28 and 29, and 35, but in this case, the reaction appeared more difficult. The thermocyclization process of ethylenic carbonyl compounds and related systems (A), and the thermal cleavage of cyclic analogs (B) are discussed, all these rearrangements involving an intramolecular hydrogen transfer.
线性ɛζ炔属酮的热分解18,22和25得到的环酮的优异的产率19和20,23和26分别。以相同的方式,-ζ-烯醛27和33给出了相应的甲酰基
环戊烷28和29和35,但是在这种情况下,反应显得更加困难。讨论了烯基羰基化合物和相关体系的热环化过程(A),以及环状类似物的热裂解(B),所有这些重排均涉及分子内氢转移。