Regiospecific bromination of benzene derivatives has been carried out with Me2SO–HBr; this method gives excellent yields of 2-bromobenzaldehyde and 2-bromonitrobenzene; strong ortho- and para-directing monosubstituted benzenes give para-bromo derivatives; a general discussion of the mechanism of these reactions is given.
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Srivastava et al. (1996) studied this question.
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