Abstract
Linderene and its dihydro-derivatives were converted to the corresponding unsaturated enol lactones (III, IXa and XIIa) by the action of dichlorodicyanobenzoquinone. These unsaturated enol lactones (IXa and XIIa) gave the triene lactones (XVI and XVII). Configuration of the cyclopropane ring in linderene was assigned as β from the results of the NMR spectra of XVI and XVII. The structure of isodihydrolinderene was also confirmed by comparison of the NMR spectra of XIIa and its acetate (XIIb).
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