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allylic substitution

allylic substitution [ORG CHEM] A reaction occurring at position 1 of an allylic system
(with the double bond between positions 2 and 3) in which the incoming group is
attached to the same atom (position 1) as the leaving group, or the incoming group
is attached at position 3, with the double bond moving from positions 2 and 3 to
positions 1 and 2.