SESQUITERPENE ETHERS FROM AUSTRALIAN MINTBUSH
Steam distillation of the leaf and terminal branchlets of Prostanthera sp. aff. ovalifolia growing in northeastern New South Wales gave 1–3% volatile oil containing 1,8-cineole, p-cymene, kessane and a novel C15H26O sesquiterpene. The latter gave (+)--selinene on treatment with trimethyliodosilane. COSY, FLOCK and nOe difference NMR experiments indicated cis-dihydroagarofuran. Infraspecific oscillation between kessane and cis-dihydroagarofuran as major component in Prostanthera was noted and hedycaryol proposed as a plausible common precursor. Ethanolic extract screening of populations established that sesquiterpene ether content was related to geographic location.
Southwell, Ian A. and Tucker, David J. (1993). SESQUITERPENE ETHERS FROM AUSTRALIAN MINTBUSH. Acta Hortic. 344, 428-433
Prostanthera sp. aff. ovalifolia, purple mintbush, Lamiaceae, essential oil, kessane, cis-dihydroagarofuran, hedycaryol, biogenesis, chemotaxonomy