反应详情

60 g of hydrazodicarboxamide and 56 g of n-hexylamine in 100 ml of N-methylpyrrolidone are stirred at 150° C. for 6 hours, at 175° C. for 20 hours and at 180° C. for 20 hours. The solvent is then distilled off in vacuo and the residue is triturated with 100 ml of 10% strength sodium hyroxide solution. The precipitate is filtered off and the filtrate is neutralised with 10% strength hydrochloric acid. A precipitate thereby separates out, and is filtered off, washed with water and dried in vacuo. 75 g (81% of the theoretical yield) of 4-(n-hexyl)-1,2,4-triazolidine-3,5-dione are obtained as colourless crystals of melting point 144°-145° C.

1. distillationThe solvent is then distilled off in vacuo
2. customthe residue is triturated with 100 ml of 10% strength sodium hyroxide solution
3. filtrationThe precipitate is filtered off
4. filtrationis filtered off
5. washwashed with water
6. customdried in vacuo