Friedel Crafts alkylation is also an electrophilic substitution reaction in which a alkyl group replaces a hydrogen atom on a benzene ring. The Friedel Crafts alkylation requires the use of a catalyst to form the electrophile from the alkyl halide and anhydrous aluminium chloride is normally used for this purpose. The electrophile (R+) is formed according to the following equation: RX + AlCl3 R+ + AlCl4.
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