Radical reactions require an initial first step to get going. We call this reagent the radical initiator.
Chemical bonds can be cleaved in two ways: Heterolytically (ionic cleavage) and homolytically (radical cleavage).
Homolytic dissociation energy is much higher than a corresponding heterolytic dissociation energy.
Concept: What are Radical Initiators?4m
Radical initiators have relatively weak bonds that can be more easily cleaved by hemolysis.