Pd(II)‐Functionalized Polymeric Shell Encapsulated on Magnetite Nanocatalysts for C−C Coupling Reactions

Abstract

AbstractA polymeric network grafted on the magnetite nanoparticles (Fe3O4@PAA−PPh3) were found to aggregate in the form a cotton‐ball like morphology, which exhibited a good loading of Pd(II) generally used as homogeneous catalyst in many coupling reactions. To prepare the Fe3O4@PAA−PPh3 nanoplatform for loading Pd(II), Fe3O4 nanoparticles (NPs) functionalized with amines were coupled to polyacrylic acid (PAA), polyethylene amine (PEI) and triphenyl phosphine (PPh3) sequentially using the HBTU‐DIEA coupling method. The Pd(II)‐loaded Fe3O4@PAA−PPh3 catalyst showed better activity toward the representative Mizoroki‐Heck type coupling reactions. The catalytic activity of Fe3O4@PAA−PPh3 loaded with palladium was compared with the available homogenous and heterogeneous catalyst systems. This comparison seemed to suggest that Pd(II)‐loaded Fe3O4@PAA−PPh3 had higher turnover frequency, which could be a potential alternative to the existingnanoplatforms for loading homogeneous catalysts in terms of not only better turnover number and turnover frequency but also improved recyclability.