US3832401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homogeneous catalysts useful in the reduction of nitroaromatics to amines
Assignee: Texaco Inc
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Filing: 1971-03-04
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Granted: 1974-08-27
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Expires: 1991-03-04
Abstract
Abstract This invention concerns the use of homogeneous ruthenium and iron catalyst complexes preferably stabilized by a displaceable ligand such as triphenyl phosphine, and/or solubilized by a solvating agent such as the lower alkanols, said catalyst complexes being utilized as reducing agents in the presence of a non-aqueous, non-oxidizing reaction medium, at reaction temperatures of from about 35* to 160* C and under superatmospheric pressures of at least 100 psig, in a substantially hydrogen atmosphere, to selectively reduce at least one nitro group of nitroaromatics to the corresponding aromatic amine.
Inventors
- 👤 J Knifton
- 👤 R Suggitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:38
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2867628A
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US3110747A
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US3253039A
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US3194839A
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US3489786A
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US3454644A
Cited
US3637820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |