Synthesis and characterization of new palladium(II) complexes derived from pyridinium ylide and investigation of their catalytic activity

The catalytic complex of palladium is one of the most powerful tools for creating a C-C bond in organic synthesis. As a result, various types of palladium complexes have been developed with different ligands [1]. Herein we used the pyridine ylide as a ligand for synthesis Pd complex. This ylide is capable of forming stable complexes that can be identified by spectroscopic and X-ray crystallographic method . Also they can behave as ambidentate ligands, because the carbanion located at the Cα of the ylide or the enolate oxygen is able to donate electron density to a transition metal [2]. We studied on the catalytic properties of palladium(II) complex with the new pyridinium ylide in Suzuki–Miyaura cross-coupling. Results showed that ylide, with an electron-donating structure, was most efficient and enabled the coupling of various aryl halide with aryl boronic acid in good to excellent yields. The ease of preparation of the ylidic ligand, its high solubility in organic solvents, very low catalyst loading and stability toward air and moisture make it an ideal catalytic system for Suzuki cross-coupling reaction.