"A consequence of delocalization is that resonance-stabilized allylic intermediates can readily participate in reactions of unsaturated molecules. (...) These conditions slow the ionic addition pathway sufficiently to allow a faster radical chain mechanism to take over, leading to radical allylic substitution."
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K. Peter C. Vollhardt, Neil E. Schore (2011) Organic chemistry : structure and function 6th ed. Ch. 14 : Delocalized Pi Systems
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Allyl
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