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Radula variabilis

Variabilin (775), a unique dihydrochalcone with a dihydrooxepin skeleton has been isolated as its methyl ether from Radula variabilis. The structure assignment was based on spectroscopic correlation with the methylated bibenzyls prepared from the co-metabolites, (614) and (616) (61), A 3, 5 -Di-C-glycosylated dihydrochalcone (776) has also been detected in Hymenophyton species (203),... [Pg.163]

Radula variabilis ( = R. javanica) Campesterol Stigmasteroi Sitosterol... [Pg.247]

Seven New Bibenzyls and a Dihydrochalcone from Radula variabilis. Phytochem. 17, 2005 (1978). [Pg.272]

Radula species contain many bibenzyls incorporating prenyl groups. Seven such bibenzyls (612—614,616—618,620) have been isolated from R. variabilis structures were established mainly by detailed analysis of H-NMR and mass spectra (58, 61). In (612) the presence and the location of two phenolic hydroxyls and the geranyl group were settled by comparison of the signal pattern of the aliphatic protons with those of geraniol (3) and by observation of a NOE between two aromatic protons (H-2 and H-6) and the benzylic protons (5 2.93 ppm) of the dimethyl ether. Fragment ions at mjz 91 (100%) and mjz 111 (98%) and formation of a chromane derivative (653) from (612) further supported the proposed structure (612) (Scheme 74). [Pg.145]

See other pages where Radula variabilis is mentioned: [Pg.174]    [Pg.152]    [Pg.152]    [Pg.153]    [Pg.153]    [Pg.173]    [Pg.229]    [Pg.256]    [Pg.264]    [Pg.271]    [Pg.174]    [Pg.152]    [Pg.152]    [Pg.153]    [Pg.153]    [Pg.173]    [Pg.229]    [Pg.256]    [Pg.264]    [Pg.271]   
See also in sourсe #XX -- [ Pg.14 ]

See also in sourсe #XX -- [ Pg.96 , Pg.100 , Pg.104 , Pg.109 , Pg.145 , Pg.152 , Pg.153 , Pg.163 , Pg.173 , Pg.229 , Pg.247 , Pg.256 , Pg.264 ]



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