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Non aromatic

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Having resonance doesn't mean something is aromatic, you also have to have a fully conjugated system. Have you drawn out the resonance structures? 

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Look here at the 'four rules'



Our last post in this series on aromaticity went through the 4 conditions a molecule must fulfill in order to be aromatic.

  • First, it must be cyclic
  • Second, every atom around the ring must have an available p-orbital
  • Third, the number of electrons in the pi system must be 2, 6, 10, 14, 18, or a higher number in the set that increases from 18 in increments of 4 (22, 26, 30…. etc). We usually abbreviate this as [4n+2] pi electrons.
  • Fourth, the molecule must be flat.

In that post we tried to explain what each of those rules meant – so if any of these individual items seem unclear to you, it might be a good idea to go back to that post.

In this post,we’re going to apply these 4 rules with some practice examples.

Look down the examples to cyclobutene (could you name your compound ? )

Can you find a cyclobutene that is aromatic?


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