electrofuge

The word 'electrofuge' is commonly found in older literature, but its use is now uncommon.

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.

A nitrogen bound to both a good electrofuge and a good nucleofuge is known as a nitrenoid (for its resemblance to a nitrene).

In chemistry, a Grob fragmentation is an elimination reaction that breaks a neutral aliphatic chain into three fragments: a positive ion spanning atoms 1 and 2 (the "electrofuge"), an unsaturated neutral fragment spanning positions 3 and 4, and a negative ion (the "nucleofuge") comprising the rest of the chain.