| Structure Identification: |
| Tetrahedron.1971;27(22):5419-5431. | | Sesquiterpenes from Acorus calamus L.[Reference: WebLink] |
METHODS AND RESULTS:
Five new sesquiterpenes were isolated from Acorus calamus L., in addition to calameone (or calamendiol), the structure of which was revised, and their structures were established. Furthermore, chemical co-relation among these sesquiterpenes was carried out. In particular, the thermal isomerization of shyobunone (I), an elemene-type sesquiterpene, to Preisocalamendiol (VI), a germacrone-type compound, should be noted. | | Pharmaceutica Acta Helvetiae. 1995 April;70(1):79–84. | | Essential oils of Daucus carota ssp. maximus.[Reference: WebLink] | The fruit, leaf and stem essential oils of Daucus carota ssp. maximus have been studied by GC-MS.
METHODS AND RESULTS:
The fruit oil consists chiefly of phenylpropanoids and sesquiterpene hydrocarbons. It is characterized by the presence of trans-methylisoeugenol, methyleugenol, β-asarone, shyobunone and Preisocalamendiol. Phenylpropanoids are completely absent from both the leaf and stem oils and the oxygenated sesquiterpenes constitute about 52 and 80%, respectively of the oils composition, with shyobunones and Preisocalamendiol as major component. These monocyclic ketones as well as α-bourbonene, aristol-9-en-3-ol and aristolenol have never before been reported as components of any Daucus oil.
CONCLUSIONS:
Unlike most of the studied varieties, carotol, daucol and geranyl acetate are completely absent. These results reflect the unique composition of the essential oils of this Lebanese variety. | | Tetrahedron Letters,1970,11(11):855-7. | | Preisocalamendiol, a plausible precursor of isocalamendiol[Reference: WebLink] |
METHODS AND RESULTS:
Preisocalamendiol, a plausible precursor of isocalamendiol |
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