Structures of 1-Phenyl-3-methyl-pyrazolone-5 and its Benzoyl Derivatives+
Open Access
- 1 August 1980
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 35 (8) , 1019-1023
- https://doi.org/10.1515/znb-1980-0817
Abstract
The structures of 1-phenyl-3-methyl-pyrazolone-5 and its benzoyl derivatives have been investigated by means of IR, UV, NMR, and mass spectral spectroscopy. 1-Phenyl - 3-methyl-pyrazolone-5 is found to exist as a zwitter ion in the solid state, in the 5-keto form in chloroform and dioxane, and in the 5-hydroxy form in pyridine. The 4-benzoyl derivative of 1-phenyl-3-methyl-pyrazolone-5 is shown to exist in two different tautomeric enol forms and not an enol form and a keto form as was formerly reported. The structures of two other benzoyl derivatives were investigated and assigned as the C-5-O-benzoyl derivative and C-4-benzoyl-C-5-O-benzoyl derivative, respectively.Keywords
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