Synthesis of Diindolocarbazoles by Ullmann Reaction: A Rapid Route to Ladder Oligo(p-aniline)s
Organic Letters2004Vol. 6(19), pp. 3413–3416
Citations Over TimeTop 10% of 2004 papers
Abstract
[structure: see text] 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. These electroactive ladder oligomers may have great potential in organic electronics.
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