Irradiation of friedelan-21-ones: structure determination of novel friedelane triterpenes from kokoona zeylanica

Abstract
Formation of the photoproducts (10) and (12) and chemical and spectroscopic evidence suggest that kokoononol obtained from Kokoona zeylanica is 27-hydroxyfriedelane-3,21-dione (1); kokoondiol and kokoonol have been identified as 21α,27-dihydroxyfriedelan-3-one (2) and 27-hydroxyfriedelan-3-one (3), respectively, by chemical conversions.

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