Abstract
Regiospecific photodemethylation of the perylenequinone dimethylcercosporin (DMC0 (2) in methanol involved the two methoxy groups in ortho position to the carbonyl quinone functions, affording 2,11-dihydroxy-3,10-perylenequinone (3) and the dihydrofuran-containing derivative 4. When irradiated in acetonitrile in the presence of oxygen 2 was converted into two photooxidation products 5 and 7 whose structure was assigned on the basis of 13C-NMR studies.
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