固体碱性位对碳酸二甲酯与苯乙酮反应的影响

The Effect of Solid Basic Sites on the Reaction of Acetophenone with Dimethyl Carbonate

考察了固体碱不同的碱性位对碳酸二甲酯和苯乙酮反应合成苯甲酸甲酯的影响,并讨论了反应在不同碱性位上的反应机理。实验结果表明,由表面羟基引起的弱碱位有利于苯乙酮自身缩合反应(主产物为1,3-二苯基-2-烯基-丁酮)的进行,而Bronsted-Lewis酸碱离子对和固体碱表面配位不饱和的O2-所造成的强碱位由有利于碳酸二甲酯的甲氧基羰基化产物(主产物为苯甲酸甲酯和乙酸甲酯)的生成。

The influence of solid basic sites on the reaction of acetophenone with dirnethyl carbonate was researched. The results showed that the weak basic sites caused by hydroxyl groups were favored for the condensation of acetophenone, and the major products were 1.3-diphenyl-2-buten-l-one. Over the solid base catalysts with Lewis（M^n- ）-Bronsted（O^n-） ions pairs and strong basic sites caused by isolated O^2- ions, the reaction formed the methoxycarbonylation product （methyl benzoate and methyl acetate） as the main product. Moreover, the reaction mechanism over the different basic sites were also discussed.