A
leaving group that carries away the bonding electron pair. For example, in the
hydrolysis of an alkyl chloride,
Cl−
is the nucleofuge. The tendency of atoms or groups to depart with the bonding electron
pair is called nucleofugality. The adjective is nucleofugal.
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1145