tetrachloride and the other chlorinating reagents predominantly afforded β-chloro-β,γ-unsaturated ketones except the cases of the terminal alkyl group of the diketones was methyl or t-butyl. In these reactions, the isomerization of the β-chloro-α,β-unsaturated ketones to the β,γ-unsaturated isomers was involved; the isomerization was achieved by triphenylphosphine–carbon tetrachloride as well as by
用
三苯基膦-
四氯化碳和其他
氯化试剂
氯化无环
β-二酮主要得到β-
氯-β,γ-不饱和酮,但二酮末端烷基为甲基或叔丁基的情况除外。在这些反应中,涉及β-
氯-α,β-不饱和酮异构化为β,γ-不饱和异构体;异构化是通过
三苯基膦-
四氯化碳以及一些酸催化剂实现的。