SPIONs-bis(NHC)-palladium(II): A novel, powerful and efficient catalyst for Mizoroki-Heck and Suzuki-Miyaura C-C coupling reactions

Abstract

A novel, stable and powerful nano Pd-NHC complex utilizing N-methylimidazole bounded to 1,3,5-triazine-tethered SPIONs (superparamagnetic iron oxide nanoparticles) as a bidentate NHC ligand is reported. This well-defined complex was used as an efficient (NHC)-based catalyst for Mizoroki-Heck and Suzuki-Miyaura cross coupling reactions. These cross coupled products were produced in excellent yields under conventional heating or microwave irradiation at extremely low palladium loading (∼0.002 mol%) with perfect high turnover frequencies (TOFs) (103-106 h -1). Moreover, the catalyst could be quickly and completely recovered by external magnetic field and be reused for seven reaction cycles without any change in catalytic activity. © 2014 Elsevier B.V.