Reaction of the 1-substituted 1H-pyrrol-3(2H)-ones 6 and 7 with diazonium salts under acidic conditions gives rise to 2-coupled products, which are shown by X-ray crystallography to adopt the ketohydrazone structures 9–11K.
A. J. Blake, H. McNab and L. C. Monahan, J. Chem. Soc., Perkin Trans. 1, 1991, 701 DOI: 10.1039/P19910000701
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