LITHIATED SILOXY-SILYLAMINO-SILANES - PRE PARATION AND REACTIONS WITHCHLORODIMETHYLSILANE

The siloxy-silylamino-silanes (Me(3)SiO)Me(3-n)Si(NHSiMe(3))(n) (1: n = 1, 2: n = 2, 3: n = 3) are obtained by coammonolysis of the chlorosi loxysilanes (Me(3)SiO)Me(3-n)SiCl(n) (n = 1-3) with chlorotrimethylsil ane. The reaction of 1, 2, and 3 with n-butyllithium in appropriate mo lar ratio in n-hexane gives the siloxy-silylamido-silanes (Me(3)SiO)Me (3-n)Si(NLiSiMe(3))(n) (4: n = 1, 5: n = 2, 6: n = 3), which were spec troscopically characterized (IR, H-1-, Li-7-, Si-29-NMR) and allowed t o react in solution (n-hexane, THF) with Me(2)Si(H)Cl. 4 reacts to the N-substitution product (Me(3)SiO)Me(2)SiN(SiMe(3))SiMe(2)H 7, 5 to (M e(3)SiO)MeSi[N(SiMe(3))SiMe(2)H](NHSiMe(3)) 8, (Me(3)SiO)MeSi[N(SiMe(3 ))SiMe(2)H](2) 9 and to the cyclodisilazane (Me(3)SiO)MeSi-N(SiMe(3))- SiMe(2)-N(SiMe(3)) 10. 6 gives in THF the cyclodisilazanes )SiO)[Me(3) SiN(R)]Si-N(SiMe(3))-SiMe(2)-N(SiMe(3)) (11: R = H; 12: R = HMe(2)Si) and iO)[(Me(3)Si)(2)N]Si-N(SiMe(3))-SiMe(2)-N(SiMe(3)) 13, in n-hexane only II in small amounts. An amide solution of 2 with n-butyllithium in the molar ratio 1:1 in n-hexane leads to 8 (main product), 2 and 10 ; in THF 10 and 2 are obtained nearly in same amounts and 8 and 9 as b yproducts. The amide solutions of 3 with n-butyllithium in the molar r atio 1:1 and 1:2, reap., show nearly the same behaviour in n-hexane an d THF. In THF 3, 11, and 12 and in n-hexane 3, 11, 12, and (Me(3)SiO)S i[N(SiMe(3))SiMe(2)H](NHSiMe(3))(2) 14 are formed.