A tetraaryldigermene with a short germanium-germanium double bond and a nearly planar environment of both germanium atoms

Article abstract of DOI:10.1002/cber.19971300610

Treatment of GeCl₂ ·dioxane with the Grignard reagent RMgBr (R = 2-rBu-4,5.6-Me₃C₆H) furnishes the tetraaryldigermene R₂Ge=GeR₂ (8). X-ray structure-analysis of 8 reveals a short Ge=Ge double bond, a nearly planar environment of both germanium atoms and extremely widened C-Ge-C angles of 128°. In solution, 8 dissociates into two germylene molecules R₂Ge: which can be trapped with oxygen or by [4 + 1] cycloaddition reactions with 1,4-dihetero1,3-dienes. A similar cycloadduct of a stannylene was obtained by thermolysis of (R′₂Sn)₃ (R′ = 2,4,6-JPr₃C₆H₂), in the presence of a 1,4-diazabutadiene and characterized by an Xray structure-analysis. VCH Verlagsgesellschaft mbH.