BENZODISELENAGERMOLES AND SPIROBISBENZODISELENAGERMOLES

Synthesis of benzodiselenagermoles and bisbenzodisenlenagermoles was c arried out by transmetallation group 4 --> group 14 between diselenoph enylenezirconocenes and dialkyl-, diaryl- or alkylaryldichlorogermanes , aryltrichlorogermane or germanium tetrachloride. The new compounds w ere studied by H-1, Se-77 NMR and mass spectrometry. In the case of co mpounds with substituted phenyl groups, double irradiation and 2D NMR experiments were performed to determine the chemical shifts of the two selenium atoms. The crystal structure of a spirobisbenzodiselenagermo le has been established by X-ray diffraction analysis.