Stereo- and Enantioselective Polymerization of Olefins with Homogeneous Ziegler — Natta Catalysts

  • Stephen A. Miller
  • Robert M. Waymouth

Abstract

The cyclopolymerization of 1, 5-hexadiene provides a quantitative method of investigating metallocene structure and catalytic function, as the microstructure of the resulting cyclopolymer is reflective of the chemical and stereochemical events that occur during polymerization. Eleven different zirconocene dichlorides were studied and the properties of the resulting cyclopolymers compared. The catalyst structure was correlated to the diastereoselectivity of the cyclization step in terms of the abundance of cis and trans rings in the polymer. In order of decreasing trans ring percentage the following trend was observed: Cp2ZrCl2 (84%), monoatomic-bridged zirconocenes (77%–70%), diatomic-bridged zirconocenes (69%–65%), non-bridged zirconocenes (44%–34%), and Cp2ZrCl2 (19%). The molecular weights, conversions, yields, and extent of crosslinking are also presented.

Keywords

Toluene Macromolecule Cyclohexane Diene Meso 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • Stephen A. Miller
    • 1
  • Robert M. Waymouth
    • 1
  1. 1.Department of ChemistryStanford UniversityStanfordUSA

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