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Synthesis 1996; 1996(11): 1302-1304
DOI: 10.1055/s-1996-4386
short paper
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Vinylogous Tetraazafulvalenes: New Deeply Coloured Compounds Derived from Simple Amidines

J. Brandenburg, C. Käpplinger, R. Beckert*
  • *Institut für Organische und Makromolekulare Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 10, D-07743 Jena, Germany, Fax +49(3641)636655
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Publication Date:
31 December 2000 (online)

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A one-step synthesis of vinylogous tetraazafulvalenes by simple cycloacylation of acetamidine 2 with bisimidoyl chlorides of oxalic acid 1 is described. The deeply coloured products 4a-i constitute a new class of stable neutrocyanines as well as compounds with indigoid properties.

amidines - cycloacylation - imidoylchlorides - indigoid dyes - vinylogous tetraazafulvalenes