Abstract
Five novel heterogeneous mononuclear complex-anchored Ru(III) have been efficiently sono-synthesized and characterized by utilizing several analytical techniques. The assembled complexes could be utilized as effective, robust and recyclable (up to eight consecutive runs) catalysts for one-pot transformation of a vast array of nitriles and aldehydes to primary amides in H2O under aerobic conditions. Moreover, some unreported di- and tetra-amide derivatives were obtained also under the optimal conditions. The results of ICP/OES analysis demonstrated that there is no detected leaching of the recycled catalyst, which suggests the real heterogeneity of the present protocol. The present Ru-complexes exhibited superiority compared to other reported catalysts for amide preparation in terms of low catalyst load, short reaction time, low operating temperature, no hazardous additives required, and high values of TON (990) and TOF (1980 h−1).
摘要
利用多种分析技术高效地超声合成了五种新型异质单核络合物锚定 Ru(III),并对其进行了表征。在有氧条件下,这些组装好的配合物可作为有效、稳定和可循环(最多可连续运行八次)的催化剂,用于在 H2O 中将大量腈类和醛类化合物一锅转化为伯胺。此外,在最佳条件下还获得了一些未报道过的二酰胺和四酰胺衍生物。ICP/OES 分析结果表明,没有检测到回收催化剂的沥滤现象,这表明本方案具有真正的异质性。与其他已报道的酰胺制备催化剂相比,本发明的 Ru 复合物具有催化剂载量低、反应时间短、操作温度低、无需有害添加剂、TON 值(990)和 TOF 值(1980 h-1)高等优点。