Page "Chemical reaction" Paragraph 119
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In a rearrangement reaction, the carbon skeleton of a molecule is rearranged to give a structural isomer of the original molecule.
These include hydride shift reactions such as the Wagner-Meerwein rearrangement, where a hydrogen, alkyl or aryl group migrates from one carbon to a neighboring carbon.
Most rearrangements are associated with the breaking and formation of new carbon-carbon bonds.
Other examples are sigmatropic reaction such as the Cope rearrangement.
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