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Grade: 12th pass
        How is -NHCOCH3 is ortho para ring activating?
according to me.. the lone pair of electrons on nitrogen atom is in conjugation with the double bond of oxygen,,then howcome it is ring activating?
please explain
thanks :)
5 years ago

Answers : (1)

Aarti Gupta
askIITians Faculty
300 Points
							Activating groups are the substituents on the ring that donate 
electrons.Group -NHCOCH3 is an moderately activating group and ortho 
para directing. Activating groups speed up the reaction because ofthe 
resonance effect.
 The presence of the unpaired electrons that can be donated to the ring,
 stabilize the carbocation in the transition state. Thus; stabilizing 
the intermediate step, speeds up the reaction; and this is due to the 
decrease of the activating energy.The lone pair present on nitrogen atom
 is donating to the ring and stabilizing the carbocation.The combined 
effect of e- donation and resonance make it ring activating.
Thanks & Regards
Aarti Gupta
askiitians Faculty
5 years ago
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