in pentane byproducts: KCl; to a suspn. of K2(t-BuP)2*0.5THF in n-pentane a soln. of Ph2GeCl2 is dropwise added with stirring at -40°C over 15 min, further stirringfor 30 min in the cold (Ar); ppt. is washed (pentane) twice and filtd., filtrates are collected, volume is reduced in vac., kept at -30°C for 24 h, (t-BuP)2(GePh2)2 is sucked off, solvent. is evapd, residue is dried in vac. and dissolvedin CH3CN, ppt. is washed and dried;