Category: 1691-93-6

Matsui, Masakazu published the artcile4-Acyl-5-pyrazolones as an analytical reagent. II. Applicability of halogen substituted 4-acyl-5-pyrazolones to the solvent extraction of metals, Formula: C12H9F3N2O2, the main research area is pyrazolone haloacyl extraction agent; europium extraction haloacylpyrazolone; substituent effect extraction haloacylpyrazolone.

Several 4-halogenated acyl derivatives of 1-aryl-3-methyl-5-pyrazolone were synthesized from 1-aryl-3-methyl-5-pyrazolone and the chlorinated acetyl chloride or perfluoroacyl anhydride, and their effectiveness as the solvent extracting agent of metals was evaluated. The placement of the halogen atom into the 4-acetyl group strengthened the acidity of the pyrazolones remarkably. A linear relations was established between the dissociation constant of 1-aryl derivatives and the Hammet σ constant The derivatives had an extremely large extraction constant for Eu chelates, and for example, the pH value at half extraction by 0.02 M of 1-tolyl-3-methyl-4-trifluoroacetyl-5-pyrazolone decreased to 1.1 when n-octanol was used as the extracting solvent.

Bulletin of the Institute for Chemical Research, Kyoto University published new progress about Extraction. 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, Formula: C12H9F3N2O2.

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

Huang, Chunhui published the artcileThe extraction of lanthanides with halogen substituted 4-acylpyrazolones, HPLC of Formula: 1691-93-6, the main research area is lanthanide extraction acylpyrazolone halogen derivative.

Equilibrium extraction behavior for a series of representative tervalent lanthanide ions, La, Pr, Eu, and Yb, using chloroform solutions containing halogenated derivatives of 4-acyl-1-phenyl-3-methyl-5-pyrazolone were studied. These lanthanides are extracted as simple chelates, LnL3. The equilibrium constants of these extraction reactions were calculated The relationships between the acid dissociation constants, Ka, determined by a 2-phase titration method, distribution constants, KDR, and the extraction equilibrium constants, Kex, are discussed.

Solvent Extraction and Ion Exchange published new progress about Extraction. 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, HPLC of Formula: 1691-93-6.

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

Hasany, S. M. published the artcileExtraction of Group VIII elements with 1-phenyl-3-methyl-4-trifluoroacetylpyrazol-5-one, Name: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, the main research area is Group 8 extraction separation; phenylmethylfluoroacetylpyrazolone extraction Group 8; fluoroacetylpyrazolone extraction Group 8; pyrazolone phenylmethylfluoroacetyl extraction Group 8; iron extraction separation; nickel extraction separation; palladium extraction separation; rhodium extraction separation; cobalt extraction separation.

The extraction of Group VIII elements with 1-phenyl-3-methyl-4-trifluoacetyl-pyrazol-5-one from aqueous solutions in CHCl3 was studied as a function of pH. Fe(III), Ni(II), Pd(II), and Rh(III) show partial extraction whereas Co(II) is extracted quant. The effect of citrate, cyanide, fluoride, iodide, thiosulfate and thiourea on the extraction of metal ions was investigated. Back-extraction studies were carried out to strip metal ions from the organic phase into appropriate aqueous solutions Based on these findings some useful anal. separations were proposed and a few of their possible applications are discussed.

Journal of Radioanalytical Chemistry published new progress about Extraction. 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

Hasany, S. M. published the artcileExtraction of group Ib, IIb and III-VA elements with 1-phenyl-3-methyl-4-trifluoroacetyl-pyrazolon-5, Application In Synthesis of 1691-93-6, the main research area is IB extraction pyrazolone masking effect; IIB extraction pyrazolone masking effect; IIA extraction pyrazolone masking effect; IVA extraction pyrazolone masking effect; VA extraction pyrazolone masking effect; pyrazolone extraction Group IB IIB.

