ChemInform Abstract: Indirect Electrochemical Oxidation of Cyclic Ketones: Influence of Ring Size, Mediator and Supporting Electrolyte on the Result of the Reaction.

The synthesis of novel l-prolinal dithioacetal and its application as an organocatalyst for the direct Michael addition of cyclic ketones and acetophenone derivatives to trans-β-nitrostyrene and related compounds is described. The prolinal dithioacetal acts as effective catalyst in the case of cyclic ketones of different ring size, in particular five- and six-membered examples, as well as larger and smaller ring systems. High enantioselectivity and diastereoselectivity is observed for different substrates and trans-β-nitrostyrenes. Also, the first asymmetric syntheses of selected 2-methyl-4-nitro-1,3-diphenylbutan-1-one derivatives by application of the obtained organocatalyst is presented.

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Influence of Supporting Electrolyte on the Electrochemical Oxidation of Formic Acid on Boron-Doped Diamond Electrodes

Bulletin of the Chemical Society of Japan ◽

10.1246/bcsj.20130008 ◽

2013 ◽

Vol 86 (6) ◽

pp. 749-754 ◽

Cited By ~ 5

Author(s):

Stéphane Fierro ◽

Yuki Honda ◽

Yasuaki Einaga

Keyword(s):

Formic Acid ◽

Electrochemical Oxidation ◽

Supporting Electrolyte ◽

Diamond Electrodes ◽

Boron Doped Diamond ◽

Boron Doped

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Elektrochemische Eigenschaften von Dihydropyridin-und Pyridinderivaten / Electrochemical Properties of Pyridine and Dihydropyridine Derivatives

Zeitschrift für Naturforschung B ◽

10.1515/znb-1981-0322 ◽

1981 ◽

Vol 36 (3) ◽

pp. 386-390 ◽

Cited By ~ 7

Author(s):

G. Abou-Elenien ◽

J. Rieser ◽

N. Ismail ◽

K. Wallenfels

Keyword(s):

Electrochemical Properties ◽

Electrochemical Oxidation ◽

Supporting Electrolyte ◽

Aqueous Solvent ◽

Dihydropyridine Derivatives

AbstractThe electrochemical oxidation and reduction properties of different dihydropyridines and pyridines have been investigated in non aqueous solvent as benzonitrile and aceto-nitrile with tetra-n-butylammonium perchlorate as supporting electrolyte at platinium electrodes using DC-voltametry, cycl. voltametry and coulometry. Possible redox-mechanisms are discussed.

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Electrochemical oxidation of m-cresol purple dye in aqueous media

Water Quality Research Journal ◽

10.2166/wqrjc.2015.036 ◽

2015 ◽

Vol 50 (4) ◽

pp. 305-313

Author(s):

Sajjad Khezrianjoo ◽

Hosakere Doddarevanna Revanasiddappa

Keyword(s):

Electrochemical Oxidation ◽

Applied Voltage ◽

Supporting Electrolyte ◽

Aqueous Media ◽

Degradation Process ◽

Cell System ◽

Electrolysis Cell ◽

System A ◽

Initial Ph ◽

Indicator Dye

The present investigation showed that the indicator dye m-cresol purple (mCP) was degraded in a laboratory scale, undivided electrolysis cell system. A platinum anode was used for generation of chlorine in the dye solution. The influence of supporting electrolyte, applied voltage, pH, initial dye concentration and temperature were studied. The ultraviolet-visible spectra of samples during the electrochemical oxidation showed rapid decolorization of the dye solution. During the electrochemical degradation process, dye concentration and current were measured to evaluate the energy consumption and current efficiency. After 10 minutes of electrolysis, a solution containing 20 mg/L mCP showed complete color removal at a supporting electrolyte concentration of 1 g/L NaCl, initial pH 6.7, temperature 25 °C and applied voltage 5 V; however, when pH was kept at 6.7, a higher rate constant was observed. There was good fit of the data to pseudo-first-order kinetics for dye removal in all experiments. Dependence of the decolorization rate on the initial mCP concentration can be described as roα[mCP]o−0.98. The apparent activation energy for the electrochemical decolorization of mCP was determined to be −6.29 kJ/mol.

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Electrochemical Oxidation of Azo Dye Wastewater Using Graphene-Based Electrode Materials

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2019.16656 ◽

2019 ◽

Vol 19 (11) ◽

pp. 7308-7314

Author(s):

Jinyan Li ◽

Qingsong Guan ◽

Junming Hong ◽

Chang-Tang Chang

Keyword(s):

Electrochemical Oxidation ◽

Current Density ◽

Electrode Materials ◽

Supporting Electrolyte ◽

Performance Comparison ◽

Carbon Cloth ◽

Reactive Black 5 ◽

Dye Wastewater ◽

Composite Electrodes ◽

Initial Concentration

Composite electrodes with different graphene (GN)/TiO2 ratios and nano-activated carbon electrodes were prepared for electrocatalytic performance comparison. The electrodes were loaded with platinum (Pt) by use of chloroplatinic acid to promote their performance. Reactive Black 5 (RBk5) dye wastewater was treated as a challenging pollutant by use of advanced electrochemical oxidation technology. The composite materials were characterized by Transmission Electron Microscope (TEM), Field Emission Scanning Electron Microscopy (FE-SEM), and Energy Disperse Spectroscopy (EDS). Results showed that the graphene electrode was prepared successfully and verified because all elements were uniformly loaded on the conductive carbon cloth. The effects of several operating parameters including material types, pH, initial concentration of RBk5, and current density on the removal performance of RBk5 were also assessed. The supporting electrolyte was NaCl solution of 1 g L−1. The concentration of RBk5 was detected using an ultraviolet spectrophotometer with a detection wavelength of 600 nm. The optimum parameters of the experiment were GN/TiO2 ratio of 1:4 and pH of 6.6. The removal efficiency of RBk5 could be higher than 95% under an initial concentration of RBk5 of 5 ppm and a current density of 2.5 mA·cm-2 when reaction time was 30 min.

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