Horst Czerson

Neue labdan- und pimaren-derivate aus Palafoxia rosea☆

Abstract The investigation of Palafoxia rosea afforded in addition to known compounds five new labdane derivatives and five pimarene derivatives. The structures are elucidated by spectroscopic methods and some chemical transformations. The chemotaxonomic situation of the genus is discussed briefly.

Sesquiterpenoid and acetylenic constituents of seven Clibadium species

Abstract The investigation of seven Clibadium species resulted in the isolation of a new germacrolide from C. surinamense , trans -β-bergamotene, a new sesquiterpene from C. asperum and a new C-17 acetylenic alcohol from C. glomeratum . Five known acetylenic compounds were present in some members of the genus. In good agreement with morphological data, the presence of ichthyothereol and its acetate in several members of Clibadium suggest affiliation with the genus Ichthyothere within the subtribe Milleriinae (Heliantheae-Compositae).