Patent US3859342A successfully refreshed from Google Patents.
US3859342A
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US
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Process for the preparation of p-aminomethylbenzoic acid
Assignee: Asahi Kasei Corp
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Filing: 1973-04-27
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Granted: 1975-01-07
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Expires: 1993-04-27
Abstract
Abstract Process for the preparation of p-aminomethylbenzoic acid from an alkyl ester of p-cyanobenzoic acid in one step in high yield. The process comprises reacting an alkyl ester of p-cyanobenzoic acid with hydrogen in the presence of a hydrogenation catalyst in an aqueous medium containing at least one alkaline reagent.
Inventors
- 👤 Hirokazu Fukumi
- 👤 Hirataka Itoh
- 👤 Koryo Itoh
- 👤 Yutaka Usubuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:19
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
21 words
A PROCESS FOR PREPARING P-AMINOMETHYLBENZOIC ACID IN ONE STEP WHICH COMPRISES REACTING AN ALKYL ESTER OF PCYANOBENZOIC ACID OF THE FORMULA,
Claim 2
Dependent Claim
21 words
A PROCESS FOR PREPARING P-AMINOMETHYLBENZOIC ACID IN ONE STEP WHICH COMPRISES REACTING AN ALKYL ESTER OF PCYANOBENZOIC ACID OF THE FORMULA,
Claim 3
Dependent Claim
33 words
A process according to claim 1 wherein said alkyl ester of p-cyanobenzoic acid is selected from the group of consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl esters of p-cyanobenzoic acid.
Claim 4
Dependent Claim
19 words
A process according to claim 2 wherein said alkyl ester of p-cyanobenzoic acid is methyl ester of p-cyanobenzoic acid.
Claim 5
Dependent Claim
17 words
A process according to claim 1 wherein the reaction temperature is from about 50*C. to about 150*C.
Claim 6
Dependent Claim
87 words
A process according to claim 1 wherein said alkaline reagent is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium oxide, sodium oxide, potassium oxide, lithium carbonate, sodium carbonate, potassium carbonate, magnesium hydroxide, calcium hydroxide, barium hydroxide, magnesium oxide, calcium oxide and barium oxide. 6.. A process according to claim 5 wherein the amount of said alkaline reagent is to provide from about 1 to about 2 gram equivalent of the metallic ion for each mole of the alkyl ester of p-cyanobenzoic acid.
Claim 7
Dependent Claim
12 words
A process according to claim 1 wherein said alkaline reagent is ammonia.
Claim 8
Dependent Claim
36 words
A process according to claim 7 wherein the amount of said ammonia is to provide from about 4 to about 15 gram equivalent of ammonia ion for each mole of the alkyl ester of p-cyanobenzoic acid.
Claim 9
Dependent Claim
18 words
A process according to claim 7 wherein said alkaline reagent is a mixture of ammonia and sodium hydroxide.
Claim 10
Dependent Claim
18 words
A process according to claim 7 wherein said alkaline reagent is a mixture of ammonia and potassium hydroxide.
Claim 11
Dependent Claim
32 words
A process according to claim 1 wherein said hydrogenation catalyst is selected from the group consisting of Raney nickel, Raney cobalt, ruthenium oxide, rhodium oxide, ruthenium metal, rhodium metal and reduced nickel.
Claim 12
Dependent Claim
31 words
A process according to claim 1 wHerein the amount of hydrogenation catalyst is from about 0.1 to about 50 weight percent based on the weight of alkyl ester of p-cyanobenzoic acid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |