Abstract

Palladium complexes are among the most commonly used catalysts in organometallic chemistry. While the chemistry of Pd in oxidation states 0, +2, and +4 has been extensively studied, much less is known about the reactivity of PdIII complexes, and only a limited number of isolated organometallic PdIII complexes have been reported to date. In addition, various PdIII species have been proposed as active intermediates in oxidative C–H functionalization and oxidatively induced C–C bond formation reactions, Pd‐mediated aerobic transformations, and radical insertion and addition reactions. Presented herein is an overview of the reactivity of mononuclear and dinuclear PdIII complexes and their demonstrated or proposed involvement in various C–C and C–heteroatom bond formation reactions. Overall, the intermediacy of PdIII complexes in a variety of Pd‐mediated transformations may be more common than previously anticipated.

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