Abstract
Investigation of the foliage oils of 49 specimens of P. spicatus has shown marked infraspecific variation. Seven sesquiterpene hydrocarbons (δ-elemene, α-copaene, longifolene, germacrene-D, bicyclogermacrene, δ-cadinene and selina-4(14),7(11)-diene), two oxygenated sesquiterpenes (curzerenone and atractylon), ten diterpene hydrocarbons (rimuene, beyerene, sclarene, rosadiene, pimaradiene, sandaracopimaradiene, isopimara-7,15-diene, isopimara-8,15-diene, phyllocladene and kaurene), and two oxygenated diterpenes (8β-hydroxyisopimarene and ferruginol) have been isolated and identified. Of particular interest is the isolation of (+)-germacrene-D and (−)-δ-cadinene, along with the rarely reported curzerenone, atractylon, and (+)-rosadiene. This is the first report of selina-4(14),7(11)-diene in an optically active form. The occurrence of both enantiomers of sandaracopimaradiene is also of interest. The biosynthetic significance of correlations in the levels of the terpenes present is discussed.
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