draw the resonance structure of the three possible carbocation intermediate to show how methoxyl (-OCH3) diects bromination toward ortho and para position

We know that some substituted benzene reacts faster than benzene towards electrophillic substitution. This is often due to the activation of the benzene ring towards electrophillic substitution by resonance.

-OCH3 directs an incoming electrophile (such as during bromination) to the ortho or para position. This is made possible by resonance (mesomeric) effect as shown in the image attached to this answer.

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draw the resonance structure of the three possible carbocation intermediate to show how methoxyl (-OCH3) diects bromination toward ortho and para position​​

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draw the resonance structure of the three possible carbocation intermediate to show how methoxyl (-OCH3) diects bromination toward ortho and para position