Ethyl 5-amino-3-(pyridin-4-yl)-1-(2,4,6-tri-chlorophenyl)-1H-pyrazole-4- carboxylate dimethyl sulfoxide hemisolvate

Abstract

The asymmetric unit of the title compound,C 17H 13Cl 3N 4O 2·-0.5C 2H 6OS, contains two almost identical mol-ecules and one dimethyl sulfoxide (DMSO-d 6) solvent molecule. The pyrazole ring forms dihedral angles of 54.6 (4) and 80.0 (4)° in one molecule, and dihedral angles of 54.2 (4) and 81.2 (4)° in the other mol-ecule, with the directly attached pyridine and trichloro-phenyl rings, respectively. The dihedral angles of the pyridine and trichlorophenyl rings are 51.2 (4) and 52.0 (4)°, respectively. The crystal packing is characterized by intra- and intermolecular hydrogen bonds. The crystal is a nonmerohedral twin with a contribution of 0.488 (1) for the minor twin component. The terminal ethyl group of one molecule and the S atom of DMSO are disordered over two sites.