Migratory aptitude

Migratory aptitude is the relative ability of a migrating group to migrate in a rearrangement reaction. This can be affected by the leaving group (whichever gives a more stable carbocation) depends upon the electron density of the migrating group i.e.Hydride = Phenyl > Tert-Alkyl > Sec-Alkyl > Primary Alkyl > Methyl Migratory aptitude is the relative ability of a migrating group to migrate in a rearrangement reaction. This can be affected by the leaving group (whichever gives a more stable carbocation) depends upon the electron density of the migrating group i.e.Hydride = Phenyl > Tert-Alkyl > Sec-Alkyl > Primary Alkyl > Methyl The migratory groups follow the order of increasing stability of carbocation instead of carbanion (except phenyl). The real deciding factor is increased electron density at anionic carbon. The more the electron releasing group the more is the migratory aptitude.