In the absence of nitrous acid traps, the nitration of phenol in 56·2% sulphuric acid displays autocatalytic behaviour; on the other hand, the isomer ratio of the products is inconsistent with the commonly accepted prior nitrosation scheme, and some other route for the promotion of nitration must be operative.
D. S. Ross, G. P. Hum and W. G. Blucher, J. Chem. Soc., Chem. Commun., 1980, 532 DOI: 10.1039/C39800000532
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