Preparation of Alkyl Halides Free radical halogenation (Chapter 4) -Chlorination produces a mixtures of products. This reaction is not a good lab synthesis,except in alkanes where all hydrogens are equivalent. Bromination is highly selective. Free radical allylic halogenation Halogen is placed on a carbon directly attached to the double bond (allylic). 2013 Pearson Education Inc. 18Preparation of Alkyl Halides • Free radical halogenation (Chapter 4) – Chlorination produces a mixtures of products. This reaction is not a good lab synthesis, except in alkanes where all hydrogens are equivalent. – Bromination is highly selective. • Free radical allylic halogenation – Halogen is placed on a carbon directly attached to the double bond (allylic). 18 © 2013 Pearson Education Inc