Nature of the Active Sites in Soluble Ziegler-Polymerization Catalysts Generated from Titanocene Halides and Organoaluminum Lewis Acids

  • J. J. Eisch
  • M. P. Boleslawski
  • A. M. Piotrowski
Conference paper


That the active site in Ziegler-Natta polymerization catalysts is the transition metal-carbon bond receives strong support from the finding that pure transition metal alkyls, such as tetrabenzyltitanium [1], can themselves polymerize ethylene and propylene, even in the complete absence of any main-group alkyl. However, it is also evident that combinations of transition-metal salts or organometallics with main-group alkyls often display greatly enhanced catalytic activity and stereoregular polymerization in such processes [2]. The isotactic polymerization of propylene by TiCl3 and Et2AlCl [3] and the greatly accelerated polymerization of ethylene by Cp2ZrMe2 and (MeAlO)n [4] are cases in point.


Ethylene Polymerization Polymerization Catalyst Titanocene Dichloride Insertion Product Allylation Product 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • J. J. Eisch
    • 1
  • M. P. Boleslawski
    • 1
  • A. M. Piotrowski
    • 1
  1. 1.Department of ChemistryState University of New York at BinghamtonBinghamtonUSA

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