Tetrafluorcyclodi- und Hexafluorcyclotrisilazane / Tetrafluorocyclodi- and Hexafluorocyclotrisilazanes
1992; De Gruyter; Volume: 47; Issue: 6 Linguagem: Inglês
10.1515/znb-1992-0615
ISSN1865-7117
AutoresBrigitte Tecklenburg, Uwe Klingebiel, Mathias Noltemeyer, Dieter Schmidt‐Bäse,
Tópico(s)Fluorine in Organic Chemistry
ResumoBis(silylamino)difluorosilanes (1,2) are prepared in the reaction of lithiated di-tert-butylmethyl- and tert-butyl-dimethylsilylamine with tetrafluorosilane. The dilithium derivative of 1 reacts with SiF 4 to give the tetrafluoro-substituted four-membered (Si-N) ring system [(CMe 3 ) 2 MeSiN-SiF2] 2 (3). Two four-membered rings [(RN-SiF 2 ) 2 (4), (RN-SiFNRSiF 3 ) 2 (5), R=CMe 3 SiMe2] are obtained in the reaction of dilithiated 2 with SiF 4 . The dilithiated silylamines and SiF 4 also react with formation of 3 and 4. However, besides 4 the six-membered ring (CMe 3 SiMe 2 N-SiF 2 ) 3 (6) is obtained. Crystal structures of 3,5, and 6 were determined. A transannular Si ··· Si ring distance of 237,5 pm is found in 3.
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