Strukturuntersuchungen an Den Produkten Aus Der Reaktion Des Tris(trimethylsilyl)silyllithiums Mit Aceton

The reaction of (Me3Si)3SiLi (1) with acetone has been clarified with the aid of crystal structure and Si-29 NMR investigations of H(Me3Si)2Si-(Me3Si)2Si-CMe2SiMe3 (3) and (Me3Si)3Si-(Me3Si)2Si-CMe2SiMe3 (4). The chemically but not crystallographically equivalent silicon atoms in 3 and 4 and the two crystallographically independent molecules of 4 all gave rise to separate signals in the solid state Si-29-MAS NMR spectra. The 1J(Si-29, Si-29) couplings observed in solution facilitated the assignment of Si-29 resonances.