5-Benzoyl-4-hydroxy-6-(4-nitrophenyl)-4-trifluoromethyl-3,4,5,6-tetrahydropyrimidin-2(1H)-one monohydrate

The asymmetric unit of the title compound, C18H14F3N3O5·H2O, contains two independent formula units. The two heterocyclic molecules differ in the orientations of the benzoylphenyl group with respect to the tetrahydropyrimidine ring [C—C—C—C torsion angles of 64.5 (3) and 67.1 (3)°]. In both molecules the pyrimidine ring adopts a half-chair conformation. The molecules are linked into a two-dimensional network parallel to (001) by N—H⋯O and O—H⋯O hydrogen bonds.

The asymmetric unit of the title compound ( Fig.1) contains two independent molecules which differ in the orientations of benzoylphenyl group with respect to the tetrahydropyrimidine ring. In both molecules, the pyrimidine ring adopts a half-chair conformation. The bulky substituents on the heterocyclic ring are in trans position, which must be attributed to the steric effect. The dihedral angles between C5-C10 and C12-C17 phenyl rings is 60.0 (1)° and that between C23-C28 and C30-C35 rings is 65.2 (1)°.
The crystal packing shows that the molecules are linked into a two-dimensional network parallel to the (001) by N-H···O and O-H···O hydrogen bonds (Table 1 and Fig. 2).

Refinement
N-and O-bound H atoms were located in a difference map and were refined freely except that the O10-H10A distance was restrained to 0.88 (1) Å and the U iso for O-bound H atoms were set at 1.5U eq (O). C-bound H atoms were placed in calculated positions (C-H = 0.95-1.00 Å) and included in the final cycles of refinement using a riding model, with U iso (H) = 1.2U eq (C). In the absence of significant anomalous scattering effects, Friedel pairs were averaged.  5-Benzoyl-4-hydroxy-6-(4-nitrophenyl)-4-trifluoromethyl-3,4,5,6-tetrahydropyrimidin-2(1H)-one monohydrate

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > 2sigma(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.