Patent ID: 6222074
Filing Date: 2001-04-24
Classification: C07C

Abstract:
A process for preparation of 4,6-diaminoresorcinol or salts thereof by reducing 4,6-bis(substituted)phenylazoresorcinol expressed by the formula [1] ##STR5##wherein, R denotes a halogen atom, an alkyl group having 1-5 carbon atoms, a hydroxycarbonyl group or an alkoxy group having 1-5 carbon atoms, n denotes 0 or any integer of 1-5, and two or more groups R may be same or different each other,with hydrogen in the presence of a metal catalyst and a solvent to obtain 4,6-diaminoresorcinol or salts thereof, characterized in that the reduction is carried out in the presence of an aliphatic nitrile compound as the solvent.