
TY  - JOUR
A1  - Jones, AJ 
A1  - Elix, JA 
A1  - Engkaninan, U 
T1  - The structure of the lichen depsidone hydroxyphysodic acid. A carbon-13 magnetic resonance study
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1976
VL  - 29
IS  - 9
SP  - 1947
EP  - 1954
KW  - 
UR  - https://doi.org/10.1071/CH9761947 
N2  - Unequivocal evidence for the structure of the lichen depsidone 3-hydroxyphysodic acid has been provided by analysis of long-range carbon-13-hydrogen coupling interactions and carbon-13 chemical shifts. This approach was also used to establish the isocoumarin structure (16) for that of the key decarboxycyclodehydration product obtained by degradation of 3-hydroxyphysodic acid. The breakdown of some carbon-13 additivity effects in the sterically congested ring is discussed. A possible mechanism for the formation of the isocoumarin (16) is outlined. 
ER  -

