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 1,485 ml of dimethylformamide is reacted for 18 hours and 20 minutes at 90°C to 100°C internal temperature (external temperature 155°C), the water of reaction produced being removed continuously by azeotropic circulatory distillation. Water of reaction split off: 110 g (94.0% of theory). Thereafter, the reaction mixture, whilst still hot, is separated by filtration from the potassium chloride produced, the filtrate is concentrated on a rotary evaporator at 100°C in a water pump vacuum and the residue is dried to constant weight at 100°C and 10-1 mm Hg.

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