US3813407A
Expired / Lapsed
US
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Process for the preparation of 1-hydroxy-2-(1,1-difluoroalkyl)benzimidazoles and 1-hydroxy-2-(1,1-difluoroalkyl)-1h-imidazo(4,5-b)pyridines
Assignee: Eli Lilly and Co
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Filing: 1970-03-19
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Granted: 1974-05-28
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Expires: 1990-03-19
Abstract
Abstract THE PRESENT INVENTION IS DIRECTED TO A PROCESS FOR THE PREPARATION OF 1-HYDROXY-2-(1,1-DIFLUOROALKYL)BENZIMIDAZOLES AND 1-HYDROXY-2-(1,1-DIFLUOROALKYL)-H-IMIDAZO (4,5-B) PYRIDINES. THE PROCESS INVOLVES THE REDUCTION OF, RESPECTIVELY, CORRESPONDING 2-NITRO-1-(2,2-DIFLUOROALKANAMIDO)BENZENES AND 3-NITRO-2-(2,2-DIFLUOROALKANAMIDO) PYRIDINES, TO INTERMEDIATES WHICH UNDERGO A SPONTANEOUS CYCLODEHYDRATION TO YIELD THE ULTIMATE PRODUCTS. THE REDUCTION IS ACHIEVED IN GOOD YIELD BY THE USE, AS REDUCING AGENT, OF HYDROGEN IN THE PRESENCE OF A CATALYST, OR TIN, ZINC, OR IRON IN ACID OR NEUTRAL SOLUTION. ALL OF THE PRODUCTS ARE USEFUL AS HERBICIDES.
Inventors
- 👤 G Doherty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:15
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D235/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |