G. Majetich et al., ELECTROPHILIC AROMATIC BROMINATION USING BROMODIMETHYLSULFONIUM BROMIDE GENERATED IN-SITU, Journal of organic chemistry, 62(13), 1997, pp. 4321-4326
It has been shown that bromodimethylsulfonium bromide, generated in si
tu by treating dimethyl sulfoxide with aqueous hydrobromic acid, is a
milder and more selective reagent for electrophilic aromatic brominati
on than elemental bromine.