Patent US2825735A successfully refreshed from Google Patents.
US2825735A
Expired / Lapsed
US
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Pregnane and allopregnane-11alpha, 21-diol-3, 20-diones and process
Assignee: Syntex SA
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Filing: 1953-02-06
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Granted: 1958-03-04
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Expires: 1973-02-06
Abstract
No abstract record available.
Inventors
- 👤 Rosenkranz George
- 👤 Djerassi Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:49
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCESS FOR THE PRODUCTION OF 21-MONO ESTERS SELECTED FROM THE CLASS CONSISTING OF LOWER FATTY ACID ESTERS AND BENZOIC ACID ESTERS OF A PREGNAN-11A,21-DIOL3,20-DIONE COMPOUND WHICH COMPRISES TREATING AN 11A,21DIESTER SELECTED FROM THE CLASS CONSISTING OF LOWER FATTY ACID ESTERS AND BENZOIC ACID ESTERS OF A PREGNAN-3,11A,21TRIOL-20-ONE COMPOUND WITH AN OXIDIZING AGENT TO FORM THE CORRESPONDING 3-KETO COMPOUND, TREATING THE 3-KETO COMPOUND WITH A SAPONIFYING AGENT TO FORM THE CORRESPONDING PREGNAN-11A,21-DIOL-3,20-DIONE COMPOUND AND TREATING SAID LAST MENTIONED COMPOUND WITH APPROXIMATELY 1 MOL OF AN ACYLATING AGENT LOWER FATTY ACID ANHYDRIDES AND BENZOIC ACID ANHYDRIDE TO SELECTIVELY FORM THE AFOREMENTIONED 21-MONO ESTER.
Claim 2
Dependent Claim
102 words
A PROCESS FOR THE PRODUCTION OF 21-MONO ESTERS SELECTED FROM THE CLASS CONSISTING OF LOWER FATTY ACID ESTERS AND BENZOIC ACID ESTERS OF A PREGNAN-11A,21-DIOL3,20-DIONE COMPOUND WHICH COMPRISES TREATING AN 11A,21DIESTER SELECTED FROM THE CLASS CONSISTING OF LOWER FATTY ACID ESTERS AND BENZOIC ACID ESTERS OF A PREGNAN-3,11A,21TRIOL-20-ONE COMPOUND WITH AN OXIDIZING AGENT TO FORM THE CORRESPONDING 3-KETO COMPOUND, TREATING THE 3-KETO COMPOUND WITH A SAPONIFYING AGENT TO FORM THE CORRESPONDING PREGNAN-11A,21-DIOL-3,20-DIONE COMPOUND AND TREATING SAID LAST MENTIONED COMPOUND WITH APPROXIMATELY 1 MOL OF AN ACYLATING AGENT LOWER FATTY ACID ANHYDRIDES AND BENZOIC ACID ANHYDRIDE TO SELECTIVELY FORM THE AFOREMENTIONED 21-MONO ESTER.
References Cited (Backward Citations)
GB594878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |