Electrophilic halogenation
Chemical reaction in which halogen substituents are added to aromatic molecules / From Wikipedia, the free encyclopedia
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In organic chemistry, an electrophilic aromatic halogenation is a type of electrophilic aromatic substitution. This organic reaction is typical of aromatic compounds and a very useful method for adding substituents to an aromatic system.
A few types of aromatic compounds, such as phenol, will react without a catalyst, but for typical benzene derivatives with less reactive substrates, a Lewis acid is required as a catalyst. Typical Lewis acid catalysts include AlCl3, FeCl3, FeBr3 and ZnCl2. These work by forming a highly electrophilic complex which is attacked by the benzene ring.