A novel, recoverable magnetic nanocatalyst for Suzuki and Heck coupling reactions has been successfully prepared by immobilizing chitosan-bound 5-bromosalicylaldehyde Pd (II) complex on the surface of a Fe₃O₄ nanoparticle. Structure and composition of the solid catalyst were characterized by Fourier transform infrared (FT-IR), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), inductively coupled plasma atomic emission analysis (ICP-AES), and thermogravimetric analysis (TGA). This nanocatalyst showed high catalytic activity for Suzuki coupling reactions of various aryl halides (I and Br, Cl) and phenylboronic acid in polyethyleneglycol (PEG 400) as an ecofriendly and non-poisonous media. The catalyst also exhibits high activity in a Heck reaction of iodo- and bromoarenes with butylacrylate. Moreover, the nanocatalyst could be separated easily from the reaction mixture by an external magnet and reused four times without obvious loss of catalytic activity.

通过将壳聚糖结合的5-溴水杨醛醛Pd（II）络合物固定在Fe ₃ O ₄的表面上，已成功制备了用于铃木和Heck偶联反应的新型可回收磁性纳米催化剂。纳米粒子。通过傅里叶变换红外（FT-IR），粉末X射线衍射（XRD），扫描电子显微镜（SEM），电感耦合等离子体原子发射分析（ICP-AES）和热重分析来表征固体催化剂的结构和组成（TGA）。该纳米催化剂对聚乙二醇（PEG 400）中的各种芳基卤化物（I和Br，Cl）和苯基硼酸的Suzuki偶联反应具有高催化活性，作为一种环保且无毒的介质。该催化剂在碘和溴代芳烃与丙烯酸丁酯的Heck反应中也表现出高活性。而且，可以通过外部磁体容易地将纳米催化剂与反应混合物分离，并且可以重复使用四次而不会明显降低催化活性。