n-butyllithium; potassium tert-butylate in pentane under exclusion of air and moisture; addn. of Me2NC2H4 to t-K-butylate and n-BuLi in pentane at -78°C, warming to room temp., after stirring for 12 h cooling to -60°C, addn. of Me3SnCl, thawing, hydrolysis; distillation, elem. anal.;

tert.-butyl lithium in pentane addn. of Me2NC2H4NMe2 at -78°C to tert-BuLi in pentane (10 s), ayellow ppt. is obtained, warming to 25°C (dissolution of ppt.), then cooling to -78°C, addn. of Me3SnCl in pentane, hydrolysis; distn. (bath temp. 70°C/9 Pa), first fraction (39-47°C) contains ethylenediamine-compd. and the dimethylamino-compd. in the ratio53 : 47, the second fraction (49°C) contains only the ethylenediamine-compd., elem. anal.;

n-butyllithium; potassium tert-butylate in pentane byproducts: Sn(CH3)4; under exclusion of oxygen and moisture, reaction of Me2NC2H4NMe2 with two equivalents of n-C4H9Li/tert-BuOK (mixing at -78°C, then warming to room temp.), stirring for 12 h, cooling to -60°C, addn. of Me3SnCl, thawing, hydrolysis; after sepn. of solid a liquid is obtained, removal of solvents, distillation, three fractions (25°C/13-133 Pa, 25°C/0.1 Pa, 70°C/0.1 Pa) with various product ratios are obtained; total yield of H2CC(NMe2)SnMe3 11percent;