Isomerization of Epoxides into Allylic Alcohols Catalyzed by Supported Au Nanoparticles on TiO<sub>2</sub>: A Mechanistic Insight
作者:Argyro T. Papastavrou、Marios Kidonakis、Manolis Stratakis、Michael Orfanopoulos
DOI:10.1021/acs.joc.0c01889
日期:2020.10.16
Based on primary and β-secondary isotope effects, it is established that the isomerization of epoxides into allylic alcohols catalyzed by supported Au nanoparticles proceeds via an unsymmetrical concerted transition state in which there is partial positive charge developing on the C–O carbon atom progressing C–H abstraction. A carbocationic intermediate can be formed only in cases of sufficient stabilization
基于一级和二级次级同位素效应,可以确定,负载的Au纳米颗粒催化的环氧化物异构化为烯丙基醇是通过不对称一致的过渡态进行的,其中在C–O碳原子上有部分正电荷发展–H抽象。仅在通过适当的取代基充分稳定正电荷的情况下,才能形成碳正离子中间体。