There is also "Simple and practical halogenation of arenes, alkenes and alkynes with hydrohalic acid/H2O2 (or TBHP)", N B Barhate et al, Tetrahedron 55 (1999) 11127-11142. It is mentioned on Rh's site.
Standard procure: N,N-dimethyl-(2-bromo-5-methoxy)benzamide: A solution of TBHP (70% aq, 0.15 mL, 1.17 mmol) was added to a cooled mixture of HBr (48% aq, 0.20 mL, 1.17 mmol) in MeOH (5 mL) and the mixture stirred for 5 min. To this solution N,N-dimethyl(3-methoxy)benzamide (0.21 g, 1.17 mmol) was added, stirred for 30 min and then refluxed for 6 h. On completion of the reaction (TLC) the solvent was evaporated and the product taken in 5 mL water, extracted with dichloromethane (3 x 15 mL) and residue was purified by flash column chromatography over silica gel (10% EtOAc in petroleum ether) to affor pure product as thick yellow oil (0.28 g. 98%)
1,4-dimethoxybenzene can be brominated following this procedure.
- TBHP (4.0 eq), HBr (4.0 eq) -> 2,5-dibromo-1,4-dimethoxybenzene, 98% yield
- H2O2 (4.0 eq), HBr (4.0 eq) -> 2,5-dibromo-1,4-dimethoxybenzene, 99% yield
- TBHP (1.0 eq), HBr (1.0 eq) -> 2-bromo-1,4-dimethoxybenzene, 89% yield
(TBHP = tert-butylhydroperoxide, 70%)