SUBSTITUTED NAPHTHO1,8-DE:5,4-D'E'BIS1,3THIAZINES, PROCESS FOR THEIR PREPARATION AND THE USE THEREOF

摘要

Substituted naphtho¢1,8-de:5,4-d'e'!bis¢1,3!thiazines, process for their preparation and the use thereof compounds of formula I (I), wherein X1 and X2 are each independently of the other O, S or Se, and R1 and R2 are each independently of the other a monovalent radical of an aliphatic or aromatic hydrocarbon of 1 to 20 carbon atoms which is unsubstituted or substituted by NH2, C1-C6alkyl, C1-C6alkoxy, phenyl or C3-C8cycloalkyl, The compounds of formula I are able to form electrically conductive charge transfer complexes.