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Note | Regular issue | Vol 65, No. 11, 2005, pp.2791-2798
Published online, 13th September, 2005
DOI: 10.3987/COM-05-10536
Synthesis of Novel Triphenylene-Type Cations Containing Both Thiophene Rings and a Tropylium Ion Ring. Cyclohepta[e]thieno[2,3-g]benzodithiophenylium Ion and Cyclohepta[e]thieno[3,2-g]benzodithiophenylium Ion

Teppei Oyanagi, Yasuhiro Sakurai, and Kimiaki Yamamura*

*Department of Chemistry, Faculty of Science, Kobe University, Nada, Kobe 657-8501, Japan

Abstract

An isomeric pair of cyclohepta[e]thieno[g]benzodithiophenylium ions has been synthesized by an intramolecular Friedel-Crafts type reaction of 2(3)-thienyl-3(2)-cycloheptatrienylthiophenes in a one-pot reaction. These are the isoelectronic cations of triphenylene having both electron-rich and electron-deficient aromatic rings, thiophene and tropylium ion, respectively, in place of phenyl rings.