可磁性回收钯催化剂的制备及其催化Suzuki偶联反应

Preparation of Magnetically Retrievable Palladium Catalyst and Its Use in Catalytic Suzuki Coupling Reactions

利用淀粉包覆四氧化三铁(Fe_(3)O_(4))内核并负载原位生成零价钯(Pd^((0)))的方法,制备了可磁性回收的钯(Pd)催化剂Fe_(3)O_(4)@Starch-Pd^((0)),研究其催化Suzuki偶联反应制备联苯化合物的性能。结果发现,该催化剂可以在空气氛围内、温和条件下催化系列卤代芳烃和芳基硼酸之间的Suzuki偶联反应。此外,催化剂具有一定的结构稳定性,通过磁性分离后,重复使用4次,催化活性稍有下降。

Magnetically retrievable palladium catalyst,viz.,Fe_(3)O_(4)@Starch-Pd^((0))is prepared through loading the formed Pd^((0))in situ to the Fe_(3)O_(4) nanoparticles,on which is coated with starch layer.Its performance in catalyzing the Suzuki coupling reaction to prepare biphenyl compounds is studied in depth;and it is found that the as-prepared Fe_(3)O_(4)@Starch-Pd^((0))could catalyze the Suzuki coupling reaction of a series of halogenated aromatic hydrocarbons and aryl boronic acids under air atmosphere and mild conditions.In addition,the catalyst is structurally stable,after the easy recovery from magnetic separation,Fe_(3)O_(4)@Starch-Pd^((0))can be reused directly for 4 times with the catalytic activity decreased slightly.