A chemical trick: how to make a digermene from a disilene, formation of 3delta-1,2,3,4-disiladigermetene

Vladimir Ya Lee; Kazunori Takanashi; Masaaki Ichinohe; Akira Sekiguchi

doi:10.1021/ja021480s

A chemical trick: how to make a digermene from a disilene, formation of 3delta-1,2,3,4-disiladigermetene

J Am Chem Soc. 2003 May 21;125(20):6012-3. doi: 10.1021/ja021480s.

Authors

Vladimir Ya Lee¹, Kazunori Takanashi, Masaaki Ichinohe, Akira Sekiguchi

Affiliation

¹ Department of Chemistry, University of Tsukuba, Ibaraki 305-8571, Japan.

PMID: 12785804
DOI: 10.1021/ja021480s

Abstract

The unexpected reaction of tetrakis[di-tert-butyl(methyl)silyl]disilagermirenes (1a and 1b) with GeCl2.dioxane results in the quantitative formation of trans-1,2-dichloro-1,2,3,4-tetrakis[di-tert-butyl(methyl)silyl]-3Delta-1,2,3,4-disiladigermetene, 2, representing the first cyclotetrametallene containing two different heavier group 14 elements and the first digermene incorporated in a four-membered ring. trans-1,2-Dichloro-1,2,3,4-tetrakis[di-tert-butyl(methyl)silyl]-3Delta-1,2,3,4-disilagermastannetene (8), with a Ge=Sn double bond, was also prepared by the reaction of 1 with SnCl2.dioxane. The crystal structure of 2 was established by X-ray crystallography, which showed a folded four-membered ring skeleton with a long Ge=Ge double bond (2.2911(4) A). The structural peculiarities of 2, as well as the possible mechanism of its formation, are also discussed.