Free-Radical Initiation The peroxide bond breaks homolytically to form the first radical: R-O—O—R heat> R一O·+·O一R R一O·+H一Br >R—O—H+Br Copyright 2010 Pearson Prentice Hall,Inc. Hydrogen is abstracted from HBr. Chapter8 10Chapter 8 10 Free-Radical Initiation • The peroxide bond breaks homolytically to form the first radical: • Hydrogen is abstracted from HBr