Colasurdo, Diego D. published the artcileTautomerism of uracil and related compounds and mass spectrometry study, SDS of cas: 608-34-4, the publication is European Journal of Mass Spectrometry (2018), 24(2), 214-224, database is CAplus and MEDLINE.
It has been demonstrated that uracil has a preponderant tautomeric form, but it is also known that different tautomers co-exist in this equilibrium In this work, mass spectrometry is used as a helpful tool to analyze the equilibrium, using derivative compounds to forbid the presence of some tautomers and ion trap mass spectrometry to follow relevant fragmentation pathways. Theor. calculations were performed to confirm tautomers abundance by energy minimization in gas phase. Anal. of mass spectra of uracil, three methyl-substituted uracils, 2-thiouracil and three benzouracils suggest that uracil exists mainly as three tautomers in gas phase and one major structure that corresponds to the classical structure of uracil (pyrimidine-2,4(1H,3H)-dione) bearing two carbonyls and two NH moieties, and two minor enolic forms (4-hydroxypyrimidin-2(1H)-one and 2-hydroxypyrimidin-4(1H)-one). Such tautomeric distribution is supported by theor. calculations, which show that they are the three most stable tautomers.
European Journal of Mass Spectrometry published new progress about 608-34-4. 608-34-4 belongs to pyrimidines, auxiliary class Pyrimidine,Amide, name is 3-Methylpyrimidine-2,4(1H,3H)-dione, and the molecular formula is C5H6N2O2, SDS of cas: 608-34-4.
Referemce:
https://pubchem.ncbi.nlm.nih.gov/compound/Pyrimidine,
Pyrimidine – Wikipedia