Tag: M.W=250-300

Mundra, S. K. published the artcileSynergistic extraction of uranyl ion with acylpyrazolones and dicyclohexano-18-crown-6, Application of 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, the main research area is uranyl extraction acylpyrazolone crown synergism.

Synergistic extraction of UO22+ ion with acylpyrazolones such as 1-phenyl-3-methyl-4-trifluoroacetylpyrazolone-5 (HPMTFP, pKa = 2.7), 1-phenyl-3-methyl-4-acetylpyrazolone-5 (HPMAP, pKa = 3.8), or 1-phenyl-3-methyl-4-benzoylpyrazolone-5 (HPMBP, pKa = 4.2) in combination with dicyclohexano-18-crown-6 (DC-18-C6) was studied at various temperatures The results indicate that the equilibrium constants of the organic phase addition reaction, log Ks, at 30° are almost constant (2.72, 2.69, 2.84, resp., for the above 3 systems). The similarity and low log Ks values with DC-18-C6 as compared with TBP systems with these pyrazolones appears to arise due to the limitation to the approach of the large crown ether mol. in bonding with the uranyl chelate. This is in contrast to the fact that the relative basicities of the 2 donors (equilibrium constant for HNO3 uptake) are comparable. Thermodn. data for chelate extraction with HPMTFP evaluated by the temperature coefficient method indicates that a hydrated chelate is extracted into the organic phase. Also, the organic phase addition reaction with DC-18-C6 is stabilized by exothermic enthalpy change, the entropy change counteracting in all the 3 cases.

Journal of Radioanalytical and Nuclear Chemistry published new progress about uranyl extraction acylpyrazolone crown synergism. 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, Application of 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Uzoukwu, B. A. published the artcile1-Phenyl-3-methyl-4-trifluoroacetyl-5-pyrazolone (HPMTFP) as an extraction and spectrophotometric reagent for vanadium (V), Recommanded Product: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, the main research area is vanadium determination extraction spectrophotometry; phenylmethyltrifluoroacetylpyrazolone reagent vanadium determination.

A rapid and efficient method for the determination of a large quantity of V(V) in an aqueous medium using HPMTFP is described. The percentage extraction as a function of pH of aqueous medium is reported and quant. extraction of V(V) occurs in the pH range of 1.7-2.3. The properties of the color of the extracted complex species with respect to pH of solution, various solvents, time and presence of diverse ions are reported. Beer’s law is valid up to 100 ppm of V (V) (ε = 1.1 × 102 L mol-1 cm-1).

Journal of the National Science Council of Sri Lanka published new progress about vanadium determination extraction spectrophotometry; phenylmethyltrifluoroacetylpyrazolone reagent vanadium determination. 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, Recommanded Product: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Jensen, Bror Skytte published the artcileSolvent extraction of metal chelates. II. 1-Phenyl-3-methyl-4-acyl-5-pyrazolones, Synthetic Route of 1691-93-6, the main research area is .

cf. ibid. 1668; CA 56, 6718d. A comparison of the apparent mean complexity constants of various 1-phenyl-3-methyl-4-acyl-5-pyrazolones with Be++, Mn++, Zn++, Pb++, UO2++, La+++, and Th4+ in a CHCl3-H2O system shows a linear relation between the log of the distribution coefficient of an uncharged metal chelate and the log of the distribution coefficient of the un dissociated chelating agent, the slope of the line being characteristic of the metal ion. As expected, an increase of the aliphatic side-chain increases the lipophilic character of the chelating agent, and hence increases its distribution coefficient between organic phase and H2O. In the titration experiments, the chelating agents and the metal salts were 0.05 and 0.005M, resp.; when the media become alk. the metals forming slightly soluble hydroxides often precipitate out. Although some acetyl pyrazolones are inferior to, and others superior to, thenoyltrifluoroacetone (I), the caproylpyrazolone offers better separation than I for the above metal ions. As the capacity of the systems involved are rather large, and the separation adequate for many purposes, these compounds show promise as extractive chelating agents for anal. and radiochem. work.

