(2R,3R,5R)-2-[(2R,3aS,6aR)-2,3,3a,-4,5,6a-hexahydrofuro[2,3-b]furan-2-yl]-5-isopropenyl-2,3-dimethylcyclo-hexanone and (4aR,5S,7R)-5-isopropenyl-7,8,8-trimethyl-2,3,4,4a,-5,6,7,8-octahydronaphthalene-4a-carbonitrile

The molecular structures of two chiral cyclohexanones based on R-(-)-carvon e, C17H26O3, (I), and C17H23NO, (II), are reported here. The six-membered r ing in (I) is in a chair conformation with the two fused five-membered ring s of the furofuranyl substituent in a cis configuration. Compound (II) cont ains a decalin group; one ring has the chair form whilst the other is in a half-boat conformation. Both products have been characterized spectroscopic ally, however, neither NMR nor IR results could prove the stereochemistry a t each chiral centre unambiguously. The crystal analyses were used to exami ne conformational properties of the compounds.