Abstract Bromination of aromatic hydrocarbons is triggered by Vilsmeier–Haack reagent [N, N-dimethyl formamide (DMF–POCl3 system)] in the presence of KBr or N-bromosuccinimide (NBS) under solvent-free conditions by grinding the reactants in a mortar with a pestle. The reactions afforded corresponding bromo derivatives in very good yield with high regioselectivity. The results are comparable with those obtained under reflux conditions.
