A facile and eco-friendly synthesis of imidazo[1,2-a]pyridines using nano-sized LaMnO3 perovskite-type oxide as an efficient catalyst under solvent-free conditions
作者:Tayebeh Sanaeishoar、Haman Tavakkoli、Fouad Mohave
DOI:10.1016/j.apcata.2013.10.026
日期:2014.1
and reusable catalyst showed excellent catalytic activity for the synthesis of imidazo[1,2-a]pyridines. LaMnO3 catalyst could be recovered and reused in five reaction cycles, giving a total TON = 2790 and TOF = 372. The products were prepared under solvent-free conditions without any additives. Principal features of this simple method include non-hazardous reaction conditions, low catalyst loading and
LaMnO 3钙钛矿纳米颗粒是使用溶胶-凝胶法制备的。使用X射线衍射,透射电子显微镜,扫描电子显微镜,能量色散X射线光谱法,BET法和傅里叶变换红外光谱法测定催化剂的物理和化学性质。XRD结果表明LaMnO 3在600℃下具有良好的结晶相。介孔钙钛矿材料(LaMnO 3)的BET表面积为475m 2 / g,孔的平均宽度为8.7nm 。实验数据表明,LaMnO 3颗粒是纳米级的。该钙钛矿型氧化物作为绿色和可重复使用的催化剂显示出优异的催化活性,用于合成咪唑并[1,2- a ]吡啶。LaMnO 3催化剂可以回收并在五个反应周期内重复使用,总TON = 2790和TOF =372。产物是在无溶剂的条件下制备的,不含任何添加剂。这种简单方法的主要特征包括无危险的反应条件,低催化剂负载量和优异的收率。