Process for the preparation of derivatives of 3-(4-hydroxy-anilino)carbazole
The process for the preparation of a 3-(4-hydroxyanilino)carbazole of the formula STR1 wherein R is hydrogen, alkyl having 1 to 8 carbon atoms or halogenoalkyl having 1 to 8 carbon atoms, comprising reacting a 3-aminocarbazole of the formula STR2 with p-hydroquinone or p-aminophenol or a mixture of p-hydroquinone and p-aminophenol in at least stoichiometric amounts by heating to a temperature of 150° to 300° C. with exclusion of oxygen.