Allylic Bromination of Cyclohexene

Background Colour:


Removal of a hydrogen from an allylic position gives a much more stable delocalized allylic radical.

The allylic radical collects a bromine atom from a bromine molecule and produces a new bromine radical that can start a new series of reactions. Like the addition of HBr ,the reaction is a radical chain reaction, and only a small amount of Br2 needs to break down to Br• to initiate the reaction.

I. Saikia, A. J. Borah and P. Phukan, Chem. Rev., 2016, 116, 6837–7042.