Spectroscopic and kinetic study of the homogeneous Pd(CH3COO)(2)-Ph2P(CH2)(3)PPh2-CF3COOH-CH3OH system active for copolymerization of ethylene with carbon oxide

UV and NMR spectra and the kinetics of copolymerization of C2H4 with CO in the catalytic Pd(CH3COO)(2)-Dppp-CF3COOH-CH3OH [Dppp = Ph2P(CH3)(2)PPh2] sy stem were studied. Diphosphine was shown to be capable of substituting step wise for the acetate ions in palladium acetate to form a catalytically acti ve [Pd(CH3COO)Dppp](+) complex that reversibly converts into the inactive c ationic complex [Pd(Dppp)(2)](2+) upon further increase in the Dppp concent ration, thus terminating the copolymerization reaction. In the presence of O-2, Dppp is catalytically oxidized to oxide and affects the copolymerizati on reaction. A relationship between the contents of the cited complexes in the catalytic system and the copolymerization rate and induction period is established.