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In the title compound, C 16 H 15 NO 2 S [alternative name: rac -2,3-diphenyl-1,3-thia-zinan-4-one 1-oxide], the thia-zine ring exhibits an envelope conformation, with the S atom forming the flap. The sulfoxide O atom is in a pseudo-axial position on the thia-zine ring and is trans to the phenyl group on C-2. The phenyl rings form a dihedral angle of 89.47 (19)°. In this racemate crystal, homochiral mol-ecules form slabs parallel to (010) of thickness b /2 which then stack with alternating chirality in the b -axis direction. The stacking is aided by edge-to-face inter-actions between the phenyl rings of racemic mol-ecules. Within each of the single-enanti-omer slabs, the mol-ecules are held by C-H⋯O-type inter-actions, with an H⋯O distance of 2.30 Å, forming infinite chains along the c -axis direction, as well by the edge-to-face inter-actions between phenyl rings of neighboring mol-ecules in the a -axis direction.

Crystal structure ofrac-2,3-diphenyl-2,3,5,6-tetrahydro-4H-1,3-thiazin-4-one 1-oxide