J. Iulek et al., STRUCTURES OF THE DIELS-ALDER REACTION-PRODUCTS OF THYMOQUINONE AND 1-VINYLCYCLOHEXENE .1. -TRICYCLO[8.4.0.02,7]TETRADECA-4,9-DIENE-3,6-DIONE, Acta crystallographica. Section C, Crystal structure communications, 49, 1993, pp. 1657-1659
The title molecule has an all-cis ring-fusion tricyclic structure. wit
h the angular isopropyl group next to the two cyclohexene ring substit
uents. The cyclohexenedione ring is in a sofa conformation, the middle
cyclohexene ring adopts a half-chair conformation and the cyclohexane
ring adopts an almost-ideal chair conformation. The molecule adopts a
n overall distorted-hemispherical conformation.