Abstract
The absolute structure (1a) of catalponol, a naphthoquinone congener of Catalpa ovata (Bignoniaceae), was revised to 1 on the basis of chemical correlation with isocatalponol (2), a substance of the same group occurring in Lippia origanoides (Verbenaceae). The validity of the absolute structure of 1 thus deduced, and hence those of isocatalponol (2) and catalponone (6), was verified by single crystal X-ray analysis of the p-bromobenzoate of 2-epicatalponol (9) derived from 1.
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