated or trans-hydrogenated variants thereof.
- Antioxidant compounds of the present invention are also advantageously added to food or other consumable products containing one or more of these fatty acids.
- a packaging material can be coated with an antioxidant compound (e.g., by spraying the antioxidant compound or by applying as a thin film coating), blended with or mixed with an antioxidant compound, or otherwise have an antioxidant compound present within it.
- the present invention relates to a process for preparing compounds of the present invention.
- Compounds of the present invention can be prepared by a one pot process, comprising the step of combining a phenol containing compound with a suitable phosphorous containing compound in a suitable solvent under conditions suitable for the reaction of the phenol containing compound with the phosphorous containing compound.
- Suitable phenol containing compounds include:
- Suitable phosphorous containing compounds are those which are capable of reacting with phenol containing compounds to produce compounds represented by Structural Formula I - III, including, for example, phosphorous trichloride, phosphorous pentachloride, phosphoric acid and phosphoryl trichloride.
- Suitable solvents are those which do not contain any acidic protons and dissolve the starting material and the side products, but do ' not dissolve the end product.
- suitable solvents include, for example, dichloromethane, toluene, tetrahydrofuran, dichloromethane, chloroform, dioxane and acetonitrile.
- the reaction of the phenol containing compound with the phosphorous containing compound occurs at 25 0 C. In other embodiments, the reaction of the phenol containing compound with the phosphorous containing compound occurs below 25 0 C. In other embodiments, the reaction of the phenol containing compound with the phosphorous containing compound occurs at a temperature between 25 0 C and 0 0 C.
- the reaction of the phenol containing compound with the phosphorous containing compound occurs at a temperature between 15 0 C and 0 0 C. In other embodiments, the reaction of the phenol containing compound with the phosphorous containing compound occurs at a temperature between 5 0 C and 0 0 C. In other embodiments, the reaction of the phenol containing compound with the phosphorous containing compound occurs at O 0 C.
- reaction of the phenol containing compound with the phosphorous containing compound takes place under a nitrogen atmosphere.
- the reaction takes place over 5 hours. In certain other embodiment the reaction takes place in less than 5 hours. In certain other embodiments the reaction takes place in one hour. In certain other embodiment the reaction takes place in less than one hour. In certain other embodiments the reaction takes place for a period of 30 to 40 minutes.
- the suitable solvent is removed by distillation
- the compound of the present invention are purified via crystallization using techniques known in the art.
- the crystals are further filtered and washed using techniques known in the art.
- Scheme 1 is a representative example of the synthesis of a compound of the present invention.
- Scheme 1 shows the synthesis of a sterically hindered phenol and phosphite based compound of structural formula I.
- the macromolecular antioxidant S was synthesized by one pot reaction of phenol with phosphorous trichloride using dichloromethane as a solvent at 0 °C. The yield of the title compound was more than 95%.
- Scheme 2 shows the synthesis of a sterically hindered phenol and phosphite based compound of structural formula II.
- Scheme 3 shows the synthesis of a sterically hindered phenol and phosphite based compound of structural formula III.
- the sterically hindered phenol and phosphate based antioxidant is:
- Example 2 Stabilization of polypropylene by tris [N-(4-hydroxyphenyl),-3-(2,6-di- tert.-butyl, 4-hydroxyphenyl) propionamide] phosphite S.
- FIG 1 shows that tris [N-(4- hydroxyphenyl),-3-(2,6-di-tert.-butyl, 4-hydroxyphenyl) propionamide] phosphite has a significantly higher oxidative induction time than commercially available
Abstract
Sterically hindered phenol and phosphite based compounds, represented by a formula selected from (I-III), in and their use as antioxidants in a wide range of materials including, but not limited to, food, plastics, elastomers, composites and petroleum based products is disclosed herein.
Description
MACROMOLECULAR ANTIOXIDANTS BASED ON STERICALLY HINDERED PHENOLS AND PHOSPHITES
RELATED APPLICATION(S)
This application claims the benefit of U.S. Provisional Application No. 60/731,021, filed on October 27, 2005. The entire teachings of the above application(s) are incorporated herein by reference.
BACKGROUND OF THE INVENTION
Antioxidants are employed to prevent oxidation in a wide range of materials, for example, plastics, elastomers, lubricants, petroleum based products (lubricants, gasoline, aviation fuels, and engine oils), cooking oil, cosmetics, processed food products, and the like. While many small molecule antioxidants exist, there is a continuing need for new antioxidants that have improved properties.
The commercial use of triaryl phophites in latex is well known. Triaryl' phophites containing alkyl-substituted phenyl rings have been found to be effective synthetic latex stabilizers. However, there is a continuing need for antioxidants with higher antioxidant activity and higher thermal stability.
SUMMARY OF THE INVENTION
The present invention relates to high performance, sterically hindered, phenol and phosphite based macromolecular antioxidants. In certain embodiments, the sterically hindered, phenol and phosphite based macromolecules of the present invention have enhanced antioxidant activity and better thermal stability compared to commercially available antioxidants.
In particular, the present invention pertains to sterically hindered phenol and phosphite based compounds represented by a formula selected from I-III:
II and
R is:
Ri and R2 in each occurrence, independently is an optionally substituted alkyl, an optionally substituted aryl or an optionally substituted aralkyl.
X and Y in each occurrence, independently is a bond, -O-, -NH-, -C(O)NH-, -NHC(O)-, -C(O)O-, -OC(O)- or -CH2-. n and m in each occurrence, is independently O or a positive integer. i and j in each occurrence, independently is O, 1, 2, 3 or 4.
R" is an optionally substituted alkyl.
In another embodiment, the present invention pertains to methods of preventing oxidation. The method comprises combining an oxidizable material with a compound represented by a structural formula selected from I-III.
In yet another embodiment, the present invention pertains to methods for preparing sterically hindered phenol and phosphite based compound, having a formula selected from I-III. The method comprises combining a phenol containing compound with a phosphorous containing compound, such as, phosphorous trichloride in a suitable solvent under conditions suitable for reaction of the phenol containing compound with the phosphorous containing compound. In yet another embodiment the present invention pertains to the use of the disclosed compounds as antioxidants in a wide range of materials including, but not limited to, food, plastics, elastomers, composites and petroleum based products.
