
TY  - JOUR
A1  - Wilkins, AL 
A1  - Elix, JA 
A1  - Whitton, AA 
T1  - A One- and Two-Dimensional <sup>1</sup>H and <sup>13</sup>C N.M.R. Study of Some Lichen Triterpenoids of the Pyxinol Group
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1990
VL  - 43
IS  - 2
SP  - 411
EP  - 417
KW  - 
UR  - https://doi.org/10.1071/CH9900411 
N2  - A complete assignment of the 13C and 1H n.m.r. resonances of the lichen triterpenoids, pyxinol, 3,25-di-O-acetylpyxinol and 3,12,25-tri-O-acetylpyxinol has been achieved by using a combination of one- and two-dimensional n.m.r. data and T1 values. Hydrogen bonding between the 12&#946;- hydroxy group and the carbonyl oxygen of the 25-acetoxy group of 3,25- di-O-acetylpyxinol leads to the furan ring system adopting a  conformation different from that adopted by 25-hydroxy analogues, hence differing chemical shifts are observed for some of the carbons of rings C and D and the furan ring. 
ER  -

