关于烯烃的亲电加成反应机理与立体选择性

Olefin′ s Electropholic Addition Reaction Mechanism and Stereoselectivity

烯烃的亲电加成反应机理一般认为有两种可能历程。一种是通过生成环状正离子中间体进行的，通过这样的历程进行的加成反应是反式加成。另一种是通过碳正离子中间体进行的，它所得到的产物无立体选择性。

Olefin′ s electropholic addition reaction mechanism is gererally supposed to be of wo possible processes.One is conducted amidst formed cyclic cation intermediate and the reaction thus carried out is known as anti- form addition.The other is conducted amidst carbonium ion intermediate and the product thus brought about has no stereoselectivity.