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Updated: Jul 18, 2026

Paradigms for Pharmacological Characterization of C. elegans Synaptic Transmission Mutants
Published on: August 18, 2008
Stereospecific living Ziegler-Natta polymerization via rapid and reversible chloride degenerative transfer between
Yonghui Zhang1, Lawrence R Sita
1Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
Abstract:
The successful realization of a stereospecific chloride degenerative transfer living Ziegler-Natta polymerization process that provides isotactic polyolefins of narrow polydispersity (Mw/Mn = 1.05) is documented. Variable-temperature NMR studies confirm the configurational stability of all species with respect to metal-centered epimerization and large magnitudes for both kbeta and k-beta. Additional kinetic analyses with an increasing concentration of the dormant state establish that kbeta is larger than k-beta. Finally, [Et3Si][B(C6F5)4] has been shown to be an effective substoichiometric halide abstractor for chloride degenerative transfer Ziegler-Natta polymerization.

