Dinuclear bis-propagators for the stereoselective living coordinative chain transfer polymerization of propene.

Jia Wei, Wonseok Hwang, Wei Zhang, Lawrence R Sita

Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.

Journal of the American Chemical Society 2013 Feb 13

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Modulation of steric interactions remote from the active sites within a series of dinuclear bis-propagators derived from racemic 2-4 was used to attenuate the rate of reversible chain transfer between active transition-metal centers and excess equivalents of inactive main-group-metal alkyl species relative to chain growth propagation, as a strategy for achieving the stereoselective living coordinative chain transfer polymerization of propene to provide isotactic stereoblock polypropene. Under identical conditions, the corresponding mononuclear propagator derived from racemic 1 produced only atactic polypropene.

Citation

Jia Wei, Wonseok Hwang, Wei Zhang, Lawrence R Sita. Dinuclear bis-propagators for the stereoselective living coordinative chain transfer polymerization of propene. Journal of the American Chemical Society. 2013 Feb 13;135(6):2132-5