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ALLYLIC SYSTEMS THEORY
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The group CH2=CHCH2- is called allyl. Some compounds that derive from the allyl group are:

 
allyl system 01
 
[1] Allyl bromide
[2] Allyl alcohol
[3] Allyl chloride
 
The term allylic position is also used to designate the neighboring position of a double bond. Hydrogens located in that position are called allylic hydrogens ( H ).
 
allyl system 02
 
The carbons located in the allylic position are called allylic carbons (*).
 
Carbocations, carbanions and radicals formed in allylic positions are stabilized by delocalizing the charge by resonance.
 
allyl system 03
 
[4] Allyl cation
[5] Allyl anion
[6] Allyl radical