Preparation and Structure of Two Highly Reactive Intermediates: [Li(thf)4][Cu5Cl4R2] and [Li(thf)4][AlCl3R], R Si(SiMe3)3
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A SiCu2 three-center two-electron bond with short CuCu distance is the prominent structural feature of the lithium silylcuprate Li(thf)4-1 mentioned in the title compound, the first compound of this type characterized by X-ray crystallography (in the picture the SiMe3 substituents have been omitted). The structure of the aluminate corresponds to a frozen intermediate from the reaction of (Me3Si)3SiLi and AlC13. The two compounds are only stable at low temperatures.