Bechamp reaction

In organic synthesis the Béchamp reaction is used for producing arsonic acids from activated aromatic substrates. The reaction is an electrophilic aromatic substitution, using arsenic acid as the electrophile. The reaction proceeds according to this idealized stoichiometry for the preparation of arsanilic acid:

C6H5NH2 + H3AsO4 → H2O3AsC6H4NH2 + H2O
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