(IUCr) Crystallography Journals Online

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Acta Cryst. (2012). E68, o2655-o2656
[ doi:10.1107/S1600536812034368 ]

1-[5-(4-Bromophenyl)-3-(4-fluorophenyl)-4,5-dihydro-1H-pyrazol-1-yl]butan-1-one

H.-K. Fun, W.-S. Loh, M. Sapnakumari, B. Narayana and B. K. Sarojini

Abstract: In the title compound, C₁₉H₁₈BrFN₂O, the benzene rings form dihedral angles of 5.38 (7) and 85.48 (7)° with the mean plane of the 4,5-dihydro-1H-pyrazole ring (r.m.s. deviation = 0.0849 Å), which approximates to an envelope conformation with the -CH₂- group as the flap. The dihedral angle between the benzene rings is 82.86 (7)°. In the crystal, C-HF and C-HO hydrogen bonds link the molecules to form inversion dimers and together these generate chains along [011]. The crystal packing also features C-H [pi] interactions.