N‐Bromosaccharin in the presence of pyridinium poly(hydrogen fluoride) can be used for monobromination of ethyl esters of 6‐ and 7‐substituted‐4‐oxo‐1,4‐dihydroquinoline‐3‐carboxylic acids. The reactions take place at the C6 or C8 positions, depending on the types and positions of the substituents.
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MOZEK et al. (1994) studied this question.
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