Journal
COORDINATION CHEMISTRY REVIEWS
Volume 253, Issue 15-16, Pages 2082-2097Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2009.02.014
Keywords
Group 4 complexes; Iron complexes; Nickel complexes; Olefins; Polymerization catalysis; Stereoselectivity
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In the last few years remarkable advances have been made in the field of non-cyclopentadienyl complexes as homogeneous olefin polymerization catalysts. In this paper we summarize some recent literature data concerning the stereochemical mechanism of alpha-olefin polymerization promoted by late transition metal systems and bi- and tetra-dentate imine phenolate group 4 metal complexes. NMR analysis of the fine structure of suitably labelled polymers, obtained by using isotopically enriched catalysts or monomers, provided valuable information on the regiochemistry and stereochemistry of the polymerization. In particular, C-13 was introduced in different points of the polymer chain as a sort of magnifying lens to observe fine aspects of the microstructure, and to establish a chronology in the sequence of the monomer insertions. (C) 2009 Elsevier B.V. All rights reserved.
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