Unraveling the cation and anion effects and kinetics for ionic liquid catalyzed direct synthesis of methyl acrylate under mild conditions
作者:Gang Wang、Zengxi Li、Chunshan Li、Suojiang Zhang
DOI:10.1039/d0gc03133j
日期:——
The direct synthesis of methyl acrylate (MA) from methyl acetate and trioxane at 350–380 °C is regarded as a supplementary route for the industrial propylene oxidation process; however, it suffers from rapid catalyst deactivation. Herein, a novel ionic liquid catalyzed mild liquid-phase system was developed for the direct synthesis of MA from methyl acetate and trioxane, where N,O-bis(trimethylsilyl)acetamide
在350-380°C下由乙酸甲酯和三恶烷直接合成丙烯酸甲酯(MA)被认为是工业丙烯氧化工艺的补充途径。然而,它遭受催化剂快速失活的困扰。本文开发了一种新型的离子液体催化的温和液相体系,用于由乙酸甲酯和三恶烷直接合成MA,其中N,O-双(三甲基甲硅烷基)乙酰胺(BSA)用作α-去质子化和烯醇化的前身乙酸甲酯的甲硅烷基醚化。在[阳离子] Cl / MCl x(M = Cu +,Fe 3+,Zn 2+)的催化下,三恶烷分解为甲醛,乙酸甲酯烯化为1-甲氧基-1-三甲基甲硅烷基氧乙烯。和Al 3+)和[阳离子] F。观察到阳离子和阴离子对MA的收率和选择性有显着影响,这是由于空间位阻,酸性位点类别和吡啶探针FT-IR表征证实的强度所致。其结果是,当[N3,3,3,3] F和[N3,3,3,3] CL /产量的AlCl与MA的94.6%的选择性达60.2%是可以实现3与67摩尔%的AlCl 3分别为在