ChemInform Abstract: Anodic Oxidation Products of 2′,5′-Dimethoxyacetanilide Derivatives, and Their Application to the Synthesis of Aminoanthraquinones.

ChemInform ◽  
2010 ◽  
Vol 23 (11) ◽  
pp. no-no
Author(s):  
R. A. RUSSELL ◽  
R. W. LONGMORE ◽  
R. N. WARRENER
Keyword(s):  
Anodic Oxidation ◽  
Oxidation Products

Characterization of the corrosion or anodic oxidation products on zinc

1975 ◽  
Vol 3 (2) ◽  
pp. 129-138 ◽  
Author(s):  
G. Trabanelli ◽  
F. Zucchi ◽  
G. Brunoro ◽  
G. Gilli
Keyword(s):  
Anodic Oxidation ◽  
Oxidation Products

Electrochemical Oxidation of o-Amiophenol in the Presence of NaCI for Wastewater Treatment

2014 ◽  
Vol 900 ◽  
pp. 382-385
Author(s):  
Chun Hong Nie ◽  
Bao Hui Wang
Keyword(s):  
Wastewater Treatment ◽  
Electrochemical Oxidation ◽  
Anodic Oxidation ◽  
Experimental Results ◽  
Oxidation Products ◽  
Chlorinated Compounds ◽  
Oxidation Analysis

The electrochemical oxidation of o-Aminophenol in the presence o f NaCl for wastewater treatment was studied on Ti/IrO2-Ta2O5 , Ti/IrO2-Ta2O5-SnO2 and Ti/IrO2 anodes. The experimental results have shown that the presence of NaCl catalyses the anodic oxidation of o-Aminophenol due to the participation of electrogenerated ClO- in the oxidation. Analysis of the oxidation products has shown that initially organo chlorinated compounds are formed in the electrolyte.

Figuring and Finishing of Reaction-Sintered SiC by Anodic Oxidation Assisted Process

2014 ◽  
Vol 625 ◽  
pp. 570-575 ◽  
Author(s):  
Naoki Shimozono ◽  
Xin Min Shen ◽  
Hui Deng ◽  
Katsuyoshi Endo ◽  
Kazuya Yamamura
Keyword(s):  
Anodic Oxidation ◽  
Oxidation Rate ◽  
Uv Light ◽  
High Hardness ◽  
Oxidation Products ◽  
Ultrapure Water ◽  
Machine Material ◽  
Optical Components ◽  
Glass Lens ◽  
Polishing Tool

Reaction-sintered silicon carbide (RS-SiC) is a promising material for optical components used in space, or molds for precision glass lens because of its excellent properties. For processing of RS-SiC, diamond tools are utilized because RS-SiC is difficult-to-machine material due to its high hardness. In that case, subsurface damage (SSD) and scratches are inevitably introduced on the processed surface, and they deteriorate the qualities of products. To resolve these issues, we proposed a complex machining technique named anodic oxidation assisted process (AOAP), in which localized anodic oxidation and removal of the oxidation layer by grinding or polishing were combined, for figuring or polishing of RS-SiC without introducing any scratches and SSD. The grinding or polishing tool used in AOAP has a lower hardness than that of RS-SiC, but higher than that of the oxidation products. It is possible to figure the objective shape and polish the surface by changing the conditions including the oxidation time, the composition of electrolyte, the configuration of the cathode electrode, applied voltage, and so on. In our previous study, we found that RS-SiC was oxidized efficiently by anodic oxidation with various electrolytes such as phosphoric acid, ultrapure water, and a mixture of hydrochloric acid and hydrogen peroxide. In this research, we investigated the preliminary processing characteristics of AOAP for RS-SiC. We ascertained that irradiating UV light with photon energy higher than the band gap of processed materials is very effective for increasing the oxidation rate of anodic oxidation. And we proposed a novel polishing process of RS-SiC, which combining oxidation only SiC area in RS-SiC by anodic oxidation with the electrolyte of ceria slurry, with polishing by ceria slurry which removes both oxidized layer and unoxidized layer in RS-SiC. The results of investigation for the oxidation rate and the polishing rate of SiC, Si and SiO2 with ceria slurry implies that we can remove SiC grain and Si grain in RS-SiC at the same MRR by combing the anodic oxidation and polishing with ceria slurry at the same time, and obtain the smooth surface.

