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

✍ Scribed by Haruyuki Makio; Yasushi Tohi; Junji Saito; Mitsuhiko Onda; Terunori Fujita

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
141 KB
Volume
24
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

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.

magnified imageThe polymerization of propylene mediated by bis(phenoxy‐imine) Zr and Hf complexes with MAO.

📜 SIMILAR VOLUMES

Ethylene and Ethylene/Propylene Polymeri
Ethylene and Ethylene/Propylene Polymerization Behavior of Bis(phenoxy-imine) Zr and Hf Complexes with Perfluorophenyl Substituents
✍ Sei-ichi Ishii; Rieko Furuyama; Naoto Matsukawa; Junji Saito; Makoto Mitani; Hid 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 118 KB

## Abstract The catalytic properties of bis(phenoxy‐imine) Zr and Hf complexes incorporating perfluorophenyl groups with methylaluminoxane were investigated. The fluorinated complexes produced far higher‐molecular‐weight polyethylenes and ethylene/propylene copolymers with increased activities comp