HYDROXYPHLORETHOLS FROM THE BROWN ALGA CARPOPHYLLUM-MASCHALOCARPUM

The structural elucidation of 20 phloroglucinol derivatives isolated from the ethanolic extract of the brown alga Carpophyllum maschalocarpum after peracetylation is described. Seven of them, the acetyl derivatives of 1,2,3,5-tetrahydroxybenzene, tetrafuhalol-D, hydroxypentaphlorethol, deshydroxypentafuhalol-A, hydroxypentafuhalol, hydroxyhexaphlorethol and hexafuhalol-B are described for the first time. The structural elucidation was carried out on the basis of spectral data. Three substances consisting of phloroglucinol units linked exclusively by para-aryl ether bonds and substituted by one additional hydroxyl group are called hydroxyphlorethols, because they are a new group of phlorotannins.