Abstract
Treatment of mono- and diisocyanates with 3-methyl-4-alkyl(aryl)pyrazol-5-ones by heating in absolute dioxane gives the corresponding 1-carbamoylpyrazol-5-ones. Using PMR spectroscopy it has been shown that they exist in the 5-hydroxypyrazole form in DMSO, dimethylacetamide, chloroform, or acetone solutions.
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Literature Cited
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1058–1060, August, 1990.
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Vostokov, I.A., Vasyaeva, L.V., Maricheva, G.A. et al. Reaction of isocyanates with pyrazol-5-ones. Chem Heterocycl Compd 26, 884–886 (1990). https://doi.org/10.1007/BF00480862
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DOI: https://doi.org/10.1007/BF00480862