calculations were used to rationalize the substituent effects on the competition between the benzylic cleavage and the McLafferty reaction and to clarify the role of the distonic arenium ion-type intermediate formed by the γ-hydrogen-transfer step of the McLafferty reaction. The ipso-protonolysis of the benzyl residue giving rise to the loss of substituted benzenes specifically from most of the para-isomers
摘要 在本文和随附的文章中,研究了 2-苄基林丹和 11 种在苄基部分带有间位或对位取代基的衍
生物的自由基阳离子的单分子断裂,特别关注 McLafferty 反应之前的氢交换。 . 记录标准 EI 质谱、低能量 (11 eV) 质谱和质量分析离子动能 (MIKE) 谱,以探测碎裂和氢交换的激发能量和离子寿命依赖性。密度泛函理论计算用于合理化取代基对苄基裂解和麦克拉弗蒂反应之间竞争的影响,并阐明麦克拉弗蒂反应的 γ-氢转移步骤形成的非张性
砷离子型中间体的作用。