Structures of angrendiol, ferolin, and chimganidin
SummaryOn the basis of the results of a study of the products of chemical transformations and spectra, the structure of angrendiol has been established as 4,8-dihydroxygermacra-1(10), 5(6)-diene. It has been shown that ferolin and chimganidin are monoesters of angrendiol with parahydroxybenzoic and vanillic acids, respectively, at the secondary hydroxy group.
Stereospecific cope rearrangement of the germacrene-type sesquiterpenes
Abstract Stable, conformations of several germacrene-type sesquiterpenes in solution are deduced with the aid of intramolecular nuclear Overhauser effects (NOE) in the NMR spectra. From these conformations, stereochemical aspects of the Cope rearrangement as well as the stereochemistry of the elementype rearrangement products can readily be understood.
Terpenoids-XXIV : Isolation of 12-methoxydihydrocostunolide from costus root oil
The methoxylactone isolated from costus root oil is shown to be 12-methoxydihydrocostunolide.