Abstract
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 1H, 13C, and 29Si NMR spectra this bicyclic cage-molecule exhibits virtual (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 D3d symmetry 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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