Acta Cryst. (2009). E65, o981-o982  [ doi:10.1107/S160053680901232X ]

Ethyl 4-(2,4-difluorophenyl)-6-methyl-1-phenyl-2-thioxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate

H.-K. Fun, S. R. Jebas, M. Babu and B. Kalluraya

Abstract: The asymmetric unit of the title compound, C₂₀H₁₈F₂N₂O₂S, contains four independent molecules, two of which are paired into a dimer by way of two N-HS hydrogen bonds. The other two independent molecules are paired into two centrosymmetric dimers via pairs of intermolecular N-HS hydrogen bonds. In one molecule, the carboxylate O atoms, methylene and methyl groups attached to the benzene ring are disordered between two positions in a 0.908 (3):0.092 (3) ratio. In two of the independent molecules, the F and H atoms of the diflourophenyl ring are flip-flop disordered (i.e. by 180° about the C-C bond axis linking the ring to the rest of the molecule) in a 3:2 ratio. The crystal packing is stabilized by weak intermolecular C-HO hydrogen bonds.

Online 8 April 2009

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