Die Untersuchung von zwei Heliopsis-Arten ergibt drei neue, hochungeslttigte N-lsobutylamide von Cl8-Acetylencarbonsauren und ein weiteres Lignan, das nahe verwandt ist mit friiher isolierten Derivaten.
Polyacetylenic Compounds, 269 *). -New N-lsobutylamides From Heliopsis SpeciesThe investigation of two Heliopsis species afforded in addition to known compounds three new highly unsaturated N-isobutylamides of CIE-acetylenic carbonic acids and a further lignane closely related to derivatives which were isolated previously.
New Sesquiterpene Lactones and Rosane Derivatives from Trichogonia SpeciesThe investigation of five Trichoginiu species afforded in addition to known compounds 22 sesquiterpene lactones, five guaianolides (13 -15, 17, and 18), four heliangolides (19 and 21 -23), five bejaranolides (30 -34), two trichogoniolides (37 and 38), two epimeric trichosalviolides (42 and 43), two atripliciolides (27 and 28), a germacranolide (45), and a modified isotrichogoniolide (41). Furthermore eleven diterpenes, ten being rosane derivatives (46-54 and 57) and one a pimarene alcohol (60). as well as two aromatic compounds (6 and lo), related to p-hydroxyacetophenone, were isolated. The structures were elucidated by spectroscopic methods and a few chemical transformations. The biogenetic relationships are discussed.Die brasilianische Gattung Trichogonia'), friiher eine Sektion von Kuhnia", wird in die taxonomisch nicht sehr einheitliche Subtribus Gyptidinae (Tribus Eupatorieae, Fam. Compositae) eingeordnet '). Erste chemische Untersuchungen von vier Vertretern haben gezeigt, daR wahrscheinlich p-Hydroxyacetophenon-Derivate, bei denen die Acetylgruppe in eine Vinylgruppe umgewandelt worden ist, sowie hochoxidierte Sesquiterpenlactone fur diese Gattung charakteristisch sind4
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