Abstract
The ether extract of Ricinocarpus stylosus
has yielded polyalthic acid, three new naturally occurring flavonoid pigments
and four new kauranoid diterpenes. The latter have been shown to be 16α-(-)-kauran-l7,19-dioic
acid (I; R,R' = CO2H), 19-hydroxy-16α-(-)-kauran-17-oic acid
(I; R = CH2OH, R' = CO2H), kauran-16α,-17,19-triol (III;
R,R' = CH2OH) and (-)-kaur-16-en-19-oic acid (IV; R = CO2H).
The N.M.R. correlations of these diterpenoids are discussed.
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