The essential oil of the leaves of Eugenia uniflora L. (Myrtaceae) was investigated by GLC, NMR, and mass spectrometry. Main constituents are furanodiene (27a), and the hitherto unknown selina-1,3,7(1 1)-trien-8-one (36) and oxidoselina-1 ,3,7(1 1)-trien-8-one (41). The oil contains almost no monoterpenes, but several known sesquiterpenes. The characteristic odor of the oil is determined by the mushroom-like, woody, and spicy smelling furanodiene (27a), and by the green and cucumber note of selinatrienone (36).

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The polar part of commercial Haitian vetiver oil was converted to the methyl ethers, and this product separated by distillation and repeated flash chromatography (FC). The following new (nor‐) sesquiterpene alcohols were isolated as their methyl ethers and identified by their 1H‐ and 13C‐NMR spectra: 12‐nor‐ziza‐6(13)‐en‐2β‐ (2) and ‐2α‐ol (3), eudesma‐4(15),7‐dien‐3β‐ (7) and ‐2β‐ol (18), eudesma‐3,5‐dien‐1α‐ol (26), eremophila‐1(10),4(15)‐dien‐2α‐ol (31), eremophila‐1(10),11‐dien‐2α‐ol (nootkatol, 38), guaia‐1(5),11‐dien‐3‐ol (11), spirovetiva‐3,7(11)‐dien‐12‐ol (42), preziza‐7(15)‐en‐3α‐ol (14) and helifol‐1‐en‐14‐ol (syn. khusien‐14‐ol, 12). Furthermore, the hemi‐acetal 7,10‐epoxy‐salvialan‐10‐ol (8) was identified. The structure of some artefacts formed by alkylation of β‐vetivone 52 (→M 39, M 43) and of 11,12,13‐tri‐nor‐eudesmenone (→16, 17) was also elucidated. Copyright © 2000 John Wiley & Sons, Ltd.

Commercial Labdanum oil contains more than 300 constituents. 186 compounds (154 from the neutral part, 32 from the acidic part), representing about 95% of the oil, were identi®ed mainly by their NMR spectra. Typical for the Labdanum oil in the C 15 to C 20 region are aromadendrane (23%), cadinane (9%) and labdane (7%) derivatives, mostly oxidized. The main constituents in this region are ledene (92, 9.3%), allo-