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ChemInform Abstract The Pt complexes (III) are obtained by the oxidative addition of the CH2-O bond of (II) to (I). The reaction follows second-order kinetics, and the rate does not correlate with solvent polarity though the reaction is faster in hydroxylic solvents. Two probable mechanisms are discussed. (IIIb) is characterized by X-ray diffraction studies (Pbca, Z = 8). The reactions of (IIIb) with MeI or HCl lead to isomeric mixtures; the reaction with HCl is reversed on addition of base. In the reaction with MeI, (Va) is obtained in 95% yield after 16 h at 20 rc C.