Process for preparing 4-aminodiphenylamine intermediates
US6395933B1 · kind B1 · utility
13Cited by
7References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 23, 2001 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Jul 23, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/36
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention is directed to a method of producing one or more 4-aminodiphenylamine intermediates comprising the steps of bringing an aniline or aniline derivative and nitrobenzene into reactive contact; and reacting the aniline and nitrobenzene in a confined zone at a suitable time and temperature, in the presence of a mixture comprising a strong base and a suitable phase transfer catalyst. Certain phase transfer catalysts may also function as the strong base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.