Structure of the lichen depsidone pannarin
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The published structure of pannarin(2-chloro-6-hydroxy-3-methoxy-1,4,8-trimethyl-11-oxo-11H-dibenzo[b, e]-[1,4]dioxepin-7-carbaldehyde)(1) is revised to 2-chloro-3-hydroxy-8-methoxy-1,6,9-trimethyl-11-oxo-11H-dibenzo[b, e][1,4]dioxepin-4-carbaldehyde (21), in the light of a combination of degradative, spectroscopic, and synthetic studies. The utility of mass spectrometry and high resolution n.m.r. spectroscopy in depsidone structural determination is discussed.
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Journal of the Chemical Society, Perkin Transactions 1