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The structure of the title compound {systematic name: 4-[4-(4-chloro­phen­yl)-4-hy­droxy­piperidin-1-yl]-N,N-dimethyl-2,2-di­phenyl­butanamide monohydrate}, C29H33ClN2O2·H2O, has been redetermined at 170 (2) K. The redetermination is of significantly higher precision than the previous structure determination at room temperature and includes the H-atom coordinates that were not included in the previous report [Germain et al. (1977). Acta Cryst. B33, 942–944]. It consists of a piperidin-1-yl ring in a distorted chair conformation, with the N,N-dimethyl-α,α-diphenyl­butyramide and the 4-chloro­phenyl and hy­droxy groups bonded in para positions and an external water mol­ecule within the asymmetric unit. The dihedral angles between the mean plane of the piperidine ring and the 4-chloro­phenyl and two benzene rings are 83.4 (5), 76.4 (2) and 85.9 (2)°, respectively. The two benzene rings are inclined to one another by 50.8 (6)°. In the crystal, mol­ecules are linked by O—H...O and O—H...N hydrogen bonds and weak C—H...O intermolecular interactions, forming an infinite two-dimensional network along [110].
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