bis(cyclopentadienyl)titanium dichloride in diethyl ether (N2); added dropwise a soln. of Mg-compound to a suspn. of Ge-compound and Ti-complex over 15 min; refluxed for 1 h; cooled; added ether; evapd.; distd.;

in diethyl ether (N2); added dropwise a soln. of Mg-compound to a suspn. of Ge-compound at 0°C; stirred for 1 h at 0°C and for 4 h at 20°C; hydrolyzed; extracted with ether; evapd.; dissolved in ether; added a suspn. of LiAlH4; refluxed for 2 h;

phenyl-magnesium bromide in diethyl ether (N2); added dropwise C6H5MgBr to a suspn. of Ge-compound at room temp.; stirred for 15 min; hydrolyzed; pptd.; filtered; extracted with CHCl3; washed with water; dried over MgSO4; evapd.; recrystd. from toluene;

bis(cyclopentadienyl)titanium dichloride in diethyl ether (N2); added dropwise a soln. of Mg-compound to a suspn. of Ge-compound and Ti-complex over 15 min; refluxed for 1 h; cooled; added ether; evapd.; distd.;

hydrogenchloride in diethyl ether (N2); added dropwise a soln. of Mg-compound to a suspn. of Ge-compound at -5°C; stirred for 3 h at 0°C and for 2 h at 20°C; added a 1.4 M ethereal soln. of HCl; stirred for 18 h at 20°C; filtered; extracted with pentane; evapd.; distd.;

in methanol (N2); added a soln. of catechol to soln. of Ge-compound; stirred for 2 h; pptd.; evapd.; washed with ether; dried in vacuo;