Manufacture of dimethylaminobenzenecarboxylic acid esters
US4002664A · kind A · utility
3Cited by
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14Claims
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Key dates
| Filing date | Jun 5, 1974 |
| Grant date | Jan 11, 1977 |
| Priority date | — |
| Expiry date | Jun 5, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J31/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Dimethylaminobenzenecarboxylic acid esters are produced by reaction of nitrobenzenecarboxylic acid esters with formaldehyde and hydrogen under pressure in the presence of a hydrogenation catalyst containing metals of atomic numbers 24 to 29 and of a weak acid, at temperatures from 35.degree. to 150.degree. C. The products are starting materials for the synthesis of dyes, especially of crystal violets, and of reactive dyes and pesticides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.