By (Miss) Wai-Haan Hui," Man Moon Li, and (in part) (Miss) Yuk-Chun Lee, Department of Chemistry, Lithocarpic lactone. a new triterpenoid isolated from the leaves of both Lithocarpus lifchioides Chun and L. irwinii (Hance) Rehd. has been shown to be 2,3-secofriedelano-3,2-lactone (I).
Three further C32 triterpenoids isolated from the stems of Neolitsea pulchella, have been shown to be 3P.24E-dimethoxy-24,25-dimethyl-lanost-9(11 )-ene (I), 24E,-methoxy-24,25-dirnethyl-lanost-9( 1 1 )-en-3-one (11). and 24,24-dimethyI-lanosta-9(11),25-dien-3(3-ol (111). Compounds (I) and (11) are new. Kong THE structures of three new C, , triterpenoids isolated by column chromatography of the light petroleum extract methoxy-24,24-dirnethyl-lanosta-9( 11),25-diene (IV), SOC. (c), 1971, 2826.24,24-dimethyl-lanosta-9( 11) ,254ien-3-one (V), and 3pmethoxy-24,25-dimethyl-lanost-9( 1 l)-en-24<-01 (VI) .l A Of the stems Of Neoldsea $uzchelza were found to be 38-1 W.
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