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Acta Cryst. (2013). E69, o724
[ doi:10.1107/S1600536813009070 ]

(1S,3R,8R,9S,11R)-2,2-Dibromo-10,10-dichloro-3,7,7,11-tetramethyltetracyclo[6.5.0.01,3.09,11]tridecane

N. Ourhriss, A. Benharref, M. Saadi, M. Berraho and L. El Ammari

Abstract: The title compound, C17H24Br2Cl2, was synthesized from [beta]-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The molecule contains fused six-, seven- and two three-membered rings. The six-membered ring has a half-chair conformation, while the seven-membered ring displays a boat conformation. The absolute structure was unambiguously established from anomalous dispersion effects. The crystal packing exhibits no short intermolecular contacts.


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