Abstract
Thiophene-fused 3-methylene-2,3-dihydrothiophene derivatives 2 were synthesized by intramolecular [4+2] cycloaddition of 2-alkynyl-3-(9-anthrylthio)thiophene derivatives 1. These derivatives showed blue fluorescence in a CH2Cl2 solution and phenyl-substitution derivative indicated relatively strong fluorescence in a solid stat