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

  • Stephen A. Miller
  • Robert M. Waymouth


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.


Chain Transfer Catalyst Precursor Catalyst Structure Metallocene Catalyst Olefin Polymerization 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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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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