Dinuclear bis-propagators for the stereoselective living coordinative chain transfer polymerization of propene.
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.
Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
Jia
J
Wei
Wonseok
W
Hwang
Wei
W
Zhang
Lawrence R
LR
Sita
D000475:Alkenes / Q000737:chemistry*; D015394:Molecular Structure; D058105:Polymerization; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D013237:Stereoisomerism
D000475:Alkenes; D011108:Polymers; C013658:propylene