抄録
The benzene-MeOH (3:1) extract of a fossil plant found from Nakatsugo-South deposit (Ningyo-Toge Uranium deposit) were separated roughly by column chromatography and preparative TLC. Each fraction was examined by GC-MS. The main components have been classified into the following groups; a) methyl esters of the fatty acids (1, C_nH_<2n+1>CO_2CH_3, n=12-21), b) hydroxyl and/or methoxyl substituted derivatives of phenolic acids(4-9), c) phenolic aldehydes (2 and 3), d) an acetophenone derivative (10), e) a series of substances which show a characteristic fragment ion at m/e 99, and f) triterpene and nortriterpene ketones. The substances of the group e have not been identified yet. The nortriterpene ketones were further separated by GC and the structures 11 and 12 have been proposed for them from their 270MHz FT-PMR, FT-IR, and mass spectra. The syntheses of 11 and 12 from lanosterol are in progress.
