More than 100 constituents of the commercial topped Brazilian Vassoura oil (ex Baccharis dracunculifolia DC.) were identified by GC-MS and 1H-NMR spectra. The oil is composed of c. 19% of monoterpene hydrocarbons, c. 2% of oxygenated monoterpenes, c. 38% of sesquiterpene hydrocarbons, and c. 35% of oxygenated sesquiterpenes (15% nerolidol). The trace constituents (E)- and (Z)-4,8-dimethylnona-3,7-dien-2-one, the vitispiranes, the theaspiranes, β-damascone, β-damascenone, the cabreuva oxides, β-ionone, and some 3-phenyl propanoates are olfactorily valuable.
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Weyerstahl et al. (1996) studied this question.
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