Author:
Jones AJ,Elix JA,Engkaninan U
Abstract
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.
Cited by
26 articles.
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