Potassium Permanganate In Alkaline Solutions Research Articles

Novel Synthesis of Diketopectate Coordination Biopolymer Derivatives as Alternative Promising In Biomedicine, Pharmaceutics and Food Industrial Applications

Diketopectates (PDK) was quantitatively synthesized by the oxidation of pectin sol with potassium permanganate in alkaline solutions at pH`s > 12. The yield was 97.3 %. The chemical structure of such synthesized pectate-diketones was elucidated by elemental analysis and spectroscopic data. Sol-gel transformation and/or precipitation were observed when PDK was added to polyvalent metal ion electrolytes. The reaction mechanism of synthesis process was suggested and discussed.

Spectrophotometric evidence for the formation of short-lived hypomanganate(V) and manganate(VI) transient species during the oxidation of K-carrageenan by alkaline permanganate

Spectrophotometric detection of the formation of short-lived hypomanganate(V), [ KCAR – Mn V O 4 3 - ] , and manganate(VI), [ KCAR – Mn VI O 4 2 - ] , intermediates has been confirmed through the oxidation of K-carrageenan (KCAR) by potassium permanganate in alkaline solutions of pH’s ⩾12 using a conventional spectrophotometer. The short-lived transient species were characterized and a mechanism consistent with experimental observations is suggested.

Kinetics and mechanism of decomposition of intermediate complex during oxidation of pectate polysaccharide by potassium permanganate in alkaline solutions

AbstractThe kinetics of decomposition of an [Pect·MnVIO42−] intermediate complex have been investigated spectrophotometrically at various temperatures of 15–30°C and a constant ionic strength of 0.1 mol dm−3. The decomposition reaction was found to be first‐order in the intermediate concentration. The results showed that the rate of reaction was base‐catalyzed. The kinetic parameters have been evaluated and found to be ΔS≠ = − 190.06 ± 9.84 J mol−1 K−1, ΔH≠ = 19.75 ± 0.57 kJ mol−1, and ΔG≠ = 76.39 ± 3.50 kJ mol−1, respectively. A reaction mechanism consistent with the results is discussed. © 2002 Wiley Periodicals, Inc. Int J Chem Kinet 35: 67–72, 2003

Novel synthesis of diketocarboxymethyl‐celluose as bipolymer precursors

Abstract2,3‐Diketocarboxymethylcellulose was prepared by the oxidation of carboxymethylcellulose (CMC) with potassium permanganate in alkaline solutions (pH ≥ 12) with a yield of 98.1%. IR spectroscopy and microanalysis have elucidated the chemical structure of the synthesized macromolecule (CMCK). A tentative reaction mechanism for oxidation is suggested. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 1019–1023, 2002

ChemInform Abstract: Alginate Polyelectrolyte Ionotropic Gels. Part 18. Oxidation of Alginate Polysaccharide by Potassium Permanganate in Alkaline Solutions: Kinetics of Decomposition of Intermediate Complex

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Alginate polyelectrolyte ionotropic gels. XVIII. Oxidation of alginate polysaccharide by potassium permanganate in alkaline solutions: Kinetics of decomposition of intermediate complex

AbstractThe kinetics of decomposition of [Alg · Mn VIO42−] intermediate complex have been investigated spectrophotometrically at a constant ionic strength of 0.5 mol dm−3. The decomposition reaction was found to be first‐order in the intermediate concentration. The results showed that the rate of reaction was base‐catalyzed. The kinetic parameters have been evaluated and found to be ΔS‡ = −103.88±6.18 J mol−1 K−1, ΔH‡ = 51.61 ± 1.02 kJ mol−1, and ΔG‡ = 82.57 ± 2.86 kJ mol−1, respectively. A reaction mechanism consistent with the results is discussed. © 1993 John Wiley & Sons, Inc.

