Synthesis of phenanthro[b]thiophenes

Abstract All isomers of the parent phenanthro[ b ]thiophenes, namely, phenanthro[1,2‐ b ]thiophene, phenanthro‐[2,1‐ b ]thiophene, phenanthro[2,3‐ b ]thiophene, phenanthro[3,4‐ b ]thiophene, phenanthro[3,4‐ b ]thiophene, phenanthro[4,3‐ b ]thiophene and phenanthro[9,10‐ b ]thiophene have been synthesized.