Acta Chemica Scandinavica published new progress in CAplus about 1691-93-6, 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, Synthetic Route of 1691-93-6.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Jensen, Bror Skytte published the artcileSynthesis of 1-phenyl-3-methyl-4-acyl-5-pyrazolones, Name: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, the main research area is .

cf. CA 56, 6718d. Condensations of acid chlorides and anhydrides with 1-phenyl-3-methyl-5-pyrazolone in dioxane, catalyzed by suspended Ca(OH)2, give directly and in good yield the following 4-acyl-l-phenyl-3-methyl-5-pyrazolone analogs, which are promising chelating agents for the extraction of metal ions (acyl group, m.p., and % yield given): Ac, 58° (MeOH-H2O), 56; EtCO, 62° (MeOH-H2O), 50; ClCH2CO, 88° (MeOH-H2O) (enol m. 140°), 73; PrCO, 80° (MeOH-H2O), 57; EtOCO, 122° (MeOH-H2O) (enol m. 72°), 46; p-BrC6H4CO, 167° (dioxane-H2O) (enol m. 122°), 82; p-O2NC6H4CO, 200° (dioxane-H20), 79; and F3CCO, 144° (EtOH-H2O) (enol m. 132°), 78. Also prepared is 50% 1-(p-nitrophenyl)-3-methyl-4-benzoyl-5-pyrazolone, m. 174° (keto), 224° (enol) (dioxane-H2O). The method fails to give a product capable of metal extraction with pivalyl chloride. The acid strength of the 4-acylpyrazolones is of the same magnitude as that of carboxylic acids (pK 3-5). Their mol. weights are determined by titration in H2O-alc. with phenolphthalein indicator.

Acta Chemica Scandinavica published new progress in CAplus about 1691-93-6, 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, Name: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Uzoukwu, Bieluonwu Augustus published the artcileSyntheses, structure, UV-visible and IR spectral studies of 1-phenyl-3-methyl-4-acyl-5-pyrazolone complexes with vanadium(V), Recommanded Product: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, the main research area is vanadium oxo acylpyrazolone complex; pyrazolone acyl vanadium oxo complex.

VO2A.HA (HA = 1-phenyl-3-methyl-4-acyl-5-pyrazolone (acyl = acetyl, propionyl, butyryl, valeroyl, caproyl, benzoyl, trifluoroacetyl, trichloroacetyl) were prepared Characterization was by elemental analyses, UV-visible and IR spectral studies. The UV-visible and IR spectral data with the approx. assignments are given and discussed.

Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry published new progress about IR spectra. 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, Recommanded Product: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Cecchini, Martina Maya published the artcileMild catalytic oxidations of unsaturated fatty acid methyl esters (FAMEs) by oxovanadium complexes, Category: pyrazoles-derivatives, the main research area is catalytic oxidation unsaturated fatty acid methyl ester oxovanadium complex.

A selection of unsaturated fatty acid Me esters, namely Me oleate (C18:1), Me linoleate (C18:2) and Me linolenate (C18:3) has been oxidized under mild homogeneous catalytic conditions, using a series of oxovanadium(IV) complexes containing 4-acyl-5-pyrazolone donor ligands with different substituents on acyl residue. The main goal was to evaluate the catalytic role exerted by oxovanadium(IV) metal center, as precursor complex, in the selective oxyfunctionalization of carbon-carbon double bonds of these bio-renewable resources, as a greener alternative to more drastic processes currently used at the industrial level. The three substrates, oxidized using tert-butylhydroperoxide as main oxidant, with or without solvents, showed high conversions of starting materials and high selectivities in the formation of corresponding mono- di- and tri-epoxides, especially under solvent-less conditions. Investigations on a probable catalytic cycle mechanism operative in the tert-butylhydroperoxide oxidation of a simple FAME model substrate, have been performed by means of ESI-MS.

Applied Catalysis, A: General published new progress about Oxidation. 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, Category: pyrazoles-derivatives.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Hasany, S. M. published the artcileExtraction and separation of mercury from toxic elements arsenic, cadmium, antimony and thallium, and other metal ions, Computed Properties of 1691-93-6, the main research area is mercury extraction toxic element; arsenic mercury separation; cadmium mercury separation; antimony mercury separation; thallium mercury separation.

Extraction of Hg with 3-methyl-1-phenyl-4-trifluoroacetylpyrazolin-5-one in CHCl3 is described. Maximum extraction (97.3%) and a distribution coefficient (D) of 36.5 are achieved at pH 8. Among the anions tested, thiourea, thiosulfate, and cyanide mask the extraction of Hg. A solution of 0.2M KCN was the most suitable stripping agent for Hg. Decontamination data show that Hg can be separated from toxic elements As, Cd, Sb, and Tl and from other metal ions, i.e., Ga, In, Ge, Sn, Fe Ir, and Pt. A few separations of anal. and radiochem. importance are discussed.

