Abstract

Unexpected formation of the novel dianionic N,C-chelate ligand LD2- [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 beta-diketiminato ligand backbone, starting from the corresponding lithium beta-diketiminide and silicon tetrabromide to give the new N-heterocyclic dibromosilanes and .

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