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Topic: Nitrobenzene Carbocation Resonance Contributors  (Read 4900 times)

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Offline zeoblade

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Nitrobenzene Carbocation Resonance Contributors
« on: May 21, 2011, 08:56:05 PM »
Electrophilic Substitution to Nitrobenzene

I'm trying to draw the resonance contributors of nitrobenzene carbocation intermediate with the electrophile on the carbon with the hydrogen that it will substitute. I know nitro is meta director and I'm trying to convince myself diagrammatically how the charges distribute if the electrophile adds in each case of ortho/para- and meta-positions.

So far I can draw 5 contributors when electrophile and hydrogen are in ortho/para-positions but I feel I'm getting a little stuck with how the arrows should be drawn and which heteroatoms should be carrying what charge. I can see that there are adjacent positive charges that is a bad situation. When it comes to the meta-position where its most stable, I can draw the contributors in the ring so that the positive charges are not adjacent to each other. But I have trouble accounting and drawing the nitro group resonance.

Its uncomfortable to try to visualise from words what I'm trying to do. When I get to school, I'll scan my attempt if someone could provide critical feedback, but if anyone knows some pictures online or has a scanned diagram so that I can compare, I'd really appreciate it.

Offline Xede

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Re: Nitrobenzene Carbocation Resonance Contributors
« Reply #1 on: May 21, 2011, 09:03:45 PM »
go to google.

Offline zeoblade

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Re: Nitrobenzene Carbocation Resonance Contributors
« Reply #2 on: May 21, 2011, 09:06:09 PM »
I've looked and can only find the resonance contributor without the electrophile on there, so that's why I asked in this thread

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