AskDefine | Define halogenation

User Contributed Dictionary



  1. The reaction of a halogen with something, especially the replacement of a hydrogen atom of an organic compound with a halogen one.

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Extensive Definition

Halogenation is a chemical reaction that incorporates a halogen atom into a molecule. More specific descriptions exist that specify the type of halogen: fluorination, chlorination, bromination, and iodination.
In a Markovnikov addition reaction, a halogen like bromine is reacted with an alkene which causes the π-bond to break forming an haloalkane. This makes the hydrocarbon more reactive and bromine as it turns out, is a good leaving group in further chemical reactions such as nucleophilic aliphatic substitution reactions and elimination reactions
Several main types of halogenation exist, including:
Specific halogenation methods are the Hunsdiecker reaction (from carboxylic acids) and the Sandmeyer reaction (arylhalides).
An example of halogenation can be found in the organic synthesis of the anesthetic halothane from trichloroethylene which involves a high temperature bromination in the second step :


halogenation in German: Halogenierung
halogenation in Spanish: Halogenación
halogenation in Italian: Alogenazione
halogenation in Hebrew: הלוגנציה
halogenation in Latvian: Halogenēšana
halogenation in Dutch: Halogeneren
halogenation in Norwegian: Halogenering
halogenation in Polish: Halogenowanie
halogenation in Portuguese: Halogenação
halogenation in Slovak: Chlorácia
halogenation in Finnish: Halogenointi
halogenation in Swedish: Halogenering
halogenation in Chinese: 卤化
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