1-Phenyl-3-methyl-4-benzoylpyrazol-5-one as a group-extraction reagent for spectrophotometric determination of trace elements

Mirza, Μ. Y.; Nwabue, F. Ik.

doi:10.1016/0039-9140(81)80137-3

Cited by 37 publications

(2 citation statements)

References 4 publications

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“…It is known that ß-diketones like acetylacetone, dibenzoylmethane, thenoyltrifluoroacetone, 4-acyl-5-pyrazolones or 4-acyl-5-isoxazolones are chelating ligands with a wide use in the solvent extraction of transition metal, actinides, lanthanides and others ions [1][2][3][4][5][6][7][8][9][10][11]; analogous compounds containing sulfure like monothiodibenzoylmethane and dithiocarboxylate derivatives also have been employed [12,13]. We have reported several studies on this matter, concerning to synthetic methods, chelating and extractive properties of pyrazolyl-4alkyldithiocarboxylate derivatives synthesized from 5-pyrazolones [14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

1-Alkyl-4-Ethoxythiocarbonyl-5-Hydroxy-3- Methylpyrazole : Synthesis , Copper Complexes and Solvent Extraction Studies

Oliva¹,

Molinari²,

Toro³

2008

Heterocyclic Communications

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1 -Alkyl-4-ethoxythiocarbonyl-5-hydroxy-3-methylpyrazole, HETCP, (alkyl = n-octyl ; n-dodecyl) were prepared in high yield by the reaction of l-alkyl-3methyl-2-pyrazolin-5-one with bis (ethoxythiocarbonyl)sulfide and sodium acetate in dimethylformamide. These reagents act as O, S bidentate ligands in solvent extraction/reextraction studies of Cu (II) from acid aqueous solutions and the extracted specie resulted to be Cu(ETCP)2. ExperimentalAll reagents used in the synthetic procedures as well as in the solvent extraction studies were of analytical grade Elemental, analysis of carbon, hydrogen, nitrogen and sulfur were obtained with a Perkin Elmer 2400 Serie II Analyser. IR spectra were recorded on a Perkin Elmer Spectrum One FT-IR spectrophotometer, using KBr discs. NMR spectra of ligands were recorded in the Centra de Resonancia Magnetica Nuclear V Region, located at the Universidad Tecnica Federico Santa Maria, on a Avance 400 Digital NMR Bruker spectrometer at 400.132 MHz for 'H and 100.623 MHz for ,3 C in deuterochloroform with internal TMS as reference. UV-VIS spectra were recorded on a Perkin Elmer UV/VIS Lambda EZ 201 spectrophotometer, with chloroform as solvent. Melting points were measured in a Kofler Bristol apparatus and are uncorrected. Individual stock solutions 0.01 Μ in Cu(II) and 0.1 Μ in potassium nitrate at fixed pH, were prepared from cupric nitrate and standardized by iodometric titration with Na 2 S 2 0 3 0.01 M. The pH of these Cu (II) solutions was adjusted in the range 1-5 by the addition of hydrochloric acid solutions of variable concentration. Acetic acid-sodium acetate buffer was used in the extraction studies as a function of the ligand concentration at constant pH. Freshly distilled chloroform and Escaid 103 were used as solvent and all extraction experiments were achieved by the batch method with a variable-speed vortex mixer (Orbital Shaker).

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Section: Introductionmentioning

confidence: 99%

1-Alkyl-4-Ethoxythiocarbonyl-5-Hydroxy-3- Methylpyrazole : Synthesis , Copper Complexes and Solvent Extraction Studies

Oliva¹,

Molinari²,

Toro³

2008

Heterocyclic Communications

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“…l-(2-Lepidylazo)-2-acenaphthylenol formed colored complexes with six transition metals which were extractable into chloroform (508). l-Phenyl-3-methyl-4benzoylpyrazol-5-one has been suggested as a group extractant for certain transition metals prior to their spectrophotometric determination (328). Rare earth metals can be determined as their highly colored, mixed-ligand complexes with 4-(2pyridylazo)resorcinol and antipyrine, formed at pH 6.5 and extracted into nitrobenzene (354).…”

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confidence: 99%

Ultraviolet and light absorption spectrometry

Howell¹,

Hargis²

1982

Anal. Chem.

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4‐Alkoxycarbonyl, 4‐alkylthiocarbonyl and 5‐alkoxycarbonyloxy derivatives of 1‐substituted‐3‐methylpyrazol‐5‐ones

López

Leon

Oliva

1995

Journal of Heterocyclic Chem

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The reaction of 1‐substituted‐3‐methylpyrazol‐5‐ones 1 with alkyl chloroformates and calcium hydroxide in dioxane have been studied. With 1‐phenyl‐3‐methylpyrazol‐5‐one, the isolated product was alkyl 3‐methyl‐5‐oxo‐1‐phenylpyrazole‐4‐carboxylate 2 but with 1‐alkyl‐3‐methylpyrazol‐5‐one formation of 1‐alkyl‐5‐alkoxycarbonyloxy‐3‐methylpyrazole 3 was observed. Replacement of alkyl chloroformate by bis(alkoxythiocarbonyl) sulfide results in the formation of 4‐alkoxythiocarbonyl derivatives 4 in low yield with both 1‐substituted‐3‐methylpyrazol‐5‐ones.

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1-Phenyl-3-methyl-4-benzoylpyrazol-5-one as a group-extraction reagent for spectrophotometric determination of trace elements

Cited by 37 publications

References 4 publications

1-Alkyl-4-Ethoxythiocarbonyl-5-Hydroxy-3- Methylpyrazole : Synthesis , Copper Complexes and Solvent Extraction Studies

1-Alkyl-4-Ethoxythiocarbonyl-5-Hydroxy-3- Methylpyrazole : Synthesis , Copper Complexes and Solvent Extraction Studies

Ultraviolet and light absorption spectrometry

4‐Alkoxycarbonyl, 4‐alkylthiocarbonyl and 5‐alkoxycarbonyloxy derivatives of 1‐substituted‐3‐methylpyrazol‐5‐ones

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