palladium dichloride in neat (no solvent) ligand, Ge-compound and PdCl2 were stirred at at room temp. for 4 h under inert atm.; elem. anal.;

aluminum tribromide other Radiation; a mixt. of GeBr4 and tetraphenylgermane in presence of AlBr3 as catalyst in a Pyrex tube is irradiated with a light stream of argon for 7 min at atmospheric pressure (microwave irradiation: 210 W) (Ar); identification by (1)H-NMR, gas chromy.;

in benzene byproducts: ethylene; stirred until complet dissolution of suspn.; distillation at 150°C/0.5 mm Hg;

Bu2Hg in benzene byproducts: mercury, ethylene; 36 h at room temperature, Hg precipitated, immidiate evolution of ethylene after dibromoethane addition; evapn.;

in not given avoiding an excess of BrMgPh;; heterogeneous product mixture obtained;;

in gas vaporization of Ge (alumina-coated tungsten crucible, 1200-1300°C, 5E-3 Torr), introduction into reaction flask (cooled with liq. N2 during Ge vaporization) together with vapor of org. halide, warming to room temp., standing for 1.5 h; GC-MS, GLC;

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in tetrahydrofuran (Ar), cooled to -78°C, stirred for 1.5 h, stirred for 24 h at ambient temp.; filtered, dilution with ether, extracted with aq. HCl, twice with deionized H2O, dried over MgSO4, evaporated solvent, chromy.(silica, hexane; NMR, UV, mass. spectra;

zinc in tetrahydrofuran byproducts: ZnBr2; fast addn. of concd. soln. of Ge halide and a large excess of tetrabromide to a heated suspension of activated Zn; refluxing, 2h;

in tetrahydrofuran; N,N,N',N',N'',N''-hexamethylphosphoric triamide (Ar); soln. of Me3GeCl (2 equiv.) and Ph2GeBr2 (1 equiv.) in THF was added dropwise to soln. of SmI2 (10 equiv.) in THF/hexamethylphosphoric triamide (12/1) for 2 h at room temp.; mixt. was stirred for 1 h; chromd. (silica gel, ether); evapd.; chromd. (silica gel, hexane); elem.anal.;