US3668197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esters and amides of (diazomethyl) phosphonic acid
Assignee: Merck and Co Inc
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Filing: 1969-07-22
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Granted: 1972-06-06
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Expires: 1989-07-22
Abstract
Abstract A method for the preparation of (cis-1,2-epoxypropyl)-phosphoric acid diesters and diamides which comprises treating the corresponding diester or diamide of (diazomethyl)-phosphonic acid with acetaldehyde or, alternatively, treating a mixture of an appropriate diester or diamide of formylphosphonic acid with diazoethane. The (cis-1,2-epoxypropyl) acid diesters and diamides thus obtained have utility as intermediates inasmuch as they may be converted to the pharmacologically active (cis-1,2epoxypropyl)phosphonic acid and to the salts thereof which inhibit the growth of gram-positive and gram-negative pathogenic bacteria.
Inventors
- 👤 Raymond A Firestone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:34
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/655; C07F9/65502; C07F9/65505; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A compound according to claim 1 of the formula: wherein R is lower alkoxy, polychloro-lower alkoxy, lower alkenyloxy, benzyloxy or phenethyloxy.
Claim 2
Dependent Claim
14 words
A compound according to claim 2 wherein R is methoxy, 2,2,2-trichloroethoxy, allyloxy or benzyloxy.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |