Highly dispersed magnetically recoverable carbon based Palladium nanoparticles as a Novel catalyst for room temperature Suzuki reaction

It is well-known that palladium-catalyzed cross-coupling reactions are very important and powerful methodologies in synthetic organic chemistry [1].To improve the catalyst activity and lowering of the reaction temperature many efforts are focused on producing of the electron-rich homogeneous catalysts with special expensive ligands but only a few approaches have been reported for improving heterogeneous Pd-based catalysts, because the electron density of the Pd sites in heterogeneous scale could not be easily modified [2].Saikia and co-workers [3] concluded that the alkali metal hydroxides produced from interaction of water and WERSA act as internal bases to facilitate the Suzuki reactions. Based on this knowledge that introduction of special ligands leading to activation of homogeneous Pd-based catalysts we are interested in enhancing the activity of heterogeneous Pd-based catalysts by increasing their electron density via special amino acid as a novel ligand with high content of heteroatoms and polar medium by using of mixture of metal hydroxides. In this work, an efficient procedure based on amino acid-modified Fe3O4@Carbon magnetic nanoparticles (FCA MNPs) with highly dispersed Palladium nanoparticles (Pd NPs) was reported for room temperature Suzuki reaction. Fe3O4@C (FC) were first prepared by synthesis of Fe3O4 MNPs, and then stabilized by glucose carbonization in a Teflon-lined hydrothermal method. PdII ions was then loaded on amino acid modified surface of FCA MNPs and reduced for achieving the uniformly dispersed Pd NPs. The mixture of metal hydroxides as bases in water as a green non-toxic solvent in presence of FCA-PdX led to an efficient procedure for Suzuki reaction at room temperature.