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À propos de : Bis(methylidene) Complex of Tantalum Supported by a PNP Ligand        

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  • Bis(methylidene) Complex of Tantalum Supported by a PNP Ligand
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  • The rigidity of the PNP ligand enforces the coordination of the phosphine arms to the Ta center and promotes double α-abstraction in (PNP)TaMe4 to yield the novel bis(methylidene) complex (PNP)Ta(CH2)2. The latter is thermally stable and does not appear to contain agostic interactions with the methylidene ligands.
  • Reaction of (PNP)Li with TaF5 produces pentagonal-bipyramidal (PNP)TaF4 (2). Alkylation of 2 with MeMgBrallows 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 latterhas been established by X-ray structural, NMR spectroscopic,and DFT computational studies. It does not appear that 4possesses agostic interactions in solution.
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