March 28, 2024, 03:13:53 PM
Forum Rules: Read This Before Posting


Topic: Additional Resonance Structure?  (Read 723 times)

0 Members and 1 Guest are viewing this topic.

Offline FIDELIO

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-0
Additional Resonance Structure?
« on: May 20, 2020, 09:30:01 PM »
Is this solution missing an additional resonance structure?  I'm thinking about an additional one whereby pi bonds are simply moved around the ring.

Wouldn't we also want to show this additional resonance structure?

Thanks for the help.



 

Offline spirochete

  • Chemist
  • Full Member
  • *
  • Posts: 546
  • Mole Snacks: +51/-9
  • Gender: Male
Re: Additional Resonance Structure?
« Reply #1 on: May 27, 2020, 04:27:23 PM »
You are 100% correct. That is an additional resonance structure. It is equivalent to the other "most important" resonance contributor. So there are really two equally important resonance contributors.

I think this other resonance structure is "less interesting" in some ways because it doesn't show a separate atom carrying the negative charge. But that doesn't negate from the fact that it's a resonance contributor. In a  very rough sense, that resonance structure helps show the aromaticity of the benzene ring.

Offline hollytara

  • Chemist
  • Full Member
  • *
  • Posts: 317
  • Mole Snacks: +39/-0
Re: Additional Resonance Structure?
« Reply #2 on: May 27, 2020, 06:23:26 PM »
I think people sometimes leave off the other aromatic resonance structure because "everybody knows" it exists. 

But of course it is equally important to the one shown. 


Sponsored Links