The compounds of the invention provide significant oxidative resistance and thermal stability. The compounds of the invention generally have higher oxidative induction time, higher thermal stability and lower change of Melt flow or viscosity than commercially available antioxidants Without wishing to be bound by theory it is believed that the enhanced molecular activity comes from the synergistic chemistry between the two main integral components (phenolic and phosphite components) of these macromolecular antioxidants. In certain embodiments, the compounds disclosed herein, do not discolor the substance to which they are added. In certain other embodiments the compounds disclosed herein impart fewer odors to the substance to which they are added than currently available antioxidants. In certain other embodiments, the disclosed compounds provide enhanced oven aging properties to organic materials subject to attack by heat and oxygen. In certain other embodiments the disclosed compounds have higher antioxidant activity and higher thermal stability than antioxidants which are currently known or used in the art.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, is a comparison of the Oxidative Induction Time (OIT) of one embodiment of the invention, namely, tris [N-(4-hydroxyphenyl),-3-(2,6-di-tert.-
butyl, 4-hydroxyphenyl) propionamide] phosphate, versus commercially available Irganox®.
FIG. 2 is the Fourier Transform Infrared (FT-IR) spectrum of tris [N-(4- hydroxyphenyl),-3-(2,6-di-tert.-butyl, 4-hydroxyphenyl) propionamide] phosphate of the invention.
FIG. 3 is the Ultraviolet (UV) spectrum of tris [N-(4-hydroxyphenyl),-3- (2,6-di-tert.-butyl, 4-hydroxyphenyl) propionamide] phosphate of the invention.
FIG.4 is the Thermogravimetric Analysis (TGA) of tris [N-(4- hydroxyphenyl),-3-(2,6-di-tert.-butyl, 4-hydroxyphenyl) propionamide] phosphate of the invention.
DETAILED DESCRIPTION OF THE INVENTION
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
In one embodiment, the present invention pertains to sterically hindered phenol and phosphite based compounds, represented by a formula selected from I-
III:
I π and
III
R is:
In another embodiment R is:
In yet another embodiment R is:
X and Y in each occurrence independently is a bond, -O-, -NH-, -C(O)NH-, -NHC(O)-, -C(O)O-, -OC(O)- or -CH2-. In one embodiment, X and Y in each occurrence independently is a bond or -CH2-. In another embodiment. X and Y in each occurrence independently is a bond, -O- or -CH2-. In yet another embodiment, X and Y in each occurrence independently is a bond, -NH- or -CH2-. In yet another embodiment, X and Y in each occurrence independently is a bond, -C(O)NH- or - CH2-. In yet another embodiment, X and Y in each occurrence independently is a bond, -NHC(O)-, or -CH2-. In yet another embodiment, X and Y in each occurrence independently is a bond, -C(O)O- or -CH2-. In yet another embodiment, X and Y in each occurrence independently is a bond, -OC(O)- or -CH2-. n and m in each occurrence independently is O or a positive integer. In one embodiment, n and m in each occurrence independently is O to 18. In another embodiment, n and m in each occurrence independently is O to 12. In yet another embodiment, n and m are in each occurrence independently is O to 6. i and j in each occurrence independently is O, 1, 2, 3 or 4. In one embodiment i and j in each occurrence independently is O, 1 or 2. In a particular embodiment, i is O. In another particular embodiment j is 2.
R" is an optionally substituted alkyl. In one embodiment R" is C1-C6 alkyl.
In one embodiment the present invention pertains to compounds represented by structural formula I.
In one embodiment the present invention pertains to compounds represented by structural formula TL.
In one embodiment the present invention pertains to compounds represented by structural formula III. In a particular embodiment, for compounds of the present invention represented by structural formulas I-III, R is:
In another particular embodiment, for compounds of the present invention represented by structural formulas I-III, R, n and m are as described immediately above, and R1 and R2 in each occurrence, independently is an optionally substituted alkyl; i and j in each occurrence independently is 0, 1 or 2; and the remainder of the variables are as described above for structural formulas I-III.
In yet another particular embodiment, for compounds of the present invention represented by structural formulas I-III, Ri, R2, i and j are as described immediately above, and R is:
In another particular embodiment, for compounds of the present invention represented by structural formulas I-III, Ri, R2, i, j, R, n and m are as described immediately above, and X and Y in each occurrence, independently is a bond or - CH2-; and the remainder of the variables are as described above for structural formulas I-III.
In another particular embodiment, for compounds of the present invention represented by structural formulas I-III, Ri, R2, i, j, R, n and m are as described immediately above, and X and Y in each occurrence, independently is a bond, -O- or -CH2-; and the remainder of the variables are as described above for structural formulas I-III.
In another particular embodiment, for compounds of the present invention represented by structural formulas I-III, Ri, R2, i, j, R, n and m are as described immediately above, and X and Y in each occurrence, independently is a bond, -NH- or -CH2-; and the remainder of the variables are as described above for structural formulas I-III.
In another particular embodiment, for compounds of the present invention represented by structural formulas I-III, Ri, R2, i, j, R, n and m are as described
_ ^ _
immediately above, and X and Y in each occurrence, independently is a bond, - C(O)NH- or -CH2-; and the remainder of the variables are as described above for structural foπnulas I-III.
In another particular embodiment, for compounds of the present invention represented by structural formulas I-III, Ri, R2, i, j, R, n and m are as described immediately above, and X and Y in each occurrence, independently is a bond, - NHC(O)-, or -CH2-; and the remainder of the variables are as described above for structural formulas I-III.
In another particular embodiment, for compounds of the present invention represented by structural formulas I-III, Ri, R2, i, j, R, n and m are as described immediately above, and X and Y in each occurrence, independently is a bond, - C(O)O- or -CH2-; and the remainder of the variables are as described above for structural formulas I-III.
In another particular embodiment, for compounds of the present invention represented by structural formulas I-III, Ri, R2, i, j, R, n and m are as described immediately above, and X and Y in each occurrence, independently is a bond, -OC(O)- or -CH2-; and the remainder of the variables are as described above for structural formulas I-III.
