I was not able to find any explanation using resonance or aromaticity. All help is appreciated.
closed as off-topic by Mithoron, airhuff, Geoff Hutchison, a-cyclohexane-molecule, Todd Minehardt Jan 28 '18 at 3:30
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- "Homework questions must demonstrate some effort to understand the underlying concepts. For help asking a good homework question, see: How do I ask homework questions on Chemistry Stack Exchange?" – Mithoron, airhuff, Geoff Hutchison, a-cyclohexane-molecule, Todd Minehardt
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.