以N,N,N′,N′-四甲基联苯二胺、2,6-二甲氧基萘和2,7-二甲氧基萘为光敏剂,在正己烷溶液中实现了双环[2,2,1]-2,5-庚二烯到四环[2,2,1,0~(2,6),0.(3,5)]庚烷的异构化。测定了反应的量子产率。讨论了反应机理。通过激发态的光敏剂与二烯之间的电子转移反应,形成单重态和三重态处于平衡状态的离子自由基对中间体。处于溶剂笼中的三重态离子自由基对经电子反传,产生激发三重态二烯。最后该激发态二烯经分子内[2+2]环合加成反应异构化为四环烷。 With N, N, N ’, N’-tetramethylbiphenyldiamine, 2,6-dimethoxynaphthalene and 2,7-dimethoxynaphthalene as photosensitizers, bicyclo Heteroamination of [2,2,1] -2,5-heptadiene to tetracyclo [2,2,1,0- (2,6), 0. (3,5)] heptane. The quantum yield of the reaction was measured. The reaction mechanism is discussed. Through the electron transfer reaction between the excited state photosensitizer and the diene, an ionic radical pair intermediate in which singlet and triplet are in equilibrium is formed. The triplet ion radical in the solvent cage reverses electronically and generates an excited triplet diene. Finally, the excited state of diene by intramolecular [2 + 2] cycloaddition reaction isomerization to tetracycloalkane.