As a result of the analysis of 13C n.m.r. spectra, a new structure (7) is preferred for the purple pigments obtained by the reactions of 2-(2-oxoindolin-3-yl)glyoxylates with acetic anhydride in the presence of pyridine. A mechanistic rationalisation of the formation of the pigments and their unusual rearrangement on oxidation with chromic acid are discussed.
J. A. Ballantine, J. Chem. Soc., Perkin Trans. 1, 1979, 1182 DOI: 10.1039/P19790001182
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