5,5-Dihydroxybarbituric acid 1,4-dioxane hemisolvate

Abstract

The asymmetric unit of the title compound,, C4H4N2O5·0.5C4H8O2, contains one molecule of 5,5-dihydroxybarbituric acid with a nearly planar barbiturate ring and half a molecule of 1,4-dioxane. The geometry of the centrosymmetric dioxane molecule is close to an ideal chair conformation. The crystal structure exhibits a complex three-dimensional hydrogen-bonded network. Barbiturate molecules are connected to one another via N—H...O=C, O—H...O=C and N—H...O(hydroxy) interactions, while the barbituric acid molecule is linked to dioxane by an O—H...O contact.