There is no evidence for hydride shift in the reaction of alcohols 1 and 2 with dichlorocarbene. Accordingly, the intermediate cannot be a free carbocation. It is suggested that the products are formed through a combination of SNi and direct displacement reactions in which tight ion pairs are involved.
没有证据表明醇1和2与二
氯卡宾的反应中存在
氢化物转移。因此,中间体不能是游离碳正离子。建议产物通过S N i和直接置换反应的结合而形成,其中涉及紧密的离子对。