Abstract

The bis(isopropylimido) complex [W(μ-NPr i)(NPr i)(NHPr i) 2] 2 was synthesized by reacting W 2(NBu t) 2(NHBu t) 2 with excess Pr iNH 2. The complex, characterized by X-ray crystallography, is a dimer of distorted trigonal bipyramids sharing an edge defined by the unsymmetrical bridging imido ligands. Exchange between the bridging and the terminal imido ligands were observed on the NMR timescale, Δ G ‡ = 14.5 ± 1.0 kcal mol −1. An equilibration process is proposed to account for the fluxional behaviour.

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