Formation and Characterization of Dispersed Mixed Iron-titanium Oxide Systems by Electrochemical Method

2020 ◽  
Vol 10 (1) ◽  
pp. 25-36
Author(s):  
Alexander F. Dresvyannikov ◽  
Irina O. Grigoryeva ◽  
Leniza R. Salemgaraeva
Keyword(s):  
Anodic Oxidation ◽  
Electrochemical Method ◽  
Structural Characteristics ◽  
Electrical Contact ◽  
Aqueous Media ◽  
Electrochemical Process ◽  
Oxide System ◽  
Oxidation Products ◽  
Anode Current Density ◽  
Oxide Systems

Aims: Anodic polarization behavior of a combined iron-titanium electrode (two metals in electrical contact with each other) in aqueous solutions containing halide ions (F- and Cl-) was studied. Methods: he joint anodic dissolution of titanium and iron with subsequent thermal treatment makes it possible to obtain precursors of a highly dispersed mixed oxide system Fe2O3-TiO2. The phase and elemental composition and structural characteristics of obtained products were examined using X-ray diffraction and scanning electron microscopy. It has been experimentally confirmed that via changing the anode current density, hydrofluoric acid concentration in electrolyte and ratio of the working surface area of contacting metals, it is possible to effectively control the rate of anodic reactions and phase composition and morphology of anodic oxidation products for iron and titanium components in a combined electrode. Results: The main results of this study are as follows: Electrochemical method for the synthesis of complex dispersed oxide system Fe2O3-TiO2 based on joint anodic oxidation of contacting metals in aqueous media was suggested. Relationships between parameters of the electrochemical process and characteristics of the synthesized oxide system were revealed. Conclusion: By varying the parameters of the electrolysis process, it is possible to prepare complex oxyhydroxides with different ratios of iron and titanium, which makes it possible to synthesize precursors of iron titanates of preset composition and structure.

scholarly journals An Insight into the Reactivity of the Electrogenerated Radical Cation of Caffeine

Electrochem ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 44-55
Author(s):  
Marta Feroci ◽  
Martina Bortolami ◽  
Isabella Chiarotto ◽  
Paola Di Matteo ◽  
Leonardo Mattiello ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Radical Cation ◽  
Anodic Oxidation ◽  
Degradation Products ◽  
Oxidation Products ◽  
Coupling Reactions ◽  
Pt Electrode ◽  
Controlled Potential ◽  
Chromatographic Peaks ◽  
Insight Into

Controlled potential electrolyses of caffeine (CAF) were carried out at a Pt electrode in undried acetonitrile (ACN) and ACN-H2O and the products of the anodic oxidation were analyzed by HPLC-PDA-ESI-MS/MS. A higher current efficiency occurred in ACN-H2O, but an analogous chromatographic outline was found in both media, evidencing a reactive pathway of the electrogenerated radical cation CAF•+ with water, added or in trace, as nucleophile. No dimeric forms were evidenced, excluding any coupling reactions. Neither was 1,3,7-trimethyluric acid found, reported in the literature as the main oxidative route for CAF in water. Four main chromatographic peaks were evidenced, assigned to four proposed structures on the base of chromatographic and spectral data: a 4,5-diol derivative and an oxazolidin-2-one derivative were assigned as principal oxidation products, supporting a mechanism proposed in a previous work for the primary anodic oxidation of the methylxanthines olefinic C4 = C5 bond. Two highly polar degradation products were also tentatively assigned, that seemed generating along two different pathways, one opening the imidazolic moiety and another one opening the purinic one.

scholarly journals Auto-inhibition effects in anodic oxidation of phenols for electrochemical waste-water purification

