Process for the preparation of aminated diketobis (aryl or heteroaryl)pyrrolopyrroles and the use thereof as photoconductive substances

摘要

A process for the preparation of compounds of formula I by reacting a pyrrolopyrrole of formula wherein X1 is a group selected from X2 is a group selected from or has the same meaning as X1, with a secondary amine of formula in the molar ratio 1:2, in the presence of an anhydrous dipolar aprotic solvent and of an amount 0.1 to 15 times in excess of stoichiometric proportion, based on the amine of formula III, of an anhydrous organic base, in the temperature range from 50 DEG to 230 DEG C. and under a pressure from 0 to 10 bar. The substituents R1 to R8, Y and Hal are as defined in claim 1. The compounds of formula I are especially suitable for use as photoconductive substances.