US4874894A
Expired / Lapsed
US
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Process for the production of benzenesulfonamides
Assignee: HILTON-DAVIS COMPANY A CORP OF DE
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Filing: 1987-04-29
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Granted: 1989-10-17
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Expires: 2007-04-29
Abstract
Abstract Process comprises the combination of two steps of interacting a R-benzene, sulfuric acid and phosphorus oxychloride to obtain 4-R-benzenesulfonyl chloride and amidating said sulfonyl chloride to produce 4-R-benzenesulfonamide.
Inventors
- 👤 Ramamurthi Kannan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:52
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/36; C07C303/38; C09; C09D; C09D11/00; C09D11/30; C09D11/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A process for the production of a 4-R-benzenesulfonamide of the formula ##STR4## wherein R represents a non-tertiary C 1 to C 16 alkyl or a non-tertiary C 1 to C 16 alkoxy, which consists of in the first step reacting a R-benzene with sulfuric acid and phosphorus oxychloride to produce a 4-R-benzenesulfonyl chloride of the formula ##STR5## and in a second step amidating said 4-R-benzenesulfonyl chloride with ammonia in an aqueous medium to obtain said 4-R-benzenesulfonamide.
Claim 2
Dependent Claim
76 words
A process for the production of a 4-R-benzenesulfonamide of the formula ##STR4## wherein R represents a non-tertiary C 1 to C 16 alkyl or a non-tertiary C 1 to C 16 alkoxy, which consists of in the first step reacting a R-benzene with sulfuric acid and phosphorus oxychloride to produce a 4-R-benzenesulfonyl chloride of the formula ##STR5## and in a second step amidating said 4-R-benzenesulfonyl chloride with ammonia in an aqueous medium to obtain said 4-R-benzenesulfonamide.
Claim 3
Dependent Claim
21 words
A process according to claim 1 for preparing a 4-R-benzenesulfonamide wherein R represents a non-tertiary C 1 to C 16 alkoxy.
Claim 4
Dependent Claim
9 words
A process according to claim 2 for preparing 4-methoxybenzenesulfonamide.
Claim 5
Dependent Claim
21 words
A process according to claim 1 for preparing a 4-R-benzensulfonamide wherein R represents a non-tertiary C 1 to C 16 alkyl.
Claim 6
Dependent Claim
9 words
A process according to claim 4 for preparing 4-ethylbenzenesulfonamide.
Claim 7
Dependent Claim
9 words
A process according to claim 4 for preparing 4-butylbenzenesulfonamide.
Claim 8
Dependent Claim
9 words
A process according to claim 4 for preparing 4-nonylbenzenesulfonamide.
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) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |