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Paper | Regular issue | Vol 45, No. 3, 1997, pp.467-474
Published online, 1st January, 1970
DOI: 10.3987/COM-96-7686
Novel Pentacyclic π-Conjugated Cations Containing Both Heteroaromatic Units and a Tropylium Ion 2. Synthesis of Cyclohepta[a]benzofuro[c]naphthalenylium and Cyclohepta[a]benzothieno[c]-naphthalenylium Ions

Kimiaki Yamamura,* Taihei Yamane, Hideki Takagi, and Hideyoshi Miyake

*Department of Chemistry, Faculty of Science, Kobe University, Nada-Ku, Kobe 6557-8501, Japan


TTwo isomeric pairs of cyclohepta[a]benzofuro[c]naphthalenylium ions (5 and 7) and cyclohephta[a]benzothieno[c]naphthalenylium ions (10 and 11) have been synthesized by an intramolecular Friedel-Crafts type reaction of o-benzofurylcycloheptatrienylbenzenes (3 and 8) and o-benzothienylcycloheptatrienylbenzenes (14 and 15), respectively, in a one-pot reaction.