111203-04-4Relevant articles and documents
From Lithiated Aminofluorosilanes to Mono- and Dimeric Iminosilanes
Stalke, Dietmar,Keweloh, Nayla,Klingebiel, Uwe,Noltemeyer, Matthias,Sheldrick, George M.
, p. 1237 - 1244 (2007/10/02)
Depending on the solvent and the bulkiness of the substituents, lithiated aminofluorosilanes are dimers, monomers, or LiF-adducts of iminosilanes.In the crystal structure of the dimeric lithium derivative of di-tert-butyl(tert-butylamino)fluorosilane, each lithium atom is coordinated by one fluorine and two nitrogen atoms.LiF-elimination leads - if sterically possible - to dimerisation.The limits of dimerisation are reached with the dimer diisopropyl(tri-tert-butylphenylimino)silane, for which the crystal structure analysis shows severe steric distortions.Fluorine-chlorine-exchange occurs in reactions of lithiated (tri-tert-butylphenylimino)fluorosilanes with Me3SiCl.Iminosilanes are obtained by thermal LiCl-elimination from the resulting salts. - Keywords: Aminofluorosilanes, Lithium Salts, Cyclisation, Iminosilanes, Crystal Structure