Allylic Bromination (NBS): Selective Radical Substitution at Allylic Sites
Master allylic bromination with NBS: radical chain mechanism, why it targets allylic positions, and how resonance creates product mixtures. Includes interactive steps + practice.
Reagents: NBS, hv (or peroxide), often in solvent like CCl4
Selectivity: Targets allylic (and benzylic) positions due to radical stabilization
Mechanism type: Radical chain; Br2 generated in situ
Common outcome: Mixture of allylic bromides due to resonance