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'Aminofluorosilanes' in keywords
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1987 (1)
1980 (1)
1Author    D. Ietm Ar Stalke, Nayla Keweloh, Uwe Klingebiel, M. Atthias, N. Oltem Eyer, G. Eorge, M. SheldrickRequires cookie*
 Title    Von lithiierten Aminofluorsilanen zu mono-und dimeren Iminosilanen From Lithiated Aminofluorosilanes to Mono-and Dimeric Iminosilanes  
 Abstract    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-terr-butyl(/m-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(trwm-butylphenyl-imino)silane, for which the crystal structure analysis shows severe steric distortions. Fluorine-chlorine-exchange occurs in reactions of lithiated (tri-fm-butylphenylimino)fluorosilanes with Me3SiCl. Iminosilanes are obtained by thermal LiCl-elimination from the resulting salts. 
  Reference    Z. Naturforsch. 42b, 1237—1244 (1987); eingegangen am 4. Mai/25. Juni 1987 
  Published    1987 
  Keywords    Aminofluorosilanes, Lithium Salts, Cyclisation, Iminosilanes, Crystal Structure 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-1237.pdf 
 Identifier    ZNB-1987-42b-1237 
 Volume    42 
2Author    Uwe Klingebiel, Jutta NeemannRequires cookie*
 Title    .3-Silylgruppenwanderung und gehinderte Si-N-Bindungsrotation Aminofluorosilanes: 1,3-Migration of Silyl Groups and Si-N-Rotational Barrier  
 Abstract    with bulky amino groups are prepared by the reaction of bis-(organyl-trimethylsilyl)amino-difluorosilane8 with lithiated amines. A 1,3-migration of trimethylsilyl groups from bulky alkylamino substituents to arylamino substituents is observed in these reactions. Structural isomers of the new triaminofluorosilanes were isolated. The silyl group migration depends on steric and electronic effects. Further reactions of the triaminofluorosilanes with butyllithium and trifluoroorganylsilanes lead to the formation of difluorosilyl-substituted triaminofluorosilanes and LiF. The symmetric compounds show AB-systems for the fluorine atoms of the difluorosilyl groups in the low temperature 19 F NMR Spectra, due to hindered rotation about the Si-N-bond. The coalescence temperature depends on the bulkiness of the substituents and is observed at or about room temperature. 
  Reference    Z. Naturforsch. 35b, 1155—1161 (1980); eingegangen am 24. Januar/13. März 1980 
  Published    1980 
  Keywords    Aminofluorosilanes, Structural Isomers, Silyl Group Migration, Rotational Barrier, NMR Spectra Triaminofluorosilanes 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1155.pdf 
 Identifier    ZNB-1980-35b-1155 
 Volume    35