Hollow nanoshell-sphere Fe@Fe/Pd reactors: a magnetically recoverable catalyst for the Csp–S cross-coupling reactions in water
作者:Parvaneh Ghaderi-Shekhi Abadi、Ezzat Rafiee、Mohammad Joshaghani
DOI:10.1007/s13738-018-1349-4
日期:2018.7
at presence Fe@Fe/Pd (only 7.3 × 10−5 mmol Pd) catalyst with moderate to high yields in water solvent and mild reaction conditions. After the reaction, the catalyst/product(s) separation could be easily achieved with an external magnet and more than 95% of catalyst could be recovered. The recovered catalyst was characterized by XRD, SEM, EBSD, EDX, and UV–Vis spectra. The Fe@Fe/Pd was reused at least
通过热法合成了中空的Pd–PVP–Fe纳米球和Fe–PVP纳米颗粒催化剂。将两种金属纳米催化剂混合在C sp中在水中温和条件下,二苯二硫与苯乙炔之间的–S交叉偶联反应。结果表明,由于两种催化剂之间的协同作用,双催化体系比单催化体系具有更高的催化效率。将两种金属催化剂的添加顺序调整到偶联反应介质中。因此,获得了各种双催化系统,并通过XRD,SEM,EBSD,EDX,UV-Vis光谱和粒度分析仪对其进行了表征。在特殊的添加顺序下,与其他双催化体系相比,所获得的空心纳米壳球Fe @ Fe / Pd反应器在偶联反应中表现出更高的催化活性。在Fe @ Fe / Pd(仅7.3×10 -5)存在下,由各种二芳基二硫化物和苯乙炔获得的C sp –S偶联产物 在水溶剂中具有中等至高收率,且反应条件温和的催化剂。反应后,使用外部磁体可以轻松实现催化剂/产物的分离,并且可以回收超过95%的催化剂。回收的催化剂