Abstract
We report the presence, in an immature Brazilian oil shale (Irati), of C19C26 tricyclic triterpanes, present as mixtures of stereoisomers. The C20 components have been identified by comparison with synthetic standards as 13β(H),14β(H); 13α(H),14β(H); 13β(H),14α(H) and 13α(H),14α(H) isomers. By extrapolation, all fourC21 homologues and the C23–C26,14α(H) and 13α(H),14α(H) isomers are also shown to occur. The geochemical significance of these findings is discussed.
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