1,6,7-Trigermabicyclo[4.1.0]hept-3-en-7-yl: The Isolable Bicyclic Germyl Radical

Abstract

The one-electron oxidation reaction of potassium 3,4-dimethyl-1,6,7-tris(tri-tert-butylsilyl)-1,6,7-trigermabicyclo[4.1.0]hept-3-en-7-ide (2-·K+) with tris(pentafluorophenyl)borane in THF results in the formation of stable 3,4-dimethyl-1,6,7-tris(tri-tert-butylsilyl)-1,6,7-trigermabicyclo[4.1.0]hept-3-en-7-yl (3•), representing the first bicyclic germyl radical with the bicyclo[4.1.0]hept-3-ene skeleton. The germyl radical 3• was characterized by X-ray crystallographic analysis as well as ESR spectroscopy, showing that it has a near-planar Ge-radical center.