in tetrahydrofuran to a suspn. of K2(t-BuP)2*0.5THF in THF a soln. of Ph2GeCl2 is dropwiseadded at -40°C with stirring over 10 min, mixt. is stirred for another 30 min (without air and moisture, under Ar); solvent is evapd. in vac., ppt. is dried at 1E-3 Torr and extd. in n-pentane and filtd., filtrates are collected, volume is reduced, cooled to -40°C and filtd., filtrate is cooled and ppt. is sucked off (-78°C), dried in vac., elem. anal.;

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;