Halo-arenes

         In these elements the halogen is related directly to the carbon of the benzene nucleus.

Nomenclature : Unique name is aryl halide IUPAC name is halo-arene.

         Example :

 Methods of preparation

(i) By direct halogination of benzene ring 

            Lewis acid = FeX₃, AlX₃, Tl(OAC)₃; X₂ = Cl₂, Br₂

         (ii) From diazonium salts

        (iii) Hunsdiecker reaction :

         (iv) From Aryl thalium compound :

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