1,2,3,4,4b,4c,6,7,8,9,9b,9c-Dodeca­chloro-4b,4c,9b,9c-tetra­hydro­cyclo­buta­[1,2-a;3,4-a′]­di­indene-5,10-dione

The title compound, C₁₈Cl₁₂O₂, was synthesized by a solvothermal reaction between sodium and carbon tetrachloride; the oxygen may come from air. The mol­ecule has crystallographic C₂ symmetry and contains a four-membered ring, two five-membered rings and two six-membered rings. The five-membered rings are attached to opposite sides of the cyclo­butane group and the six-membered rings are fused to the five-membered rings. In the solid state, the mol­ecule adopts a boat form.