Baccharis species sesquiterpenes from

To date more than 100 species from the large genus Baccharis have been investigated chemically. The most widespread compounds are clerodane diterpene derivatives, but labdane derivatives have also been isolated. Furthermore, typical acetylenic compounds, baccharis oxide, a unique triterpene, and derivatives of hydroxyacetophenone are present, although it is mainly other biologically active constituents, e.g. flavonoids, sesquiterpenes and essential oils that have been reported in the last years. The constituents of Baccharis species compiled from different sources are presented below. 

More recently, Frizzo et al. [69] examined the essential oil from Baccharis uncinella D. C., popularly called Vassoura lageana , which grows wild in the South of Brazil. No previous phytochemical studies have been reported concerning the composition of volatile compounds from this Baccharis species. The monoterpene profile is similar to those reported for other Baccharis, such as B. dracunculifolia and B. crispa, while the sesquiterpene... 

Centered in South America, the approximately four hundred perennial herbaceous or shrubby Baccharis species extend in their range into North America 292). Their closest relatives most likely include Archibaccharis and Conyza (A. Cronquist, pers. commun.). The dominant lipophilic constituents of the leaf extracts from 54 taxa are diterpenes, triterpenes, sesquiterpenes, flavonoids, and other phenolics (Table 8 [pp. 443-446] Figure 22 [pp. 467-468]). Although ew/-clerodanes are the most frequently reported diterpene components, labdanes and tetracyclic /-kaurenes and ew/-stachanes are common (Figure 22). 

Additionally, the aerial parts of Baccharis petiolata D. C. from a collection in Chile afforded an unusual dimeric sesquiterpene [27], while B. boliviensis, a species widely distributed from Peru across Bolivia to Chile and Argentina, also yielded new sesquiterpenes [33],... 

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