Method for the production of perylene-3,4:9,10-tetracarboxylic acid diimides and perylene-3,4:9,10-tetracarboxylic acid dianhydride and naphthalene-1,8-dicarboxlimides

摘要

A process for preparing perylene-3,4:9,10-tetracarboxylic diimides of the general formula I comprising dimerizing a naphthalene-1,8-dicarboximide of the formula II in a reaction medium consisting essentially of an apolar aprotic organic solvent and an alkali metal base and subsequently reoxidizing the resulting alkali metal salt of the leuco form of the perylene-3,4:9,10-tetracarboxylic diimide in the presence of a polar solvent.