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US3767641A
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Process for preparing allylic rearrangement compounds of antibiotics sf-837 and sf-837a2
Assignee: Meiji Seika Kaisha Ltd
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Filing: 1971-10-27
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Granted: 1973-10-23
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Expires: 1991-10-27
Abstract
Abstract THE ALLYLIC REARRANGEMENT PRODUCTS OF ANTIBIOTICS SF-837 AND SF-837A2 ARE OBTAINED BY AN ACID CATALYZED REACTION WHEREIN AN OH GROUP IS SHIFTED FROM THE 9 TO THE 13 POSITION IN AQUEOUS SOLUTION.
Inventors
- 👤 T Tsuruoka
- 👤 S Fukatsu
- 👤 T Niida
- 👤 B Nomiya
- 👤 S Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:47
CPC Classifications
C; C07; C07H; C07H17/00; C07H17/04; C07H17/08
Claims Analysis
Total Claims: 0
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |