Synthesis and Structure of a Manxane-Cage Silazane Molecule
نویسندگان
چکیده
Michael Baier, Peter Bissinger, Hubert Schmidbaur* Anorganisch-chemisches Institut der Technischen Universität München, Lichtenbergstraße 4, D-85747 Garching, Germany Dedicated to Professor Dr. Dr. h. c. mult. E. O. Fischer on the occasion o f his 75. birthday Z. Naturforsch. 48b, 1672-1674 (1993); received July 11, 1993 Silazanes, Cage-Type, Silicon-Nitrogen Compounds The reaction of tris(chlorodimethylsilyl)methane HC(SiMe2Cl)3 (1) with dry ammonia in hexane leads to the tris(disilazane) molecule HC(Me2SiNHSiMe2)3CH (3) in satisfactory yields. According to its 'H, 13C, and 29Si NMR spectra this bicyclic cage-molecule_exhibits vir tual (time-averaged) D3h symmetry. In the crystal (rhombohedral, space group R3) the manxane-type structure has a crystallographic three-fold axis, but the structure obeys only D 3d sym metry to a good approximation, owing to a disrotatory twist of the two Si3 triangles against each other. The crystals of compound 3 are isomorphous with those of the analogous tris(disiloxane) 2.
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