Hell–Volhard–Zelinsky halogenation

Named reactionHalogenation

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The Hell–Volhard–Zelinsky halogenation reaction is a chemical transformation that transforms an alkyl carboxylic acid to the α-bromo derivative. It is a specialized and rare kind of halogenation.

Darzens halogenationNamed reaction
Alkyne via solid-liquid phase-transfer catalyzed dehydrohalogenation: acetylene dicarboxaldehyde tetramethyl acetal and acetylene dicarboxaldehyde dimethyl acetalOrg. Synth. Vol. 82, p. 179
Alkynes via phase transfer–catalyzed dehydrohalogenation: propiolaldehyde diethyl acetalOrg. Synth. Coll. Vol. 6, p. 954; Vol. 59, p. 10

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