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Acta Cryst. (2013). E69, o830
[ doi:10.1107/S1600536813011781 ]

(1S,3R,8R)-2,2-Dichloro-3,7,7,10-tetramethyltricyclo[6.4.0.01,3]dodec-9-en-11-one

N. Ourhriss, A. Benharref, A. Oukhrib, J.-C. Daran and M. Berraho

Abstract: The title compound, C16H22Cl2O, 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 is built up from fused six- and seven-membered rings and an additional three-membered ring arising from the reaction of himachalene with dichlorocarbene. 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 59.65 (14)°.


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