5,5-Di­chloro-6-hy­droxy­dihydro­pyrimidine-2,4(1H,3H)-dione: mol­ecular and crystal structure, Hirshfeld surface analysis and the new route for synthesis with Mg(ReO(4))(2) as a new catalyst

The mol­ecular and crystal structures of the title compound, C(4)H(4)Cl(2)N(2)O(3), were investigated by single-crystal X-ray diffraction and a Hirshfeld surface analysis. The title compound was synthesized by a new type of reaction using Mg(ReO(4))(2) as a new catalyst and a possible mechanism for this reaction is proposed. The six-membered ring adopts a half-chair conformation. In the crystal, hydrogen bonds connect the mol­ecules into double layers, which are connected to each other by halogen bonds. The Hirshfeld surface analysis revealed that the most important contributions for the crystal packing are from O⋯H/H⋯O (35.8%), Cl⋯Cl (19.6%), Cl⋯H/H⋯Cl (17.0%), H⋯H (8.3%), C⋯O/O⋯C (4.3%), Cl⋯O/O⋯Cl (4.2%) and O⋯O (4.1%) contacts.