Method for preparing 4-aminodiphenylamine
US7157605B2 · kind B2 · utility
9Cited by
3References
21Claims
0Family size
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Key dates
| Filing date | Sep 14, 2005 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Sep 14, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
4-aminodiphenylamine is prepared by reacting carbanilide and nitrobenzene in an adequate solvent, which may be nitrobenzene, in the presence of an appropriate organic base, which may be tetramethylammonium hydroxide, alone or in mixture with an inorganic base and subsequently reducing the reaction product in the presence of an appropriate catalyst and hydrogen gas. The subsequent reduction may be carried out on the reaction mixture before the reaction mixture is subjected to separation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.