SYNTHESIS, POTENTIOMETRIC TITRATIONS, AND SPECTRA OF PYRAZOLONES

Abstract

Monosubstituted benzoylacetic esters, obtained by condensation of n-alkyl halides with ethyl benzoylacetate, were reacted with hydrazine and phenylhydrazine to give 3-phenyl and 1,3-diphenyl 5-pyrazolones monosubstituted in position 4 by alkyl radicals R (R = H, CnH2n+1(n-1 to 10), and C6H5CH2.). The dissociation constants of the pyrazolones were determined by potentiometric titrations. A study was made of the ultraviolet absorption spectra in both neutral and acid medium and of the infrared absorption spectra. X-ray powder diffraction patterns and data of the pyrazolones were obtained.