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Acta Cryst. (2013). E69, o1726-o1727
[ doi:10.1107/S1600536813029590 ]

N-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-di­hydro-1H-pyrazol-4-yl)-2-phenyl­acetamide

M. Kaur, J. P. Jasinski, B. J. Anderson, H. S. Yathirajan and B. Narayana

Abstract: The title compound, C19H19N3O2, crystallizes with two independent mol­ecules (A and B) in the asymmetric unit. In mol­ecule A, the pyrazole ring adopts a slightly disordered half-chair conformation while in B it is planar [r.m.s. deviation = 0.0386 (15) Å]. The dihedral angle between the mean planes of the two phenyl rings is 56.2 (8) in A and 38.2 (3)° in B. The N-phenyl substituent on the pyrazole ring is twisted by 46.5 (2) in A and 58.6 (4)° in B while the extended phenyl ring is twisted by 82.2 (8) in A and 87.5 (9)° in B. The mean plane of the amide group forms an angle of 74.8 (3) in A and 67.7 (1)° in B with respect to the phenyl ring. In addition, the amide group is rotated by 51.4 (1) in A and 53.6 (2)° in B from the the mean plane of the pyrazole ring. In the crystal, the two molecules are linked via N-H...O hydrogen bonds, supported by weak C-H...O inter­actions, forming dimers enclosing an R22(10) ring motif. The dimers are linked via C-H...O inter­actions, forming a three-dimensional structure.


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