Process for preparing diphenylamines
US5679856A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1996 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Feb 13, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C213/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is described for preparing diphenylamines of the formula ##STR1## by oxybromination of a phenol ether compound using elemental bromine in the presence of hydrogen peroxide and of a catalyst to give a brominated phenol ether compound which is subsequently reacted with a formanilide compound to give the compound of the formula (1). The oxybromination reaction is a regioselective, environmentally friendly and cost-efffective method of preparing brominated aromatic compounds. The diphenylamines of the formula (1) are industrially useful intermediates for the production, for example of dyes, and in particular of color formers of the fluoran type for pressure- or heat-sensitive recording systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.