Abstract
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 identified; 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 first time as a natural product. Only one of the four silphiperfolan-6-ol stereoisomers I-IV detected has been described previously. All constituents identified seem to be generated by the same biogenetic pathway.
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