Organometallics, 26 (20), 4866 -4868, 2007. 10.1021/om700715s S0276-7333(70)00715-X
Web Release Date: August 21, 2007

Copyright © 2007 American Chemical Society

Bis(methylidene) Complex of Tantalum Supported by a PNP Ligand

Laura C. H. Gerber, Lori A. Watson,* Sean Parkin, Wei Weng, Bruce M. Foxman, and Oleg V. Ozerov*

Department of Chemistry, Brandeis University, MS015, 415 South Street, Waltham, Massachusetts 02454, Department of Chemistry, Earlham College, 801 National West Road, Richmond, Indiana 47374, and Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506

Received July 17, 2007

Abstract:

Reaction of (PNP)Li with TaF5 produces pentagonal-bipyramidal (PNP)TaF4 (2). Alkylation of 2 with MeMgBr allows for the isolation of (PNP)TaMe4 (3). (PNP)TaMe4 (3) evolves thermally and/or photochemically into a bis(methylidene) complex (PNP)Ta(=CH2)2 (4). The identity of the latter has been established by X-ray structural, NMR spectroscopic, and DFT computational studies. It does not appear that 4 possesses agostic interactions in solution.

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