SEARCH Articles Figures Tables 1-Benzo thiophen 2- thiophene, Diels-Alder 2- thiophene, Diels-Alder reactions 3- thiophene, synthesis Benzo Diels-Alder reaction Benzo thiophene, synthesis Benzo thiophenes synthesis Benzo thiophens Diels-Alder synthesis Synthesis Diels-Alder reaction Thiophene reaction Thiophenes, synthesis