In an additional embodiment, for formulas I-III R is:
Z' is -C(O)O-, -OC(O)-, -C(O)NH-, -NHC(O)-, -NH-, -CH=N-, -C(O)-, -O-, -S-, -C(O)OC(O)- or a bond. In one embodiment, Z' is -C(O)O-. In another
embodiment, Z' is -OC(O)-. In yet another embodiment, Z' is -C(O)NH-. In yet another embodiment, Z' is -NHC(O)- . In yet another embodiment, Z' is -NH-. In yet another embodiment, Z' is -CH=N-. In yet another embodiment, Z' is -C(O)- . In yet another embodiment, Z' is -O-. In yet another embodiment, Z' is -S-. In yet another embodiment, Z' is -C(O)OC(O)- . In yet another embodiment, Z' is a bond.
R' is an optionally substituted C1-C6 alkyl, -OH, -NH2, -SH, an optionally substituted aryl, an ester or
R'i is an optionally substituted C1-C6 alkyl, an optionally substituted aryl, an optionally substituted aralkyl, -OH, -NH2, -SH, or C1-C6 alkyl ester wherein at least one Ri adjacent to the -OH group is a bulky alkyl group (e.g., butyl, sec-butyl, tert-butyl, 2-propyl, 1,1-dimethylhexyl, and the like). ).
R'2 is an optionally substituted C1-C6 alkyl, an optionally substituted aryl, an optionally substituted aralkyl, -OH, -NH2, -SH, or ester.
X' is -C(O)O-, -OC(O)-, -C(O)NH-, -NHC(O)-, -NH-, -CH=N-, -C(O)-, -0-, -S-, -C(O)OC(O)- or a bond. In one embodiment X' is -C(O)O-. In another embodiment X' is -OC(O)-. In yet another embodiment X' is -C(O)NH-. In yet another embodiment X' is -NHC(O)- . In yet another embodiment X' is -NH-. In yet another embodiment X' is -CH=N-. In yet another embodiment X' is -C(O)- . In yet another embodiment X' is -O-. In yet another embodiment X' is -S-. In yet another embodiment X' is -C(O)OC(O)- . In yet another embodiment X' is a bond. M' is H, an optionally substituted aryl, an optionally substituted C1-C20 linear or branched alkyl chain with or without any functional group anywhere in the
_ ^ _
chain, or
In yet another embodiment, for formulas I-III R is:
R'2 is C1-C6 alkyl, -OH, -NH2, -SH, aryl, ester, aralkyl or
In yet another embodiment, the present invention relates to a compound of formula I-III, wherein M is
Wherein p is 0, 1, 2, 3 or 4; and the values and preferred values for the remainder of the variables are as described above for formulas I-III.
The term "alkyl" as used herein means a saturated straight-chain, branched or cyclic hydrocarbon. When straight-chained or branched, an alkyl group is typically C1-C8, more typically C1-C6; when cyclic, an alkyl group is typically C3- C 12, more typically C3-C7 alkyl ester. Examples of alkyl groups include methyl, ethyl, n-propyl, ώø-propyl, π-butyl, sec-butyl and tert-butyl and 1,1-dimethylhexyl.
The term "alkoxy" as used herein is represented by -OR**, wherein R** is an alkyl group as defined above.
The term "acyl" as used herein is represented by -C(O)R**, wherein R** is an alkyl group as defined above. The term "alkyl ester" as used herein means a group represented by
-C(O)OR**, where R** is an alkyl group as defined above.
The term "aromatic group" used alone or as part of a larger moiety as in "aralkyl", includes carbocyclic aromatic rings and heteroaryl rings. The term "aromatic group" may be used interchangeably with the terms "aryl", "aryl ring" "aromatic ring", "aryl group" and "aromatic group".
Carbocyclic aromatic ring groups have only carbon ring atoms (typically six to fourteen) and include monocyclic aromatic rings such as phenyl and fused polycyclic aromatic ring systems in which a carbocyclic aromatic ring is fused to one or more aromatic rings (carbocyclic aromatic or heteroaromatic). Examples include 1- naphthyl, 2-naphthyl, 1-anthracyl and 2-anthracyl. Also included within the scope of the term "carbocyclic aromatic ring", as it is used herein, is a group in which an aromatic ring is fused to one or more non-aromatic rings (carbocyclic or heterocyclic), such as in an indanyl, phthalimidyl, naphthimidyl, phenanthridinyl, or tetrahydronaphthyl, where the radical or point of attachment is on the aromatic ring. The term "heteroaryl", "heteroaromatic", "heteroaryl ring", "heteroaryl group" and "heteroaromatic group", used alone or as part of a larger moiety as in "heteroaralkyl" refers to heteroaromatic ring groups having five to fourteen members, including monocyclic heteroaromatic rings and polycyclic aromatic rings in which a monocyclic aromatic ring is fused to one or more other aromatic ring (carbocyclic aromatic or heteroaromatic). Heteroaryl groups have one or more ring heteroatoms. Examples of heteroaryl groups include 2-furanyl, 3-furanyl, N- imidazolyl, 2-imidazolyl, 4-imidazolyl, 5-imidazolyl, 3-isoxazolyl, 4-isoxazolyl, 5- isoxazolyl, 2-oxadiazolyl, 5-oxadiazolyl, 2-oxazolyl, 4-oxazolyl, 5-oxazolyl, 3- pyrazolyl, 4-pyrazolyl, 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, 2-pyridyl, 3-pyridyl, 4- pyridyl, 2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, 3-pyridazinyl, 2-thiazolyl, 4- thiazolyl, 5-thiazolyl, 2-triazolyl, 5-triazolyl, tetrazolyl, 2-thienyl, 3-thienyl, carbazolyl, 2-benzothienyl, 3-benzothienyl, 2-benzofuranyl, 3-benzofuranyl,
_ H _
2-indolyl, 3-indolyl, 2-quinolinyl, 3-quinolinyl, 2-benzothiazole, 2-benzooxazole, 2-benzimidazole, 2-quinolinyl, 3-quinolinyl, 1-isoquinolinyl, 3-quinolinyl, 1-isoindolyl and 3-isoindolyl. Also included within the scope of the term "heteroaryl", as it is used herein, is a group in which an aromatic ring is fused to one or more non-aromatic rings (carbocyclic or heterocyclic), where the radical or point of attachment is on the aromatic ring.
