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Solvent‐Ligated Copper(II) Complexes for the Homopolymerization of 2‐Methylpropene
Author(s) -
Li Yang,
Voon Lih Ting,
Yeong Hui Yee,
Hijazi Ahmed K.,
Radhakrishnan Narayanan,
Köhler Klaus,
Voit Brigitte,
Nuyken Oskar,
Kühn Fritz E.
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200701928
Subject(s) - benzonitrile , acetonitrile , chemistry , copper , catalysis , solubility , toluene , nitrile , solvent , inorganic chemistry , manganese , photochemistry , thermal stability , organic chemistry
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.