Acta Cryst. (2012). E68, o3341-o3342
[ doi:10.1107/S1600536812046089 ]

(1S,3R,8R)-2,2-Dibromo-3,7,7,10-tetramethyltricyclo[6.4.0.0^1,3]dodec-9-en-11-one

A. Oukhrib, A. Benharref, M. Saadi, L. El Ammari and M. Berraho

Abstract: The title compound, C₁₆H₂₂Br₂O, was synthesized from -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 is built up from fused six- and seven-membered rings and an additional three-membered ring from the reaction of himachalene with dibromocarbene. The six-membered ring has an envelope conformation, with the C atom belonging to the three-membered ring forming the flap, whereas the seven-membered ring displays a screw-boat conformation; the dihedral angle between the rings (all atoms) is 60.92 (16)°.

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