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Propylene polymerization with a bisiminepyridine iron complex: activation with Ph3C[B(C6F5)4] and AlR3; iron hydride species in the catalytic cycle

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Babik,  S. T.
Research Department Fink, Max-Planck-Institut für Kohlenforschung, Max Planck Society;
Research Department Fink, Max-Planck-Institut für Kohlenforschung, Max Planck Society;
Research Department Fink, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Fink,  G.
Research Department Fink, Max-Planck-Institut für Kohlenforschung, Max Planck Society;
Research Department Fink, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Babik, S. T., & Fink, G. (2002). Propylene polymerization with a bisiminepyridine iron complex: activation with Ph3C[B(C6F5)4] and AlR3; iron hydride species in the catalytic cycle. Journal of Molecular Catalysis A-Chemical, 188(1-2), 245-253. doi:10.1016/S1381-1169(02)00340-0.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-9993-F
Abstract
In this work, the complex 2,6-bis [1-(2-isopropyl-6- methylphenylimino)ethyl]-pyridineiron(II)dichloride was used for propylene polymerization. Activation with Ph3C [B(C6F5)(4)] and subsequent treatment with triisobutylaluminium or triethylaluminium generated a very active polymerization catalyst for propylene, The kinetics of this polymerization reaction were investigated with mass-flowmeters. Further we show propagation-time-profiles of this reaction. Depending on the nature of the aluminiumalkyl we are able to determine different aliphatic endgroups in the polymer using C-13 NMR spectroscopy. Addition of hydrogen to the polymerization leads to higher activities and allows us to formulate a complete catalytic reaction cycle containing an iron hydride species, This cycle comprises one starting cycle and two propagation cycles which can be controlled with the aluminiumtrialkyl- propylene ratio. (C) 2002 Elsevier Science B.V. All rights reserved.