Furanoeremophilanes from Senecio smithii

The investigation of Senecio smithii afforded 17 furanoeremophilanes, six of them being isolated for the first time. Furthermore, two new bisabolon     

Further cadinene derivatives from Heterotheca latifolia

A reinvestigation of the aerial parts of Heterotheca latifolia afforded four new cadinene derivatives.     

Cacalol derivatives from Senecio lydenburgensis

An investigation of Senecio lydenburgensis afforded eight new cacalol and cacalohastin derivatives. Their structures were deduced from the molecular formulae and ¹H NMR spectra.     

Further silphinene derivatives from Cineraria geifolia var. glabra

A reinvestigation of the sesquiterpenes from the aerial parts of Cineraria geifolia var. glabra afforded eight new silphinene derivatives. One of these compounds had been isolated previously but its structure had not been elucidated with certainty. The stereochemistry of a corresponding isovalerate from Callilepis salicifolia has to be revised.     

Trixikingolides and germacrene derivatives from Trixis species

The investigation of two further Trixis species afforded five new sesquiterpenes related to trixikingolide, six new germacrene derivatives and a sesquiterpene derived from rotundene. Some further known compounds were isolated too, which in part may be of chemotaxonomic significance. The structures were elucidated by spectroscopic methods and a few chemical transformations. The relative position of the ester groups in eight of the new sesquiterpenoids however, could not be established with certainty as partial saponifications were not successful.     

A daucanolide further farnesene derivatives from Ageratum fastigiatum

A reinvestigation of Ageratum fastigiatum afforded, in addition to known compounds, several new farnesene derivatives including some tetrahydropyrane derivatives. Furthermore a sesquiterpene lactone derived from daucane and a minor derivative of the ent-labdanes isolated previously were isolated. The structures were elucidated by spectroscopic methods.     

Labdane and dehydronerolidol derivatives from Brickellia diffusa

An investigation of Brickellia diffusa afforded three new dehydronerolidol derivatives and five new labdane derivatives, all highly oxygenated. The structures were elucidated by spectroscopic methods and a few chemical transformations. The compounds isolated showed close relationships to those isolated from Brickellia sp.     

New cadinene derivatives from Heterotheca latifolia

Heterotheca latifolia afforded several new acids all derived from cadinane.     

Eremophilene and germacrene derivatives from Senecio glanduloso-pilosus

Senecio glanduloso-pilosus afforded in addition to known compounds a new eremophilene deriva- tive and a hydroperoxide derived from germacrene D.     

A tetracyclic sesquiterpene,further isocedrene and guaiene derivatives from Jungia stuebelii

The aerial parts of Jungia stuebelii afforded, in addition to known compounds, two guaiene derivatives, a pseudoguaiane derivative, nine isocedrene     

Caryophyllane derivatives from Pulicaria scabra

The investigation of Pulicaria scabra afforded in addition to known compounds seven new caryophyllane derivatives, three of them etherified with a caryophyllane derivative and one esterified with a caryophyllane derived alcohol. The structures were elucidated by high field ¹H NMR spectroscopy. The chemistry of this species is similar to that of P. dysenterica but differs from that of the other genera of the subtribe Inulinae.     

Eudesmanolides and costic acid derivatives from Flourensia macrophylla

The aerial parts of Flourensia macrophylla afforded, in addition to compounds similar to those from other Flourensia species, four new eudesman     

Eudesmane derivatives from Epaltes brasiliensis

The first investigation of an Epaltes species afforded two thiophene acetylenes and several eudesmane derivatives, all closely related to cuauhtemone, its esters being typical for Pluchea species. The structures were elucidated by spectroscopic methods.     

Sesquisabinene derivatives from Haplocarpha species

The roots of two Haplocarpha species afforded, in addition to sesquisabinene itself, three of its derivatives.     

Cuauthemone derivatives from Tessaria integrifolia and Pluchea symphytifolia

The aerial parts of Tessaria integrifolia afforded in addition to known compounds nine further cuauthemone derivatives and those from Pluchea symphytifolia also a further sesquiterpene of this type. The structures of two pairs of similar compounds are revised from 11-hydroxy to 11-peroxy derivatives.     

Four heliangolides and other sesquiterpenes from Brasilia sickii

The investigation of Brasilia sickii afforded, in addition to known compounds, two new bisabolene derivatives, an acetate closely related to damsin     

Three cadinene derivatives and a prostaglandin-like acid from Chromolaena species

An investigation of the aerial parts of Chromolaena chasleae afforded a prostaglandin-like acid, whose structure followed from the ¹H NMR spectral data and from the reaction with periodate, which afforded a hemiacetal. From a new Chromolaena species, three novel cadinene derivatives were isolated, which were closely related to those isolated previously from this genus.     

A rearranged eudesmane and further verbesindiol derivatives from Verbesina eggersii

A reinvestigation of Verbesina eggersii gave in addition to compounds isolated previously two further verbesindiol derivatives, a rearranged eudesmane and a benzofuran related to tremetone.