Nitrosation of gem-dichloro(alkyl)cyclopropanes with the complex NOCl·2SO3 gave regioisomeric alkyl-5-chloroisoxazoles in high yields; a similar reaction with 1,2-bis(gem-dichlorocyclopropyl)ethane afforded the corresponding bis(5-chloroisoxazoles). The reactivities of gem-dichlorobicyclo[n.1.0]alkanes depend on their spatial structures, sharply decreasing with an increase in the number of the methylene units in the bicyclic molecule.
gem-二
氯(烷基)
环丙烷与复合物NOCl·2SO3的硝化反应高产率地生成了区域异构的烷基-5-
氯异噁唑;与1,2-双(gem-二
氯环丙基)
乙烷的类似反应则生成了相应的双(5-
氯异噁唑)。gem-二
氯双环[n.1.0]
烷烃的反应性取决于它们的空间结构,随着双环分子中亚甲基单元数量的增加而急剧下降。