Zincke nitration

The Zincke nitration is a nitration reaction in which a bromine is replaced by a nitro group on an electron-rich aryl compound such as a phenol or cresol. Typical reagents are nitrous acid or sodium nitrite. The reaction is a manifestation of nucleophilic aromatic substitution and is named after Theodor Zincke, who first reported it in 1900.^[1][2]

Two examples:^[3]

and:^[4]

The Zincke nitration should not be confused with the Zincke–Suhl reaction or the Zincke reaction.