US3983151A
Expired / Lapsed
US
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Process for the preparation of 4-hydroxy-3-methoxy-phenylacetonitrile
Assignee: Bayer AG
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Filing: 1975-11-21
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Granted: 1976-09-28
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Expires: 1995-11-21
Abstract
Abstract 3-Methoxy-4-hydroxyphenylacetonitrile, which is a known chemical intermediate, is obtained from the reaction of an N-(lower alkyl) 3-methoxy-4-hydroxybenzylamine with hydrogen cyanide.
Inventors
- 👤 Horst Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:25
CPC Classifications
C; C07; C07C; C07C255/00; C07C255/49; C07C255/53
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
32 words
The process for the preparation of 3-methoxy-4-hydroxyphenylacetonitrile which comprises allowing an N-(lower alkyl)-3-methoxy-4-hydroxybenzylamine to react with hydrogen cyanide in a diluent at temperatures of from about 100° C to about 190° C.
Claim 2
Dependent Claim
32 words
The process for the preparation of 3-methoxy-4-hydroxyphenylacetonitrile which comprises allowing an N-(lower alkyl)-3-methoxy-4-hydroxybenzylamine to react with hydrogen cyanide in a diluent at temperatures of from about 100° C to about 190° C.
Claim 3
Dependent Claim
18 words
The process according to claim 1 wherein the temperature is from about 110° C to about 140° C.
Claim 4
Dependent Claim
14 words
The process according to claim 1 wherein the hydrogen cyanide is generated in situ.
Claim 5
Dependent Claim
11 words
The process according to claim 1 wherein the diluent is water.
Claim 6
Dependent Claim
14 words
The process according to claim 1 wherein the diluent is an inert organic solvent.
Claim 7
Dependent Claim
10 words
The process according to claim 1 wherein N-methyl-3-methoxy-4-hydroxybenzylamine is employed.
Claim 8
Dependent Claim
31 words
The process according to claim 1 wherein N-methyl-3-methoxy-4-hydroxybenzylamine is allowed to react with hydrogen cyanide in an inert organic solvent at temperatures of from about 110° C to about 140° C.
Claim 9
Dependent Claim
25 words
The process according to claim 7 wherein the hydrogen cyanide is generated in situ from the reaction of an alkali metal cyanide and an acid.
Claim 10
Dependent Claim
16 words
The process according to claim 7 wherein the inert organic solvent is a polar aprotic solvent.
Claim 11
Dependent Claim
11 words
The process according to claim 9 wherein the solvent is dimethylsulfoxide.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |