US3729512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homogeneous ruthenium-catalyzed reduction of nitro compounds
Assignee: Wyeth Holdings LLC
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Filing: 1968-11-27
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Granted: 1973-04-24
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Expires: 1988-11-27
Abstract
Abstract A CATALYTIC PROCESS FOR THE REDUCTION OF NITRO COMPOUNDS TO THE CORRESPONDING AMINES IS DESCRIBED. THE PROCESS USES FOR THE REDUCTION A MIXTURE OF CARBON MONOXIDE AND HYDROGEN AND AS CATALYSTS RUTHENIUM CARBONYLS OR COMPOUNDS WHICH ARE TRANSFORMED INTO RUTHENIUM CARBONYLS IN THE REACTION, SUCH AS TRIS(ACETYLACETONATO) RUTHENIUM. THE REACTIONS ARE, IN GENERAL, STRONGLY EXOTHERMIC, AND ADDITIONAL SOLVENTS, SUCH AS BENZINE, ARE DESIRABLE. GOOD YIELDS OF THE AMINES ARE OBTAINED AND THE OPERATION IS CARRIED OUT AT MODERATE PRESSURE, FOR EXAMPLE 130* TO 160*C. UNDER MODERATE PRESSURE, FOR EXAMPLE 200 TO 300 ATMOSPHERES.
Inventors
- 👤 Eplattenier F L
- 👤 F Calderazzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:20
CPC Classifications
H; H10; H10D; H10D64/00; H10D64/20; H10D64/27; H10D18/00
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |