
%0 Journal Article
%A Kent, RA 
%A Smith, IR 
%A Sutherland, MD 
%T Pigments of marine animals. X. Substituted naphthopyrones from the crinoid <I>Comantheria perplexa</I>
%J Australian Journal of Chemistry
%D 1970/11/01
%V 23
%N 11
%P 2325-2335
%K 
%R https://doi.org/10.1071/CH9702325
%U https://www.publish.csiro.au/paper/CH9702325 
%X Acetone extraction of the flesh of the comatulid crinoid Comantheria perplexa (H. L. Clark) yields a mixture of substances from which the sodium salt of the sulphuric ester (12) of 8-hydroxy-5,6-dimethoxy-2-methyl-4H-naphtho[2,3-b]pyran-4-one (8) has been isolated. Acid hydrolysis of (12) yields the phenol (8) which on methylation is converted into rubrofusarin dimethyl ether and on partial demethylation yields a product identical with a dehydration product (10) of fonsecin.    Hydrolysis of the crude extract from C. perplexa yields (8), (10), and 8-hydroxy-5,6-dimethoxy-2-n-propyl-4H-naphtho[2,3-b]pyran-4-one (13). The structures of the isolated substances suggest a polyketide-type synthetic activity by this species.    The stalked crinoids Endoxocrinus parrae (Gervais) and Neocrinus decorus (Wyville Thomson) yield negligible quantities of aromatic polyketides. 
