Process for preparing 1-chloro-2,4-diaminobenzene
US6034276A · kind A · utility
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7Claims
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Key dates
| Filing date | Mar 22, 1999 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Mar 22, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/365
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is an improved process for preparing 1-chloro-2,4-diaminobenzene by the selective hydrogenation of 1-chloro-2,4-dinitro-benzene wherein the hydrogenation is carried out in the presence of a modified Raney nickel catalyst containing about 70 to 95 weight percent nickel, about 4 to 10 weight percent aluminum, about 0.1 to 4 weight percent molybdenum, and from 0 to about 20 weight percent cobalt. The 1-chloro-2,4-diaminobenzene is useful as an intermediate for disperse dyes and for color photography.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.