Structure and electronic properties of Pd(III) complexes

Abstract

Despite the rich chemistry of palladium in oxidation states of 0, +2, and +4, no PdIII coordination compounds have been reported until the 1980s. Moreover, while Pd complexes are among the most commonly used catalysts in organometallic chemistry, the first organometallic PdIII complexes have only been reported in 2006. Since then, a significant number of PdIII complexes have been isolated, characterized, and proposed as active catalytic intermediates in the functionalization of CH bonds, oxidatively induced CC bond formation reactions, as well as radical insertion and addition reactions. This review provides an overview of the synthesis and spectroscopic characterization of mononuclear and dinuclear PdIII complexes. A detailed understanding of the steric and electronic properties of PdIII complexes should provide insight for the development of novel catalysts for multi-electron redox reactions and various organometallic transformations.