非经典碳正离子简介

非经典碳正离子作为一种特殊的反应中间体,具有重要的理论和实际研究的意义。本文以碳正离子理论的发展为主线,以历史上非经典碳正离子(特别是降冰片基正离子)之争为中心,简要综述了Winstein、Brown和Olah三人的观点,并结合最新进展进行评述。此外,还对除降冰片基正离子之外的非经典碳正离子进行了适当的讨论。

A Brief lntroduction to the Nonclassical Carbocations

Being a kind of special intermediate species, the nonclassical carbocations are of theoretical and applicable importance. This article reviews the development of the theory of the nonclassical carbocations, and provides the perspectives of Winstein, Brown and Olah in the debate, respectively. Furthermore, the article comments on these views on the basis of the latest research, and discusses about a few kinds of nonclassical carbocations other than the well noted 2-norbornyl cation.