
%0 Journal Article
%A Gillis, RG 
%A Porter, QN 
%T 5-Methoxyphenanthrene-4-carboxylic Acid
%J Australian Journal of Chemistry
%D 1989/06/01
%V 42
%N 6
%P 1007-1010
%K 
%R https://doi.org/10.1071/CH9891007
%U https://www.publish.csiro.au/paper/CH9891007 
%X Lead tetraacetate oxidation of phenanthrene-4,5-dicarboxylic acid in acetonitrile with pyridine affords 5-hydroxyphenanthrene-4-carboxylic acid as its lactone , which can be methylated as the sodium salt, giving 5-methoxyphenanthrene-4-carboxylic acid, albeit in poor yield. New spectroscopic evidence (particularly 13C n.m.r.) confirms that 5-formylphenanthrene-4-carboxylic acid, which is an intermediate in the synthesis, exists as the lactol , 4-hydroxyphenanthro[4,5-cdeloxepin-G(4H)-one. 
