LITHIUM HYDRIDOSILOXYSILYLAMIDES - REACTIONS IN N-OCTANE AND TETRAHYDROFURAN IN PRESENCE OF CHLOROTRIMETHYLSILANE

The hydrido-siloxy-silylamino-silanes (Me3SiO)HSiMefNHSiMe(3)) 1, (Me3 SiO)HSi(NHSiMe3)(2) 2 and (Me3SiO)(2)HSi(NHSiMe3) 3 were prepared by c oammonolysis of the chlorosiloxysilanes (Me3SiO)HSiMeCl and (Me3SiO)(3 -n)HSiCln (n = 1, 2) with chlorotrimethylsilane. The reaction behaviou r of lithiated compounds 1, 2 and 3 has been investigated in n-octane and tetrahydrofuran (THF) in presence of chlorotrimethylsilane. The mo noamide (Me3SiO)HSiMe(NLiSiMe3) and the diamide (Me3SiO)HSi(NLiSiMe3)( 2) react under N-silylation to N-substitution products and under Si-O- bond splitting and LiOSiMe3-elimination to cyclodisilazanes in n-octan e as well as in THE The favour reaction is in THF the N-silylation, in n-octane the formation of cyclodisilazanes. The monoamide gives in n- octane (Me3SiO)HSiMe[N(SiMe3)(2)] 4, [Me(H)Si-NSiMe3](2) 5 (main produ ct) and (Me3SiO)MeSi-N(SiMe3)-Si(H) (Me)-N(SiMe3) 6, in THF as main pr oduct 4 and 5. The diamide reacts in THF to give (Me3SiO)HSi[N(SiMe3)( 2)] (NHSiMe3) 7, mainly (Me3SiO)Hsi[N(SiMe3)(2)](2) 8, [(Me3SiNH)HSi-N SiMe3](2) 9 and (Me3SiNH)HSi-N(SiMe3)-Si(H) [N(SiMe3)(2)] -N(SiMe3) 10 , in n-octane 7, mainly 9 and 10. The N-silylation product (Me3SiO)(2) HSiN(SiMe3)(2) 11 is the main product of the reaction of (Me3SiO)(2)HS i(NLiSiMe3) in THF and in n-octane. A reaction with participation of t he Si-H group is only observed in the case of (Me3SiO)HSiMe(NLiSiMe3). 6 is the product of this reaction.