The term "heteroatom" means nitrogen, oxygen, or sulfur and includes any oxidized form of nitrogen and sulfur, and the quaternized form of any basic nitrogen. Also the term "nitrogen" includes a substitutable nitrogen of a heteroaryl or non- aromatic heterocyclic group. As an example, in a saturated or partially unsaturated ring having 0-3 heteroatoms selected from oxygen, sulfur or nitrogen, the nitrogen may be N (as in 3,4-dihydro-2H-pyrrolyl), NH (as in pyrrolidinyl) or NR" (as in N- substituted pyrrolidinyl), wherein R" is a suitable substituent for the nitrogen atom in the ring of a non-aromatic nitrogen-containing heterocyclic group, as defined below.
An "aralkyl group", as used herein is an alkyl groups substituted with an aryl group as defined above.
An optionally substituted aryl group as defined herein may contain one or more substitutable ring atoms, such as carbon or nitrogen ring atoms. Examples of suitable substituents on a substitutable ring carbon atom of an aryl group include - OH, C1-C3 alkyl, C1-C3 haloalkyl, -NO2, C1-C3 alkoxy, C1-C3 haloalkoxy, -CN, -NH2, C1-C3 alkylamino, C1-C3 dialkylamino, -C(O)NH2, -C(O)NH(C 1-C3 alkyl), -C(O)(C 1-C3 alkyl), -NHC(O)H, -NHC(O)(C 1-C3 alkyl), -C(O)N(C 1-C3 alkyl)2, -NHC(O)O-(C 1-C3 alkyl), -C(O)OH, -C(O)O-(C 1-C3 alkyl), -NHC(O)NH2, -NHC(0)NH(Cl-C3 alkyl), -NHC(O)N(C 1-C3 alkyl)2, -SO2NH2 -SO2NH(Cl- C3alkyl), -SO2N(C 1-C3alkyl)2, NHSO2H or NHSO2(C 1-C3 alkyl). Preferred substituents on aryl groups are as defined throughout the specification. In certain embodiments optionally substituted aryl groups are unsubstituted
Examples of suitable substituents on a substitutable ring nitrogen atom of an aryl group include C1-C3 alkyl, NH2, C1-C3 alkylamino, C1-C3 dialkylamino,
-C(O)NH2, -C(O)NH(C 1-C3 alkyl), -C(O)(C 1-C3 alkyl), -CO2 R**, -C(O)C(O)R**, -C(O)CH3, -C(O)OH, -C(O)O-(C1-C3 alkyl), -SO2NH2 -SO2NH(C1-C3alkyl),
^
-SO2N(C 1-C3alkyl)2, NHSO2H, NHSO2(C 1-C3 alkyl), -C(HS)NH2, -C(HS)NH(Cl- C3 alkyl), -C(=S)N(C1-C3 alkyl)2, -C(HNH)-N(H)2, -C(=NH)-NH(C1-C3 alkyl) and -C(=NH)-N(C1-C3 alkyl)2,
An optionally substituted alkyl group as defined herein may contain one or more substituents. Examples of suitable substituents for an alkyl group include those listed above for a substitutable carbon of an aryl and the following: =O, =S, =NNHR**, =NN(R**)2, =NNHC(0)R**, =NNHC02 (alkyl), =NNHS02 (alkyl), =NR**, spiro cycloalkyl group or fused cycloalkyl group. R** in each occurrence, independently is -H or C1-C6 alkyl. Preferred substituents on alkyl groups are as defined throughout the specification. In certain embodiments optionally substituted alkyl groups are unsubstituted.
A "spiro cycloalkyl" group is a cycloalkyl group which shares one ring carbon atom with a carbon atom in an alkylene group or alkyl group, wherein the carbon atom being shared in the alkyl group is not a terminal carbon atom. Without wishing to be bound by any theory or limited to any mechanism it is believed that macromolecular antioxidants of the present invention exploit the differences in activities (ks, equilibrium constant) of, for example, homo- or hetero- type antioxidant moieties. Antioxidant moieties include, for example, hindered phenolic groups, unhindered phenolic groups, aminic groups and thioester groups, etc. of which there can be one or more present in each macromolecular antioxidant molecule. As used herein a homo- type antioxidant macromolecule comprises antioxidant moieties which are all same, for example, hindered phenolic, -OH groups. As used herein a hetero- type antioxidant macromolecule comprises at least one different type of moiety, for example, hindred phenolic and aminic groups in the one macromolecule.
This difference in activities can be the result of, for example, the substitutions on neighboring carbons or the local chemical or physical environment (for example, due to electrochemical or stereochemical factors) which can be due in part to the macromolecular nature of molecules. In one embodiment of the present invention, a series of macromolecular antioxidant moieties of the present invention with different chemical structures can be represented by WlH, W2H, W3H, to WnH. In one embodiment of the
^
- 16 -
present invention, two types of antioxidant moieties of the present invention can be represented by: WlH and W2H. In certain embodiments WlH and W2H can have rate constants of kl and k2 respectively. The reactions involving these moieties and peroxyl radicals can be represented as:
kl ROO. +WlH → ROOH+WL(I)
k2 ROO.+W2H → ROOH+W2. (2)
where ROO. is a peroxyl radical resulting from, for example, initiation steps involving oxidation activity, for example:
RH -4R. + H. (3)
R. + 02 → ROO. (4)
In one particular embodiment of the present invention kl » k2 in equations (1) and (2). As a result, the reactions would take place in such a way that there is a decrease in concentration of Wl . free radicals due their participation in the regeneration of active moiety W2H in the molecule according equation (5):
Wl . + W2H → WlH + W2. (5) (transfer equilibrium)
This transfer mechanism may take place either in intra- or inter-molecular macromolecules. The transfer mechanism (5) could take place between moieties residing on the same macromolecule (intra- type) or residing on different macromolecules (inter-type).
In certain embodiments of the present invention, the antioxidant properties described immediately above (equation 5) of the macromolecular antioxidants of the present invention result in advantages including, but not limited to:
_ χ η
a) Consumption of free radicals Wl. according to equation (5) can result in a decrease of reactions of Wl. with hydroperoxides and hydrocarbons (RH). b) The regeneration of WlH provides extended protection of materials. This is a generous benefit to sacrificial type of antioxidants that are used today. Regeneration of WlH assists in combating the oxidation process The increase in the concentration of antioxidant moieties WlH (according to equation 5) extends the shelf life of materials.
