Structure and electronic properties of Pd(III) complexes

► Despite the rich chemistry of palladium in the 0, +2, and +4 oxidation states, Pd(III) complexes are less common. ► Pd complexes are among the most widely used catalysts in organic chemistry, yet organometallic Pd(III) complexes have only been reported starting in 2006. ► A number of Pd(III) complexes have been proposed recently as catalytic intermediates in CH functionalization, CC bond formation, and radical reactions. ► This review provides an overview of the synthesis and spectroscopic characterization of mononuclear and dinuclear Pd(III) complexes. ► A detailed understanding of the steric and electronic properties of Pd(III) complexes should provide insight for the development of novel catalysts for various redox reactions.