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Regio‐ and Stereochemistry in Propylene Polymerization Catalyzed with Bis(phenoxy‐imine) Zr and Hf Complexes/MAO Systems
Author(s) -
Makio Haruyuki,
Tohi Yasushi,
Saito Junji,
Onda Mitsuhiko,
Fujita Terunori
Publication year - 2003
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200300020
Subject(s) - methylaluminoxane , imine , polymerization , polymer chemistry , regioselectivity , chemistry , catalysis , metallocene , organic chemistry , polymer
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.