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

摘要

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.