| Abstract
| - (tBu2MeSi)2SnSn(SiMetBu2)21, prepared by the reaction of tBu2MeSiNa with SnCl2-diox in THFand isolated as dark-green crystals, represents the first example of acyclic distannene with a SnSn doublebond that is stable both in the crystalline form and in solution. This was proved by the crystal and NMRspectral data of 1. Distannene 1 has these peculiar structural features: a shortest among all acyclicdistannenes SnSn double bond of 2.6683(10) Å, a nearly planar geometry around both Sn atoms, anda highly twisted SnSn double bond. The reactions of 1 toward carbon tetrachloride and phenylacetylenealso correspond to the reactivity anticipated for the SnSn double bond. The one-electron reduction of 1with potassium produced the distannene anion radical, the heavy analogue of alkene ion radicals, for whichthe particular crystal structure and low-temperature EPR behavior are also discussed.
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