Synthesis and Characterization of {[Tris(trimethylsilyl)silyl]methyl}silanes of the Formula Type Me<sub>4−<i>n</i></sub>Si[CH<sub>2</sub>Si(SiMe<sub>3</sub>)<sub>3</sub>]<sub><i>n</i></sub> (<i>n</i> = 1−3) and Derivatives
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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 (1H, 13C, 29Si). In addition, compounds 6, 7, and 9−11 were structurally characterized by single-crystal X-ray diffraction (7 was studied as the solvate 7·0.46Et2O).
