Abstract
Photochemical reaction of dimethylsufoxonium 3-ethoxycarbonyl-2-phenylallylide (I) gave diethyl p-terphenyl-2', 5'-dicarboxylate (II) in low yield. Irradiation of dimethylsulfoxonium 1, 2-dicarbomethoxy-5-carbethoxy-4-phenyl-1, 4-pentadien-3-ylide (VI) with an ultraviolet lamp afforded three products, 3-carbethoxy-1, 2-dicarbomethoxy-4-methylnaphthalene (VII) (37.5% yield), dimethyl 3-oxo-1, 3-dihydronaphtho [1, 2-c] furan-4, 5-dicarboxylate (VIII) (0.39% yield) and dimethyl 3-oxo-1, 3, 4, 5-tetrahydronaphtho [1, 2-c]-furan-4, 5-dicarboxylate (IX) (0.35% yield).
