Process for the preparation of perylene-3,4,9,10-tetracarboxylic acid monoanhydride monoimides

摘要

Compounds of the formula <IMAGE> in which R denotes hydrogen, hydroxyl, amino or optionally substituted alkyl, X denotes chlorine or bromine and n is a number from zero to 4, are obtained from the corresponding mono-alkali metal salts of perylene-3,4,9,10-tetracarboxylic acid monoanhydrides by reaction with compounds of the formula R-NH2, in which R has the above meaning, at 0 DEG -130 DEG C. The compounds are colorants or starting materials for colorants.