in diethyl ether N2-atmosphere; TaCl5 slow addn. (2 h), stirring (24 h), evapn. (vac.); extg. (C6H6), filtering, evapn. (vac.), sublimation (90°C, 10E-2 mm);

in hexane byproducts: LiCl; (N2); Schlenk technique; TaCl5 was slowly added to stirred suspn. of LiNMe2 (5 equiv.) in hexane at -30°C; stirred at room temp. overnight; volatiles removed (vac.); sublimed (vac., 70°C); sublimed (vac., 90°C); crystd. (Et2O, -30°C); elem. anal.;

in deuterated toluene byproducts: HN(SiMe3)2; 10-23°C; identified by NMR;

in deuterated toluene byproducts: HN(SiMe3)2; 23°C; identified by NMR;

in pentane treatment of Ta complex with Li compd. in pentane; not isolated, NMR;

in hexane to Ta(N(CH3)2)5 in hexane was added t-BuNH2, mixt. was stirred for 60 h; solvent was evapd., residue was sublimed, recrystd. from hexane (-35°C);