of proto-photocycloadducts of methyl 2,4-dioxopentanoate to methylenecycloalkanes and -alkenes spontaneously caused retro-benzilic acid rearrangement in high yields. The results are utterly different from those of sterically-crowded acyclic alkenes, with which the rearrangement occurred by thermolysis as a minor process.
2,4-二氧代
戊酸甲酯与亚甲基环
烷烃和烯烃的一系列原光环加合物自发地以高产率引起逆
苯甲酸重排。结果与空间拥挤的无环烯烃的结果完全不同,后者通过热解作为次要过程发生重排。