Regio- and Stereochemistry in Propylene Polymerization Catalyzed with Bis(phenoxy-imine) Zr and Hf Complexes/MAO Systems

End‐group analyses of the oligo‐ and polypropylenes produced with bis(phenoxy‐imine) Zr and Hf complexes with methylaluminoxane (MAO) indicate that the polymerization is initiated by two consecutive 1,2‐insertions and is terminated by a β‐H transfer following a 2,1‐insertion. Our data indicate that...

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Bibliographic Details
Published in:Macromolecular rapid communications. 2003-10, Vol.24 (15), p.894-899
Main Authors: Makio, Haruyuki, Tohi, Yasushi, Saito, Junji, Onda, Mitsuhiko, Fujita, Terunori
Format: Article
Language:English
Subjects:
Applied sciences
catalysis
Exact sciences and technology
FI catalysts
Organic polymers
phenoxy-imine ligand
Physicochemistry of polymers
poly(propylene) (PP)
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:End‐group analyses of the oligo‐ and polypropylenes produced with bis(phenoxy‐imine) Zr and Hf complexes with methylaluminoxane (MAO) indicate that the polymerization is initiated by two consecutive 1,2‐insertions and is terminated by a β‐H transfer following a 2,1‐insertion. Our data indicate that chain propagation occurs with prevailing 1,2‐regiochemistry but with considerable regioerrors, and with virtually no stereoselectivity. The polymerization of propylene mediated by bis(phenoxy‐imine) Zr and Hf complexes with MAO.
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.200300020