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Michele Vang

How is 4H‐1,4‐oxazocine aromatic?

Declining USA  Follow

To check Aromaticity of a compound 4 criterias are to be checked

  1. Planarity : (Sp^2) Hybridised
  2. Conjugation: Compound should be fully conjugated
  3. Cyclic
  4. Hückel's Rule : There should be (4n+2)π electronsSo the above compound is planar, conjugated , cyclic and follows Huckel's Rule as One lone pair of O and one of N add upto 10π electrons which can be done when we put n=2

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Ashwini Budek  Follow

According to Huckel's rule Four Criteria for Aromaticity

The molecule needs to be (1) planar, (2) cyclic, (3) fully conjugated, and has (4) 4n+2 electrons.

Your molecule does not seem to be planar (b/c of N and O atoms) but assuming that it has a nearly planar conformation it satisfies all other criteria.You only need to count one of Oxygen's lone pair and the only Nitrogen lone pair:10=4*2+2So it could be aromatic (if it is nearly planar)

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