β-Amino- and Alkoxy-Substituted Disilanides

Our recent study on formal halide adducts of disilenes led to the investigation of the synthesis and properties of β-fluoro- and chlorodisilanides. The reaction of the functionalized neopentasilanes (Me Si) SiSiPh NEt and (Me Si) SiSiMe OMe with KO Bu in the presence of 18-crown-6 provided access to structurally related β-alkoxy- and amino-substituted disilanides. The obtained Et NPh Si(Me Si) SiK·18-crown-6 was converted to a magnesium silanide and further on to Et NPh Si(Me Si) Si-substituted ziroconocene and hafnocene chlorides. In addition, an example of a silanide containing both Et NPh Si and FPh Si groups was prepared with moderate selectivity. Also, the analogous germanide Et NPh Si(Me Si) GeK·18-crown-6 could be obtained.