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Compounds of Germanium and Tin, 2l . A Tetraaryldigermene with a Short Germanium‐Germanium Double Bond and a Nearly Planar Environment of Both Germanium Atoms
Author(s) -
Weidenbruch Manfred,
Stürmann Martin,
Kilian Hartmut,
Pohl Siegfried,
Saak Wolfgang
Publication year - 1997
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19971300610
Subject(s) - germanium , chemistry , tin , germane , molecule , crystallography , planar , double bond , cycloaddition , germanium compounds , thermal decomposition , stereochemistry , polymer chemistry , organic chemistry , silicon , computer graphics (images) , computer science , catalysis
Abstract Treatment of GeCl 2 · dioxane with the Grignard reagent RMgBr (R=2‐ t Bu‐4,5,6‐Me 3 C 6 H) furnishes the tetraaryldigermene R 2 GeGeR 2 ( 8 ). X‐ray structure‐analysis of 8 reveals a short GeGe double bond, a nearly planar environment of both germanium atoms and extremely widened CGeC angles of 128°. In solution, 8 dissociates into two germylene molecules R 2 Ge, which can be trapped with oxygen or by [4+1] cycloaddition reactions with 1,4‐dihetero‐1,3‐dienes. A similar cycloadduct of a stannylene wa obtained by thermolysis of (R ′ 2 Sn) 3 (R′=2,4,6‐ i Pr 3 C 6 H 2 ), in the presence of a 1,4‐diazabutadiene and characterized by an X‐ray structure‐analysis.