The Organometallic Reactivity of High-Valent Pd and Ni Complexes

High-valent Pd and Ni complexes have been proposed to play an important role in a number of C-C and C-heteroatom bond formation reactions. In this context, a series of stable mononuclear Pd(III) and Pd(IV) complexes supported by multidentate N-donor ligands have been synthesized and their oxidative reactivity was investigated. In addition, organometallic Ni(III) and Ni(IV) complexes relevant to cross-coupling reactions have been isolated and their reactivity was studied in detail.  The intermediacy of such high-valent Pd and Ni species in other organometallic reactions will also be discussed.