Abstract The Si-Si bond cleavage reaction of decaisopropylbicyclo[2.2.0]hexasilane with PdCl2(PhCN)2 gave cis- and trans-1,4-dichlorocyclohexasilanes. X-ray crystallography of these products show sterically distorted chair conformations of the Si6 rings. The cis- and trans-cyclohexasilane show rather different absorptions in the UV spectra. By treatment with sodium, both isomers reproduced the bicyclo[2.2.0]hexasilane quantitatively.
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