, "Preparation and polymerization of 3-methylenecyclobutene and of 1-methyl-3-methylenecyclobutene." (1971 In contrast to 3-methylenecyclobutene , l-methyl-3-methylenecyclobutene polymerized readily with cationic initiators to produce unusually high molecular weight polymers in high conversions. On the basis of both IR and NMR spectroscopic analyses, it was concluded that the polymers also contain essentially 1,5 -addition repeating units. Poly-l-methyl-3-methylenecyclobutene was observed to be more stable than poly-3-methylenecyclobutene to hydrogenation , autoxidation and crosslinking reactions.Anionic initiators such as n-BuLi were unable to induce polymerization of l-methyl-3-methylenecyclobutene .
Polymerization byZiegler-Natta catalysts proceeded readily to yield polymers virtually identical to those obtained from cationic initiators.
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