Synthesen und Kristallstrukturen der Lithierten Silylphosphane (CMe3)2SiFP(Mes)Li(THF)3, (CMe3)2SiFLi(TMEDA)PMes und des Cyclischen Silylphosphanes [(CMe3)2SiPMes]2
- 1 December 1989
- journal article
- research article
- Published by Taylor & Francis in Phosphorus, Sulfur, and Silicon and the Related Elements
- Vol. 46 (3-4) , 183-196
- https://doi.org/10.1080/10426508909412064
Abstract
Di-tert-butyldifluorsilne reacts with lithiated 2,4,6-trimethylphenylphosphane to give (CMe3)2SiFPHC6H2Me3 (1). A lithium derivative is formed in the reaction of 1 with nC4H9Li. The crystal structures of the lithium derivatives (CMe3)2SiFP(C6H2Me3)Li(THF)3 (2) and (CMe3)2SiFLi(TMEDA)PC6H2Me3(3) were determined. The phosphorus atom is planar in 2 and pyramidal in 3. A (SiPLiF)-four-membered ring is formed in 3. LiF-elimination leads to the formation of the (SiP)-four-membered ring (4). The ring system of 4 is completely asymmetrical, indicating that the sterical limits of the dimerisation of the intermediate silaphosphene have been reached. Both 2 and 3 react with CMe3SiF3 to give the substituted compound (CMe3)2SiFP(SiF2CMe3)C6H2 Me3 (5).Keywords
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