Aromatic plants of tropical Central Africa. Part XXXI. Tricyclic sesquiterpenes from the root essential oil of Echinops giganteus var. lelyi C. D. Adams
✍ Scribed by C. Menut; G. Lamaty; P. Weyerstahl; H. Marschall; I. Seelmann; P. H. Amvam Zollo
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 194 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0882-5734
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✦ Synopsis
The essential oil from the roots of Echinops giganteus var. lelyi C. D. Adams from Cameroon was investigated by GC, GC±MS and NMR spectroscopy. The oil contains exclusively sesquiterpenes, two-thirds of which are hydrocarbons. Eighteen components, representing 83% of the oil, could be identi®ed; 14 of them (80%) are tricyclic sesquiterpenes with presilphiperfolane, silphiperfolane, isocomane and modhephane skeletons. The main constituent is silphiperfol-6-ene (26.9%), accompanied by presilphiperfol-7(8)-ene (9.4%) which is found for the ®rst time as a natural product. Only one of the four silphiperfolan-6-ol stereoisomers I±IV detected has been described previously. All constituents identi®ed seem to be generated by the same biogenetic pathway. # 1997