A 1H and 13C-NMR spectral study of some 4-acyl-3-methyl-1-phenylpyrazol-5-ones in chloroform

Synthesis, Characterization, and Biological Activity ofN′-[(Z)-(3-Methyl-5-oxo-1-phenyl-1,5-dihydro-4H-pyrazol-4-ylidene)(phenyl)methyl]benzohydrazide and Its Co(II), Ni(II), and Cu(II) Complexes

“…The assignments are as follows: C-1 = 127.55, C-2 = 127.42, C-3 = 129.70, C-4 = 127.42, C-5 = 127.55, C-6 = 131.43, C-7 = 138.75, C-8 = 163.64, C-9 = 130.69, C-10 = 148.27, C-11 = 132.78, C-12 = 130.04, C-13 = 128.83, C-14 = 130.04, C-15 = 15.44, C-16 = 149.28, C-17 = 120.34, C-18 = 154.55, C-19 = 138.22, C-20 = 119.85, C-21 = 129.70, C-22 = 125.26, C-23 = 129.70 and C-24 = 119.85 ppm (see ( 4 ) in Figure 1). All assignments were consistent with literature on related studies [44–48]. …”

Synthesis and tautomeric studies of enamines from 1-(n-Hexyl)-3-methyl-2-pyrazolin-5-one

“…Consequently, in CDCl 3 solution at 28 ºC, 4-acyl-(1-nhexyl)-3-methyl-5-pyrazolones (3a-d) exist mainly as 4acylpyrazol-5-ols with intramolecular hydrogen bond (A'), in agreement with other reports. 30,31,39,40 Additionally, 1 H and 13 C NMR spectra in acetone-d 6 and DMSO-d 6 were obtained for compounds 3a and 3c, observing same pattern as with chloroform solutions.…”

Extraction of Fe(III) and U(VI) with 1-Phenyl-3-methyl-4-acyl-pyrazolones-5 from Aqueous Solutions of Different Acids and Complexing Agents. Separation of Fe(III) from U(VI)

“…Some workers have however, used the 4-acetyl [1], 4-capryl [4], 4-butyryl [5], 4-trifluoroacetyl [6,7] and 4-caproyl [8] for similar studies and have reported effective extraction of metal ions from solutions at low pH. Consequently, efforts have been put recently towards extending the range of extraction reagents beyond HBP to other 4-acyl derivatives of pyrazolone, which included those we have fully characterized [9] for use in extraction studies.…”