Silica-coated nano-Fe<sub>3</sub>
O<sub>4</sub>
-supported iminopyridine palladium complex as an active, phosphine-free and magnetically separable catalyst for Heck reactions
作者:Qiang Zhang、Xin Zhao、Huai-Xin Wei、Ji-Hang Li、Jun Luo
DOI:10.1002/aoc.3608
日期:2017.5
magnetic nanoparticle‐supported iminopyridine palladium complex was successfully prepared by attaching palladium acetate to iminopyridine ligand‐functionalized silica‐coated nano‐Fe3O4. The as‐prepared catalyst was well characterized and was evaluated in Heckreactions in terms of activity and recyclability. It was found to be highly efficient for the reactions of various aryl iodides and aryl bromides
通过将乙酸钯附着在亚氨基吡啶配体官能化的二氧化硅纳米Fe 3 O 4上,成功制备了一种新型的磁性纳米粒子支撑的亚氨基吡啶钯配合物。所制备的催化剂已得到很好的表征,并在Heck反应中就活性和可回收性进行了评估。发现在无磷和惰性无气氛条件下,具有各种吸电子基团的各种芳基碘化物和芳基溴化物与烯烃的反应非常高效。此外,可以使用外部磁体方便地回收催化剂,并且可回收性受Heck反应中的碱影响。当三乙胺作为碱时,该催化剂可重复使用至少六次,而活性没有明显损失。