Silyl anions are among the most useful reagents in organosilicon synthesis. The majority of complex silicon compounds such as silenes, silylenes, cyclosilanes, are synthesized using silyl anions. Despite the great potential of functional silyl anions in organosilicon chemistry their number is relatively low, furthermore, the knowledge of their structure and reactivity is very limited. Thus, the synthesis, structure and reactivity of new functional silyl anions is crucial for the development of organosilicon synthesis. 

In this thesis we present the synthesis of novel functional silyl anions, substituted by both electropositive function (geminated dimetallosilanes (R₃Si)₂SiM₂, M = Li, Mg, Zn, Hg) and electronegative function ((R₃Si)₂SiR"M, R" = (CO)Ad, (CO)NMe₂, MeN(CO)But, Cl) that mainly were synthesized by: a) the reaction of geminated dimetallosilanes with organic electrophiles; b) by radical reaction between function-substituted silane and R₂Hg or R₂Zn reagents. In addition, the chemistry of these new compounds and their application in synthesis of new organosilicon compounds is shown.