of several organophosphino‐palladium complexes immobilized on mesoporous silica during the palladium‐catalyzed synthesis of propynone by carbonylative Sonogashira coupling was studied, particularly concerning leaching/redeposition phenomena. The results demonstrated that this cross‐coupling reaction is catalyzed by soluble species. Furthermore, it is shown that the palladium leaching is not initiated
研究了羰基Sonogashira偶联在
钯催化的
丙炔酮合成过程中固定在中孔
二氧化硅上的几种有机膦-
钯配合物的行为,特别是关于浸出/再沉积现象。结果表明,这种交叉偶联反应是由可溶性物质催化的。此外,已表明
钯的浸出不是通过氧化加成步骤引发的,而是由接枝的
配体进行的
钯解配位引发的。尽管存在这种不协调性,回收后催化剂的性能仍然足够。另外,显示出与催化剂制备或反应程序相关的几个参数可减少浸出,从而使
金属污染
水平接近欧洲药品评估机构的建议。