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(tBu2MeSi)2SndSn(SiMetBu2)2: A Distannene with a >SndSn< Double Bond That Is Stable Both in the Solid State

Summary: (tBu2MeSi)2SndSn(SiMetBu2)2: A Distannene with a >SndSn<
Double Bond That Is Stable Both in the Solid State
and in Solution
Vladimir Ya. Lee, Tomohide Fukawa, Masaaki Nakamoto, Akira Sekiguchi,*,
Boris L. Tumanskii, Miriam Karni, and Yitzhak Apeloig
Contribution from Department of Chemistry,Graduate School of Pure and Applied Sciences,
UniVersity of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan, and Department of Chemistry,
Technion-Israel Institute of Technology, Haifa 32000, Israel
Received May 12, 2006; E-mail: sekiguch@staff.chem.tsukuba.ac.jp
Abstract: (tBu2MeSi)2SndSn(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 SndSn 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 SndSn double bond of 2.6683(10) , a nearly planar geometry around both Sn atoms, and
a highly twisted SndSn double bond. The reactions of 1 toward carbon tetrachloride and phenylacetylene
also correspond to the reactivity anticipated for the SndSn 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.
The distannenes, that is, the compounds featuring SndSn


Source: Apeloig, Yitzhak - Department of Chemistry, Technion, Israel Institute of Technology


Collections: Chemistry