title: 1-(5-Hydroxy-1-phenyl-3-trifluoromethyl-1H-pyrazol-1-yl)ethanone.
abstract: The crystal structure of the title compound, C(12)H(9)F(3)N(2)O(2), contains two independent mol-ecules in the asymmetric unit. The mol-ecules are chemically identical but exhibit a significant difference in the dihedral angles between the mean planes of the phenyl and pyrazole rings, with values of of 11.62 (13) and 18.17 (11)°. Moreover, the trifluoro-methyl group in one of the mol-ecules shows rotational disorder of the F atoms, with site occupancy factors of 0.929 (6) and 0.071 (6). The hydroxyl group in each of the mol-ecules shows a strong intra-molecular hydrogen bond with the carbonyl O atom, forming a six-membered ring and forcing the formyl group and pyrazole ring to be coplanarshowing C-C-C-O torsion angles of ?0.3(5)o and 0.°. Weak inter-molecular C-H⋯O and C-H⋯F inter-actions contribute to the stabilization of the crystal packing.
authors.affiliation: Depto. de Química - Universidade Federal de Santa Catarina, 88040-900 - Florianópolis, SC, Brazil.
authors.forename: Hugo
authors.initials: H
authors.lastname: Gallardo
authors.forename: Edivandro
authors.initials: E
authors.lastname: Girotto
authors.forename: Adailton J
authors.initials: AJ
authors.lastname: Bortoluzzi