The structure of roemrefine
ConclusionsStructure (1) has been established for roemrefine on the basis of a study of the products of its Hofmann degradation, oxidation, and spectral characteristics.
Structure of the sequiterpene lactones fromCyclachaena xanthifolia
ConclusionsThe racemes ofCyclachaena xanthifolia Fresen. have yielded four sesquiterpene lactones, two of which are new, not having been described in the literature previously, and these have been called ivoxanthin and 1,2-anhydrocoronopilin. Structures II and IV have been proposed for these.The plant also contains the sesquiterpene lactones coronopilin and ambrosin.
GARRYA ALKALOIDS: I. THE STRUCTURE OF GARRYINE AND VEATCHINE
By means of hydrogenation, oxidation, and isomerization experiments it has been established that the chemistry of veatchine and garryine parallels the chemistry of atisine and isoatisine.Dehydrogen...