A substitution reaction occurring at position 1/ of an allylic system, the double bond being between positions 2/ and 3/. The incoming group may be attached to the same atom 1/ as the leaving group, or the incoming group becomes attached at the relative position 3/, with movement of the double bond from 2/3 to 1/2. For example:
CH3CH=CHCH2Br ![[arrow]](/img3/A_files/ARROW.gif){kind=icon}
CH3CH=CHCH2OAc
or
CH3CH=CHCH2Br CH3CH(OAc)CH=CH2
(written as a transformation).
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