How are symmetrical and non-symmetrical diimines synthesized from dimedone?

Label:chem

Topic
The synthesis of diimines from dimedone is significant due to their potential applications as precursors to heterocyclic compounds and their structural diversity.
Answer
Symmetrical and non-symmetrical diimines are synthesized by reacting enaminothiones derived from dimedone with primary amines in chloroform under reflux conditions. The reaction results in the formation of diimines with moderate yields ranging from 38% to 62%, accompanied by the evolution of hydrogen sulfide, indicating the replacement of sulfur with nitrogen at the thione group.
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