
%0 Journal Article
%A Johns, SR 
%A Lamberton, JA 
%A Morton, TC 
%A Suares, H 
%A Willing, RI 
%T Triterpenes of <I>Lantana tiliaefolia</I>. 24-Hydroxy-3-oxours-12-en-28-oic acid, a new triterpene
%J Australian Journal of Chemistry
%D 1983/12/01
%V 36
%N 12
%P 2537-2547
%K 
%R https://doi.org/10.1071/CH9832537
%U https://www.publish.csiro.au/paper/CH9832537 
%X The known triterpenes ursonic acid, oleanonic acid, ursolic acid, oleanolic acid and 24-hydroxy-3-oxoolean-12-en-28-oic acid occur in Lantana tiliaefolia Cham., together with a new triterpene,24-hydroxy-3-oxours-12-en-28-oic acid. A detailed 13C n.m.r. study has been made of a number of olean-12-enes and urs-12-enes, and the 1H n.m.r. signals from the secondary methyl groups in urs-12-enes have been investigated. N.m.r. evidence shows significant conformational differences in ring A between a number of 3-oxo derivatives that differ in their ring A substituents. Methyl ursonate and methyl oleanonate have been separated on columns of Spherosorb A5Y alumina. 
