1,2-Dichloroethane → 3-(2-Chloroethyl)-5,5-dimethylimidazolidine-2,4-dione

関与物質

反応手順

A mixture of 1,664 g of 5,5-dimethyl-hydantoin (13.0 mols), 897 g of anhydrous potassium carbonate (6.5 mols), 5,148 g of 1,2-dichloroethane (52 mols) and 1,458 ml of dimethylformamide is reacted for 18 hours and 20 minutes at 90° C to 100° C internal temperature (external temperature 155° C), whilst constantly removing the resulting water of reaction by azeotropic circulatory distillation. Water of reaction eliminated: 110 g (94.0% of theory). Thereafter the reaction mixture, whilst still hot, is separated by filtration from the potassium chloride produced, the filtrate concentrated on a rotary evaporator at 100° C and the residue is dried to constant weight at 100° C and 10-1 mm Hg.

情報源と証拠