Bis(carbene)pyridine Complexes of the Early to Middle Transition Metals:  Survey of Ethylene Oligomerization and Polymerization Capability

Bis(carbene)pyridines of the type 2,6-bis(1-(alkyl/aryl)imidazol-2-ylidene)pyridine have been complexed to Ti, V, Cr, Fe, and Co and single-crystal X-ray structures obtained for two of the complexes (M = Cr, Fe). The structures confirm the tight chelate bite angles (ca. 76−79°) enforced by this liga...

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Bibliographic Details
Published in:Organometallics 2004-12, Vol.23 (26), p.6288-6292
Main Authors: McGuinness, David S, Gibson, Vernon C, Steed, Jonathan W
Format: Article
Language:English
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Summary:Bis(carbene)pyridines of the type 2,6-bis(1-(alkyl/aryl)imidazol-2-ylidene)pyridine have been complexed to Ti, V, Cr, Fe, and Co and single-crystal X-ray structures obtained for two of the complexes (M = Cr, Fe). The structures confirm the tight chelate bite angles (ca. 76−79°) enforced by this ligand. All complexes have been evaluated as catalysts for ethylene oligomerization and polymerization in combination with a variety of cocatalysts. While Ti and V complexes of this ligand give rise to highly active ethylene polymerization catalysts, Cr complexes produce exceptionally active Schulz−Flory oligomerization catalysts in combination with MAO. In contrast, complexes of Fe and Co are inactive, and possible reasons for this are suggested.
ISSN:0276-7333
1520-6041
DOI:10.1021/om049246t