in ethanol treatment of soln. of tBu2Ge(OEt)2 in EtOH with water, heating for 15 hat 40°C; evapn. in vac., recrystn. of tBu2Ge(OH)2 from CHCl3 at -10°C, size-exclusion chromy. (Sephadex-G20, CH2Cl2) of (tBu2GeOH)2O; elem. anal.;

in ethanol treatment of soln. of tBu2Ge(OEt)2 in EtOH with large excess of water, heating for 15 h at 40°C; evapn. in vac., recrystn. from CHCl3 at -10°C; elem. anal.;