The synthesis of all of the monomethyl isomers of benzo[b]naphtho[1,2‐d]thiophene

All isomers of the monomethylbenzo[bnaphtho[1,2‐d]thiophenes were synthesized by photocyclization of 2‐styrylbenzo[b]thiophenes which were prepared by the Wadsworth‐Emmons reaction or the Wittig reaction.