Nuclear oxidation in flavones and related compounds - Part XXXIX. Occurrence of nuclear oxidation in the biogenesis of lichen acids
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Typical examples from lichen acids illustrating the applicability of the methods of para and ortho oxidation are studied. They follow the schemes of biogenesis given earlier and are found to proceed satisfactorily, thus providing convenient methods of synthesis. The common origin of CH3, CH2OH, CHO, and COOH and also of a hydroxyl group is emphasised.