| Abstract: | 2-(1′-Oxo-dodeca-5′, 8′, 11′, 14′, 17′(all Z)-pentaenyl)-5-methoxy-1, 3-dihydroxybenzene, 2- (1′-oxo-dodeca-5′, 8′, 11′, 14′, 17′(all Z)-pentaenyl)-1, 3, 5-trihydroxybenzene, 2-(17′-hydroxy-1′-oxo-dodeca-5′, 8′, 11′, 14′(all Z)-tetraenyl)-1, 3, 5-trihydroxybenzene and 2-(1′oxo-hexadecyl)-1, 3, 5-trihydroxybenzene have been isolated from the related brown algae Zonaria farlowii, Z diesingiana and Lobophora papenfussii. The structures of these new metabolites are based on extensive spectral analyses and comparisons with model compounds. The isolation of (+)-7, 8-dimethyltocol, from L. papenfussii, is also reported. |
