This process can continue in a chain reaction until all the alkene has been converted to the brominated product. Overall, the allylic bromination of alkenes with NBS proceeds through a radical chain mechanism, and the regioselectivity of the reaction is determined by the stability of the resulting...
The source of the bromine atom, molecular bromine, is produced in low concentrations by NBS through a mechanism involving movement of both single electrons and pairs of electrons. Provide the missing arrows in the boxes to show how NBS (N-bromo...