US2647134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective reduction of 3-keto group of polyketosteroids
Assignee: Pharmacia and Upjohn Co
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Filing: 1951-08-31
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Granted: 1953-07-28
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Expires: 1971-08-31
Abstract
No abstract record available.
Inventors
- 👤 John A Hogg
- 👤 Douglas A Lyttle
- 👤 Alan H Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:34
CPC Classifications
C; C07; C07J; C07J7/00; C07J15/00; C07J3/00; C07J5/00; C07J75/00; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/939
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD FOR THE CONVERSION OF A 3,20-DIKETOPREGNANE TO A 3-HYDROXY-20-KETOPREGNANE COMPRISING CONTACTING IN SOLUTION A 3,20-DIKETOPREGNANE WITH ABOUT 1-4 EQUIVALENTS OF A METAL BOROHYDRIDE AT TEMPERATURES FROM ABOUT ZERO DEGREES CENTIGRADE TO ABOUT 100 DEGREES CENTIGRADE FOR A PERIOD OF ABOUT TWO MINUTES TO ABOUT TWO HOURS, THE TEMPERATURE AND DURATION OF THE REACTION VARYING INVERSELY WITH THE NUMBER OF EQUIVALENTS OF METAL BOROHYDRIDE, WHEREBY THE 3-KETO GROUP IS SELECTIVELY REDUCED TO A HYDROXYL GROUP, AND ISOLATING A 3-HYDROXY-20-KETOPREGNANE FROM THE REACTION MIXTURE.
Claim 2
Independent Claim
84 words
A METHOD FOR THE CONVERSION OF A 3,20-DIKETOPREGNANE TO A 3-HYDROXY-20-KETOPREGNANE COMPRISING CONTACTING IN SOLUTION A 3,20-DIKETOPREGNANE WITH ABOUT 1-4 EQUIVALENTS OF A METAL BOROHYDRIDE AT TEMPERATURES FROM ABOUT ZERO DEGREES CENTIGRADE TO ABOUT 100 DEGREES CENTIGRADE FOR A PERIOD OF ABOUT TWO MINUTES TO ABOUT TWO HOURS, THE TEMPERATURE AND DURATION OF THE REACTION VARYING INVERSELY WITH THE NUMBER OF EQUIVALENTS OF METAL BOROHYDRIDE, WHEREBY THE 3-KETO GROUP IS SELECTIVELY REDUCED TO A HYDROXYL GROUP, AND ISOLATING A 3-HYDROXY-20-KETOPREGNANE FROM THE REACTION MIXTURE.
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) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |