1,2,4,5-Tetrasubstituted cyclopentadienes VIa-VIf or phenanthrene derivative VIII, respectively, were obtained as the main photoproducts upon irradiation of sulfones Ia-If and II in acetonitrile, methanol or benzene. Bridged isomers Va-Vd were isolated from the reaction of Ia-Id carried out in acetonitrile. Probable course of the investigated photochemical transformations of 4H-thiopyran-1,1-dioxides is discussed.
1,2,4,5-四取代环戊二烯VIa-VIf或菲喃衍生物VIII分别在乙腈、甲醇或苯中照射磺酮Ia-If和II时作为主要光产物得到。在乙腈中进行的Ia-Id反应中,分离出桥联异构体Va-Vd。讨论了4H-硫代吡喃-1,1-二氧化物的光化学转化的可能过程。