Synthesis and reactivity of N-aryl substituted N-heterocyclic silylenes

Abstract

N -aryl substituted silylenes of the 2-silaimidazolidene type were synthesized by metal-reduction and their reactivity was studied. The synthesis of two N -aryl substituted 2-silaimidazolidenes 9a , b by metal-reduction of the appropriate silicon(IV) heterocycles is reported. Structural as well as spectroscopic data obtained for the N -aryl substituted N -heterocyclic silylenes (NHSi) are very close to those obtained previously for their N -alkyl substituted counterparts. NHSis 9a , b are used as starting materials for the synthesis of a series of dichalcogenadisiletanes 19 – 24 and for of a mono silylene tungsten complex 29 . The reactivity studies revealed only marginally differences between the N -aryl substituted NHSis 9a , b and previously described N -alkyl substituted silylenes.