In certain embodiments of the present invention, the following items are of significant interest for enhanced antioxidant activity in the design of the macromolecular antioxidants of the present invention: a) The activity of proposed macromolecular antioxidant is dependent on the regeneration of WlH in equation (5) either through inter- or intra-molecular activities involving homo- or hetero-type antioxidant moieties. b) Depending on the rates constants of WlH and W2H it is possible to achieve performance enhancements by many multiples and not just incremental improvements.
In certain embodiments of the present invention, more than two types of antioxidant moieties with different rate constants are used in the methods of the present invention.
In certain embodiments, the present invention pertains to the use of the disclosed compounds to inhibit oxidation in an oxidizable material.
For purposes of the present invention, a method of "inhibiting oxidation" is a method that inhibits the propagation of a free radical-mediated process. Free radicals can be generated by heat, light, ionizing radiation, metal ions and some proteins and enzymes. Inhibiting oxidation also includes inhibiting reactions caused by the presence of oxygen, ozone or another compound capable of generating these gases or reactive equivalents of these gases.
As used herein the term "oxidizable material" is any material which is subject to oxidation by free-radicals or oxidative reaction caused by the presence of oxygen, ozone or another compound capable of generating these gases or reactive equivalents thereof.
, fi
Antioxidant compounds of the present invention can be used to prevent oxidation in a wide variety of compositions where free radical mediated oxidation leads to deterioration of the quality of the composition, including edible products such as oils, foods (e.g., meat products, dairy products, cereals, etc.), and other products containing fats or other compounds subject to oxidation. Antioxidant compounds can also be present in plastics and other polymers, elastomers (e.g., natural or synthetic rubber), petroleum products (e.g., fossil fuels such as gasoline, kerosene, diesel oil, heating oil, propane, jet fuel), lubricants, paints, pigments or other colored items, soaps and cosmetics (e.g., creams, lotions, hair products). The antioxidant compounds can be used to coat a metal as a rust and corrosion inhibitor. Antioxidant compounds additionally can protect antioxidant vitamins (Vitamin A, Vitamin C, Vitamin E) and pharmaceutical products from degradation. In food products, the antioxidant compounds can prevent rancidity. In plastics, the antioxidant compounds can prevent the plastic from becoming brittle and cracking. Antioxidant compounds of the present invention can be added to oils to prolong their shelf life and properties. These oils can be formulated as vegetable shortening or margarine. Oils generally come from plant sources and include cottonseed oil, linseed oil, olive oil, palm oil, corn oil, peanut oil, soybean oil, castor oil, coconut oil, safflower oil, sunflower oil, canola (rapeseed) oil and sesame oil. These oils contain one or more unsaturated fatty acids such as caproleic acid, palmitoleic acid, oleic acid, vaccenic acid, elaidic acid, brassidic acid, erucic acid, nervonic acid, linoleic acid, eleosteric acid, alpha-linolenic acid, gamma-linolenic acid, and arachidonic acid, or partially hydrogenated or trans-hydrogenated variants thereof. Antioxidant compounds of the present invention are also advantageously added to food or other consumable products containing one or more of these fatty acids.
The shelf life of many materials and substances contained within the materials, such as packaging materials, are enhanced by the presence of an antioxidant compound of the present invention. The addition of an antioxidant compound to a packaging material is believed to provide additional protection to the product contained inside the package. In addition, the properties of many packaging materials themselves, particularly polymers, are enhanced by the presence of an
antioxidant regardless of the application (i.e., not limited to use in packaging). Common examples of packaging materials include paper, cardboard and various plastics and polymers. A packaging material can be coated with an antioxidant compound (e.g., by spraying the antioxidant compound or by applying as a thin film coating), blended with or mixed with an antioxidant compound, or otherwise have an antioxidant compound present within it.
The entire teachings of each of the following applications are incorporated herein by reference:
Docket No.: 3805.1000-000; Provisional Patent Application No.: 60/632,893, filed December 3, 2004, Title: Process For The Synthesis Of Polyalkylphenol
Antioxidants, by Suizhou Yang, et al;
Docket No.: 3805.1000-003; Patent Application No.: 11/292,813, filed December 2, 2005, Title: Process For The Synthesis Of Polyalkylphenol Antioxidants, by Shuzhou Yang, et al; Docket No.: 3805.1001-000; Provisional Patent Application No.: 60/633,197, filed December 3, 2004, Title: Synthesis Of Sterically Hindered Phenol Based Macromolecular Antioxidants, by Ashish Dhawan, et al.;
Docket No.: 3805.1001-003; Patent Application No.: 11/293,050, filed December 2, 2005, Title: Synthesis Of Sterically Hindered Phenol Based Macromolecular Antioxidants, by Ashish Dhawan, et al.;
Docket No.: 3805.1002-000; Provisional Patent Application No.: 60/633,252, filed December 3, 2004, Title: One Pot Process For Making Polymeric Antioxidants, by Vijayendra Kumar, et al.;
Docket No.: 3805.1002-003; Patent Application No.: 11/293,049, filed December 2, 2005, Title: One Pot Process For Making Polymeric Antioxidants, by
Vijayendra Kumar, et al.;
Docket No.: 3805.1003-000; Provisional Patent Application No.: 60/633,196, filed December 3, 2004, Title: Synthesis Of Aniline And Phenol-Based Macromonomers And Corresponding Polymers, by Rajesh Kumar, et al.;
_ ^ _
Docket No.: 3805.1003-003; Patent Application No.: 11/293,844, filed December 2, 2005, Title: Synthesis Of Aniline And Phenol-Based Macromonomers And Corresponding Polymers, by Rajesh Kumar, et al.;
Docket No.: 3805.1004-000; Provisional Patent Application No.: 60/590,575, filed July 23, 2006, Title: Anti-Oxidant Macromonomers And Polymers And Methods
Of Making And Using The Same, by Ashok L. Cholli;
Docket No.: 3805.1004-001; Provisional Patent Application No.: 60/590,646, filed
July 23, 2006, Title: Anti-Oxidant Macromonomers And Polymers And Methods
Of Making And Using The Same, by Ashok L. Cholli; Docket No.: 3805.1004-002; Patent Application No.: 11/184,724, filed July 19,
2005, Title: Anti-Oxidant Macromonomers And Polymers And Methods Of Making And Using The Same, by Ashok L. Cholli;
Docket No.: 3805.1004-005; Patent Application No. 11/184,716, filed July 19, 2005,
Title: Anti-Oxidant Macromonomers And Polymers And Methods Of Making And Using The Same, by Ashok L. Cholli;
Docket No.: 3805.1005-000; Provisional Patent Application No.: 60/655,169, filed February 22, 2005, Title: Nitrogen And Hindered Phenol Containing Dual Functional Macromolecules: Synthesis And Their Antioxidant Performances In Organic Materials, by Rajesh Kumar, et al. Docket No.: 3805.1005-003; Patent Application No.: 11/360,020, filed February 22,
2006, Title: Nitrogen And Hindered Phenol Containing Dual Functional Macromolecules: Synthesis, Performances And Applications, by Rajesh
Kumar, et al.
