Sept-Oct 1982 Synthesis of Benzo[4,5]phenaleno[l,9-6c]thiophene and Benzo[4,5]phenaleno [9,l-fec]thiophene Yoshinori Tominaga and Raymond N. Castle* (1) Department of Chemistry, University of South Florida, Tampa, FL 33620 USA Milton L. Lee Department of Chemistry, Brigham Young University, Provo, Utah 84602 USA Received November 27, 1981 Two pentacyclic thiophenes, benzo[4,5]phenaleno[l,9-òc]thiophene (1) and benzo[4,5] ...