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烯烃和环烯烃的亲电加成反应机理,过去的基础有机化学教材认为首先由带正电荷的离子与烯的部分极化的π键作用,生成一个很不稳定的带正电荷的中间体,它立即与反应体系中的负离子结合,生成最后的产物。例如:
The mechanism of electrophilic addition reaction between olefins and cycloalkenes is based on the past fundamental organic chemistry textbooks that the π bond of the positively charged ions and the partially polarized π-olefins leads to the formation of a very unstable positively charged intermediate, It immediately with the negative ions in the reaction system to produce the final product. E.g: