
%0 Journal Article
%A Elix, JA 
%A Jiang, H 
%A Wardlaw, JH 
%T A New Synthesis of Xanthones. 2,4,7-Trichloronorlichexanthone and 4,5,7-Trichloronorlichexanthone, Two New Lichen Xanthones
%J Australian Journal of Chemistry
%D 1990/10/01
%V 43
%N 10
%P 1745-1758
%K 
%R https://doi.org/10.1071/CH9901745
%U https://www.publish.csiro.au/paper/CH9901745 
%X A new synthetic route to norlichexanthone (1,3,6-trihydroxy-8-methyl- 9H-xanthen-9-one) derivatives has been developed by using a Smiles rearrangement of an appropriately substituted depside in the key step. 2,4,7-Trichloronorlichexanthone (22) and 4,5,7- trichloronorlichexanthone (29) have been prepared by this method. The former xanthone (22) was shown to be a constituent of the lichens Lecanora sulphurata and L. flavo-pallescens and the latter (29) a constituent of Micarea austroternaria var. isabellina. 
