
TY  - JOUR
A1  - Gregson, RP 
A1  - Daly, JJ 
T1  - Polyhydroxy biphenyl ethers from the brown alga <I>Cystophora congesta</I>
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1982
VL  - 35
IS  - 3
SP  - 649
EP  - 657
KW  - 
UR  - https://doi.org/10.1071/CH9820649 
N2  - Two new phloroglucinol polymers have been isolated from the aqueous extract of the brown alga Cystophora congesta. They are the linear trimer 2,2',4,6,6'-pentahydroxy-1'-(3,5-dihydroxyphenoxy)- biphenyl ether (1)* and the isomeric angular trimer 3,4',5,6'- or 3,3',5,5'-tetrahydroxy-2'-(3,4,5-tri-hydroxyphenoxy)biphenyl ether which was characterized as its heptaacetoxy derivative (4). Structures were elucidated principally from an analysis of 13C n.m.r. chemical shifts and 13C-1H spin-spin coupling data. X-ray analysis was performed on the heptaacetoxy derivative of (1) to distinguish it from a regio-isomer (3). 
ER  -

