2,5-Dichloro­thio­phene 1,1-dioxide

The complete mol­ecule of the title compound, C4H2Cl2O2S, is generated by crystallographic twofold symmetry, with the S atom lying on the rotation axis. In the crystal, the molecules are linked by C—H⋯O hydrogen bonds.

1,2-Dimethyl-4,5-diphenyl­benzene determined on a Bruker SMART X2S benchtop crystallographic system

The title compound, C20H18, has two crystallographically independent mol­ecules in the asymmetric unit. The phenyl substituents of mol­ecule A are twisted away from the plane defined by the central benzene ring by 131.8 (2) and −52.7 (3)°. The phenyl substituents of mol­ecule B are twisted by −133.3 (2) and 50.9 (3)°. Each mol­ecule is stabilized by a pair of intra­molecular C(aryl, sp 2)—H⋯π inter­actions, as well as by several inter­molecular C(methyl, sp 3)—H⋯π inter­actions