2001 ◽  
Vol 66 (11-12) ◽  
pp. 765-784 ◽  
Author(s):  
H. Al-Maznai ◽  
B.E. Conway
Keyword(s):  
Waste Water ◽  
Anodic Oxidation ◽  
Environmental Science ◽  
Oxidation Products ◽  
Waste Waters ◽  
Electrode Surfaces ◽  
Organic Impurities ◽  
High Area ◽  
Oxidation Of Phenols ◽  
Related Compounds

Removal or modification of noxious organic impurities in waste-waters is a major challenge for environmental science. Pollutants such as phenols and their derivatives, as well as PCBs, have attracted special attention. In recent years, the possibilities of effecting direct electrocatalytic oxidations at high-area electrodes such as supported Pt or RuO2 have been investigated. However, in a number of cases, especially with phenolic impurities, application of anodic oxidation fails to lead to continuous Faradaic oxidation currents owing to the electrode surfaces becoming blocked with polymeric oxidation products leading to auto-inhibition (?passivation?) of the desired electrode process. Examples of such effects with phenols and related compounds are examined comparatively in the present paper by means of cyclic volatammetry and chronoamperometry.

Anodic-Oxidation Products of 2',5'-Dimethoxyacetanilide Derivatives, and Their Application to the Synthesis of Aminoanthraquinones

1991 ◽  
Vol 44 (12) ◽  
pp. 1691 ◽  
Author(s):  
RA Russell ◽  
RW Longmore ◽  
RN Warrener
Keyword(s):  
Anodic Oxidation ◽  
Oxidation Products ◽  
Hydrolysis Products ◽  
Derivatives Of

Anodic oxidation of simple 2′,5′-dimethoxyacetanilides proceeds under mildly basic conditions to afford either monomeric or dimeric quinone bisacetals, depending on the structure of the substrate. Similarly, the oxidation of linked derivatives of 2′,5′-dimethoxyacetanilides is shown to exhibit a comparable sensitivity, with non-alkylated amides being efficiently converted into bis(quinone bisacetals). The regiospecificity of acetal hydrolysis for both simple and linked quinone bisacetals is shown to be dependent upon the nature of the N-acyl group. The annelation of these hydrolysis products with the anion of 3-cyanophthalide to yield (acylamino)anthraquinones is also reported.

The Anticoagulant Activity of 3.3’-(p-Alkylthio-Benzylidene)-Bis-4-Hydroxycoumarins and Their Oxidation Products

1967 ◽  
Vol 17 (01/02) ◽  
pp. 277-286 ◽  
Author(s):  
Maria Gumińska ◽  
M Eckstein ◽  
Barbara Stachurska ◽  
J Sulko
Keyword(s):  
Biological Activity ◽  
Anticoagulant Activity ◽  
Oxidation Products ◽  
Para Position ◽  
Sulphur Atom ◽  
Group I ◽  
One Step

SummaryThe anticoagulant activity of 3.3’-(benzylidene)-bis-4-hydroxycoumarin derivatives has been estimated by one step Quick’s method. The derivatives contained the following groups in the para position of benzylidene residue: NCS- (I), CH3-S- (II), CH3-SO-(III), CH3-S02- (IV), C2H5-S- (V), C2H5-SO- (VI), C2H5-S02- (VII). All these compounds were much more active than 3.3’-(benzylidene)-bis-4-hydroxycoumarin itself.Compounds possessing the ethyl chain at the sulphur atom (V, VI, VII) were more active than methyl homologues (II, III, IV). Comparison of the activity of the series of thio-, sulphoxy-, and sulphonyl-derivatives showed that among methyl- and ethyl-derivatives those with the sulphoxy grouping (III, VI) displayed the greatest anticoagulant activity. The action of sulphonyl (IV, VII) and thio-derivatives (II, V) was weaker and shortest. The derivative with the NCS-group (I) possessed a relatively the lowest activity among the investigated compounds. 3.3’-(p-Ethylsulphoxybenzyl-idene)-bis-4-hydroxycoumarin (VI), with distinct biological activity reached about ½ of dicoumarol activity.

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