US3879402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing 2-chloro-5-sulfamoylbenzoic acids
Assignee: Pfizer Inc
•
Filing: 1973-09-26
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Granted: 1975-04-22
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Expires: 1993-09-26
Abstract
Abstract A process for the synthesis of 2-chloro-5-sulfamoylbenzoic acids by diazotization of the requisite 2-amino-5-sulfamoylbenzoic acid followed by treatment of the resulting diazonium salt with a metal chloride at 60*-100* C., said products being useful hypolipidemic agents.
Inventors
- 👤 Gerald F Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:57
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/22; C07D211/00; C07D211/92; C07D211/96
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
10 words
A PROCESS FOR THE PREPARATION OF COMPOUNDS OF THE FORMULA:
Claim 2
Dependent Claim
10 words
A PROCESS FOR THE PREPARATION OF COMPOUNDS OF THE FORMULA:
Claim 3
Dependent Claim
10 words
A process for the preparation of compounds of the formula:
Claim 4
Dependent Claim
10 words
A process for the preparation of compounds of the formula:
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the metal chloride is CuCl2, the reaction-inert solvent is water and the reaction temperature is 70*-80* C.
Claim 6
Dependent Claim
15 words
The process of claim 2 wherein R1 is ethyl and R2 is of the formula
References Cited (Backward Citations)
BE729430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |