吡啶在邻苯二甲酸单丁酯钠苄酯化中的相转移催化行为

STUDY ON PHASE TRANSFER CATALYTIC BEHAVIOR OF PYRIDINE IN THE BENZYL ESTERIFICATION OF SODIUM MONOBUTYL PHTHALATE

吡啶在邻苯二甲酸单丁酯钠苄酯化中的相转移催化行为郭锡坤高文华谭端明（汕头大学化学系，汕头５１５０６３）关键词吡啶，相转移催化，邻苯二甲酸丁苄酯，氯化Ｎ苄基吡啶，苄氯采用相转移催化新技术合成邻苯二甲酸丁苄酯（以下简称增塑剂ＢＢＰ）已有文献报道［１］．...

It has been found that the rate of esterification between sodium monobutyl phthalate and benzyl chloride can be raised remarkably by adding pyridine in the aqueous system, and the purity of butyl benzyl phthalate can be improved. In order to reveal the essence of this phenomenon, the catalytic behavior of pyridine in this reactive course has been studied by means of infrared spectrum, mass spectrum, 1H nuclear magnetic resonance and chemical analysis. The experimental results show that pyridine can easily react with benzyl chloride and form Nbenzyl pyridinium chloride (onium salt). Pyridine first reacts with benzyl chloride to form this onium salt, and then the cation of this onium salt acts as a phase transfer catalyst in this reactive system. This cation is stable so that its pyridine group can not be easily set free in the course of acting as the phase transfer catalyst.