Bromination Mechanism Step 1:Formation of a stronger electrophile. :B-Br:FeBr :Br-Br-FeBr Br2FeBr,intermediate (a stronger electrophile than Br,) Step 2:Electrophilic attack and formation of the sigma complex. H B H :Br-CBr-FeBr H +FeBra H H H 人 sigma complex Step 3:Loss of a proton gives the products H FeBra Br H H H +FeBr3 bromobenzeneBromination Mechanism