Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 689, Issue 24, Pages 3982-3998Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2004.07.006
Keywords
catalysis; metallocenes; polymerisation; anion effects; kinetics; stereoselectivity
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The nature of the counteranion is an essential component of metallocene polymerisation catalysts. Detailed mechanistic investigations show how the anion is able to determine the activity and, in many cases, also the stereoselectivity of the catalyst. This review summarises recent advances in mechanistic understanding of well defined metallocene catalysts based on ion pairs [L2ZrR+. . .X-] and describes recent insights in ion mobility and kinetics of alkene polymerisation processes. The interplay of ligand structure and nature of the counteranions demonstrates a fascinating versatility and subtlety that continually challenge our ability to rationalise and predict catalyst performance. (C) 2004 Elsevier B.V. All rights reserved.
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