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Deactivating Group

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  • If electrophilic aromatic substitution of a monosubstituted benzene is slower than that of benzene under identical conditions, the substituent in the monosubstituted benzene is called a deactivating group.




    Under identical conditions, Reaction 2 is slower than Reaction 1.  Thus, the nitro group is a deactivating group.

    All deactivating groups are electron-withdrawing groups.

    Common deactivating groups:



    see also activating group, ortho, para directing group, meta directing group