Organometallics p. 855 - 857 (1989)
Update date:2022-08-02
Topics:
Van Der Sluys, William G.
Burns, Carol J.
Sattelberger, Alfred P.
The reaction of U(O-2,6-But2C6H3)3 with 3 equiv of LiCH(SiMe3)2 in hexane at ambient temperature provides royal blue U[CH(SiMe3)2]3 (1) in ca. 40% isolated yield. In the solid state, 1 is pyramidal with crystallographically imposed C3 symmetry, a U(1)-C(4) (i.e., U-Cα) bond length of 2.48 (2) A?, and a C(4)-U(1)-C(4′) bond angle of 107.7 (4)°. The molecular structure also features a γ-agostic interaction with three symmetry-related silyl methyl groups [U(1)-C(7) = 3.09 (2) A?]. 1 is thermally stable as a solid at room temperature but decomposes with loss of H2C(SiMe3)2 at ca. 60°C. Solutions of 1 in hexane or THF slowly decompose over the course of several hours. Reaction of UCl3(THF)x with 3 equiv of LiCH(SiMe3)2 in THF does not produce U[CH-(SiMe3)2]3 but rather a green ionic complex of formula [Li(THF)3] [UCl{CH(SiMe3)2}3].
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