作者:Manfred Weidenbruch、Axel Lesch、Karl Peters、Hans Georg von Schnering
DOI:10.1016/0022-328x(92)83127-4
日期:1992.1
Photolysis of hexa-t-butylcyclotrisilane (1) in the presence of trimethylsilyl-substituted carbodiimides or ketenimines gives the acyclic compounds 8 and 9 in which the heterocumulene chains are extended by formal insertion of the silanimine moiety (t)Bu2SiNSiMe3 into an NSi bond. The structure of 8 was confirmed by X-ray crystallography. Dimethyl-N-phenylketenimine, on the other hand, reacts with tetra-t-butyldisilene, generated photolytically from 1, in a [2 + 2]-fashion, followed by a 1,4-hydrogen shift and ring closure to provide the tricyclic compound 10. The X-ray structure analysis of 10 reveals a very long SiSi bond distance within the strained four-membered ring.