endo-6,syn-7-Di­chloro-exo-6-phenyl­sulfonylbi­cyclo­[3.1.1]­heptane

The reaction between 1-(phenyl­sulfonyl)­tri­cyclo­[4.1.0.0^2,7]­heptane, (1), and nitryl chloride in (CH₃)₂O gives rise to formation of a mixture of chlorination products instead of the expected nitro compounds. This mixture consists of the title compound, C₁₃H₁₄Cl₂O₂S, (2), and exo-6,syn-7-di­chloro-endo-6-phenyl­sulfonyl­bi­cyclo­[3.1.1]­heptane, (3), in the ratio 88:12. The structure of the major product, (2), was established by X-ray analysis. In (2), the phenyl­sulfonyl group has an axial orientation, and both Cl atoms are in equatorial positions.