The extraction of group IB, IIB and IIIA-VA elements with 1-phenyl-3-methyl-4-trifluoroacetyl-pyrazolone-5 in CHCl3 was studied as a function of pH. The stripping of metal ions into solutions of KCN, HClO4 and appropriate pH buffers was studied. The masking effects of cyanide, citrate, iodide, thiosulfate and thiourea on the extraction were examined Selective group and individual separations are proposed on the basis of pH control, masking effects and back-extraction

Journal of Radioanalytical Chemistry published new progress about Extraction. 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 In Synthesis of 1691-93-6.

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

Sugiura, Masaaki published the artcileEffect of quaternary ammonium salts on carrier-mediated transport of lanthanide ions through cellulose triacetate membranes, Category: pyrazoles-derivatives, the main research area is lanthanide membrane transport quaternary ammonium; acetate cellulose membrane lanthanide transport; lanthanum transport cellulose acetate membrane; cerium transport cellulose acetate membrane; benzoylmethylphenylpyrazolone carrier membrane transport lanthanide; tfluoroacetylmethylphenylpyrazolone carrier membrane transport lanthanide; plasticizer quaternary ammonium salt membrane; nitrophenyloctyl ether plasticizer membrane.

Fluxes of all lanthanides, except Pm, across cellulose triacetate membranes were determined by using mixtures of o-nitrophenyl n-octyl ether and quaternary ammonium salts as plasticizers, and 4-benzoyl-3-methyl-1-phenyl-5-pyrazolone (I) and 4-trifluoroacetyl-3-methyl-1-phenyl-5-pyrazolone (II) as carriers. The quaternary ammonium salts used were didodecyldimethyl-, distearyldimethyl-, tetrahexyl-, tetraoctyl-, and tetradecylammonium bromides [referred to as (C12)2NBr, (C18)2NBr, (C6)4NBr, (C8)4NBr, and (C10)4NBr, resp.]. The effect of these quaternary ammonium bromides on the flux was demonstrated. For membranes containing 0.1 M (C12)2NBr and (C18)2NBr, I exhibited considerably high fluxes. The fluxes of La and Ce using I for (C12)2NBr were higher than those of the other lanthanides. For the membranes containing 0.5 M (C12)2NBr and 0.1 M (C18)2NBr, however, no difference in flux among the lanthanides was observed The fluxes using II for (C12)2NBr and (C18)2NBr were very small, with the exception of some lanthanides. Appreciably high fluxes were observed for membranes containing 0.1 M (C6)4NBr using I. For (C8)4NBr and (C10)4NBr, I exhibited low fluxes. For these membranes using II, the lanthanides were scarcely transported.

Separation Science and Technology published new progress about Plasticizers. 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

Umetani, Shigeo published the artcileRole of the intramolecular hydrogen bond and ligand rigidity in the complexation of trifluoroacetylcycloalkanones with lanthanides: novel strategy for the design of organic ligands of high selectivity, Recommanded Product: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, the main research area is intramol hydrogen bond ligand rigidity complexation; trifluoroacetylcycloalkanone lanthanide complexation extraction.

Trifluoroacetylcyclopentanone (1), -cyclohexanone (2) and -cycloheptanone (3) were synthesized and the complexation with lanthanides (La3+, Pr3+, Eu3+, Ho3+ and Yb3+) was studied via the solvent extraction technique. The strength of the intramol. hydrogen bond depends on the distance between the two donating oxygens in the enol form estimated by semi-empirical MNDO/H and ab initio calculations The O-O distance for 1 is larger than those for 2 and 3 as predicted from their cyclic structures. The strength of the intramol. hydrogen bond increases in the order, 1<2≈3, which is also supported by 1H NMR and IR spectra. The acid dissociation constants (pKa) were measured by potentiometric titration in 30 dioxane-water. The pKa values increase in the order, 1<2≤3, reflecting the strength of the intramol. hydrogen bond. Lanthanides were readily extracted by 1 owing to its strong acidity. However, better separation for lanthanides was achieved with 2 and 3. The extractability and separability were discussed in terms of the ligand rigidity and the intramol. hydrogen bond originating from the distance between the two donating oxygens. Inorganica Chimica Acta published new progress about Complexation. 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

Zhang, Anyun published the artcileAssociation Behavior of 4-Acylpyrazolone Derivative and Tertiary Amine of High Molecular Weight in Antagonistic Synergistic Extraction of Palladium, Computed Properties of 1691-93-6, the main research area is TOA hydrogen bond complexation fluoroacyl pyrazolone derivative spectrophotometry; palladium cation solvent extraction TOA fluoroacyl pyrazolone derivative spectrophotometry.

