US4263446A
Expired / Lapsed
US
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Process for making 3-(3,5-dialkyl-4-hydroxyphenyl)propionate esters of hydroxyalkyloxamides
Assignee: Uniroyal Chemical Co Inc
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Filing: 1979-05-30
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Granted: 1981-04-21
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Expires: 1999-05-30
Abstract
Abstract An improved method for making 3-(3,5-dialkyl-4-hydroxyphenyl)propionates of hydroxyalkyloxamides involved heating the hydroxyalkyloxamide with a lower alkyl ester of 3-(3,5-dialkyl-4-hydroxyphenyl)propionic acid in the presence of an alkanestannoic acid at a temperature of 150° to 230° C., the lower boiling alcohol being removed by distillation.
Inventors
- 👤 Edward L. Wheeler
- 👤 Elmar H. Jancis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:12
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
A process for making esters of the formula --CONHA--OCOR) n ] 2 , wherein R is a 2-(3,5-di-Z-4-hydroxyphenyl)ethyl radical, A is a C 2 to C 12 linear or branched hydrocarbyl radical of the valence n+1, n is an integer 1 to 3 and Z is a linear or branched C 1 to C 9 linear or branched alkyl, comprising heating a C 1 to C 4 alkyl ester of 3-(3,5-di-Z-4-hydroxyphenyl)propionic acid wherein Z is as defined above, with an alcohol of the formula [--CONHA--(OH) n ] 2 , wherein A and n are as defined above, in the presence of an linear or branched alkanestannonic acid at a temperature of from 150°-230° C., the lower boiling alcohol being removed by distillation.
Claim 2
Dependent Claim
122 words
A process for making esters of the formula --CONHA--OCOR) n ] 2 , wherein R is a 2-(3,5-di-Z-4-hydroxyphenyl)ethyl radical, A is a C 2 to C 12 linear or branched hydrocarbyl radical of the valence n+1, n is an integer 1 to 3 and Z is a linear or branched C 1 to C 9 linear or branched alkyl, comprising heating a C 1 to C 4 alkyl ester of 3-(3,5-di-Z-4-hydroxyphenyl)propionic acid wherein Z is as defined above, with an alcohol of the formula [--CONHA--(OH) n ] 2 , wherein A and n are as defined above, in the presence of an linear or branched alkanestannonic acid at a temperature of from 150°-230° C., the lower boiling alcohol being removed by distillation.
Claim 3
Dependent Claim
14 words
A process according to claim 1, wherein the 2-(3,5-di-alkyl-4-hydroxyphenyl)ethyl radical is the 2-(3,5-di-tert-butyl-4-hydroxyphenyl)ethyl radical.
Claim 4
Dependent Claim
14 words
A process according to claim 2, wherein n is 1 and A is ethylene.
Claim 5
Dependent Claim
17 words
A process according to any one of claims 1 to 3, wherein the catalyst is butanestannonic acid.
Claim 6
Dependent Claim
15 words
A process according to claim 1, wherein said temperature is from 165° to 195° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |