Palladium anchored on guanidine-terminated magnetic dendrimer (G3-Gu-Pd): An efficient nano-sized catalyst for phosphorous-free Mizoroki-Heck and copper-free Sonogashira couplings in water
作者:Esmaeil Niknam、Ali Moaddeli、Ali Khalafi-Nezhad
DOI:10.1016/j.jorganchem.2020.121369
日期:2020.9
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
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。