Dinuclear Bis-Propagators for the Stereoselective Living Coordinative Chain Transfer Polymerization of Propene
2013
Wei, Jia | Hwang, Wonseok | Zhang, Wei | Sita, Lawrence R.
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.
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