14-Hydroxycaryophyllene 4,5-oxide — A new sesquiterpene fromBetula pubescens
A new sesquiterpene — 14-hydroxycaryophyllene 4,5-oxide — has been isolated from the unsaponifiable part of an ethereal extract of the leaves ofBetula pubescens, and its structure has been established on the basis of chemical and spectral characteristics.
Essential oils from the buds of Betula spp. growing in Turkey
The essential oils from buds of Betula browicziana A. Guner, B. litwinowii Doluch., B. medwediewii Regel, B. pendula Roth and B. recurvata V. Vassil. (Betulaceae) were either hydrodistilled using a Clevenger-type apparatus or were subjected to Likens-Nickerson simultaneous distillation-extraction (SDE) when the plant material amounts were insufficient. The resulting bud essential oils were analysed by GC-MS. Main components were detected as 14-hydroxy-β-caryophyllene (1) and 14-hydroxy-4,5-dihydro-β-caryophyllene (2) in all the oil samples.
Schistosomicidal sesquiterpene lactone from Eremanthus elaeagnus
Abstract Eremanthine, a new guaianolide isolated from the heartwood oil of Eremanthus elaeagnus Sch. Bip., has the structure (I). It is the principal active constituent responsible for the prophylactic action of the oil against the human parasite Schistosoma mansoni .