4-Epifriedelin (III) and 4-epishionone (VII) were prepared by photoepimerization of friedelin (I) and shionone (VI), respectively. On base treatment, III and VII were completely isomerized into I and VI, respectively; this observation was discussed based on reflex effect.
4-epifriedelin (III) 和 4-epishionone (VII) 分别是通过油菜素(I)和葱酮(VI)的光二聚化制备的。在碱处理过程中,III 和 VII 分别完全异构化为 I 和 VI;这一观察结果基于反射效应进行了讨论。