Synthesis, characterization and structural study of a phosphonium salt containing the [Pd2Br6]2− ion and its application as a novel, efficient and renewable heterogeneous catalyst for amination of aryl halides and the Stille cross-coupling reaction

Abstract

In this study palladium(II) acetate reacts with a phosphonium salt, [Ph3PCH2C6H4CH2Br]Br, to give [Ph3PCH2C6H4CH2OC(O)CH3]2[Pd2Br6]. Characterization of the obtained compound was performed by elemental analysis, IR, 1H, 31P, 13C NMR and X-ray crystallography. It was found that this compound can act as an efficient catalyst for amination of aryl halides to afford primary amines and satisfactory results were obtained. It has also been successfully employed in the catalytic Stille cross-coupling reaction. The catalyst is easily recoverable and reusable without significant loss of its catalytic activity.