Highly Isospecific Polymerization of Propylene with Bis(phenoxy-imine) Zr and Hf Complexes Using iBu3Al/Ph3CB(C6F5)4 as a Cocatalyst

Highly isospecific propylene polymerization was achieved by bis(phenoxy-imine) Zr and Hf complexes combined with iBu3Al/Ph3CB(C6F5)4. Microstructural analyses of the isotactic polymers suggested that the polymerization probably proceeds via a site-control mechanism with a 1,2-insertion of propylene....

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Bibliographic Details
Published in:Chemistry letters 2004-03, Vol.33 (3), p.250-251
Main Authors: Prasad, Aitha Vishwa, Makio, Haruyuki, Saito, Junji, Onda, Mitsuhiko, Fujita, Terunori
Format: Article
Language:English
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Summary:Highly isospecific propylene polymerization was achieved by bis(phenoxy-imine) Zr and Hf complexes combined with iBu3Al/Ph3CB(C6F5)4. Microstructural analyses of the isotactic polymers suggested that the polymerization probably proceeds via a site-control mechanism with a 1,2-insertion of propylene. Among the complexes examined, Hf complex 2 produced the highest tacticity polypropylene ([mmmm] 96.8%, Tm 165.1 °C) that is comparable to that made by the best heterogeneous Ziegler–Natta catalysts.
ISSN:0366-7022
1348-0715
DOI:10.1246/cl.2004.250