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Patent US3895037A successfully refreshed from Google Patents.
US3895037A
Expired / Lapsed
US
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Process for preparing a diphenyl carbinol carboxylic anhydride
Assignee: Gulf Research and Development Co
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Filing: 1974-05-01
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Granted: 1975-07-15
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Expires: 1994-05-01
Abstract
Abstract A process for converting a diaryl ketone carboxylic anhydride to the corresponding diaryl carbinol carboxylic anhydride which involves subjecting a diaryl ketone carboxylic anhydride to hydrogenation in an ester carrier in which it is soluble.
Inventors
- 👤 Anatoli Onopchenko
- 👤 Johann G D Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:27
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/567
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
53 words
A PROCESS FOR CONVERTING A BENZOPHENONE CARBOXYLIC ANHYDRIDE TO THE CORRESPONDING DIPHENYL CARBINOL CARBOXYLIC ANHYDRIDE WHICH COMPRISES SUBJECTING SAID BENZOPHENONE CARBOXYLIC ANHYDRIDE TO HYDROGENATION WITH HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATALYST WHILE SAID BENZOPHENONE CARBOXYLIC ANHYDRIDE IS DISSOLVED IN A LIQUID CARBOXYLIC ACID ESTER HAVING FROM TWO TO 12 CARBON ATOMS.
Claim 2
Dependent Claim
53 words
A PROCESS FOR CONVERTING A BENZOPHENONE CARBOXYLIC ANHYDRIDE TO THE CORRESPONDING DIPHENYL CARBINOL CARBOXYLIC ANHYDRIDE WHICH COMPRISES SUBJECTING SAID BENZOPHENONE CARBOXYLIC ANHYDRIDE TO HYDROGENATION WITH HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATALYST WHILE SAID BENZOPHENONE CARBOXYLIC ANHYDRIDE IS DISSOLVED IN A LIQUID CARBOXYLIC ACID ESTER HAVING FROM TWO TO 12 CARBON ATOMS.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said ester has from three to eight carbon atoms.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein said ester is an alkyl ester.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein said ester is an aryl ester.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein said benzophenone carboxylic dianhydride is 3,4,3'',4'' -benzophenone tetracarboxylic dianhydride.
Claim 7
Dependent Claim
35 words
The process of claim 1 wherein the reaction is carried out at a temperature of about 100* to about 150* C. under a hydrogen pressure of at least about 100 pounds per square inch gauge.
Claim 8
Dependent Claim
36 words
The process of claim 1 wherein the reaction is carried out at a temperature of about 125* to about 140* C. and a hydrogen pressure of about 500 to about 1,500 pounds per square inch gauge.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein said ester is methyl acetate.
Claim 10
Dependent Claim
11 words
The process of claim 1 wherein said ester is ethyl acetate.
Claim 11
Dependent Claim
11 words
The process of claim 1 wherein said ester is amyl acetate.
Claim 12
Dependent Claim
11 words
The process of claim 1 wherein said ester is ethyl malonate.
Claim 13
Dependent Claim
22 words
The process of claim 1 wherein the weight ratio of ester to benzophenone carboxylic anhydride is from about 99:1 to about 2:
Claim 14
Dependent Claim
22 words
The process of claim 1 wherein the weight ratio of ester to benzophenone carboxylic anhydride is from about 95:5 to about 4:
Claim 15
Dependent Claim
21 words
The process of claim 1 wherein said hydrogenation catalyst is selected from the group consisting of nickel, cobalt and copper chromate.
Claim 16
Dependent Claim
11 words
The process of claim 1 wherein said hydrogenation catalyst is nickel.
Claim 17
Dependent Claim
24 words
The process of claim 1 wherein the hydrogenation catalyst amounts to at least about two weight per cent, based upon the benzophenone carboxylic anhydride.
Claim 18
Dependent Claim
25 words
The process of claim 1 wherein the hydrogenation catalyst amounts to about five to about 10 weight per cent, based upon the benzophenone carboxylic anhydride.
References Cited (Backward Citations)
US3293267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |