己内酰胺类离子液体催化合成N-单烷基苯胺

Synthesis of N-propylaniline with the caprolactam ionic liquids as catalysts

在己内酰胺类BrΦnsted酸离子液体催化下,苯胺和溴丙烷发生N-烷基化反应,高选择性地制备N-单烷基苯胺。考察了苯胺和溴丙烷摩尔比、缚酸剂用量、反应温度、反应时间、催化剂用量和催化剂类型等因素对反应结果的影响。确定其最佳反应条件为:n(苯胺)∶n(溴丙烷)∶n(催化剂)∶n(三乙胺)=1.0∶1.0∶0.05∶2.0,反应温度60℃,反应时间为1.0 h,在上述反应条件下,苯胺的转化率可达到92.40%,N-单烷基苯胺的选择性可达到93.40%。

The reaction of aniline with bromine propane in the presence of caprolactam BrΦnsted acidic ionic liquids as catalysts was carried out,showing a high selectivity of N-propylaniline.The effects of the molar ratio of aniline and bromine propane,the dosages of HCl acceptor,reaction temperature,reaction time,the dosages and types of catalysts on the yield were investigated.The optimum conditions were as follows：n（aniline）∶n（bromine propane）∶n（catalyst）∶n（triethylamine）=1.0∶1.0∶0.05∶2.0,reaction temperature 60 ℃,reaction time 1.0 h.Under such reaction conditions,the conversion of aniline was over 92.40%,and the selectivity of N-propylaniline achieved up to 93.40%.