The nitrous acid catalysed nitration of 4-nitrophenol in trifluoroacetic acid leads to ca. 22%ipso-attack at the 4-position followed by a 1,3-rearrangement that appears to be intramolecular.
A. H. Clemens, J. H. Ridd and J. P. B. Sandall, J. Chem. Soc., Chem. Commun., 1983, 343 DOI: 10.1039/C39830000343
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