Synthesis of Glycoluril

To a beaker add 20 g of 40 % glyoxal solution, 3.5 mL of conc. HCl, 24 g of urea and 40 mL of water, heat with stirring until no more precipitate forms. Cool down in a freezer, filter and wash with some water. Dry in an oven.

Source

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The solution

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The glycouril precipitated on heating

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