
%0 Journal Article
%A Courtney, JL 
%A Stern, W 
%T Triterpenes of the friedelane series. VI. The structure of Friedelan-y-al
%J Australian Journal of Chemistry
%D 1966/09/01
%V 19
%N 9
%P 1709-1715
%K 
%R https://doi.org/10.1071/CH9661709
%U https://www.publish.csiro.au/paper/CH9661709 
%X The preparation of a number of compounds of the friedelane series having an oxygen function at C 24 is described. Mass spectrometric considerations indicate that friedelan-y-al is either friedelan-24-al or friedelan-25-al. A comparison shows that the C 24 derivatives are not identical with the natural products. The natural product must therefore have an oxygen function at C 25. Positive chemical proof of this assignment has been obtained by conversion of friedelane-3,x-dion- 25-oic acid into 5&#946;-hydroxyalnusane-3,x-dion-25-oic acid 5(25)-lactone. 
