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allylic substitution reaction definition
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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 CH3CH=CHCH2OAcor

CH3CH=CHCH2Br CH3CH(OAc)CH=CH2(written as a transformation).

See also:
alkanes definition
Alkynes definition
aliphatic compounds definition
afocal system definition
alkenes definition
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