(1R,2R,5R,6S,9R,10S,13S,14S,18R)-1,6,7,8,9,14,15,16,17,17,18-Undecachloropentacyclo[12.2.1.16,9.02,13.05,10]octadeca-7,15-diene

Abstract

The title compound, C18H13Cl11, is an undecachlorinated commercial flame retardant. The asymmetric unit contains two independent half-molecules. The complete molecules are generated by crystallographic inversion symmetry, causing the terminal H atoms and one of the Cl atoms to be disordered equally over two sites in each molecule. The central eight-membered rings are in chair-type conformations. In the crystal structure, there is a single weak intermolecular C—H...Cl hydrogen bond.