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Aromatic rings containing -NH(2)-NHR or ...

Aromatic rings containing `-NH_(2)-NHR or -NR_(2)` groups do not undergo Friedel-Crafts reaction. Why?

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`-NH_(2), -NHR and -NR_(2)` groups are electron releasing groups, but these are converted into powerful electron-attracting groups as a result of Lewis acid -Lewis base reaction with `AlCl_(3)`.
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