boron trifluoride diethyl etherate in dichloromethane soln. of boron trifluoride etherate is dropwise added to 2,2,2-tris(trimethylgermyl)ethanol in CH2Cl2 at 0°C, stirring for 1 h (N2); aq. is NH4Cl added, extn. (ether), ethereal extracts are washed (H2O, aq. NaCl), dried (MgSO4), concd.; elem. anal.;

in methanol; acetonitrile byproducts: PhCH2CH2COOMe, PhCH2CH(OMe)2; Electrolysis; in MeOH/MeCN (1/9, v/v) + KOH soln. in MeOH, 30 mA/cm**2 with stirring; evapd. dissolved (Et2O), washed (H2O), GC-MS, NMR;

in tetrachloromethane; water Kinetics; aq. soln. containing hydrohalogenic acid and a dried ion-exchange resin are placed in a centrifuge tube, addn. of germanium compd., shaking gently for 24 h at 25°C; resin is sepd. by filteration and shaken with aq. NaOH for 24 h to elute the germanium compd.; the germanium compd. concens. in hydrohalogenic acid and the elute is determined with the ICAP-500;

in tetrachloromethane; water Kinetics; an aliquot of aq. soln. containing varius concens. of hydrohalogenic acid and germanium compd. is shaken with an aliquot of CCl4 for 30 min in a centrifuge tube at 25°C; after phase sepn., the germanium concen. in both the phases is determined with an inductivity coupled argon plasma emission spectrometer;

in tetrachloromethane; water Kinetics; an aliquot of aq. soln. containing varius concens. of hydrohalogenic acid and germanium compd. is shaken with an aliquot of CCl4 for 30 min in a centrifuge tube at 25°C; after phase sepn., the germanium concen. in both the phases is determined with an inductivity coupled argon plasma emission spectrometer;