In the given reaction,at which position does | vedclass

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(A) The reaction involves allylic bromination using $NBS$ ($N$-Bromosuccinimide),which proceeds via a free radical mechanism.The reaction proceeds thr

Vedclass · Accepted Answer

$a$

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(A) The reaction involves allylic bromination using $NBS$ ($N$-Bromosuccinimide),which proceeds via a free radical mechanism.The reaction proceeds through the formation of the most stable allylic free radical.Removing a hydrogen atom from position $a$ generates a $3^o$ allylic free radical,which is stabilized by resonance with the adjacent double bond.Since the $3^o$ allylic free radical is more stable than other possible radicals,bromination occurs preferentially at position $a$.

In the given reaction,at which position does bromination take place?

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