This note covers essential, highly tested concepts for Free Radical Halogenation (FRH) (i.e. FR Bromination and Chlorination). Topics include:



1. The three mechanistic steps of FRH (Initiation, Propagation, Termination)

2. Single vs. double-headed arrows (i.e. electron-pushing diagrams)

3. Selectivity differences between FR Bromination and FR Chlorination

4. What is hv and NBS?

5. Radical resonance (aka “rearrangement”)