环氧丙烷和甲醇在MgO上合成1-甲氧基-2-丙醇反应机理  

The Reaction Mechanism for the Synthesis of 1-methoxy-2-propanol on MgO Catalyst

作　　者：张文郁[1] 董庆年[1] 赵宁[1] 魏伟[1] 孙予罕[1] 

机构地区：[1]中国科学院山西煤炭化学研究所

出　　处：《物理化学学报》2005年第6期653-657,共5页Acta Physico-Chimica Sinica

基　　金：中国科学院知识创新工程(KGCX2-302)资助项目~~

摘　　要：应用原位FT-IR详细研究了MgO上甲醇对环氧丙烷的加成反应.结果表明在MgO催化剂上甲醇很易解离吸附形成甲氧基,根据负碳离子机理,吸附环氧丙烷可形成类丙烯物种.甲氧基对类丙烯物种的加成反应遵循反-Markownikov法则,高选择性地合成1-甲氧基-2-丙醇.The addition of propylene oxide with methanol was carried out over MgO and a detailed mechanism of the reaction was investigated by using FT-IR method. In-situ FTIR revealed that methanol dissociation into methoxide and proton took place readily on MgO, and propylene oxide adsorbed on MgO could generate propylene-like species via carbanion intermediate. As a result, methanol dissociated into adsorbed methoxide and reacted with the propylene-like species in anti-Markownikov fashion, which led to the high selectivity to 1-methoxy-2propanol on MgO.

关 键 词：甲醇 环氧丙烷 IR 1-甲氧基-2-丙醇 MgO 

分 类 号：O621.25[理学—有机化学]