(<i><sup>t</sup></i><sup></sup>Bu<sub>2</sub>MeSi)<sub>2</sub>SnSn(SiMe<i><sup>t</sup></i><sup></sup>Bu<sub>2</sub>)<sub>2</sub>: A Distannene with a >SnSn< Double Bond That Is Stable Both in the Solid State and in Solution
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(tBu2MeSi)2SnSn(SiMetBu2)2 1, prepared by the reaction of tBu2MeSiNa with SnCl2-diox in THF and isolated as dark-green crystals, represents the first example of acyclic distannene with a SnSn double bond that is stable both in the crystalline form and in solution. This was proved by the crystal and NMR spectral data of 1. Distannene 1 has these peculiar structural features: a shortest among all acyclic distannenes SnSn double bond of 2.6683(10) Å, a nearly planar geometry around both Sn atoms, and a highly twisted SnSn double bond. The reactions of 1 toward carbon tetrachloride and phenylacetylene also correspond to the reactivity anticipated for the SnSn double bond. The one-electron reduction of 1 with potassium produced the distannene anion radical, the heavy analogue of alkene ion radicals, for which the particular crystal structure and low-temperature EPR behavior are also discussed.
