Molecular and crystal structure of 3,4-dihydroxy-2-Oxo-1-methyl-4-phenylpiperidine

The molecular and crystal structure of 3,4-dihydroxy-2-oxo-1-methyl-4-phenylpiperidine was determined. The crystal is orthorhombic; sp. gr. Pca21; a = 15.764, b = 5.635, and c = 25.536 Å; and Z = 8. The structure was solved by direct methods; R1 = 0.051, for 2643 unique reflections. Symmetry-independent molecules are related by a pseudocenter of symmetry. The piperidine cycle has an asymmetric half-chair conformation. The orientation of substituents is determined. In the crystal, intermolecular OH⋯O hydrogen bonds link the molecules into chains parallel to the Y-axis.