mundane Posted August 8, 2020 Share Posted August 8, 2020 why is the compound non aromatic despite it having resonance? Link to comment Share on other sites More sharing options...
hypervalent_iodine Posted August 8, 2020 Share Posted August 8, 2020 Having resonance doesn't mean something is aromatic, you also have to have a fully conjugated system. Have you drawn out the resonance structures? Link to comment Share on other sites More sharing options...
studiot Posted August 8, 2020 Share Posted August 8, 2020 Look here at the 'four rules' https://www.masterorganicchemistry.com/2017/03/03/is-this-molecule-aromatic-some-practice-problems/ Quote 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? Link to comment Share on other sites More sharing options...
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