
%0 Journal Article
%A Elix, John A. 
%A Barclay, Caroline E. 
%A Wardlaw, Judith H. 
%A Archer, Alan W. 
%A Yu, Sen-hua 
%A Kantvilas, Gintaras 
%T Four New &#946;-Orcinol <emph type="2">meta</emph>-Depsides from <emph type="2">Pertusaria</emph> and <emph type="2">Siphula</emph> Lichens
%J Australian Journal of Chemistry
%D 1999/11/11
%V 52
%N 9
%P 837-840
%K 
%R https://doi.org/10.1071/CH99085
%U https://www.publish.csiro.au/paper/CH99085 
%X The new depsides decarboxyhypothamnolic acid &#91;3-(2&#8242;,4&#8242;-dihydroxy-3&#8242;,6&#8242;-dimethylphenyloxycarbonyl)-2- hydroxy-6-methoxy-4-methylbenzoic acid&#93; (4) and cryptothamnolic acid &#91;3-(3&#8242;-formyl-2&#8242;-hydroxy-4&#8242;-methoxy- 6&#8242;-methylbenzoyloxy)-4,6-dihydroxy-2,5-dimethylbenzoic acid&#93; (6) have been detected in extracts of a Chinese Pertusaria species together with hypothamnolic acid (3) and their structures implied by means of chromatographic and spectroscopic comparisons with synthetic materials. Two further new depsides, neothamnolic acid &#91;3-(5&#8242;,7&#8242;- dihydroxy-6&#8242; -methyl-1&#8242; -oxo-1&#8242; ,3&#8242; -dihydroisobenzofuran-4&#8242; -yloxycarbonyl)-2-hydroxy-6-methoxy-4- methylbenzoic acid&#93; (8) and lactothamnolic acid &#91;3-(6&#8242;-formyl-5&#8242;,7&#8242;-dihydroxy-1&#8242;-oxo-1&#8242;,3&#8242;-dihydroisobenzo- furan-4&#8242;-yloxycarbonyl)-2-hydroxy-6-methoxy-4-methylbenzoic acid&#93; (9), have been isolated from the lichen Siphula ramalinoides, and the structure of these compounds followed from a combination of spectroscopic data, derivatization and degradation experiments. 
