2-Phenyl-N′-(2-phenylacetyl)acetohydrazide

In the title compound, C16H16N2O2, the N′-acetylacetohydrazide group is approximately planar (r.m.s. deviation = 0.018 Å for the eight non-H atoms) and makes dihedral angles of 81.92 (6) and 65.19 (6)° with the terminal phenyl rings. The phenyl rings form a dihedral angle of 62.60 (7)°. In the crystal, molecules are linked into sheets lying parallel to (001) by N—H⋯O and C—H⋯O hydrogen bonds. One O atom accepts one N—H⋯O and one C—H⋯O hydrogen bond and the other O atom accepts one N—H⋯O and two C—H⋯O hydrogen bonds. The N—H⋯O hydrogen bonds lead to R 2 2(8) loops and the C—H⋯O hydrogen bonds generate R 2 1(6) loops.

In the title compound, C 16 H 16 N 2 O 2 , the N 0 -acetylacetohydrazide group is approximately planar (r.m.s. deviation = 0.018 Å for the eight non-H atoms) and makes dihedral angles of 81.92 (6) and 65.19 (6) with the terminal phenyl rings. The phenyl rings form a dihedral angle of 62.60 (7) . In the crystal, molecules are linked into sheets lying parallel to (001) by N-HÁ Á ÁO and C-HÁ Á ÁO hydrogen bonds. One O atom accepts one N-HÁ Á ÁO and one C-HÁ Á ÁO hydrogen bond and the other O atom accepts one N-HÁ Á ÁO and two C-HÁ Á ÁO hydrogen bonds. The N-HÁ Á ÁO hydrogen bonds lead to R 2 2 (8) loops and the C-HÁ Á ÁO hydrogen bonds generate R 2 1 (6) loops.
Bond lengths (Allen et al., 1987) and angles are within normal ranges.

Experimental
The title compound was prepared by the reaction of 2-phenylacetyl chloride with 2-phenylacetohydrazide in the presence of sodium carbonate in water at 5-10 °C (Magedov & Smushkevich, 1991).

Refinement
All H atoms were located in a difference Fourier map and refined freely with N-H = 0.869 (18)

Figure 2
The crystal structure of the title compound, viewed along the a axis. H atoms not involved in hydrogen bonds (dashed lines) have been omitted for clarity.  (Cosier & Glazer, 1986) operating at 100.0 (1) K. 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.