Authors Li, Y. ; Voon, L. T. ; Yeong, H. Y. ; Hijazi, A. K. ; Radha Krishnan, N. ; Köhler, K. ; Voit, B. ; Nuyken, O. ; Kühn, F. E.
Title Solvent-ligated copper(II) complexes for the homopolymerization of 2-methylpropene
Date 11.08.2008
Number 16063
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.
Publisher Chemistry - A European Journal
Citation Chemistry - A European Journal 14 (2008) 7997-8003
Tags methylpropene copper homogeneous catalysis polymerization manganese(ii) complexes cationic polymerization catalysts polyisobutenes isobutene polymers anions salts co

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