The X-ray crystal structures of two isomeric cyclotrisilanes, cis–cis-and cis–trans-1,2,3-tri-t-butyl-1,2,3-trimesitylcyclotrisilanes (1a) and (1b), respectively, have been determined; the structure of (1b) reveals that one Si–Si bond is significantly longer than the other two in agreement with the recently reported chelotropy of photo-cleavage of (1b) to give E-and Z-1,2-di-t-butyl-1,2-dimesityldisilenes (2a) and (2b), respectively.
J. C. Dewan, S. Murakami, J. T. Snow, S. Collins and S. Masamune, J. Chem. Soc., Chem. Commun., 1985, 892 DOI: 10.1039/C39850000892
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