J. Iulek et al., STRUCTURES OF THE DIELS-ALDER REACTION-PRODUCTS OF THYMOQUINONE AND 1-VINYLCYCLOHEXENE .2. TRICYCLO[8.4.0.02,7]TETRADECA-4,9-DIENE-3,6-DIONE, C18H24O2, Acta crystallographica. Section C, Crystal structure communications, 50, 1994, pp. 85-86
The title molecule has an all-cis ring-fusion tricyclic structure, wit
h the angular isopropyl group opposite to the two cyclohexene ring sub
stituents. The cyclohexenedione and the cyclohexene rings are both in
a slightly distorted sofa conformation, whereas the cyclohexane ring a
dopts an almost ideal chair conformation. The molecule has an overall
distorted hemispherical conformation.