Monomer–Dimer Equilibria in Homo- and Heterodinuclear Cationic Alkylzirconium Complexes and Their Role in Polymerization Catalysis

Authors

  • Dr. Manfred Bochmann,

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    1. School of Chemical Sciences, University of East Anglia, GB-Norwich NR4 7TJ (UK), Telefax: Int. code + (603)259396
    • School of Chemical Sciences, University of East Anglia, GB-Norwich NR4 7TJ (UK), Telefax: Int. code + (603)259396
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  • Simon J. Lancaster

    1. School of Chemical Sciences, University of East Anglia, GB-Norwich NR4 7TJ (UK), Telefax: Int. code + (603)259396
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  • This work was supported by the Science and Engineering Research Council. We thank Dr. S. Holding (RAPRA Technology Ltd.) for GPC molecular weight measurements.

Abstract

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The reactive cationic 14-electron complex 2 is stabilized by formation of methyl-bridged binuclear complexes of type 1 and 3. The compounds are highly active catalysts for the polymerization of ethylene and propylene. As expected for the dissociation equilibrium shown, neutral alkyl metal compounds in excess act as inhibitors; thus, the activity of 3 decreases significantly with increasing AlMe3 concentration.

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