Magnetically separable nano CeO2: a highly efficient catalyst for ligand free direct C–H arylation of heterocycles
作者:Radheshyam S. Shelkar、Kishor E. Balsane、Jayashree M. Nagarkar
DOI:10.1016/j.tetlet.2014.12.069
日期:2015.1
An efficient, ligand free, nano CeO2–Fe3O4 catalyzed direct C–H arylation of heteroarenes such as benzoxazole and benzothiazole has been carried out with aryl halides in DMSO or arenediazonium salts in water. The catalyst exhibited high activity with moderate to excellent product yields under mild reaction conditions. Nano CeO2–Fe3O4 was synthesized and characterized by SEM, TEM, EDAX, XRD, FTIR, DSC-TGA
一种有效的,无配体的纳米CeO 2 -Fe 3 O 4催化杂芳烃如苯并恶唑和苯并噻唑的直接C–H芳基化反应已在DMSO中使用了芳基卤化物或在水中使用了芳族重氮盐。在温和的反应条件下,该催化剂表现出高活性并具有中等至优异的产物收率。合成了纳米CeO 2 –Fe 3 O 4并通过SEM,TEM,EDAX,XRD,FTIR,DSC-TGA和ICP-MS对其进行了表征。即使经过十次循环再利用,催化剂的催化活性和稳定性也非常好