N-Heterocyclic Carbenes by Tautomerization of Mesomeric Betaines. Thione, Selenone, and Borane Adduct Formations of Imidazolium-Isocytosinates.

2016 
Basic treatment of imidazolium isocytosinates (III) leads to cross-conjugated heterocyclic mesomeric betaines which are in equilibrium with their corresponding carbenes (IV).
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