1-bromo-butane; magnesium in tetrahydrofuran (N2); heated a suspn. of Mg and Ge-compound under stirring to 50-55°C; added dropwise a soln. of n-butyl bromide; refluxed under stirring for 2 h; cooled; added ether; evapd.; distd.;

hydrogenchloride; bis(cyclopentadienyl)titanium dichloride in diethyl ether dropwise addn. of tetrachlorogermanium and butylmagnesium chloride to ether soln. of Ti complex at -78°C over 45 min, warming to room temp. over 45 min, refluxing for 15 h, cooling to 0°C, addn. of aq. HCl over 1 h; sepn. of the prganic layer, extn. of the aq. phase with ether, evapn. ofthe combined organic layers to dryness, filtration (Celite), distilln. under reduced pressure;

in diethyl ether (N2); added dropwise a soln. of C4H9MgBr to a suspn. of Ge-compound at room temp.; stirred for 30 min; hydrolyzed; extracted with ether; washed with water; dried over MgSO4; evapd.;

bis(cyclopentadienyl)titanium dichloride in diethyl ether N2-atmosphere; addn. of 5 equiv BuMgBr to precooled GeCl4 soln. (over 1h, stirring, dry ice/Me2CO bath), slow warming to room temp.; addn. of 2 M HCl, extn. of aq. layer (Et2O), drying of org. layer (MgSO4), solvent removal (reduced pressure), filtration, fractional distn. (reduced pressure); elem. anal.;

benzene Zersetzung des Reaktionsgemisches mit Eis und Eisessig;

in tetrahydrofuran byproducts: LiOSi(CH3)3; a suspn. of germatrane in THF was treated with an excess of n-BuLi in n-hexane at room temp. for 4 h; evap., filtered;

in tetrahydrofuran a suspn. of germatrane in THF was treated with an excess of n-BuLi in n-hexane at room temp. for 4 h;

in tetrahydrofuran (N2); added a soln. of Mg-compound to soln. of Ge-compound at 20°C during 15 min-6 h; added LiAlH4; monitored by GC;

in diethylene glycol dimethyl ether

aluminium trichloride other Radiation; a mixt. of GeCl4 and tetraalkylgermane in presence of AlCl3 as catalystin a Pyrex tube is irradiated with a light stream of argon for 30 min at atmospheric pressure (microwave irradiation: 300 W) (Ar); identification by (1)H-NMR, gas chromy.;