Ultrasound-assisted C–C coupling reactions catalyzed by unique SPION-A-Pd(EDTA) as a robust nanocatalyst
作者:Marzieh Ghotbinejad、Ahmad R. Khosropour、Iraj Mohammadpoor-Baltork、Majid Moghadam、Shahram Tangestaninejad、Valiollah Mirkhani
DOI:10.1039/c3ra45790g
日期:——
A novel and highly stable Pd(EDTA)2â salt was synthesized as a catalyst, using a counter-cation of N-methylimidazolium bonded to 1,3,5-triazine-tethered SPIONs (superparamagnetic iron oxide nanoparticles). This well-defined complex efficiently catalyzed the MizorokiâHeck and SuzukiâMiyaura cross-coupling reactions. The cross-coupled products were produced under conventional heating and ultrasound irradiation at an extremely low catalyst loading (as low as 0.032 mol% Pd). Results indicated that conventional synthesis took longer and gave moderate yields, while in the presence of ultrasound irradiation, the reaction occurred very fast in high to excellent yields. The catalyst could be quickly recovered by an external magnetic field and could be reused for several reaction cycles without any change in catalytic activity.
合成了一种新颖且高稳定性的Pd(EDTA)₂⁻盐作为催化剂,使用了与1,3,5-三嗪连接的SPIONs(超顺磁性铁氧化物纳米粒子)结合的N-甲基咪唑阳离子。该明确定义的配合物有效催化了Mizoroki–Heck和Suzuki–Miyaura交叉偶联反应。交叉偶联产物在常规加热和超声照射下以极低的催化剂负载量(低至0.032 mol% Pd)生成。结果表明,常规合成耗时较长且产率中等,而在超声照射的存在下,反应迅速发生,产率高至优秀。催化剂可以通过外部磁场快速回收,并且可以在多个反应周期中重复使用,而催化活性没有任何变化。