Free Radical Initiation 1111 Peroxide O-O bond breaks easily to form free radicals. R-OOR heat R-O·+·O-R Hydrogen is abstracted from HBr. R-0.Br R-O-H Br => Chapter 8 Electrophile 9 Chapter 8 9 Free Radical Initiation • Peroxide O-O bond breaks easily to form free radicals. R O + H Br R O H + Br R O O R R O + O R heat • Hydrogen is abstracted from HBr. Electrophile =>