Add time:07/15/2019         Source:sciencedirect.com

The monomer, 1-methylcyclobutene I can be polymerized by a number of well-defined alkylidene complexes of the type M(CH(CH3)2R)(NAr) (OC(CH3)itn (CF3)3-n)2 (where Ar = 2,6-diisopropylphenyl) to give highly stereoregular polyisoprenes. Only II (where M = Mo; R = Ph; n = 2) catalyzes the polymerization of 1-methylcyclobutene stereospecifically to give polymers with exclusively cis and 100% head-to-tail configuration. We attribute this high degree of selectivity to a fine balance between the electrophilicity of the metal center and steric interactions involving the approach of the monomer to the catalyst.

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