(1b)Allylic Bromination (Allylic means adjacent to a C=C double bond) The bromination of cyclohexene produces a high yield of 3-bromocyclohexene. allylie positions allylic hydrogens HH H Br HBr cyclohexene 3-bromocyclohexene (80%) An allylic hydrogen has been substituted for a bromine. The bromine atom abstracts an allylic hydrogen because the allylic radical is resonance stabilized abstraction of allylic H cyclohexene allylic radica allylic bromide 620 The radical then reacts with a bromine molecule to continue the chain. Ch06 Alkyl Halides (landscape) Page 5Ch06 Alkyl Halides (landscape) Page 5 (1b) Allylic Bromination (Allylic means adjacent to a C=C double bond) The bromination of cyclohexene produces a high yield of 3-bromocyclohexene. An allylic hydrogen has been substituted for a bromine. The bromine atom abstracts an allylic hydrogen because the allylic radical is resonance stabilized. The radical then reacts with a bromine molecule to continue the chain