It has 4n electrons and is completely conjugated. It should be anti aromatic.
Why is this compound non-aromatic?
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4$\begingroup$ Pyrrole is aromatic because it has six electrons in its conjugated $\pi$ system. This thing has four. $\endgroup$ – Ivan Neretin Jan 26 '17 at 6:45
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$\begingroup$ @IvanNeretin This thing has 4 electrons, so it must be anti aromatic. Why it is non aromatic? $\endgroup$ – Arishta Jan 26 '17 at 9:13
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4$\begingroup$ Why should it be antiaromatic? It does not even have a cyclic conjugated $\pi$ system anymore. $\endgroup$ – Ivan Neretin Jan 26 '17 at 9:17
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$\begingroup$ Not fully conjugated. There is a saturated atom in the cycle. $\endgroup$ – Oscar Lanzi May 7 '17 at 22:24
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It is non-aromatic even though it has 4$\pi$ electrons because nitrogen cannot form five bonds. Hence delocalisation is not possible and so it is non aromatic.