Docket No.: 3805.1006-000; Provisional Patent Application No.: 604.69, 63ξ filed March 25, 2005, Title: Alkylated Macromolecular Antioxidants And
Methods Of Making, And Using The Same, by Rajesh Kumar, et al.
Docket No.: 3805.1006-001; Patent Application No.: 11/389,564, filed March 24, 2006, Title: Alkylated Macromolecular Antioxidants And Methods Of Making, And Using The Same, by Rajesh Kumar, et al.
Docket No.: 3805.1007-000; Provisional Patent Application No.: 60/731,125, filed October 27, 2005, Title: Macromolecular Antioxidants And Polymeric Macromoleciilar Antioxidants, by Ashok L. Cholli, et al.
Docket No.: 3805.1007-001; Patent Application, filed October 27, 2006, Title: Macromolecular Antioxidants And Polymeric Macromolecular Antioxidants, by Ashok L. Cholli, et al.
Docket No.: 3805.1009-000; Provisional Patent Application No.: 60/742,150, filed
December 2, 2005, Title: Lubricant Oil Composition, by Ashok L. Cholli, et al. Docket No.: 3805.1010-000; Provisional Patent Application No.: 60/731,325, filed
October 27, 2005, Title: Stabilized Polyolefin Composition, by Vijayendra
Kumar, et al. Docket No.: 3805.1010-001; Patent Application, filed October 27, 2006, Title:
Stabilized Polyolefin Composition, by Vijayendra Kumar, et al. Docket No.: 3805.1011-000; Provisional Patent Application No.: 60/818,876 , filed July 6, 2006, Title: Novel Macromolecular Antioxidants Comprising Differing
Antioxidant Moieties Structures Methods of Making and Using the Same, by
Ashok L. Cholli, et al.
Docket No.: 0813.2006-003; Patent Application No.: 11/040,193, filed January 21 2005, Title: Post-Coupling Synthetic Approach For Polymeric Antioxidants, by Ashok L. Choll, et al.;
Docket No.: 0813.2006-002; Patent Application No.: PCT/US2005/001948, filed January 21, 2005, Title: Post-Coupling Synthetic Approach For Polymeric Antioxidants, by Ashok L. Cholli et al.; Docket No.: 0813.2002-008; Patent Application No.: PCT/US2005/001946, filed January 21 2005, Title: Polymeric Antioxidants, by Ashok L. Choll, et al.;
Docket No.: 0813.2002-00:3; Patent Application No.: PCT/US03/10782, filed April 4, 2003, Title: Polymeric Antioxidants, by Ashok L. Choll, et al.;
Docket No.: 0813.2002-004; Patent Application No.: 10/761,933, filed January 21, 2004, Title: Polymeric Antioxidants, by Ashish Dhawan, et al.;
Docket No.: 0813.2002-001; Patent Application No.: 10/408,679, filed April 4, 2003, Title: Polymeric Antioxidants, by Ashok L. Choll, et al.;
In another particular embodiment, the present invention relates to a process for preparing compounds of the present invention. Compounds of the present invention can be prepared by a one pot process, comprising the step of combining a phenol containing compound with a suitable phosphorous containing compound in a suitable solvent under conditions suitable for the reaction of the phenol containing compound with the phosphorous containing compound.
Suitable phenol containing compounds include:
Suitable solvents are those which do not contain any acidic protons and dissolve the starting material and the side products, but do' not dissolve the end product. Examples of suitable solvents include, for example, dichloromethane, toluene, tetrahydrofuran, dichloromethane, chloroform, dioxane and acetonitrile. In certain embodiments, the reaction of the phenol containing compound with the phosphorous containing compound occurs at 25 0C. In other embodiments,
the reaction of the phenol containing compound with the phosphorous containing compound occurs below 25 0C. In other embodiments, the reaction of the phenol containing compound with the phosphorous containing compound occurs at a temperature between 25 0C and 0 0C. In other embodiments, the reaction of the phenol containing compound with the phosphorous containing compound occurs at a temperature between 15 0C and 00C. In other embodiments, the reaction of the phenol containing compound with the phosphorous containing compound occurs at a temperature between 5 0C and 0 0C. In other embodiments, the reaction of the phenol containing compound with the phosphorous containing compound occurs at O 0C.
In certain embodiment, the reaction of the phenol containing compound with the phosphorous containing compound takes place under a nitrogen atmosphere.
In certain embodiments the reaction takes place over 5 hours. In certain other embodiment the reaction takes place in less than 5 hours. In certain other embodiments the reaction takes place in one hour. In certain other embodiment the reaction takes place in less than one hour. In certain other embodiments the reaction takes place for a period of 30 to 40 minutes.
In certain embodiment after completion of the reaction the suitable solvent is removed by distillation In certain other embodiments after the suitable solvent is distilled off, the compound of the present invention are purified via crystallization using techniques known in the art.
In certain embodiments, after crystallization, the crystals are further filtered and washed using techniques known in the art. Scheme 1 is a representative example of the synthesis of a compound of the present invention.
Scheme 1, shows the synthesis of a sterically hindered phenol and phosphite based compound of structural formula I.
The macromolecular antioxidant S was synthesized by one pot reaction of phenol with phosphorous trichloride using dichloromethane as a solvent at 0 °C. The yield of the title compound was more than 95%.
