15.03.2: Activating, Ortho, Para-Directing Substituents
- Page ID
- 23587
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If electrophilic aromatic substitution of a monosubstituted benzene is faster than that of benzene under identical conditions, the substituent in the monosubstituted benzene is called an activating group.
eg:
Under identical conditions, Reaction 2 is faster than Reaction 1. Thus, the methyl group is an activating group.
All activating groups are electron-donating groups.
Common activating groups:
