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NH2 is electron acceptor or electron donor?

by kelvin macks
Tags: acceptor, donor, electron
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kelvin macks
#1
Jun13-14, 07:13 AM
P: 60
i have attached 2 photos here...

the book said the NH2 exhibit negative inductive effect (negative inductive effect means electron acceptor) , and is ring activating group, but ring activating group is electron donor. which is correct?

So NH2 is electron donor or electron acceptor?
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IMG_20140613_075729[1].jpg   IMG_20140613_075806[1].jpg  
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Lok
#2
Jun13-14, 04:09 PM
P: 441
They were supposed to imply "generally".
kelvin macks
#3
Jun13-14, 09:07 PM
P: 60
Quote Quote by Lok View Post
They were supposed to imply "generally".
can you explain more detailed?

DrClaude
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Jun14-14, 01:57 PM
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NH2 is electron acceptor or electron donor?

Quote Quote by kelvin macks View Post
So NH2 is electron donor or electron acceptor?
Both! While NH2 is a negative inductor, there is a resonance structure between NH2 and benzene that makes it a ring activator (the resonance dominates over the electronegativity).

You can find a nice picture of the resonance here: http://www.chm.wright.edu/feld/chm212/eas.pdf


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