... Soc., Chem. Commun., 1980, 110-111. meta-Bromination of phenols in superacids. (Note: The full text of this document is currently only available in the PDF Version ). Jean-Claude Jacquesy, Marie-Paule Jouannetaud and Siki Makani. In SbF 5 –HF, para-alkylated or 2,6-dialkylated phenols (and their ethers) react with bromine to give the corresponding meta-bromo-substituted compounds; the mechanism implies bromination of the O-protonated substrate.
[Maleczka Jr., Robert E.; Shi, Feng; Holmes, Daniel; Smith III, Milton R. Journal of the American Chemical Society, 2003 , vol. 125, # 26 p. 7792 - 7793]