sodium hydroxide in water Addn. of CS2 in portions at 20-30°C to a mixt. of an aq. soln. of several amines and of NaOH (H2O), heating of mixt. (1.5 h, 45-60°C), cooling and then treatment with soln. of ZnCl2.; Filtn. of ppt., washing, and drying.;