(1) The (usually intramolecular) transfer of an atom or group during the course of a molecular rearrangement.
(2) The movement of a bond to a new position, within the same molecular entity, is known as "bond migration".
Allylic rearrangements, e.g.,
RCH=CHCH2X ![[arrow]](/img3/M_files/ARROW.gif){kind=icon}
RCH(X)CH=CH2
exemplify both types of migration.
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