sodium hydroxide; sodium tetrahydroborate in ethanol; benzene Te adduct mixed with C6H6/EtOH, NaBH4 soln. in aq. NaOH added dropwise under reflux, Sn educt added quickly, stirred for 5 min; poured into H2O, extd. (ether), dried (Na2SO4), filtered, evapd., recrystd. (hexane); elem. anal.;

ammonia T=-78 - 20°C; Schlenk technique;