Migratory aptitude

[1] Migratory aptitudes vary in different reactions, depending on multiple factors.

[2] In the Baeyer-Villiger reaction, the more substituted group, in general, migrates.

For example, relative migratory aptitudes for alkyl substituents is Hydride >C(CH3)3> C2H5 > phenyl > CH3.

[2] More bulky groups have more tendency to migrate.

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