A further dithienylacetylene from Eclipta erecta

The roots and the aerial parts of Eclipta erecta afforded, in addition to compounds reported previously, a new dithienyl derivative.     

A new acetylenic ester from Artemisia absinthium

trans-Dehydromatricaria ester, a new thiopene derivative, a C₁₄-trans-spiroketalenol ether and a C₁₃-trans-spiroketalenol ether were isolated from the roots of Artemisia absinthium collected in E. Austria. Plants grown from a Finnish source gave an identical acetylenic profile.     

Weitere acetylenverbindungen aus Centaurea ruthenica

Reinvestigation of the polar fractions of the aerial parts of Centaurea ruthenica afforded, in addition to known compounds, more than 20 new ones, mostly in very small quantities, which in many cases could only partly be separated even after acetylation. The structures, however, could be elucidated by spectroscopic methods. Besides additional C₁₃-acetylenes, several new C₁₄- and C₁₀-acetylenes are present. The compounds isolated are of special interest in view of the proposed biosynthetic scheme of acetylenic compounds of this type.     

Variation in acetylene content of different ecotypes of Artemisia capillaris

The phenylacetylenes, capillen and capillin, are the main components in both the roots and leaves of Artemisia capillaris growing at riverside sites, but are not present in leaves from plants growing near the sea, although found in the roots. The relationship between acetylene content and ecotype of the plant is discussed.     

An acetylenic epoxide and a ferulate from Coreopsis longula

The aerial parts of Coreopsis longula gave, in addition to known compounds, a new acetylenic epoxide, hepta-deca-1,9E,15E-trien-11,13-diyn-7,8-epoxide, while the roots afforded a new ferulate, coniferyl ferulate.     

Tetraludin A,B and C,three new melampolides from Tetragonotheca ludoviciana

The investigation of the roots of the four Tetragonotheca species, T. ludoviciana, T. repanda, T. texana and T. helianthoides, resulted in the isolation of the known heptadeca-2-(Z)-8,10-(E)-16-tetraene-4,6-diin-1-ol and its aldehyde derivative from all four species. Aerial parts of T. ludoviciana also contained the acetate of the latter compound as a minor constituent and provided three new melampolide-type sesquiterpene lactones, tetraludin A, B and C.     

Formation of natural thiophene derivatives from acetylenes by Tagetes patula

Six tritium-labelled thiophene derivatives were synthesized and their emulsions were applied to whole plants of Tagetes patula. From the root extra     

Piperidides and other amides from Achillea species

The investigation of the roots of four Achillea species afforded, in addition to known ones eight new amides most of them being piperidides. The structures were elucidated by spectrocopic methods. The chemotaxonomic importance of the amides is discussed briefly.     

Bisabolene derivatives and acetylenic compounds from peruvian Coreopsis species

The investigation of three Peruvian Coreopsis species afforded, in addition to compounds isolated previously from this genus, two new tetraynenes and five sesquiterpenes all related to perezone, including a tricyclic ketone with a cedrane skeleton closely related to pipitzol. The structure were elucidated by spectroscopic methods.     

New sesquiterpenes and acetylenes from Athanasia and Pentzia species

Chemical investigation of several Athanasia and Pentzia species afforded in addition to known compounds a new furansesquiterpene, a new guaianolide related to matricarin, two biogenetically interesting acetylenic acids and an eremophilenic acid. The structures were elucidated by spectroscopic methods. The delimitation of the South African genera Athanasia, Pentzia and Matricaria is discussed. From the observed constituents it is suggested that some species should be transferred from Athanasia to Pentzia or vice versa and that the South African Matricaria species are possibly better placed in Pentzia.     

Eudesmanolides from Pluchea dioscoridis

Reinvestigation of the aerial parts of Pluchea dioscoridis afforded, in addition to known compounds, five new eudesmanolides and a new thiophene derivative. The stereochemistry of one of the eudesmanolides isolated previously has been corrected. The structures were elucidated by spectroscopic methods.     

The first acetylenic monoterpene and other constituents from Senecio clevelandii

The aerial parts of Senecio clevelandii afforded three new monoterpene lactones, one of them being the first acetylenic monoterpene to be isolated, a C-14 acetylenic angelate, a tetrahydroquinol ester and several known compounds, among them the tricyclic precursor of the polycyclopentanoide sesquiterpenes.