
%0 Journal Article
%A Eade, RA 
%A Simes, JJH 
%A Stevenson, B 
%T Extractives of Australian Timbers. IV. Castanogenin (Medicagenic Acid) and Bayogenin, C<sub>30</sub>H<sub>48</sub>O<sub>5</sub>, from <I>Castanospermum australe</I> Cunn. et Fras
%J Australian Journal of Chemistry
%D 1963/10/01
%V 16
%N 5
%P 900-905
%K 
%R https://doi.org/10.1071/CH9630900
%U https://www.publish.csiro.au/paper/CH9630900 
%X Castanogenin, the major genin produced on hydrolysis of the saponin of Castanospermum australe Cunn, et Fras. is shown to be identical with medicagenic acid (2&#946;,3&#946;-dihydroxyolean-12-en-23,28-dioic acid). Further proof of several of the structural features of medicagenic acid is given. The minor sapogenin, bayogenin, C30H48O5, is shown to be 2&#946;,3&#946;,23-trihydroxyolean-12-en-28-oic acid by conversion into the same tetrol as is formed from medicagenic acid and by the formation of a &#947;-lactone by interaction of the carboxyl function and the 12,13-double bond. 
