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High Quality Content by WIKIPEDIA articles! A nucleofuge is a leaving group which retains the lone pair from its previous bond with another species. For example, in the SN2 mechanism a nucleophile attacks an organic compound containing the nucleofuge (the bromo group) which simultaneously breaks the bond with the nucleofuge. After a reaction nucleofuges may contain either a negative or a neutral charge; this is governed by the nature of the specific reaction. The word 'nucleofuge' is commonly found in older literature, but its use is less common in current literature. An electrofuge is a leaving group which does not retain the bonding pair of electrons from its previous bond with another species. 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 is now uncommon.

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