[Mikez]

I am trying to figure out if these 2 molecules are aromatic
http://www.molport.com/buy-chemicals/directory-molecule-image/3928131/w:170/h:170

The problem is there's 2 resonance forms for the dione (2 oxygen ketones), 1 that makes it anti-aromatic and one that makes it aromatic.
*electron moves down to carbon on 1 side. moves up to oxygen on the other side
*electrons move up to oxygen
-I know that molecules are most stable as aromatic but resonance is best going to oxygen.

How do I tell which one to go with?

thanks

[Honclbrif]

If I understand what you're saying correctly, "electron moves down to carbon on 1 side. moves up to oxygen on the other side", sounds like you're moving an electron pair off of an oxygen and use it to make a bond to carbon. This would result in a carbon with 5 bonds which is usually a bad bet.

[AMEDIO]

i doubt if the second one is aromatic???