室温离子液体催化巯基乙酸异辛酯的合成

巯基乙酸异辛酯是一种广泛应用于精细化工、树脂和塑料制造的中间体,尤其在聚氯乙烯无毒制品中有着重要用途1],其合成方法的改进也成为研究的主要课题之一。巯基乙酸异辛酯的合成通常采用硫酸催化法2],由于浓硫酸污染环境、腐蚀设备,特别是近年来环保法规对环境和安全性不断提高的要求,用固体酸(分子筛、离子交换树脂、固体超强酸)等取代H2SO4、HF、A lC l3等强腐蚀性酸作为催化剂的催化工艺获得明显进展3],但这些催化剂也有自身的缺点4]。室温离子液体是近年来受到极大关注的一类新材料,它为人们探索环境友好的催化体系和溶剂提供了…

Synthesis of 2 -ethylhexyl mercaptoacetate in room temperature ionic liquids

The synthesis of 2-ethylhexyl mercaptoacetate by chlorocetic acid and 2-ethylhexanol was investigated in various 1,3-dialkeylimidazolium and alkylpyridium ionic liquids under mild conditions.The investigation suggested that 1-butyl-3-methylimidazolium bromide ionic liquid had optimal catalytic activity for the esterification,and the solvent composed of 1-buty-3-methylimidazolium hexafluorophosphate and water could serve as a phase transfer catalyst for 2-ethylhexyl mercaptoacetate.Medium to high conversion and selectivity were achieved.The isolation of the desired products could be achieved via simple decantation and ionic liquids could be reused.The catalytic activity was not decreased obviously after 5 times recycle.This protocol has notable advantages of no need of organic solvents,mild conditions,simple operation,short reactioin time,ease work-up,high yields and recycling of the ionic liquid.