Journal of Radioanalytical and Nuclear Chemistry published new progress about Toxicants. 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, Computed Properties of 1691-93-6.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Mundra, S. K. published the artcileSynergistic extraction of uranyl ion with acylpyrazolones and some oxo donors, Recommanded Product: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, the main research area is uranyl extraction acylpyrazolone oxo donor; thermodn extraction uranyl acylpyrazolone oxo donor.

Synergistic extraction of uranyl ion with acyl pyrazolones such as 1-phenyl-3-methyl-4-trifluoroacetyl-pyrazolone-5 (HPMTFP, pKa = 2.7), 1-phenyl-3-methyl-4-acetyl-pyrazolone-5 (HPMAP, pKa = 3.8) in combination with oxo-donors of widely varying basicities, [diphenyl sulfoxide(DPSO), TBP, or TOPO] was studied at various fixed temperatures The results indicate that the equilibrium constants of the organic phase addition reaction (Ks) with these donors follow the order of their basicities (Kh) viz DPSO(0.033) < TBP(0.16) ≪ TOPO(8.9) with their corresponding log Ks values for 3.40, 3.88, 8.05 for HPMTFP system and 3.52, 4.22, 8.04 for HPMAP system. The thermodn. parameters associated with the organic phase addition reaction with these systems were evaluated by the temperature coefficient method. The organic phase addition reaction with TOPO is stabilized both by entropy as well as enthalpy change in both the cases. The high neg. values of enthalpy and low values of entropy for the TBP system may be explained by the addition and not the substitution reaction for the water mols. in the metal chelate. Lanthanide and Actinide Research published new progress about Basicity. 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, Recommanded Product: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Saeed, M. Mufazzal published the artcileSynergic extraction of Eu(III) with 3-methyl-1-phenyl-4-trifluoroacetyl-2-pyrazolin-5-one (HPMTFP) and tribenzylamine (TBA) from perchlorate media, Recommanded Product: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, the main research area is extraction europium fluoroacetylpyrazolinone benzylamine aqueous perchlorate; formation constant europium complex synergic extraction; partition europium extraction fluoroacetylpyrazolinone benzylamine.

Synergic extraction of hydrolyzable lanthanide Eu(III) was studied at low pH range with 0.05 M (HPMTFP + TBA) in CHCl3 from aqueous perchlorate media. The composition of the adduct was established as Eu(PMTFP)3·TBA and Eu(PMTFP)3·2TBA under the conditions of 0.01 M ≥ TBA. The formation constants Ka, Ksyn1, and Ksyn2 and stability constants β1, β2, and K2 of the organic phase reaction were calculated Among the various anions and cations tested, fluoride, oxalate, phosphate, EDTA, Cu(II), and Ti(IV) have drastically reduced the extraction of Eu, whereas oxalate partially reduces the extraction

Radiochimica Acta published new progress about Anions. 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, Recommanded Product: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Shukla, J. P. published the artcileProtolytic equilibria of several 4-acyl-substituted 1-phenyl-3-methylpyrazol-5-ones in dioxane-water mixtures, Category: pyrazoles-derivatives, the main research area is ionization constant pyrazolone acyl derivative; solvent effect ionization acylpyrazolone; thermodn ionization acylpyrazolone; substituent effect ionization acylpyrazole.

Thermodn. proton ionization constants, pKa, of several 4-acyl-substituted pyrazol-5-ones I [R = CF3, Me, (CH2)4Me] were determined in various dioxane-water mixtures at 25 and 35 ± 0.1°. The pKa values were determined by glass-electrode potentiometry and refined by computer. Both extrapolation and least-squares methods were used to obtain pKa values in pure water. All three acyl derivatives are weak monoprotic acids with pKa values between 2.5 and 3.9, increasing in the order stated. The pKa values do not vary linearly with the reciprocal of the dielec. constant of the medium; however, a plot of pKa vs. the mole fraction of dioxane is linear at a given temperature Values of standard free energy, enthalpy, and entropy changes associated with their protolytic equilibrium were also calculated Temperature, medium and substituent effects are briefly discussed.

Journal of Physical Organic Chemistry published new progress about Enolization. 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, Category: pyrazoles-derivatives.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics