The photoreaction of the enone (I) with cyclopentene gave the radical coupling products, (VII) and (VIII), along with the hydrogen abstraction product (VI), but not [2π+2π] photocycloadduct. On the other hand, the photoreaction of I with cyclohexene proceeded in somewhat different manner to give the [2π+2π] photocycloadduct (V) other than the hydrogen abstraction product (VI) and the radical coupling product (IX).
烯酮(I)与
环戊烯的光反应生成了自由基偶联产物(VII)和(VIII),以及氢抽提产物(VI),但未见[2π+2π]光环加成产物。另一方面,I与
环己烯的光反应则以不同的方式进行,得到了[2π+2π]光环加成产物(V),而非氢抽提产物(VI)或自由基偶联产物(IX)。