rac-syn-Diethyl 2-hy­droxy-4-oxo-1-phenyl­cyclo­hexane-1,2-dicarboxyl­ate

The title compound, C(18)H(22)O(6), was obtained by the domino oxa–Michael–aldol (DOMA) reaction and has the cyclo­hexa­none ring in a chair conformation with intra-annular torsion angles in the range 49.9 (2)–58.9 (2)°. The two eth­oxy­carbonyl substituents on the cyclo­hexa­none ring adopt a syn configurations. In the crystal, the mol­ecules self-assemble through duplex inter­molecular hy­droxy–carbonyl O—H⋯O hydrogen bonds, giving centrosymmetric cyclic dimers [graph set R (2) (2)(12)] which inter-associate through weak C—H⋯O hydrogen-bonding inter­actions.