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Why do only activating groups can rearrange to form a more stable carbocation?

as it shows in the picture the activating group rearranged to form a tertiary carbocation but not the benzene or nitrobenzyl group (for being less activating/deactivating), can someone explain why? this whole thing is new to me, I thought only methyl or hydride shift can happen. Thanks a lot!!

Categories
Ask Chemistry

Why do only activating groups can rearrange to form a more stable carbocation?

as it shows in the picture the activating group rearranged to form a tertiary carbocation but not the benzene or nitrobenzyl group (for being less activating/deactivating), can someone explain why? this whole thing is new to me, I thought only methyl or hydride shift can happen. Thanks a lot!!

Categories
Ask Chemistry

Why do only activating groups can rearrange to form a more stable carbocation?

as it shows in the picture the activating group rearranged to form a tertiary carbocation but not the benzene or nitrobenzyl group (for being less activating/deactivating), can someone explain why? this whole thing is new to me, I thought only methyl or hydride shift can happen. Thanks a lot!!