Patent US1358216A successfully refreshed from Google Patents.
Patent US3644380A successfully refreshed from Google Patents.
US3644380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 3-cyanopyridine
Assignee: Merck and Co Inc
•
Filing: 1969-11-24
•
Granted: 1972-02-22
•
Expires: 1989-11-24
Abstract
Abstract A PROCESS FOR PREPARING 3-CYANOPYRIDINE WHICH COMPRISES THE STEPS OF REACTING 2-METHYLENEGLUTARONITRILE WITH CHLORINE, BROMINE OR IODINE AND REACTING SAID 2-HALO-2HALOMETHYLGLUTARONITRILE WITH A LEWIS ACID PRODUCING THE INTERMEDIATE COMPOUND, 3-HALO-DIHYDRO-3-CYANO-PYRIDINE WHEREIN THE LATTER COMPOUND UNDERGOES DEHYDRO-DEHALOGENATION WHEN REACTED WITH A BASE AND CONVERTED TO THE EXCEPTED 3 - CYANOPYRIDINE(NICOTINONITRILE). THE LATTER COMPOUND IS A VALUABLE INTERMEDIATED FOR THE PRODUCTION OF NIACIN (NICOTINIC ACID), THE ANTI-PELLAGRA B COMPLEX VITAMIN.
Inventors
- 👤 Ronald Harmetz
- 👤 Roger J Tull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:23
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/84
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |