Synthesis of 5,5-Diphenylhydantoin

To 50 mL of warm ethanol dissolve 1 g of urea and 2 g of benzil, then add 2 g of potassium hydroxide and reflux for 6 h. Pour the refluxed solution into 70 mL of water and filter, discard the precipitate. Then with stirring add as much of HCI until the pH becomes 4, filter and wash with 50 mL of cold water. Recrystallize in hot ethanol.

Source

Refluxing the mixture

Addition of water

Precipitating the product with HCI

The crude product

The recrystallized product

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