Switching a Catalyst System from Ethene Polymerization to Ethene Trimerization with a Hemilabile Ancillary Ligand

A drastic ligand effect was observed in the catalytic ethene conversion by the substituted mono(cyclopentadienyl)titaniumtrichloride/methylalumoxane (MAO) catalysts shown. The catalyst with R=Me produces polyethene, whereas the catalyst with R=Ph selectively trimerizes ethene to 1‐hexene. This switc...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2001-07, Vol.40 (13), p.2516-2519
Main Authors: Deckers, Patrick J. W., Hessen, Bart, Teuben, Jan H.
Format: Article
Language:English
Subjects:
ethene
homogeneous catalysis
ligand effects
titanium
trimerization
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Summary:A drastic ligand effect was observed in the catalytic ethene conversion by the substituted mono(cyclopentadienyl)titaniumtrichloride/methylalumoxane (MAO) catalysts shown. The catalyst with R=Me produces polyethene, whereas the catalyst with R=Ph selectively trimerizes ethene to 1‐hexene. This switch in catalyst performance appears to be the result of a hemilabile behavior of the cyclopentadienyl ligand with the pendant arene group, involving reversible coordination of the arene moiety.
ISSN:1433-7851
1521-3773
DOI:10.1002/1521-3773(20010702)40:13<2516::AID-ANIE2516>3.0.CO;2-V