
TY  - JOUR
A1  - Sutherland, MD 
A1  - Wells, JW 
T1  - Pigments of marine animals. IV. The anthraquinoid pigments of the crinoids, <I>Comatula pectinata</I> L. and <I>C. cratera</I> A. H. Clark
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1967
VL  - 20
IS  - 3
SP  - 515
EP  - 533
KW  - 
UR  - https://doi.org/10.1071/CH9670515 
N2  - A review of the literature describing the pigments of the crinoids (phylum Echinodermata) reveals a prevalence of indicator-type pigments which are of unknown nature, except for certain polyhydroxy-meso- naphthodianthrones isolated from a fossilized Jurassic stalked crinoid.   The highly coloured free-swimming crinoids, Comatula pectinata L. and C. cratera A. H. Clark, contain mixtures of indicator-type pigments which have been separated by adsorption chromatography on magnesium carbonate to yield three principal constituents, the 6-methyl and the 6,8-dimethyl ethers of rhodocomatulin, and a monomethyl ether of rubrocomatulin. The structure of the rhodocomatulin skeleton is shown to be 4-butyryl-1,3,6,8-tetrahydroxyanthraquinone rather than 2- butyryl-1,3,6,8-tetrahydroxyanthraquinone as previously suggested.1 
ER  -

