The presence of radicals in some familiar looking addition reactions can completely change the product.
Concept #1: The general mechanism of Allylic Halogenation.
Remember our friendly addition reaction halogenation? Notice that you achieve a vicinal dihalide in this reaction.
Now we see this reaction. Note that the only difference is the presence of a radical initiator.
This one added condition will lead to the formation of a mixture of allylic alkyl halides. Here’s the full mechanism:
Concept #2: The products of Allylic Chlorination.
Concept #3: Mechanism of Allylic Bromination.
Predict the product(s) of the following reaction.
Example #1: Predict the product(s) of the following reaction.