Synthesen und Strukturen der sterisch überladenen Disiloxane und Disilazane (tBu3 Si)2O, (tBu3Si)2NH, (tBu3SiNHSitBu2)2O [1]

Hexa-terf-butyldisiloxane (tBu3Si)2O (2), hexa-rerr-butyldisilazane (tBu3Si)2NH (3), and the disiloxane (tBu3SiNHSuBu2)2O (4) are prepared from bis(silyl)triazene tBu3SiN=N-NHSirBu3 by reaction with water (2) and by thermolysis (3), or from silanimine tBu2Si=NSirBu3 by reaction with water (4). Structures of 2-4 have been determined by X-ray crystallography (for data cf. Tables II). As a consequence of the bulkiness of the silyl groups, the heavy atom frameworks SiOSi in 2 and 4 are linear, and the SiNSi angles in 3 (167 ± 2°) and 4 (157.1°) are comparatively large.