Scheme 2, shows the synthesis of a sterically hindered phenol and phosphite based compound of structural formula II.
Scheme 3, shows the synthesis of a sterically hindered phenol and phosphite based compound of structural formula III.
The following is an example of one embodiment of the invention and is not to be considered limiting in any way. In one embodiment the sterically hindered phenol and phosphate based antioxidant is:
EXEMPLIFICATION
Example 1: Preparation of tris [N-(4-hydroxyphenyl),-3-(2,6-di-tert.-butyl, 4- hydroxyphenyl) propionamide] phosphite, S.
^
- 26 -
A lL two-necked round bottom flask equipped with a thermometer, a dropping funnel and a nitrogen inlet was charged with lOOg (0.271 mole) of N-(4- hydroxyphenyl)-3-(2,6-di-tert-butyl, 4-hydroxy phenyl) propionamide, 22 ml (0.271 mole) pyridine in 200 ml of dichloromethane. 7.86 ml(9.033 mmol) of phosphorous trichloride was then added dropwise at a temperature of 0 to 5 0C under nitrogen atmosphere for a period of 30 to 40 minutes. After the addition, the funnel was removed and completion of the reaction was checked by TLC/HPLC. After completion, the dichloromethane was distilled out at 40 0C. To the residue was added 100 ml of methanol to get white crystalline precipitate, which was then filtered and washed several times with cold methanol. The product was characterized by spectroscopic techniques. The melting point is in the range of 224- 245 0C
Example 2, Stabilization of polypropylene by tris [N-(4-hydroxyphenyl),-3-(2,6-di- tert.-butyl, 4-hydroxyphenyl) propionamide] phosphite S.
1000 ppm of S was added to unstabilized polypropylene powder and extruded with single screw extruder in the form wires which was then palletized using a pelletizer. The pelltized sample of polypropylene was subjected to an accelerated oxidative stability test using differential scanning calorimetry (DSC) (ASTM D3895 method).
The results are shown in FIG 1, which shows that tris [N-(4- hydroxyphenyl),-3-(2,6-di-tert.-butyl, 4-hydroxyphenyl) propionamide] phosphite has a significantly higher oxidative induction time than commercially available
T Irganox ® . While this invention has been particularly shown and described with references to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims.
Claims
What is claimed is: 1. A compound represented by a structural formula selected from I-HI:
R is:
Ri and R2 in each occurrence, independently is an optionally substituted alkyl, optionally substituted aryl or optionally substituted aralkyl; o o
- Zo -
X and Y in each occurrence, independently is a bond, -O-, - NH-, -C(O)NH-, -NHC(O)-, -C(O)O-, -OC(O)- or -CH2-; n and m in each occurrence, independently is O or a positive integer. i and j in each occurrence, independently is O, 1, 2, 3 or 4; and
R" is an optionally substituted alkyl.
2. The compound of Claim 1, wherein the compound is represented by structural formula I.
3. The compound of Claim 2, wherein:
R is:
O to 12.
4. The compound of Claim 3, wherein: Ri and R2 in each occurrence, independently is an optionally substituted alkyl; and i and j in each occurrence, independently is 0, 1 or 2.
5. The compound of Claim 4, wherein R is:
O to 6.
6. The compound of Claim 5, wherein:
X and Y in each occurrence, independently is a bond or -CH2-
7. The compound of Claim 5, wherein:
X and Y in each occurrence, independently is a bond, -O- or - CH2-.
8. The compound of Claim 5, wherein:
X and Y in each occurrence, independently is a bond, -NH- or -CH2-. _ 3Q _
9. The compound of Claim 5, wherein:
X and Y in each occurrence, independently is a bond, - C(O)NH- or -CH2-.
10. The compound of Claim 5, wherein:
X and Y in each occurrence, independently is a bond, - NHC(O)-, or -CH2-.
11. The compound of Claim 5, wherein:
X and Y in each occurrence, independently is a bond, - C(O)O- or -CH2-.
12. The compound of Claim 5, wherein: X and Y in each occurrence, independently is a bond,
-OC(O)- or -CH2-.
13. The compound of Claim 1, wherein the compound is represented by structural formula II.
14. The compound of Claim 13, wherein:
R is:
0 to 12.
15 The compound of Claim 14, wherein:
Ri and R2 in each occurrence, independently is an optionally substituted alkyl; and i and j in each occurrence, independently is 0, 1 or 2.
16. The compound of Claim 15, wherein R is:
wherein: n and m in each occurrence, independently is an integer from
O to 6.
17. The compound of Claim 16, wherein:
X and Y in each occurrence, independently is a bond or -CH2-
18. The compound of Claim 16, wherein:
X and Y in each occurrence, independently is a bond, -O- or - CH2-.
19. The compound of Claim 16, wherein:
X and Y in each occurrence, independently is a bond, -NH- or -CH2-.
20. The compound of Claim 16, wherein:
X and Y in each occurrence, independently is a bond, - C(O)NH- or -CH2-. _ ^ _
21. The compound of Claim 16, wherein:
X and Y in each occurrence, independently is a bond, - NHC(O)-, or -CH2-.
22. The compound of Claim 16, wherein:
X and Y in each occurrence, independently is a bond, - C(O)O- or -CH2-.
23. The compound of Claim 16, wherein:
X and Y are independently a bond, -OC(O)- or -CH2-.
24. The compound of Claim 1, wherein the compound is represented by structural formula III.
25. The compound of Claim 24, wherein:
R is:
26. The compound of Claim 25, wherein:
R1 and R2 in each occurrence, independently is an optionally substituted alkyl; and i and j in each occurrence, independently is 0, 1 or 2.
27. The compound of Claim 26, wherein
R
O to 6.
28. The compound of Claim 27, wherein: X and Y in each occurrence, independently is a bond or -CH2-
29. The compound of Claim 27, wherein:
X and Y in each occurrence, independently is a bond, -O- or CH2-.
30. The compound of Claim 27, wherein:
X and Y in each occurrence, independently is a bond, -NH- or -CH2-.
31. The compound of Claim 27, wherein:
X and Y in each occurrence, independently is a bond, - C(O)NH- or -CH2-.
32. The compound of Claim 27, wherein: X and Y in each occurrence, independently is a bond, -
NHC(O)-, or -CH2-.
