Commercial CaO was modified simply with benzyl bromide. The modified CaO had good water resistance, and characterization by FTIR and TG revealed the modifier was chemically bonded to the CaO surface. Commercial CaO and CaO modified with benzyl bromide were investigated as catalysts for the Henry reaction between benzaldehyde and nitromethane. It was found that the catalytic activity of the modified CaO was greatly improved, with high conversion of benzaldehyde to the (E)-phenyl nitroolefin and 1-phenyl-2-nitroethanol, and with different selectivity from commercial CaO. The effect of modification and reaction conditions on yield, selectivity, and mechanism were studied thoroughly.
用
溴化苄对商用 CaO 进行了简单的改性。改性后的 CaO 具有良好的耐
水性,傅立叶变换红外光谱和热导分析表明改性剂与 CaO 表面发生了
化学键合。研究了商用 CaO 和用
溴化苄修饰的 CaO 作为
苯甲醛和
硝基甲烷亨利反应的催化剂。研究发现,改性 CaO 的催化活性大大提高,
苯甲醛转化为 (E)- 苯基硝基烯烃和
1-苯基-2-硝基乙醇的转化率很高,而且与商用 CaO 的选择性不同。研究人员深入研究了改性和反应条件对产率、选择性和机理的影响。