Synthesis and Characterization of {[Tris(trimethylsilyl)silyl]methyl}silanes of the Formula Type Me4−n Si[CH2Si(SiMe3)3] n (n = 1−3) and Derivatives

In context with systematic studies on multifunctional tetraorganylsilanes of the formula type R4−n Si(CH2X) n (R = organyl, X = functional group, n = 2−4), a series of new (silylmethyl)silanes of the formula types Me4−n Si[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).