
%0 Journal Article
%A Cooke, RG 
%A Merrett, BK 
%A O'Loughlin, GJ 
%A Pietersz, GA 
%T Colouring matters of Australian plants. XXIII. A new synthesis of arylphenalenones and naphthoxanthenones
%J Australian Journal of Chemistry
%D 1980/10/01
%V 33
%N 10
%P 2317-2324
%K 
%R https://doi.org/10.1071/CH9802317
%U https://www.publish.csiro.au/paper/CH9802317 
%X Condensation of naphthalene-2,7-diol with 2,4-dioxo-4-phenylbutanoic acid gives 6-hydroxy-1-oxo-9-phenyl-1H-phenalene-7-carboxylic acid which is readily converted into the lactone and on treatment with diazomethane forms only methyl 6-methoxy-1-oxo-9-phenyl-1H-phenalene-7- carboxylate. Analogous reactions of other 4-aryl-2,4-dioxobutanoic acids with naphthalene-2,7-diol or with 3,6-dimethoxynaphthalene-2,7- diol give easy access to arylphenalenones and naphthoxanthenones related to natural pigments. 
