Can Brønsted acids catalyze the epoxidation of allylic alcohols with H2O2? With a little help from the proton, the H3PMo12O40 acid did it and well
作者:Castelo Bandane Vilanculo、Márcio José da Silva
DOI:10.1016/j.mcat.2021.111780
日期:2021.8
Brønsted acid in epoxidation reactions of terpene alcohols with hydrogen peroxide. Keggin heteropolyacids (HPAs) (i.e., H3PW12O40, H3PMo12O40, and H4SiW12O40) were compared to the common Brønsted acids (i.e., sulfuric, and p-toluenesulfonic acids) in epoxidation reactions of nerol, the model molecule selected. The effects of the main reaction variable, such as temperature, time, load and sort of acid catalyst
在这项工作中,我们探索了典型的布朗斯台德酸在萜烯醇与过氧化氢的环氧化反应中的催化活性。将 Keggin 杂多酸 (HPA)(即 H 3 PW 12 O 40、H 3 PMo 12 O 40和 H 4 SiW 12 O 40)与环氧化中常见的布朗斯台德酸(即硫酸和对甲苯磺酸)进行比较橙花醇的反应,选择的模型分子。评价了主要反应变量,如温度、时间、负载和酸催化剂种类的影响。在研究的催化剂中,H 3 PMo 12 O 40是对目标产物环氧化物橙花醇最具活性和选择性的催化剂。获得的最高转化率为 99%,对橙花醇环氧化物的选择性为 97%。作为实验结果和催化剂酸性性质的基础,对反应机理进行了讨论。与非质子催化剂(即,Na 3 PMo 12 O 40)的比较表明存在于H 3 PMo 12 O 40中的钼和质子都是该环氧化反应中的主要活性位点。