- The sesquiterpene constituents of the liverwort Preissia quadrata
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The labile sesquiterpene hydrocarbon germacrene C is the main constituent of a chemotype of the liverworth Preissia quadrata collected in Southern Germany. Its temperature dependent rearrangement to racemic δ- elemene is observed by capillary gas chromatography using cyclodextrins as chiral stationary phases. In addition, the rarely found ent-sesquiterpenes (+)-germacrene D, (+)-trans-β-caryophyllene, (+)-β-caryophylleneoxide, (+)- cubebol and racemic alismol [1β,5α-guaia-6,10(15)-dien-4-ol] were identified an major constituents using spectroscopic methods and enantioselective gas chromatography. Minor constituents are (+)-α-copaene, (+)-δ-selinene, (-)-δ-cadinene, germacrene B and (-)-cascarilladiene (eudesma-5,7-diene).
- Koenig, Wilfried A.,Buelow, Nils,Fricke, Christiane,Melching, Stephanie,Rieck, Angela,Muhle, Hermann
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- Reaction of elemol with acetic acid/perchloric acid: Characterization of a novel oxide and (+)-β-cyperone
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The minor unidentified compounds of the acetic acid/perchloric acid dehydration of elemol (1) were fully characterized. The structure and relative configuration of the less polar fragrant compound 2, named elemoxide, was deduced by ID- and 2D-NMR data inc
- Wahidulla, Solimabi,Govenkar, Mangala Babu,Paknikar, Sashikumar Keshav
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p. 496 - 501
(2007/10/03)
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