Ladjarafi, Abdelkader published the artcileA DFT study of the tautomeric equilibria of substituted pyridone-like derivatives: Sulphur versus oxygen and imino effect, Formula: C6H8N2, the publication is Journal of Molecular Structure: THEOCHEM (2004), 709(1-3), 129-134, database is CAplus.
Several pyridone-like compounds, where the extracyclic oxygen atom has been replaced by a sulfur atom or an imino NH group, have been studied using B3LYP/6-311 + G** calculations We found that the NH substituted species differ from the other ones: a single tautomeric form, i.e. the aminopyridine one, strongly dominates either in the gas phase or in the presence of a polar solvent like DMSO. In the gas phase or in solution, pyridinethiol species are more favored than the pyridinol ones relatively to their corresponding tautomers. The zero point vibration energy and the entropic contribution to the free energy of the reaction play a more determining role for the sulfur containing species.
Journal of Molecular Structure: THEOCHEM published new progress about 18437-58-6. 18437-58-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 4-Amino-2-picoline, and the molecular formula is C6H8N2, Formula: C6H8N2.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem