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研究了在无溶剂条件下以催化剂量的三氟甲磺酸(TfOH)及稀土盐(Re(OTf)3)为复合催化剂,对氟苯与苯甲酰氯的傅克酰基化反应的催化性能.研究发现,由于少量固体酸Re(OTf)3的添加,可以使液体酸催化剂的用量减少一半,且TfOH和Re(OTf)3间存在协同作用.对于氟苯与苯甲酰氯的傅克酰基化反应,考察了11种稀土Re(OTf)3的作用,发现La(OTf)3具有最好的助催化活性,且可重复使用,经140℃反应4 h后,产物对氟二苯甲酮的选择性高于99%,产率达到87%.对于不同反应物的酰基化反应,不同稀土的Re(OTf)3显示出不同的助催化作用.对于二甲苯的傅克酰基化反应,在所测试的Re(OTf)3催化剂中,Ce(OTf)3的助催化效果最显著.
The catalytic performance of Friedel-Crafts reaction of fluorobenzene with benzoyl chloride was studied in the absence of solvent under the conditions of catalytic amount of triflate (TfOH) and rare earth salt (Re (OTf) 3) as catalyst. It is found that the addition of a small amount of solid acid Re (OTf) 3 can reduce the amount of liquid acid catalyst by half and the synergistic effect between TfOH and Re (OTf) 3.For Friedel-Crafts fluorobenzene and benzoyl chloride (OTf) 3. It was found that La (OTf) 3 has the best cocatalytic activity and can be reused. After reacting at 140 ℃ for 4 h, the reaction of the product with fluorobenzophenone The selectivity is higher than 99% and the yield is up to 87%. Re (OTf) 3 of different rare earths shows different promoters for the acylation of different reactants. For the Friedel-Crafts reaction of xylene, Of the tested Re (OTf) 3 catalysts, Ce (OTf) 3 has the most significant promoter effect.