2-r-(4-Chloro-phen-yl)-6-c-phenyl-3,4,5,6-tetra-hydro-2H-thio-pyran-4-one 1-oxide

The thio-pyran unit of the title mol-ecule, C(17)H(15)ClO(2)S, is in chair form. A crystallographic mirror plane bis-ects the mol-ecule, passing through the O=S and the opposite C=O atoms of the central ring, with statistical disorder of the Cl atom. The geometry around the S atom is tetra-hedral and the carbonyl C is planar. The 4-chloro-phenyl group at the 2 position and the phenyl ring at the 6 position have equatorial orientations. Inter-molecular C-H⋯O and C-H⋯Cl hydrogen bonds are found in the crystal structure. In addition, there is a short O⋯C inter-molecular contact [2.970 (5) Å].