From α-carbamoyl-α-cyano­oxiranes to 3-halogenopyruv­amides

The crystal structures of the first stable α-diol from the α-halogenopyruv­amide series, 3-chloro-2,2-di­hydroxy-3-phenyl­propan­amide, C9H10­ClNO3, and three products [3-(4-chloro­phenyl)-2-cyano-2,3-epoxy­propan­amide, C10H7­ClN2O2, 3-bromo-2-cyano-2-hydroxy-3-p-tolyl­propan­amide, C11H11Br­N2O2, 3-bromo-2-oxo-3-p-tolyl­propan­amide, C10H10­BrNO2] obtained during the systematic synthesis of α-halogenopyruv­amides are reported. The crystal structures are dominated by hydrogen bonds involving an amide group. The stability of the geminal diol could be ascribed to hydrogen bonds which involve both hydroxyl groups.