33. The compound of Claim 27, wherein:
X and Y in each occurrence, independently is a bond, - C(O)O- Or -CH2-.
34. The compound of Claim 27, wherein:
X and Y in each occurrence, independently is a bond, -OC(O)- or -CH2-.
35. A method of preventing oxidation comprising combining an oxidizable material with a compound represented by a structural formula selected from I-ΪII:
III wherein:
Ri and R2 in each occurrence, independently is an optionally substituted alkyl or optionally substituted aryl;
X and Y in each occurrence, independently is a bond, -O-, - NH-, -C(O)NH-, -NHC(O)-, -C(O)O-, -OC(O)- or -CH2-; n and m in each occurrence, independently is O or a positive integer. i and j in each occurrence, independently is O, 1, 2, 3 or 4; and R" is an optionally substituted alkyl.
36. The method of Claim 35, wherein the compound is represented by structural formula I.
37. The method of Claim 36, wherein:
R is:
0 to 12.
38. The method of Claim 37, wherein:
Ri and R2 in each occurrence, independently is an optionally substituted alkyl; and i and j in each occurrence, independently is 0, 1 or 2.
39. The method of Claim 38, wherein R is:
40. The method of Claim 39, wherein:
X and Y in each occurrence, independently is a bond or -CH2-
41. The method of Claim 39, wherein :
X and Y in each occurrence, independently is a bond, -O- or - CH2-.
42. The method of Claim 39, wherein:
X and Y in each occurrence, independently is a bond, -NH- or -CH2-.
43. The method of Claim 39, wherein:
X and Y in each occurrence, independently is a bond, - C(O)NH- or -CH2-. ^ _
44. The method of Claim 39, wherein:
X and Y in each occurrence, independently is a bond, - NHC(O)-, or -CH2-.
45. The method of Claim 39, wherein:
X and Y in each occurrence, independently is a bond, - C(O)O- or -CH2-.
46. The method of Claim 39, wherein: X and Y in each occurrence, independently is a bond,
-OC(O)- or -CH2-.
47. The method of Claim 35, wherein the compound is represented by structural formula II.
48. The method of Claim 47, wherein:
R is:
49. The method of Claim 48, wherein:
Ri and R2 in each occurrence, independently is an optionally substituted alkyl; and i and j in each occurrence, independently is 0, 1 or 2.
50. The method of Claim 49, wherein R is:
51. The method of Claim 50, wherein:
X and Y in each occurrence, independently is a bond or -CH2-
52. The method of Claim 50, wherein:
X and Y in each occurrence, independently is a bond, -O- or CH2-.
53. The method of Claim 50, wherein: X and Y in each occurrence, independently is a bond, -NH- or -CH2-.
54. The method of Claim 50, wherein: X and Y in each occurrence, independently is a bond, -
C(O)NH- or -CH2-.
55. The method of Claim 50, wherein:
X and Y in each occurrence, independently is a bond, - NHC(OH Or -CH2-.
56. The method of Claim 50, wherein:
X and Y in each occurrence, independently is a bond, - C(O)O- or -CH2-.
57. The method of Claim 50, wherein:
X and Y in each occurrence, independently is a bond, -OC(O)- or -CH2-.
58. The method of Claim 35, wherein the compound is represented by structural formula III.
59. The method of Claim 58, wherein: R is:
0 to 12.
60. The method of Claim 59, wherein:
Ri and R2 in each occurrence, independently is an optionally substituted alkyl; and i and j in each occurrence, independently is 0, 1 or 2.
61. The method of Claim 60, wherein R is:
62. The method of Claim 61 , wherein :
X and Y in each occurrence, independently is a bond or -CH2-
63. The method of Claim 61 , wherein:
X and Y in each occurrence, independently is a bond, -O- or - CH2-.
64. The method of Claim 61 , wherein:
X and Y in each occurrence, independently is a bond, -NH- or -CH2-.
65. The method of Claim 61 , wherein:
X and Y in each occurrence, independently is a bond, - C(O)NH- or -CH2-. W 2
- 44 -
66. The method of Claim 61, wherein:
X and Y in each occurrence, independently is a bond, NHC(O)-, or -CH2-.
67. The method of Claim 61, wherein:
X and Y in each occurrence, independently is a bond, C(O)O- or -CH2-.
68. The method of Claim 61, wherein:
10 X and Y in each occurrence, independently is a bond, -OC(O)- or -CH2-.
69. A method of synthesizing a macromonomer represented by a structural formula selected from I-III:
15
III wherein:
R is: 
Ri and R2 in each occurrence, independently is an optionally substituted alkyl or optionally substituted aryl;
X and Y in each occurrence, independently is a bond, -O-, - NH-, -C(O)NH-, -NHC(O)-, -C(O)O-, -OC(O)- or -CH2-; n and m in each occurrence, independently is O or a positive integer; i and j in each occurrence, independently is O, 1, 2, 3 or 4; and
R" is an optionally substituted alkyl; comprising the step of mixing R+"1" with a phosphorous containing compound, wherein R+* is:
70. The method of Claim 69, wherein the compound is represented by structural formula I.
71. The method of Claim 70, wherein the phosphorous containing compound is phosphorous trichloride.
72. The method of Claim 71, wherein the solvent includes dichloromethane.
73. The method of Claim 72, wherein R+"1" and the phosphorous containing compound are mixed at a temperature in a range of between about 5 0C and about -5 0C.
74. The method of Claim 73, wherein R++ and the phosphorous containing compound are mixed at a temperature of about 0 0C.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US73102105P | 2005-10-27 | 2005-10-27 | |
| US60/731,021 | 2005-10-27 |
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| Publication Number | Publication Date |
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| WO2007050985A2 true WO2007050985A2 (en) | 2007-05-03 |
| WO2007050985A3 WO2007050985A3 (en) | 2007-06-14 |
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ID=37896022
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/US2006/042235 WO2007050985A2 (en) | 2005-10-27 | 2006-10-27 | Macromolecular antioxidants based on stξrically hindered phenolic phosphites |
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| US (1) | US7705176B2 (en) |
| WO (1) | WO2007050985A2 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| US7705176B2 (en) | 2010-04-27 |
| WO2007050985A3 (en) | 2007-06-14 |
| US20070135539A1 (en) | 2007-06-14 |
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