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.     

Inhaltsstoffe aus Gynoxys- und Pseudogynoxys-arten

Five new furanoeremophilanes have been isolated from Gynoxys sancto antonii, while two Pseudogynoxys species yield three new polyenes. The chemotaxonomic aspects are discussed.     

Weitere isocedren-derivate aus Trixis paradoxa

The investigation of two further species from the tribe Mutisieae afforded in addition to known compounds three new sesquiterpene lactones and two further sesquiterpene esters, all closely related to compounds isolated before from other Trixis species. The isolation of these new substances from Trixis further establishes the chemotaxonomic situation in the subtribe Nassauviinae. From the Dinoseris species, among others, 1β-hydroxyalantolactone was isolated, indicating a relationship to the subtribe Gochnatiinae.     

Neue germacranolide aus Calea urticifolia

The investigation of Calea urticifolia afforded eight new germacranolides. While five are heliangolides, three are of a new type and have some unusual structural features. The structures are elucidated by extensive ¹H-NMR studies and some chemical transformations. In addition, a new isoeugenol and an unusual phloroglucinol derivative were isolated; the structure of the latter could only be established after some chemical transformations. Other Calea species contain typical C₁₇ acetylenes only, also present in other species of the subtribe Galinsoginae. So far, the results on Calea indicate that the genus is chemically heterogenous.     

Neue sesquiterpenlactone und thymol-derivate aus Inula-arten

The investigation of three Inula species affords, besides known compounds, two new sesquiterpene lactones and two new thymol derivatives. The chemotaxonomic situation in this genus is still very complicated.     

Five diterpenes and other constituents from nine Baccharis species

The investigation of nine Baccharis species afforded, in addition to known compounds, three new clerodane derivatives related to bacchotricuneatin B, two ent-labdane derivatives, two 3-acetoxyflavanones, a benzofuran derivative and a chromene. The overall picture of the chemistry of this large genus is still not very clear.     

Neue acetylenverbindungen aus Leucanthemum-arten und revision der struktur eines germacranolids

The investigation of three Leucanthemum species afforded, in addition to known compounds, two new C₁₇-acetylenes, a new isovalerate, two phenolic acetylenes, a C₁₂-isobutylamide and a new farnesol derivative. Chrysanthemum ferulaceum contains deacetyllaurenobiolide (spiciformin) which is identical with a lactone from Inula britannica previously assumed to be a cis, cis-germacranolide.     

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.     

Neuartige sesquiterpenlactone und neue acetylenverbingen aus Athanasia-arten

The investigation of two further South African Athanasia-species afforded, in addition to known compounds, sixteen new ones, ten guaianolides, an eudesmanolide, three sesquiterpenes, a new enediynene and a phenylpropane derivative. The structures were elucidated by extensive NMR-studies. Three of the lactones are very unusual in having an endoperoxide bridge; their structures, however, were elucidated only indirectly. These further chemical results on Athanasia again add support to the idea that these species might be better placed in the genus Pentzia.     

Neue elemanolide und guajanolide aus Zinnia-arten

The investigation of three Zinnia species afforded thirteen new elemanolides. Though these compounds could be separated only in part, the spectroscopic data clearly indicate the proposed structures. Furthermore, four new guaianolides were isolated. The chemotaxonomic situation is discussed briefly.     

Neue ent-atisiren- und ent-kaurensäure-derivate aus Helianthus-arten

The investigation of four Helianthus species afforded, in addition to known compounds, four new atisirenic acid derivatives, a new ent-kaurenic acid derivative, three new labdane derivatives and an unknown C₁₅-acetylenic compound. The structures of the diterpenes were elucidated by intensive NMR studies and some chemical transformations. An unusual fragmentation in the mass spectra of the atisirenes is discussed briefly.     

Doryctopambolus Nunes & Zaldívar-Riverón (Braconidae), a new neotropical doryctine wasp genus?with propodeal spines

The new Neotropical doryctine genus Doryctopambolus gen. n. is erected to contain Doryctopambolus pilcomayensis (van Achterberg & Braet, 2004), comb. n., which was previously placed within Pambolus (Pambolinae), as well as three new species, Doryctopambolus clebschi sp. n., Doryctopambolus dominicanus sp. n. and Doryctopambolus sarochensis sp. n. Members of this new genus are mainly characterised by the presence of at least one pair of conspicuous propodeal apico-lateral projections, which are similar to those present in all members of Pambolinae and in species of three Australasian doryctine genera. We generated DNA barcoding sequences for the three newly described species. We discuss the morphological similarity between species of the Australasian Echinodoryctes Belokobylskij, Iqbal & Austin and Doryctopambolus. A key for the described species of Doryctopambolus is provided.     

Ein neues clerodan-derivat sowie weitere inhaltsstoffe aus der gattung Macowania ag

The roots of M. corymbosa afford three new benzofuran derivatives very closely related to leysseralangelicate isolated from the related genus Leyssera. The aerial parts of M. glandulosa contain, besides labdanolic acid, a new cis-clerodane derivative, its structure being elucidated by spectroscopic methods and by chemical reactions. The roots of a further Macowania species closely related to M. hamata afford a new ester related to m-thymol.     

Neue diterpene und acetylenverbindungen aus Nidorella-arten

The investigation of four species of the South African genus Nidorella afforded three new clerodane derivatives, nidorellalactone, isonidorella     

Neuartige ester von eremophilen-derivaten aus südafrikanischen Senecio-arten

The investigation of three further South African Senecio species afforded, in addition to known compounds, 11 new eremophilenes and two new eud     

Neue diterpene und germacranolide aus Mikania-Arten

From three Mikania species, three new labdanic acid and two kaurenic acid derivatives have been isolated together with known compounds and four new germacranolides, differing only in the ester moiety.     

Discovery of Lower Famennian Stromatoporoidea in the Kuznetsk Basin

Stromatoporoidea recorded for the first time from the Lower Famennian of the Kuznetsk Basin are described. The assemblage studied includes three new species, Actinostroma quasifenestratum sp. nov., Kyklopora tomiensis sp. nov., and Coenostroma rarum sp. nov., and three previously known species of different genera.     

A new type of germacranolide from Vernonia species

From several South African Vernonia species, a considerable number of sesquiterpene lactones has been isolated. Together with known compounds, seven members of a new type with an enol lactone ring have been found, their structures being elucidated by spectroscopic methods and some chemical transformations. Furthermore two new derivatives of costunolide are present in two species, and three new guaianolides have been found. From some species, however, no lactones could be isolated. Together with a new bisabolene derivative, a known eremophilone has been isolated, probably for the first time, from a member of the tribe Vernonieae.     

Neue,chlorsubstituierte thiophenacetylenverbindungen mit ungewöhnlicher struktur aus Helichrysum-arten

The investigation of two further Helichryswn species afforded in addition to known constituents three new thiophene compounds with unusual structures. A biogenetic scheme of aromatic ring formation for this new type of chlorine containing compounds is proposed. Most probably, the pyran ring of the chloroenol ether is transformed to an aromatic ring by dehydrogenation, hydrolysis and intramolecular aldol condensation.     

Diterpenes and tetranorditerpenes from Acritopappus species

The investigation of four Acritopappus species afforded twenty-three new diterpenes of the labdane or kolavane type and three tetranorditerpenes as well as two new benzofuran derivatives and a hydroxybicyclogermacrene. The structures were elucidated by spectroscopic methods and by some chemical transformations. Though the absolute configuration were not established in all cases, most probably all diterpenes were ent-labdanes or kolavanes (clerodanes). The chemotaxonomic importance of this investigation is discussed briefly.