Experimental Crystal data

R factor = 0.032; wR factor = 0.085; data-to-parameter ratio = 28.5. The title compound, C17H24Cl4, 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 two three-membered rings from the reaction of -himachalene with dichlorocarbene. The six-membered ring shows a chair conformation, whereas the seven-membered ring displays a boat conformation. Related literature For the isolation of -himachalene, see: Joseph & Dev (1968); Plattier & Teisseire (1974). For the reactivity of this sesqui