
TY  - JOUR
A1  - Johns, SR 
A1  - Lamberton, JA 
A1  - Morton, TC 
A1  - Suares, H 
A1  - Willing, RI 
T1  - Triterpenes of <I>Lantana tiliaefolia</I>. 24-Hydroxy-3-oxours-12-en-28-oic acid, a new triterpene
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1983
VL  - 36
IS  - 12
SP  - 2537
EP  - 2547
KW  - 
UR  - https://doi.org/10.1071/CH9832537 
N2  - 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. 
ER  -

