Synthesis And Characterization Of {[Tris(Trimethylsilyl)Silyl]Methyl}Silanes Of The Formula Type Me4-Nsi[Ch2si(Sime3)(3)](N) (N=1-3) And Derivatives

In context with systematic studies on multifunctional tetraorganylsilanes of the formula type R4-nSi(CH2X)(n) (R = organyl, X = functional group, n = 2-4), a series of new (silylmethyl)silanes of the formula types Me4-nSi[CH2Si(SiMe3)(3)](n) [n = 1 (5), n = 2 (6), n = 3 (7)] and Me3-n(TMOP)Si[CH2Si(SiMe3)(3)](n) [TMOP = 2,4,6-trimethoxyphenyl, n = 1 (9), n = 2 (10)] was synthesized by treatment of the corresponding (chloromethyl)silanes with [tris(trimethylsilyl)silyl]potassium-18-crown-6 (12). Reaction of tetrakis(chloromethyl)silane (4) with 12, however, yielded the unexpected disilacyclobutane derivative 1,1-bis(trimethylsilyl)-3,3-bis{[tris(trimethylsilyl)silyl]methyl}-1,3-disilacyclobutane (11). Compounds 5-7 and 9-11 were characterized by elemental analyses (C, H) and NMR spectroscopic studies in solution (H-1, C-13, Si-29). In addition, compounds 6, 7, and 9-11 were structurally characterized by single-crystal X-ray diffraction (7 was studied as the solvate 7.0.46Et(2)O).