Twice silicon-induced C–H activation and tautomerisation of a β-diketiminato ligand and formation of new types of N-heterocyclic silanes

Abstract

Unexpected formation of the novel dianionic N,C-chelate ligand L_D²⁻{HC[C(Me)-NR][C(NHR)=CH]}²⁻ occurs by a twice silicon-assisted C–H bond activation of a terminal methyl group on a β-diketiminato ligand backbone, starting from the corresponding lithium β-diketiminide and silicon tetrabromide to give the new N-heterocyclic dibromosilanes 2 and 3.