In this research, a novel type of Fe₃O₄@silica-supported dendrimer capped by guanidine groups for immobilization of palladium was reported. This novel nano-sized catalyst was characterized by FTIR, TGA, XRD, FESEM, EDX, VSM, XPS and HRTEM methods. Enhanced catalytic activity of the prepared catalyst in Mizoroki-Heck and copper-free Sonogashira coupling reactions were evaluated in water as a green solvent. The influence of the various reaction parameters such as catalyst dosage, time and temperature on two mentioned C–C coupling reactions were studied. Results showed that the catalyst could be easily recovered by simple separation by an external magnet and reused for five cycles of recovery without considerable losing of its activity.

在这项研究中，报道了一种新型的由Fe ₃ O ₄二氧化硅负载的树枝状大分子封端的胍基固定钯。FTIR，TGA，XRD，FESEM，EDX，VSM，XPS和HRTEM方法表征了这种新型纳米催化剂。在水中作为绿色溶剂，评估了制备的催化剂在米佐罗基-赫克中的增强催化活性和无铜Sonogashira偶联反应。研究了各种反应参数（例如催化剂用量，时间和温度）对上述两个CC偶联反应的影响。结果表明，通过外部磁体的简单分离可以很容易地回收催化剂，并在不损失活性的情况下重复使用五个回收周期。