New and facile synthesis of symmetric diindolocarbazoles was developed using the copper- catalyzed Ullmann reaction. The key step is a double-intramolecular cyclization reaction realized on N-alkyl-3, 6-dibromo-2, 7-bis (2'aminophenyl) carbazole derivatives which offers the desired symmetric ladder oligo (p-aniline) s. Depending upon the nature of the side- and/or end-groups, well-defined thin films and/or semiladder polymers could be obtained. ...
