in hexane under N2, slow addn. (with stirring) of a hexane slurry of LiNMe2 to a cooled (ice bath) hexane soln. of AlCl3, reaction mixture was allowed to warm up to room temp., stirred for 10 h; filtration, concn. under reduced pressure, crystn. at -20°C;

in diethyl ether Mixing of AlH3 (ether) with org. compd. in appropriate mole ratio (-50°C) followed by slow react. of components between -20 and -10°C.; Removal of solvent, purifn. of resulting cryst. by sublimation in vac. (30-40°C, E-3 mbar).;