用β-环糊精交联树脂作催化剂选择合成对羟基苯甲酸

Selective Synthesis of 4-Hydroxybenzoic Acid Using an Immobilized β-Cyclodextrin as Catalyst

一、前言环状糊精(Cyclodextrin,简称 CD),是由6个以上的葡萄糖以α-1,4糖甙键连接而成的环状低聚糖化合物。常见的有α、β、γ三种,分别含有6、7、8个葡萄糖单元,其结构式为:

The selective synthesis of 4-hydroxybenzoic acid from phenol and carbon tetra-chloride using an immobilized β-cyclodextrin as catalyst is described in thispaper.The selectivity is as high as 100%.The reaction was carried out at 80 Cfor 15hrs.β-CD epichlorohydrin crosslinked resins used as catalyst is recoverableand reuseable without decreasing selectivity and yield.