甲醇为氢源的连续化催化转移加氢合成芳胺

Continuous catalytic transfer hydrogenation of methanol as hydrogen source to synthesize aromatic amines

开发了一种温和高效的以甲醇为氢源,以Ru-Fe双金属催化剂催化的硝基芳烃连续化转移加氢方法。采用浸渍法制备Ru-Fe双金属催化剂,通过电感耦合等离子体-质谱(ICP-MS)、透射电子显微镜(TEM)、X射线衍射(XRD)、氢气程序升温还原(H_(2)-TPR)对催化剂进行表征。结果表明催化剂具有较小的粒径和较好的分散性。在Ru-Fe双金属催化剂上,成功实现了硝基芳烃与甲醇在无外加氢源条件下的连续化转移加氢合成芳胺。通过对反应条件的调控,成功得到了一系列产率较高的胺类化合物。特别地,该方法对不饱和基团(醛基、羰基或炔基)取代的硝基芳烃的加氢表现出优异的选择性和转化率。

A mild and efficient method for continuous transfer hydrogenation of nitroaromatics catalyzed by Ru-Fe bimetallic catalyst with methanol as hydrogen source was developed.Ru-Fe bimetallic catalysts were prepared by impregnation method and characterized by inductively coupled plasma-mass spectrometry(ICP-MS),transmission electron microscopy(TEM),X-ray diffraction(XRD),and hydrogen temperature-programmed reduction(H_(2)-TPR).The results showed that the catalyst had smaller particle size and better dispersion.On the Ru-Fe bimetallic catalyst,the continuous transfer hydrogenation of nitroaromatics and methanol to aromatic amines without external hydrogenation source was successfully realized.A series of amines with high yields were successfully obtained by adjusting the reaction conditions.In particular,the method exhibited excellent selectivity and conversion for the hydrogenation of unsaturated group(aldehyde,carbonyl or alkynyl)substituted nitroaromatics.