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The kinetics of polymerization of vinyl compounds (acrylonitrile, methacrylonitrile, and methyl methacrylate) with hydridodinitrogentris(triphenylphosphine) cobalt(I), CoH(N2)(PPh3)3 1 (PPh3: triphenylphosphine) was studied. By comparison with previous studies on the decomposition of 1 in the presence of vinyl compound a polymerization mechanism involving slow initiation followed by rapid propagation and unimolecular termination was proposed. The effects of concentration of monomer and of added triphenylphosphine on the molecular weight of the polymer were studied. The result of copolymerization was explained by the competitive coordination between the monomers involved. Poly(methyl methacrylate)s obtained by 1 in bulk and the solvent were all rich syndiotactic fraction.
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Kubo et al. (1974) studied this question.
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