What are the tautomeric forms of the synthesized diimines, and which form is most stable?

Label:chem

Topic
Understanding the tautomeric forms and their stability is crucial for predicting the behavior of diimines in various chemical reactions and environments.
Answer
The synthesized diimines can exist in three possible tautomeric forms: II (keto form), III (enolic form), and IV (another enolic form). Theoretical calculations using the B3LYP/6-31G(d,p) level of theory indicate that the enolic forms (III and IV) are the most stable, with nearly similar energies, while the keto form (II) is less stable. The stability of the enolic forms is attributed to conjugation through the N=C–C=CH–NH system.
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