Free Radical Halogenation on Benzene

[deleted518758]

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Hi Everyone! Can someone explain the rules of free radical halogenation on a benzene ring? Why does it not do EAS? I would think that it would add ortho or para since the ethyl group is activating...

 

[HdK]

there are a few ways free radicals are used in DAT. one is normal 3 > 2 > 1 halogenation, and in a benzne ring, where you choose the allylic, or even a ring that's not aromatic, it's allylic attachment.