In chemistry, an electrofuge is a leaving group which does not retain the lone pair of electrons from its previous bond with another species (in contrast to a nucleofuge, which does). It can result from the heterolytic breaking of covalent bonds. After this reaction an electrofuge may possess either a positive or a neutral charge; this is governed by the nature of the specific reaction.
An example would be the loss of H+ from a molecule of benzene during nitration.
The word 'electrofuge' is commonly found in older literature, but its use in contemporary organic chemistry is now uncommon.
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5-2 Chimie organique - Substitution électrophile aromatique 2 - Réactivité et régiosélectivité
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Lewis Acids, Lewis Bases & Lewis Acid/Base Complexes
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References
- Nič, Miloslav; Jirát, Jiří; Košata, Bedřich; Jenkins, Aubrey; McNaught, Alan (2009), IUPAC Gold Book definition of Electrofuge, doi:10.1351/goldbook.E01965.