Comparison of stability of cyclic imines [closed]








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[![enter image description here](https://i.stack.imgur.com/HWT5l.png)](https://i.stack.imgur.com/HWT5l.png)
I am looking for the reason for the lowest stability of cyclohexane-1,3,5-triimine (D).


I was not able to find any explanation using resonance or aromaticity.
All help is appreciated.




The cyclohexane-1,3,5-triimine tautomer is benzene-1,3,5-triamine, which is aromatic. This makes this trienamine form much more stable than any of the other possible tautomeric forms.


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