US3663559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of oxo-furo-pyridines from furylvinyl isocyanates
Assignee: Union Carbide Corp
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Filing: 1969-12-03
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Granted: 1972-05-16
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Expires: 1989-12-03
Abstract
Abstract CONDENSED PYRIDONES ARE PREPARED BY HEATING, FOR EXAMPLE, 2-(FURYL)-, 2-(THIENYL)-, OR 2-(PYRROLYL)VINYL ISOCYANATES. FOR INSTANCE, 4,5-DIHYDRO-4/OXO-FURO(3,2-C)PYRIDINES ARE PRODUCED BY HEATING 2-(2-FURYL)VINYL ISOCYANATES, 1,2-DIHYDRO-1/OXO-BENZOTHIENO(2,3-C)PYRIDINES ARE PREPARED BY HEATING 2-(3-BENZOTHIENYL)VINYL ISOCYANATES, AND 4,5-DIHYDRO-4-OXO PYRROLO(3,2-C)PYRIDINES ARE PREPARED BY HEATING 2-(PYRROLYL)VINYL ISOCYANATES. THE CONDENSED PYRIDONES ARE TRANSFORMED INTO VARIOUS DERIVATIVES BY UTILIZING KNOWN TYPES OF REACTION. THE PYRIDONES AND THEIR DERIVATIVES ARE USEFUL REACTION INTERMEDIATES.
Inventors
- 👤 Antoon M Derijckere
- 👤 Fernand G F Eloy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:16
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/273; C07D207/277; C07D221/00; C07D221/02; C07D221/04; C07D221/06; C07D221/10; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/52; C07D307/54; C07D307/77; C07D307/78; C07D307/79; C07D307/81; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/14; C07D333/20; C07D333/24; C07D333/50; C07D333/52; C07D333/54; C07D333/60; C07D471/00; C07D471/02; C07D471/04; C07D491/00; C07D491/02; C07D491/04; C07D495/00; C07D495/02; C07D495/04; C07D517/00; C07D517/02; C07D517/04; F; F02; F02D; F02D1/00; F02D1/16; F02D1/18; F02D1/183; F02M; F02M41/00; F02M41/08; F02M41/10; F02M41/12; F02M41/123; F02M41/128; F02M41/14; F02M41/1405; F02M41/1411; F02M41/1416
Claims Analysis
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |