Abstract
The IR, UV, and NMR spectra and p K values are discussed of six potentially tautomeric 1-phenyl and 1-methyl-pyrazolin-5-ones. These compounds exist under most conditions in non polar media in the Δ 3-form. In aqueous solution that NH-formis in equilibrium with ca.10% of the OH-form. The effect of substituents, and the relation of the results to those for the corresponding isoxazolin-5-ones is discussed. Previous work is reviewed.
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