Patent US4308407A successfully refreshed from Google Patents.
US4308407A
Expired / Lapsed
US
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Chemical process
Assignee: Albemarle Corp
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Filing: 1980-08-18
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Granted: 1981-12-29
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Expires: 2000-08-18
Abstract
Abstract Phenols with a methyl group substituted on the phenolic benzene ring, such as 2,6-di-tert-butyl-p-cresol, can be produced by reacting a halomethyl group substituted on a phenol such as 2,6-di-tert-butyl-4-chloromethylphenol, with hydrogen in the presence of a hydrogenation catalyst, such as palladium.
Inventors
- 👤 Bernard R. Meltsner
- 👤 Joseph D. Odenweller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:52
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/001; C07C37/002
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
49 words
A process for converting a halomethyl phenol to a cresol, said process comprising contacting said halomethyl phenol with hydrogen in the presence of a hydrogenation catalyst at a pressure of from atmospheric to about 3000 psig and at a temperature of from about 25° C. to about 300° C.
Claim 2
Dependent Claim
49 words
A process for converting a halomethyl phenol to a cresol, said process comprising contacting said halomethyl phenol with hydrogen in the presence of a hydrogenation catalyst at a pressure of from atmospheric to about 3000 psig and at a temperature of from about 25° C. to about 300° C.
Claim 3
Dependent Claim
13 words
A process of claim 1 wherein said halomethyl phenol is a chloromethyl phenol.
Claim 4
Dependent Claim
25 words
A process of claim 2 wherein said hydrogenation catalyst is selected from the group consisting of Group VIII metals, chromium and molybdenum and compounds thereof.
Claim 5
Dependent Claim
11 words
A process of claim 3 wherein said hydrogenation catalyst is palladium.
Claim 6
Dependent Claim
92 words
A process of claim 1 for making a dihydrocarbyl cresol by contacting a dihydrocarbyl chloromethyl phenol having the structure: ##STR2## wherein R' and R" are selected from the group consisting of alkyl containing 1 to 20 carbon atoms, cycloalkyl containing 5 to 8 carbon atoms, aralkyl containing 7 to 20 carbon atoms and aryl containing 6 to 20 carbon atoms, with hydrogen in the presence of a hydrogenation catalyst at a pressure of from atmospheric to about 3000 psig and at a temperature of from about 25° C. to about 300° C.
Claim 7
Dependent Claim
25 words
A process of claim 5 wherein said hydrogenation catalyst is selected from the group consisting of Group VIII metals, chromium and molybdenum and compounds thereof.
Claim 8
Dependent Claim
11 words
A process of claim 6 wherein said hydrogenation catalyst is palladium.
Claim 9
Dependent Claim
14 words
A process of claim 5 wherein said dihydrocarbyl chloromethyl phenol is a 2,6-di-alkyl-4-chloromethyl phenol.
Claim 10
Dependent Claim
25 words
A process of claim 8 wherein said hydrogenation catalyst is selected from the group consisting of Group VIII metals, chromium and molybdenum and compounds thereof.
Claim 11
Dependent Claim
11 words
A process of claim 9 wherein said hydrogenation catalyst is palladium.
Claim 12
Dependent Claim
12 words
A process of claim 8 wherein said 2,6-di-alkyl-4-chloromethyl phenol is 2,6-di-tert-butyl-4-chloromethyl phenol.
Claim 13
Dependent Claim
25 words
A process of claim 11 wherein said hydrogenation catalyst is selected from the group consisting of Group VIII metals, chromium and molybdenum and compounds thereof.
Claim 14
Dependent Claim
11 words
A process of claim 12 wherein said hydrogenation catalyst is palladium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |