Month: November 2022

Umetani, S. published the artcileAdduct formation properties of some polydentate phosphine oxides in the synergistic extraction of metals with 4-acyl-5-pyrazolone derivatives, Synthetic Route of 1691-93-6, the main research area is extraction transition metal pyrazolone adduct; acrylpyrazolone extraction transition metal synergism; phosphoryl compound extraction synergism pyrazolone.

Some bi- and tridentate phosphine oxide compounds were synthesized and liquid-liquid extraction equilibrium of metal ions with 4-acyl-5-pyrazolone derivatives and the neutral phosphine oxide compounds were investigated. Bis(diphenylphosphinyl)methane was found to be a very powerful ligand in the synergistic extraction of rare earths, alk. earths and the divalent metals such as Co(II), Ni(II), Zn(II) and Cd(II). The composition of the extracted species were determined by a graphical method. The adduct formation constants between the acylpyrazolone chelates and the neutral ligands were determined and discussed in terms of the mol. structure.

Process Metallurgy 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, Synthetic Route of 1691-93-6.

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

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

Sinru, Lin published the artcileAscending water electrode studies of metal extractants 4-acyl-5-pyrazolones and selected tervalent lanthanide ions, Formula: C12H9F3N2O2, the main research area is acylpyrazolone polarog ascending water electrode; water ascending stationary electrode acylpyrazolone; pyrazolone acyl polarog dichloroethane water; phenylmethyltrifluoroacetylpyrazolone polarog dichloroethane water; phenylmethylbenzoylpyrazolone polarog dichloroethane water; lanthanide acylpyrazolone polarog ascending water; complex lanthanide acylpyrazolone polarog.

The polarog. and chhronopotentiometric behavior of the chelating extractants 1-phenyl-3-methyl-4-trifluoroacetyl-5-pyrazolone and 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone in the dichloroethane-aqueous systems were characterized at the ascending H2O electrode and the stationary H2O electrode. The nature of the phase transfer processes both in the absence and presence of tervalent lanthanide metal ions was elucidated. Self-adduct and mixed ligand chelate formations were deduced (the latter when trioctylphosphine oxide is present). The reversibility, transfer coefficients, and transfer rate constants of the ligand anions were also deduced. This electrochem. approach is shown to provide novel insights into solvent extraction processes.

Analytical Chemistry published new progress about Electrodes. 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

Earl, Robert A. published the artcileChemical and carbon-13 nuclear magnetic resonance reinvestigation of the N-methyl isomers obtained by direct methylation of 5-amino-3,4-dicyanopyrazole and the synthesis of certain pyrazolo[3,4-d]pyrimidines, SDS of cas: 54385-49-8, the main research area is pyrazole amino dicyano methylation; methylation aminodicyanopyrazole; pyrazolopyrimidine amino methyl.

The structural assignments for the isomeric N-1- and N-2-methyl derivatives of 5-amino-3,4-dicyanopyrazole obtained by direct methylation by C. L. Dickenson et. al (1964) were reinvestigated. The higher melting isomer was annulated to give 4-amino-3-cyano-1-methylpyrazolo[3,4-d]pyrimidine (I, R = CN), which with alkaline peroxide gave I (R = CONH2). Hydrolysis of I (R = CONH2) under more vigorous conditions gave I (R = CO2H), which was decarboxylated in hot sulfolane to give I (R = H). This established the structure of the N-methylpyrazole as 5-amino-3,4-dicyano-1-methylpyrazole and reversed the structural assignment previously reported. A similar reaction sequence converted the lower melting isomer into 4-amino-2-methylpyrazolo[3,4-d]pyrimidine (II) and established the structure as 5-amino-3,4-dicyano-2-methylpyrazole.

Journal of Organic Chemistry published new progress about Methylation. 54385-49-8 belongs to class pyrazoles-derivatives, name is 5-Amino-1H-pyrazole-3,4-dicarbonitrile, and the molecular formula is C5H3N5, SDS of cas: 54385-49-8.

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

Janjic, Monika published the artcileA Simple Synthesis of 5-(2-Aminophenyl)-1H-pyrazoles, COA of Formula: C9H9N3, the main research area is aminophenylpyrazole multistep synthesis; pyrazole multistep aminophenyl synthesis; enamino ketone preparation cyclization hydrazine; nitrophenylpyrazole preparation hydrogenation.

A four-step synthesis of 1-substituted 5-(2-aminophenyl)-1H-pyrazoles as a novel type of histamine analog and versatile building blocks for further transformations was developed. The synthesis starts from com. available 2-nitroacetophenone, which is converted into the enamino ketone (E)-2-O2NC6H4COCH:CHNMe2 (I) as the key intermediate. Cyclization of the key intermediate (I) with monosubstituted hydrazines afforded the 5-(2-nitrophenyl)-1H-pyrazoles. Finally, catalytic hydrogenation of the nitro compounds furnished the title compounds in good yields. As demonstrated by some further transformations, addnl. functionalization of 5-(2-nitrophenyl)-1H-pyrazoles and 5-(2-aminophenyl)-1H-pyrazoles is feasible, either by electrophilic substitution at C(4) of the pyrazole ring, or at the NH2 group.

Helvetica Chimica Acta published new progress about Cyclization. 111562-32-4 belongs to class pyrazoles-derivatives, name is 2-(1H-Pyrazol-3-yl)aniline, and the molecular formula is C9H9N3, COA of Formula: C9H9N3.

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

Hassan, Alaa A. published the artcilePyrazole, pyrazolo[1,2-c]-1,3,4-thiadiazole and thiadiazepine derivatives from thiosemicarbazides, COA of Formula: C5H3N5, the main research area is thiosemicarbazide tetracyanoethene cyclization; pyrazole derivative preparation; pyrazolothiadiazole derivative preparation; thiadiazepine derivative preparation.

Thiosemicarbazides RNHCSNHNH2 [R = Ph, Bn, allyl] reacted with tetracyanoethene in Et acetate with admission of air to form the 7-amino-2-organylimino-2,3-dihydro-1,3,4-thiadiazepine-5,6-dicarbonitriles I [ R = Ph, Bn], 7-amino-1-organylimino-3-oxopyrazolo[1,2-c]-1,3,4-thiadiazole-5,5,6-tricarbonitriles II, 7-amino-1-organyl-iminopyrazolo[1,2-c]-1,3,4-thiadiazole-3,3,5,5,6-pentacarbonitriles III and 3-amino-1H-pyrazole-4,5-dicarbonitrile (IV) in moderate yields. Rationales for the observed conversations are presented.

ARKIVOC (Gainesville, FL, United States) published new progress about Cyclization. 54385-49-8 belongs to class pyrazoles-derivatives, name is 5-Amino-1H-pyrazole-3,4-dicarbonitrile, and the molecular formula is C5H3N5, COA of Formula: C5H3N5.

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