Bromination at the 5-position of the title compounds in aqueous sulphuric acid solutions involves rapid formation of an addition compound which undergoes slow acid-catalysed elimination to form the substitution product, which in turn may react further with an excess of bromine.
O. S. Tee and S. Banerjee, J. Chem. Soc., Chem. Commun., 1972, 1032 DOI: 10.1039/C39720001032
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