298-12-4Relevant articles and documents
Radiation Chemical Studies of Nickel-Glycine. Hydrogen Abstraction by OH Radicals and Oxidation by Br2-1
Bhattacharyya, S.N,Neta, P.
, p. 1527 - 1529 (1981)
Reactions of hydroxyl radicals with Ni(II)-glycine complexes were studied by pulse radiolysis and by product analysis.Radiolytic degradation of the complexes in N2O-saturated solutions leads to the formation of carbonyl compounds.The nature and the yield of these products indicate that the transient formed by reaction of OH with the complex undergoes disproportionation.The optical absorption spectrum of this transient exhibits a maximum below 250 nm, which is similar to that observed with glycine alone.The reaction of Br2- with the complex is found to be too slow to be observed by pulse radiolysis.However, the reaction occurs in steady-state radiolysis and yield products different from those observed with OH.Specifically, the yield of formaldehyde is appreciably higher in the presence of Br-.It is concluded that Br2- oxidizes the metal center of the Ni(II)-glycine complex to Ni(III), whereas OH reacts by hydrogen abstraction to form Ni(II)-coordinated glycine radical.
Combination of Sodium Dodecylsulfate and 2,2′-Bipyridine for Hundred Fold Rate Enhancement of Chromium(VI) Oxidation of Malonic Acid at Room Temperature: A Greener Approach
Malik, Susanta,Mondal, Monohar Hossain,Ghosh, Aniruddha,De, Sourav,Mahali, Kalachand,Bhattacharyya, Shuvendu Sekhar,Saha, Bidyut
, p. 1043 - 1060 (2016)
Chromic acid oxidation of malonic acid in aqueous media has been investigated spectrophotometrically at 303?K. The product glyoxylic acid has been characterized by 13C-NMR and FTIR spectroscopy. Three representative N-heteroaromatic nitrogen base promoters, 2-picolinic acid, 2,2′-bipyridine (bpy) and 1,10-phenanthroline, in combination with the anionic surfactant sodium dodecylsulfate (SDS) enhanced the rate of the oxidation reaction compared to the unpromoted reaction.?2,2′-Bipyridine produced the maximum rate enhancement of the three promoters used. The mechanism of the reaction has been proposed with the help of kinetic results and spectroscopic studies. The observed net enhancement of rate effects has been explained by considering the hydrophobic and electrostatic interaction between the surfactants and reactants. The SDS and bpy combination is suitable for malonic acid oxidation.
An Unusual Oxidative Ring Transformation of Purine to Imidazo[1,5-c] imidazole
Poje, Nevenka,Poje, Mirko
, p. 4265 - 4268 (2003)
(Equation presented) Reevaluation of products derived from 3, 9-dimethyluric acid in a chlorination-reductive dechlorinaton sequence has demonstrated unequivocally that they are not purines. Spectroscopic and degradative evidence, in conjunction with position-labeling NMR studies, revealed an unprecedented oxidative ring transformation pathway involving the key purine-to-imidazo[1,5-c]imidazole rearrangement.
Thomas
, p. 630 (1953)
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Iwo,Noyes
, p. 5422,5423 - 5425 (1975)
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Pathways in Chromic Acid Oxidations. 3. Kinetics and Mechanism of Oxidation of Malonic acid
Senapati, Manorama,Panigrahy, Ganesh P.,Mahapatro, Surendra N.
, p. 3651 - 3655 (1985)
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Eisenbraun,Purves
, p. 622 (1960)
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Saari,Lumma
, p. 349,351 (1978)
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Maxwell,Peterson
, p. 5110 (1957)
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Neuberg,Kobel
, p. 953 (1932)
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Shiono et al.
, p. 3290,3293 (1978)
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Perkin
, p. 90 (1877)
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Oxidation of ethylene glycol and glycolic acid by glycerol oxidase
Isobe
, p. 576 - 581 (1995)
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Preparation method for producing glyoxylic acid through catalytic oxidation of composite solid acid
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Paragraph 0027-0032, (2021/03/18)
The invention provides a preparation method for producing glyoxylic acid through catalytic oxidation of composite solid acid, and belongs to the field of chemical production, and the preparation method for producing glyoxylic acid through catalytic oxidation of composite solid acid comprises the specific steps of raw material preparation, oxidation extraction treatment, oxidation extraction powderpreparation and processing operation, glyoxylic acid processing and filtering treatment and transportation. According to the method, a cocatalyst compound solid acid catalytic oxidation solution is added, so that the yield of glyoxylic acid is increased; the operation environment is improved, the defects of easy environmental pollution and easy equipment corrosion are avoided, the product qualityis stable, and the method is suitable for industrial production; and through multi-layer filtration, the production efficiency of glyoxylic acid can be ensured, the production purity of glyoxylic acid is ensured, the use effect is improved, and the method is simple to store and easy to master.
Electrochemical oxidation of amoxicillin on carbon nanotubes and carbon nanotube supported metal modified electrodes
Ferreira, Marta,Kuzniarska-Biernacka, Iwona,Fonseca, António M.,Neves, Isabel C.,Soares, Olívia S.G.P.,Pereira, Manuel F.R.,Figueiredo, José L.,Parpot, Pier
, p. 322 - 331 (2019/07/10)
The electrolysis of amoxicillin (AMX) was carried out on CNT, Pt/CNT and Ru/CNT modified electrodes based on Carbon Toray in 0.1 M NaOH, 0.1 M NaCl and 0.1 M Na2CO3/NaHCO3 buffer (pH 10) media with the aim of studying the significance of two factors, electrode material and pH, on the oxidative degradation and mineralization of AMX. For this purpose, the electrolysis products were identified by HPLC-MS and GC–MS, and quantified by HPLC-UV-RID and IC. The highest carbon mineralization efficiency, corresponding to 30% of the oxidized AMX, was found for Pt/CNT modified electrode in carbonate buffer medium. Regarding to the AMX conversion, the results show that the effect of pH is higher than that of the electrode material. Principal component analysis allowed to determine the experimental parameters vs. product distribution relationship and to elucidate the oxidation pathways for the studied electrodes. The results show that the hydroxylation of the aromatic ring and the nitrogen atom play an important role on the efficient degradation of AMX.