(1S,3R,8R,10R)-2,2-Dibromo-3,7,7,10-tetramethyltricyclo[6.4.0.0 1,3]dodecan-9-one

Abstract

The title compound, C16H24Br2O was synthesized by three steps from β-himachalene (3,5,5,9-tetramethyl-2,4a,5, 6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from essential oil of the Atlas cedar (Cedrus atlantica). The molecule is built up from a seven-membered ring to which a six-and a three-membered ring are fused. The six-membered ring shows a chair conformation. One C atom in the seven-membered ring and two methyl groups attached to the ring are disordered over two sets of sites, with an occupancy ratio of 0.658 (7):0.342 (7).