Aryl Halides

Preparation

From Diazonium salts

Halogenation

Iodination with arylthallium compounds

Reactions

Formation of Grignard reagents

Substitution in the ring

X is a deactivating o,p director

Nucleophilic substitution of X, bimolecular displacement

Occurs only when:

Nucleophilic substitution by elimination-addition