Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 3 (March 2013)


organic compounds



hg5286 scheme

Acta Cryst. (2013). E69, o402-o403    [ doi:10.1107/S1600536813002341 ]

2-(3,4-Dichlorophenyl)-N-(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)acetamide

A. Mahan, R. J. Butcher, P. S. Nayak, B. Narayana and H. S. Yathirajan

Abstract: In the title compound, C19H17Cl2N3O2, there are three molecules (A, B and C) in the asymmetric unit and each differs in the conformation adopted. As a result of steric repulsion, the amide group is rotated with respect to both the dichlorophenyl and 2,3-dihydro-1H-pyrazol-4-yl rings, making dihedral angles of 44.5 (2) and 56.2 (2)°, respectively in A, 51.1 (2) and 54.1 (2)° in B, and 53.8 (2) and 54.6 (2)° in C. The dihedral angles between the dichlorophenyl and 2,3-dihydro-1H-pyrazol-4-yl rings are 54.8 (2), 76.2 (2) and 77.5 (2)° in molecules A, B and C, respectively, while the 2,3-dihydro-1H-pyrazol-4-yl and phenyl rings make dihedral angles of 45.3 (2), 51.2 (2) and 42.8 (2)°, respectively. In the crystal, two of the molecules are linked through N-H...O hydrogen bonding to an adjoining molecule, forming dimers of the R22(10) type, while the third molecule forms such dimers with itself. C-H...O interactions link the dimers.


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