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ABSTRACT:Polymerizations of 1,1,2-trimethylsilacyclobutane by phenyllithium and platinum complexes were studied. In polymerization by phenyllithium, the initiation reaction was nucleophilic attack of the carbanion on silicon atom of the silacyclobutane ring proved by the existence of terminal phenyl-silyllinkages in the polymer by 1 H NMR. Ring-opening was regioselective 1 ,4-. Polymers had reasonable molecular weights calculated from the molar ratio of the monomer to the initiator. Polymers with similar molecular weight were obtained even with small amounts of a platinum complex as catalyst. However, signals assignable to the olefinic protons of the polymer terminal were seen in 1 H NMR. Extensive chain transfer seems to have occurred. Number average molecular weight was estimated by 1 H NMR assuming that the polymer chain has one terminal double bond. The polymers obtained by both methods had head to tail regular structure.

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