Mechanism for the Bromination of Benzene:Steps 2 and 3 Step 2:Electrophilic attack and formation of the sigma complex. H H -FeBr3 Br FeBr4 H H Step 3:Loss of a proton to give the products. FeBr4 H Br Br FeBr3 +HBr H H H Chapter 17 6 Chapter 17 6 H H H H H H Br Br FeBr3 H H H H H H Br + FeBr4 - H H H H H H Br FeBr4 - Br H H H H H + FeBr3 + HBr Step 2: Electrophilic attack and formation of the sigma complex. Step 3: Loss of a proton to give the products. Mechanism for the Bromination of Benzene: Steps 2 and 3