Preparation and properties of tantalum and tungsten multiple imido compounds with pentamethylcyclopentadienyl ligands
AdvisorWigley, David E.
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PublisherThe University of Arizona.
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AbstractThe synthesis, characterization, and reactivity of three-fold (1σ, 2π) donor complexes of tungsten and tantalum have been explored. (η⁵-C₅Me₅)W(=NAr)₂Cl (1) has been prepared from the reaction of W(=NAr)₂Cl₂(THF)₂ with Li(C₅Me₅). Complex 1 can be functionalized by sigma-donor ligands, but 1 reacts with 1σ, 1π donors such as 2,6-diisopropylphenylamide to give the intramolecular C-H bond activated product, (η⁵-C₅Me₄CH₂)W(=NAr)₂(5). [(η⁵-C₅Me₅)Ta(=NAr)₂Cl)]⁻ was synthesized by reacting (η⁵-C₅Me₅)TaCl₄ or (η⁵-C₅Me₅)Ta(NAr)Cl₂ (6) with excess of 2,6-diisopropylphenylamide. The mechanism of formation of [(η⁵-C₅Me₅)Ta(=NAr)₂Cl)]⁻ was investigated. Structures of (η⁵-C₅Me₅)W(=NAr)₂Cl (1) and [Li(OEt₂)][(η⁵-C₅Me₅)Ta(NAr)₂Cl] (7) are reported.
Degree ProgramGraduate College