Diazonium Salts to Functionalize Benzene. While we don’t often wish to prepare a nitro compound (unless our goal is to design explosives), the nitro group can be converted to a wide variety of different substituents via a three-step process:
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when making Ar-N2+)
This is the only way to prevent Cl from adding para to –OCH3.
Alternately, sodium dichromate (Na2Cr2O7) and sulfuric acid can be used in place of the KMnO4/hydroxide mixture.