Catalyst and solvent-free bromination of toluene derivatives by HBr–H 2 O 2 with visible-light photocatalysis using a continuous-flow micro reactor

The efficiency of the bromination of toluene derivatives has been improved significantly by utilising a combination of hydrogen peroxide (30%) and hydrogen bromide (40%) in a continuous-flow micro reactor. This catalyst and solvent-free reaction takes place by visible-light photocatalysis.