Reaction of (E)-O-arylbenzaldoximes with sodium methoxide in methanol. Effect of leaving group upon nitrile-forming transition state
作者:Bong Rae Cho、Jinhee Jung、Eun Kyung Ahn
DOI:10.1021/ja00035a040
日期:1992.4
Reactions of (E)-O-arylbenzaldoximes 1-3 with MeONa-MeOH have been studied kinetically. The reactions proceed via competing E2 and S N Ar reactions, in which the first step is rate-determining. Although the reactions were strongly influenced by the electronic effect of the β- and O-aryl substituents, they were insensitive to the steric effect of the O-aryl group, except that the S N Ar reaction was
已经对 (E)-O-芳基苯甲醛肟 1-3 与 MeONa-MeOH 的反应进行了动力学研究。反应通过竞争的 E2 和 SN Ar 反应进行,其中第一步是速率确定。尽管反应受到β-和O-芳基取代基的电子效应的强烈影响,但它们对O-芳基的空间效应不敏感,除了SN Ar反应被2的CF 3 基团延迟。对于 MeONa-MeOH 促进的 1-3 消除,k H /k D 值增加,Hammett p 值随着离去基团的改善而降低