REACTION OF TRIFLUOROBORANE, TRIFLUOROPHO SPHANE AND FLUOROSILANES WITH LITHIATED BIS(SILYL)AMINES

Tris(silyl)amines with three different silylgroups (7-10) and a difluo roboryl-bis(di-tert-butylfluorosilyl)amine (11) are prepared in the re action of lithiated bis(silyl)amines (2-6) with fluorosilanes and BF3. In the bulky substituted tris(silyl)amines 9 and 10 a rotational barr ier is observed by NMR-spectroscopy at room temperature. An fluorosily l substituted aminoiminophosphane (12) is obtained in the reaction of lithium-bis(di-tert-butylfluorosilyl)amid (6) with F(2)PNCMe(3)SiMe(3) . The lithiated bis(silyl)amines 5 and 6 react with PF3 to give the PF 2-substituted bis(silyl)amides 13 and 14. Above room temperature 13 fo rms the cyclodiphosphazene (15) and (CMe(3))(2)SiF2.