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Phophorine seems aromatic as it has 6 conjugated electrons. But the answer given is that it is not. This seems odd since pyridine has a similar structure and is also aromatic. Thus I ask is phospohrine aromatic or not?

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    $\begingroup$ Phosphinine is aromatic, but somewhat less than benzene. $\endgroup$ – mykhal Nov 23 '18 at 16:23
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Phosphorine (IUPAC: phosphinine) actually has aromatic character nearly as great (88%) as that of benzene. According to the reference, phosphorine is sufficiently stable to be handled without air-free techniques; and it undergoes electrophilic substitution reactions similar to those of benzene.

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    $\begingroup$ With reference you mean the Wikipedia article? I have quite a bit of trouble believing this answer without knowing the context in which these 88% of aromatic character came about. Since there isn't even an agreed-upon rigorous definition of aromaticity, the number is without context equally as informative as a picked number from the phone book. $\endgroup$ – Martin - マーチン Dec 4 '18 at 16:38
  • $\begingroup$ So ... you apparently think this is not aromatic? $\endgroup$ – Oscar Lanzi Dec 5 '18 at 0:38
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    $\begingroup$ No, that is not what I said. I just don't have any trust in that assessment of the 88% without any context of how this number came about. $\endgroup$ – Martin - マーチン Dec 5 '18 at 9:22

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