自秋转达对 Allylic Halogenation allylic positions allylic hydrogens HH H Br2 w HBr cyclohexene H 3-bromocyclohexene (80%) Copyright 2010 Pearson Prentice Hall,Inc. Allylic radical is resonance stabilized. Bromination occurs with good yield at the allylic position (sp3 C next to C=C).Allylic Halogenation ◼Allylic radical is resonance stabilized. ◼Bromination occurs with good yield at the allylic position (sp3 C next to C=C)