Acta Cryst. (2013). E69, o218
[ doi:10.1107/S1600536812051343 ]

(7aR)-1-[(2R,5S,E)-6-Hydroxy-5,6-dimethylhept-3-en-2-yl]-7a-methylhexahydro-1H-inden-4(2H)-one

M. L. Rivadulla, M. Sene, M. González and B. Covelo

Abstract: The chiral title compound, C₁₉H₃₂O₂, contains a [4.3.0]-bicyclic moiety in which the shared C-C bond presents a trans configuration and a side chain in which the C=C double bond shows an E conformation. The conformations of five- and six-membered rings are envelope (with the bridgehead atom bearing the methyl substituent as the flap) and chair, respectively, with a dihedral angle of 4.08 (17)° between the idealized planes of the rings. In the crystal, the molecules are self-assembled via classical O-HO hydrogen bonds, forming chains along [112]; these chains are linked by weak non-classical C-HO hydrogen bonds, giving a two-dimensional supramolecular structure parallel to (010). The absolute configuration was established according to the configuration of the starting material.

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