Octakis[(2,2,6,6-tetramethylpiperidino)methyl]octasilsesquioxane: synthesis and crystal structure analysis of a new aminoorganyl-functionalized octasilsesquioxane

Octakis[(2,2,6,6-tetramethylpiperidino)methyl]octasilsesquioxane (1), an aminoorganyl-functionalized octasilsesquioxane, was synthesized by hydrolysis of bis[ethane-1,2-diolato(2-)][(2,2,6,6-tetramethylpiperidinio)methyl]silicate (2). The zwitterionic pentacoordinate silicate 2 was obtained by treatment of dimethoxy(methyl)[(2,2,6,6-tetramethylpiperidino)methyl]silane (3) with two molar equivalents of ethane-1,2-diol. The cage-like compound 1 was structurally characterized by single-crystal X-ray diffraction and solution and solid-state NMR spectroscopy.