Preparation of pigments

摘要

The invention relates to a process for preparing triphendioxazine compounds by cyclizing the intermediates (IV) in the presence of manganese oxide and sulfuric acid to form compounds of the general formula (I) a process for condensing compounds of the general formula (II) with compounds of the general formula (III) to form the chlorine-free intermediates (IV) and also compounds of the general formula (IV).