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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.
Two examples:

and:

The Zincke nitration should not be confused with the Zincke–Suhl reaction or the Zincke reaction.
References
References
- Zincke, Th.. (1900). "Ueber die Einwirkung von salpetriger Säure auf Brom- und Chlorderivate von Phenolen". [[J. Prakt. Chem.]].
- Zincke, Th.. (1900). "Ueber die Einwirkung von Salpetersäure auf Halogenderivate des ''p''-Kresols". [[J. Prakt. Chem.]].
- (1944). "The Nitration of Brominated Fluorophenols by the Zincke Method". [[J. Am. Chem. Soc.]].
- (1933). "Behavior of Mixed Halogenated Phenols in the Zincke Method of Nitration". [[J. Am. Chem. Soc.]].
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