The activity of palladium nanoparticles supported on poly (N-vinylpyrrolidone) grafted Fe3O4@SiO2 was investigated in the cross-coupling reactions. We have applied this catalyst under low loading of the supported palladium nanoparticles for the coupling of aryl halides with alkenes (Mizoroki–Heck reaction) and organoboronic acids (Suzuki–Miyaura reaction) in the absence of phosphorous ligands. Short reaction times and excellent yields of the products express the effectiveness of this catalyst. The nanocatalyst can be separated from the reaction mixture by applying a permanent magnet externally and can be reused for six times without appreciable change in catalytic activity. Also, the amount of leaching of Pd nanoparticles has been determined by ICP analysis and results showed low leaching of the metal into solution from the supported catalyst.
                                    将
钯纳米颗粒支持在聚(
N-乙烯基吡咯烷酮)接枝的
Fe3O4@SiO2上进行的活性研究了其在交叉偶联反应中的应用。我们在无
磷配体的条件下,使用这种催化剂以低负载的
钯纳米颗粒催化芳基卤化物与烯烃(Mizoroki–Heck反应)和有机
硼酸(Suzuki–Miyaura反应)的偶联。短反应时间和优良的产物收率表明了该催化剂的有效性。该纳米催化剂可以通过外部施加永久磁
铁从反应混合物中分离,并且可以重复使用六次而没有显著的催化活性变化。此外,通过ICP分析测定了
钯纳米颗粒的浸出量,结果显示从支持催化剂中浸出的
金属量很低。