CO Insertion Reactions into the M−OH Bonds of Monomeric Nickel and Palladium Hydroxides. Reversible Decarbonylation of a Hydroxycarbonyl Palladium Complex

Abstract

The monomeric hydroxides M{C6H3-2,6-(CH2PiPr2)2}(OH) (M = Ni, Pd) react with carbon monoxide, giving rise to the binuclear CO2 complexes [M{C6H3-2,6-(CH2PiPr2)2}]2(μ-CO2-κ2C,O) (M = Ni, Pd). The formation of the Pd derivative takes place via the mononuclear species Pd{C6H3-2,6-(CH2PiPr2)2}(COOH), which is stable under a CO atmosphere but reversibly loses CO and H2O on attempted isolation.