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在高硅 /铝比的酸性沸石分子筛HY上实现了Knoevenagel缩合反应 .Br nsted酸和Lewis酸均可催化Knoevenagel缩合反应 .考察了羰基化合物和活泼亚甲基化合物的反应活性顺序 .结果表明 ,羰基化合物的羰基极化程度越高 ,反应越容易进行 ;不同于碱催化时的Knoevenagel缩合反应 ,活泼亚甲基化合物的活泼氢的酸性并不是影响其反应活性的重要因素 .
The Knoevenagel condensation reaction was carried out on the acidic zeolite molecular sieve HY with high Si / Al ratio. Both Bronsted acid and Lewis acid could catalyze the Knoevenagel condensation reaction. The reaction order of carbonyl compounds and active methylene compounds was investigated. The results showed that carbonyl The higher the degree of carbonyl polarization of the compound, the easier the reaction. Unlike the Knoevenagel condensation reaction of the base catalysis, the acidity of the active hydrogen of the active methylene compound is not an important factor affecting the reactivity.