Subvalent mixed SiGe oligomers: (ClSi)Ge and Cl(MeEtN)SiGe(SiCl).

(ClSi)Ge (1; 91%) is accessible from GeCl, the SiCl/[BuN]Cl silylation system, and excess SiCl. A key intermediate step involves Cl sequestration with AlCl in the course of the reaction between the first-formed germanide [(ClSi)Ge] and SiCl. The related adduct Cl(MeEtN)SiGe(SiCl) (2; quantitative conversion) was prepared either by amine-induced cleavage of 1 or by a bottom-up synthesis starting from GeCl and SiCl.

Tris(trichlorosilyl)tetrelide Anions and a Comparative Study of Their Donor Qualities.

Trichlorosilylated tetrelides [(Cl Si) E] have been prepared by adding 1 equiv of a soluble Cl salt to (Cl Si) Si (E=Si) or 4 Si Cl /GeCl (E=Ge). To assess their donor qualities, the anions [(Cl Si) E] (E=C, Si, Ge) have been treated with BCl , AlCl , and GaCl . Both BCl and GaCl give 1:1 adducts with the anionic centers.