Neue geranyl-cumarin-derivate und weitere inhaltsstoffe aus der tribus mutisieae

The investigation of further species of the tribe Mutisieae afforded in addition to already known compounds a new sesquiterpene derived from bisabolene, a new chromene, two benzofurans and two geranyl derivatives of typical coumarins. The chemotaxonomic importance of these compounds is discussed briefly.     

Ein neues diterpen und weitere inhaltsstoffe aus Baccharis-arten

The investigation of nine further Baccharis species afforded in addition to known compounds three new p-coumaric acid derivatives, a new eudesmane aldehyde and a clerodane dilactone. The structures are elucidated by spectroscopic methods. The chemotaxonomic situation in this genus is still not very clear. The compounds isolated are not very characteristic, as very similar ones are present in other genera of the tribe to which Baccharis belongs.     

Ein neues germacren-derivat sowie ein diterpenmalonat aus Baccharis-arten

The investigation of the aerial part of B. scandens afforded a new ketone, a germacrene derivative. The aerial parts of B. tricuneata var. lineata yielded, in addition to known ent-clerodane derivatives, a malonate of a further diterpene of this type. The structures are elucidated by spectroscopic methods.     

Neue labdan-derivate und andere inhaltsstoffe aus Relhania acerosa

The investigation of Relhania acerosa afforded, in addition to known compounds, three new labdane derivatives, two of which are esterified with succinic acid and one which has an anomalous carbon skeleton. Furthermore, several new aromatic compounds are isolated, which are most probably degradated thymol derivatives. The structures are elucidated by spectroscopic methods and by some chemical transformations. The stereochemistry of one of the new labdanes has been established by a partial synthesis. The chemotaxonomic situation is briefly discussed.     

Neue diterpene und neue dihydrochalkon-derivate sowie weitere inhaltsstoffe aus Helichrysum-arten

The investigation of 25 further Helichrysum species afforded in addition to known compounds a new diterpene, an oxo-geranyllinalol, a second one, most probably a cembrene derivative, and three dihydrochalkone derivatives. The distribution of the constituents in South African Helichrysum species is discussed briefly.     

Neue sesquiterpenlactone und andere inhaltsstoffe aus vertretern der Eupatorium-gruppe

The investigation of twelve further species of the Eupatorium complex affords four new germacrolides and seven guaianolides together with new thymol and p-hydroxyacetophenone derivatives. The structures of these compounds have been elucidated by spectroscopic methods. Chemotaxonomic aspects of these findings are briefly discussed.