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Solvent-Ligated Copper(II) Complexes for the Homopolymerization of 2-Methylpropene

Authors

  • Yang Li,

    1. Molecular Catalysis, Fakultät für Chemie der Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13473
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  • Lih Ting Voon,

    1. Molecular Catalysis, Fakultät für Chemie der Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13473
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  • Hui Yee Yeong,

    1. Molecular Catalysis, Fakultät für Chemie der Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13473
    2. Lehrstuhl für Makromolekulare Stoffe der Technischen Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13563
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  • Ahmed K. Hijazi Dr.,

    1. Molecular Catalysis, Fakultät für Chemie der Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13473
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  • Narayanan Radhakrishnan,

    1. Department of Polymer Structures, Leibniz-Institut für Polymerforschung Dresden e.V. Hohe Strasse 6, 01069 Dresden (Germany)
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  • Klaus Köhler Prof. Dr.,

    1. Molecular Catalysis, Fakultät für Chemie der Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13473
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  • Brigitte Voit Prof. Dr.,

    1. Department of Polymer Structures, Leibniz-Institut für Polymerforschung Dresden e.V. Hohe Strasse 6, 01069 Dresden (Germany)
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  • Oskar Nuyken Prof. Dr.,

    1. Lehrstuhl für Makromolekulare Stoffe der Technischen Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13563
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  • Fritz E. Kühn Prof. Dr.

    1. Molecular Catalysis, Fakultät für Chemie der Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13473
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Abstract

Copper(II) complexes with weakly coordinating counter anions can be utilized as highly efficient catalysts for the synthesis of poly(2-methylpropene) (“polyisobutene”) with a high content of terminal double bonds. These copper(II) compounds are significantly more active than the manganese(II) complexes described previously, can be applied in chlorine-free solvents such as toluene, are easily accessible, and can be handled at room temperature and in laboratory atmospheres for brief periods, but they are sensitive to excess water, thereby losing their catalytic activity. Replacing the acetonitrile ligands by benzonitrile ligands improves the solubility and catalytic activity in nonpolar and nonchlorinated solvents. However, the benzonitrile copper(II) compounds have lower thermal stability than their acetonitrile congeners.

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