If you dont want to use elemental Br (albeit nasty, its not the worst thing...
), use
NBS:
Post 71830 (missing)
(Rhodium: "2C-B and 2C-C with N-halosuccinimide", Methods Discourse)And there are plenty of modifications around for halogenation of alkoxy subst. aromatics w/ halosuccinimides.
If you want to use your household HBr sol.
, than add the oxidizer of your choice (H2O2 sol., KMnO4, K2Cr2O7, MnO2), and condense the Br2 in a cold trap (fumes led outside
). Of course consider the concentration of the HBr sol, etc...