Vapour-Phase Reaction of Acetophenone with Methanol or Dimethyl Carbonate on Magnesium Oxide and Magnesium Phosphates
作者:Marı́a Angeles Aramendı́a、Victoriano Borau、César Jiménez、José Marı́a Marinas、Francisco José Romero
DOI:10.1006/jcat.1998.2360
日期:1999.4
The vapour-phase reaction of acetophenone with methanol on magnesium oxide, various magnesium phosphates, and combinations of the two types of catalysts was studied. The process was found to involve the Meerwein–Ponndorf–Verley reaction, aldol condensations, dehydrations, and hydrogenations. The presence of basic sites is indispensable for the reaction to develop; however, acid sites also play an active
研究了苯乙酮与甲醇在氧化镁,各种磷酸镁和两种催化剂的组合上的气相反应。发现该过程涉及Meerwein-Ponndorf-Verley反应,醛醇缩合,脱水和氢化。碱性位点的存在对于反应的发展是必不可少的。然而,酸性位点也起着积极的作用。每个反应产物的选择性取决于所用的特定催化剂。含有最大数量的酸和碱性位点的催化剂的总转化率最大。同样,具有大量酸位的催化剂对相应烯烃显示出更高的选择性。使用碳酸二甲酯代替甲醇会在一定程度上改变反应的选择性,具体取决于特定的催化剂和操作条件。但是,在某些情况下,这也会导致总转化率明显下降。