Derivatives of 1,3-thiazolidin-2,4-dione appended to biphenyl ring viz., 7-9, 16-18 were prepared. The newly synthesized compounds were confirmed by IR, NMR ( 1 H and 13 C) MS and elemental analyses. Single crystal X-ray diffraction study was carried out for one of the final compounds 9.

In the title compound, C15H15Cl2N2O+·Br−, the angle between the least‐squares planes of the di­chloro­phenyl moiety and the pyridine ring is 20.23 (9)°. The molecular packing is mainly influenced by intermolecular C—H⋯Br hydrogen‐bond interactions. The mol­ecules form an extended chain along the b axis, through C—H⋯Br hydrogen bonds.

Key indicatorsSingle-crystal X-ray study T = 298 K Mean (C-C) = 0.003 Å Disorder in main residue R factor = 0.059 wR factor = 0.183 Data-to-parameter ratio = 14.9For details of how these key indicators were automatically derived from the article, see

The title compound, C19H17NO3S, crystallizes in the monoclinic space group P21/c, with four mol­ecules in the unit cell. The structure contains a spiro‐carbon connecting a bi­cyclo‐octane group, consisting of two fused five‐membered rings, to an ace­naphthyl­ene moiety. The five‐membered ring containing the S atom is in an envelope conformation. The conformation of the other five‐membered ring of the bi­cyclo‐octane moiety is close to a half‐chair. The methoxycarbonyl group is equatorially substituted.

Key indicatorsSingle-crystal X-ray study T = 273 K Mean (C-C) = 0.002 Å Disorder in main residue R factor = 0.049 wR factor = 0.141 Data-to-parameter ratio = 13.1 For details of how these key indicators were automatically derived from the article, see