二氧杂环丙烷参与的烯烃环氧化反应

酮是催化烯烃环氧化反应的一类重要催化剂, 酮与氧化剂KHSO₅ (Oxone)可原位产生二氧杂环丙烷中间体, 然后二氧杂环丙烷中间体将氧原子传递给烯烃使之成为环氧化物, 而自身又生成原来的酮. 酮的催化效能大小与酮产生二氧杂环丙烷的能力、二氧杂环丙烷将氧原子传给烯烃的能力以及反应条件下酮的稳定性有关. 本工作对各种脂肪酮、脂环酮、杂环酮对烯烃环氧化催化能力的大小及其影响因素进行了评述.

Epoxidation of Olefins with Dioxiranes

Ketones are one of the most powerful catalysts to the epoxidation of olefins. Ketones generate the corresponding dioxiranes with oxidant (KHSO5) in situation, then the dioxiranes transfer oxygen atom to olefins producing epoxide and initial ketone. The catalytic efficiency of ketones is dependent on the ability of ketones for generating the corresponding dioxirane, the ability of transferring oxygen atom to olefins and the stability of ketones under the reaction conditions. The catalytic efficiencies of a variety of fatty ketones, alicyclic ketones and heterocyclic ketones and the impact factors were reviewed in the paper.