Acetic Acid → 1-Benzyl-5-hydroxyimidazolidine-2,4-dione

関与物質

反応手順

In a solvent mixture of 250 ml of acetic acid and 40 ml of ethyl acetate was dispersed 190 g of 1-benzylhydantoin and the mixture was refluxed under heating with stirring. To the mixture was added dropwise 164 g of bromine over a period of one hour, and the mixture was refluxed under heating for 30 minutes. The solvent was distilled off under a reduced pressure and the residue was allowed to stand for cooling. To the residue were added dropwise an aqueous sodium bicarbonate solution prepared by dissolving 53 g of sodium bicarbonate in 400 ml of water and then 200 ml of water. The reaction vessel was cooled with water and the crystals thus-deposited were collected by filtration, washed with water and dried to obtain 182 g of 5-hydroxy-1-benzylhydantoin as colorless crystals.

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