To find an effective extraction and removal method for palladium(II), which is one of the main fission products from an acidic nuclear spent fuel solution, the extraction behavior of palladium(II) from a nitric acid medium by an acidic chelating extractant, 1-phenyl-3-methyl-4-trifluoroacetylpyrazolone-5-one (HPMTP) and a tertiary amine of high mol. weight, tri-n-octylamine (TOA), has been studied by spectrophotometry. A noticeable antagonistic extraction effect was observed in the extraction system under the given conditions. To understand this phenomenon, a preliminary investigation was performed to explain the mechanism of this reaction. According to the theory of corresponding solutions (TCS), the association reaction between HPMTP and TOA is proposed in the organic phase. An associated species, HPMTP·TOA, formed through hydrogen bonding in a chloroform medium might be the main reason why an antagonistic extraction effect occurred. The association constant between HPMTP and TOA was calculated to be 2.86 ± 0.05.

Journal of Solution Chemistry published new progress about Complexation. 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

Umetani, Shigeo published the artcileThe solvent extraction of divalent metals with 1-phenyl-3-methyl-4-trifluoroacetylpyrazol-5-one and TOPO as the group separation and concentration methods of trace metals, Recommanded Product: 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, the main research area is divalent metal separation water analysis.

The synergistic extraction of divalent metals with 1-phenyl-3-methyl-4-(trifluoroacetyl)pyrazol-5-one (I) [1691-93-6] and trioctylphosphine oxide (II) [78-50-2] was studied for cyclohexane solutions containing 0.02-0.05M I and 0.01M II. Extraction >98% was obtained for Cu, Mn, Zn, Co, Pb, Cd, Fe, and Ni as divalent ions in aqueous solutions buffered to pH 1.5-2.8. The VO2+ extraction was incomplete. At pH 2.4-4 a quant. extraction was obtained for Ca, Mg, Sr, and Ba. The method is suitable for group separation and concentration of trace metals from natural waters, especially for emission spectroscopy.

Bulletin of the Institute for Chemical Research, Kyoto University published new progress about Divalent metals. 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

Marchetti, Fabio published the artcileA new family of ionic dinuclear strontium (imH2)2[Sr2(Q)6] compounds (imH = imidazole; QH = 1-phenyl-3-methyl-4-acylpyrazol-5-one), Safety of 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, the main research area is strontium acylpyrazolonato imidazolium preparation structure; crystal structure strontium pivaloylpyrazolonato methoxyethanol imidazolium.

New neutral [Sr(Q)2(L)n]m or ionic (imH2)2[Sr2(Q)6] air stable complexes (QH = 1-phenyl-3-methyl-4-R(C:O)-pyrazol-5-one; in detail Q = QT for R = CH2CMe3, Q = QP for R = Ph and Q = QF for R = CF3; n = m = 1 for L = tetraglyme (2,5,8,11,14-pentaoxapentadecane); n = m = 2 for L = H2O; n = 2 and m = 1 for moeH (2-methoxyethanol), dmaeH (N,N-dimethylaminoethanol) or phen (1,10-phenanthroline); imH = imidazole) were synthesized and fully characterized. The x-ray crystal structures of [Sr(QT)2(moeH)2]2 and of (imH2)2[Sr2(QT)6] were determined [Sr(QT)2(moeH)2]2 contains an eight-coordinate Sr atom in a square antiprismatic environment, due two bidentate chelating Q donors and two bidentate 2-methoxyethanol ligands. The compound (imH2)2[Sr2(QT)6] is composed of two imidazolium cations and a dianionic fragment [Sr2(QT)6]2-, which is a centrosym. dimer containing four terminal and two bridging Q donor ligands.

Journal of the Chemical Society, Dalton Transactions published new progress about Crystal structure. 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, Safety of 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one.

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