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'Cyclosilazanes' in keywords Facet   Publication Year 1992  [X]
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1992[X]
1Author    Brigitte Tecklenburg, Uwe Klingebiel, M. Athias, N. Oltem, Eyer+, Dieter Schmidt-Bäse+Requires cookie*
 Title    Tetrafluorcyclodi-und Hexafluorcyclotrisilazane Tetrafluorocyclodi-and Hexafluorocyclotrisilazanes  
 Abstract    Bis(silylamino)difluorosilanes (1,2) are prepared in the reaction o f lithiated di-Je/7-butyl-methyl-and ter/-butyl-dimethylsilylamine with tetrafluorosilane. The dilithium derivative o f 1 reacts with SiF4 to give the tetrafluoro-substituted four-membered (S i -N) ring system [(C M ej^M eSiN-SiFJj (3). Two four-membered rings [(R N -S iF 2)2 (4), (R N -S iF N R S iF 3)2 (5), R = CM e3SiM e2] are obtained in the reaction o f dilithiated 2 with SiF4. The dilithiated silyl-amines and SiF4 also react with formation o f 3 and 4. However, besides 4 the six-membered ring (C M e3SiM e2N -S i F 2)3 (6) is obtained. Crystal structures o f 3, 5, and 6 were determined. A transannular Si • • • Si ring distance o f 237,5 pm is found in 3. 
  Reference    Z. Naturforsch. 47b, 855 (1992); eingegangen am 9. Dezem ber 1991 
  Published    1992 
  Keywords    Cyclosilazanes, Ring Distance Si — Si, Crystal Structure 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0855.pdf 
 Identifier    ZNB-1992-47b-0855 
 Volume    47