Selective hydrogenation of nitroaromatics to <i>N</i>-arylhydroxylamines in a micropacked bed reactor with passivated catalyst
作者:Feng Xu、Jian-Li Chen、Zhi-Jiang Jiang、Peng-Fei Cheng、Zhi-Qun Yu、Wei-Ke Su
DOI:10.1039/d0ra05715k
日期:——
rendering the desired product with a conversion rate of 99.4% and a selectivity of 99.8%. The regeneration of catalytic activity was also studied, and an in-column strategy was developed by pumping the passivate liquid overnight. Finally, the generality of the method was explored, and 7 substrates were developed, most of which showed a good conversion rate and selectivity, indicating that the method has a
在这项贡献中,建立了将硝基芳烃选择性催化氢化为相应的N-芳基羟胺的方案。1-(4-氯苯基)-3-((2-硝基苄基)氧基)-1 H的还原-吡唑是合成抗真菌试剂唑菌胺酯的中间体,包括碳-氯键、苄基、碳-碳双键和其他容易还原的结构,被选为催化剂评估和条件优化的模型反应。广泛的钝化剂评估表明,用氨水/DMSO(1 : 10,v/v)处理的 RANEY®-镍提供了最佳结果,尤其是粒径为 400-500 目的情况下。将改性催化剂与连续流动反应技术相结合,反应在室温下进行,得到所需产物的转化率为99.4%,选择性为99.8%。还研究了催化活性的再生,并通过泵送钝化液过夜来开发柱内策略。最后,