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Migration of one group from one atom to another within
the molecule
Ø Generally the migrating group never leaves the molecule
Ø There are five types of skeletal rearrangements-
1. Electron deficient skeletal rearrangement
2. Electron rich skeletal rearrangement
3. Radical rearrangement
4. Rearrangements on an aromatic ring
5. Sigmatropic rearrangement
Electron Deficient Skeletal Rearrangement
Molecular Rearrangements
Ø Generally it involves migration of a group from one atom to
an adjacent atom, having six electrons in the valence shell
Ø The molecular system may be either a cation or a neutral
molecule
Examples: