Royal Society of Chemistry, Journal of the Chemical Society, Chemical Communications, 9, p. 1143-1145, 1994
DOI: 10.1039/c39940001143
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The first example of desmotropy in azoles has been found concerning 3-methyl-4-nitropyrazole and its tautomer, 5-methyl-4-nitropyrazole: the crystal and molecular stucture of both tautomers has been determined by X-ray analysis, 13C CPMAS NMR spectroscopy has been used for studying the isomerization processes in the solid state.