Alginate polyelectrolyte ionotropic gels. VI. Novel synthesis of diketoalginates as biopolymer precursors

AbstractSodium 2,3‐diketoalginate was quantitatively prepared by the oxidation of sodium alginate with potassium permanganate in alkaline solution at pH's > 12. The yield was 96.5%. The structure of the diketone was elucidated by microanalysis and spectroscopic data. It was found that the diketoalginate caused no gelation or precipitation with copper(II), nickel(II), or cobalt(II) divalent metal ions. © 1993 John Wiley & Sons, Inc.

Studies on the oxidative decomposition of cyanide ion by potassium permanganate

Abstract In order to remove cyanide ion from wastewater, application of potassium permanganate oxidation was investigated. The proposed method is based on oxidation of cyanide ion by potassium permanganate in alkaline solutions. When this method was applied to industrial wastewater, cyanide ion was almost completely decomposed after 10 min without formation of toxic compounds such as cyanogen chloride . The most effective decomposition was observed at above pH 10 .The decomposition rate by potassium permanganate was similar to that of sodium hypochlorite. The mechanism of oxidatiye decomposition of cyanide ion by potassium permanganate is described in this paper.

Nucleophilic substitution reactions of 2-chlorobenzimidazoles. Part III. Preparation of 2-alkoxybenzimidazoles from 2-chloro-1-isopropenylbenzimidazole

The reaction of sodium alkoxides with 2-chloro-1-isopropenylbenzimidazole yields 2-alkoxy-1-isopropenyl-benzimidazoles, which may be oxidised by potassium permanganate in alkaline solution to give 2-alkoxybenzimidazoles unsubstituted in the 1-position.

Oxidation of trivalent cerium with potassium permanganate in alkaline solutions

Oxidation of trivalent cerium with KMnO4 in alkaline carbonate mixture is not possible owing to the instability of the solution and to the sluggishness of the reaction. Reduction of KMnO4 with Ce3+ solution fails to give quantitative results in absence of telluric acid. Good results are obtained in presence of telluric acid provided that the alkalinity of the reaction medium is not less than 1 N, in order to overcome the effect of acid present in the cerous solution.

Potentiometric determination of arsenic by potassium permanganate in alkaline solutions

AbstractThe oxidation of trivalent arsenic by potassium permanganate in alkaline solutions has been studied potentiometrically. The end points are largely affected by the concentration of the reactants and the alkalinity of the reaction medium. It is found that, provided the proper alkalinity is chosen, good results could be obtained. At alkalinities as low as 0.1NNaOH, dilute solutions could be titrated, so that the method can be applied for the determination of micro‐quantities of arsenic.

The Stability of Potassium Permanganate in Alkaline Solutions Containing Telluric Acid

The Stability of Potassium Permanganate in Alkaline Solutions Containing Telluric Acid

Potentiometric method for the macro- and micro-determination of thallium by oxidation with potassium permanganate in alkaline solutions

Potentiometric method for the macro- and micro-determination of thallium by oxidation with potassium permanganate in alkaline solutions

The mechanism of decomposition of potassium permanganate in alkaline solution. Part II. The use of water enriched in 18O as solvent

The first page of this article is displayed as the abstract.

ヒノキ酸の構造研究 (第4報)

Oxidation of bicycloisohinokiic acid with potassium permanganate in alkaline solution yielded an oily dicarboxylic acid, in which one of the carboxyl group was found to be quaternary by titration. The p-bromophenacyl ester, m.p. 134-135°, of this acid was found to be identical with the derivative prepared from β-ionone via bicyclodehydrofarnesenic acid. From the results of oxidation, it has been proved that bicycloisohinokiic acid is 1, 1, 7, 10-tetramethyl-Δ5, 7-dihydronaphthalene-6-carboxylic acid.

809. The mechanism of decomposition of potassium permanganate in alkaline solution and its bearing on oxidation by this reagent

809. The mechanism of decomposition of potassium permanganate in alkaline solution and its bearing on oxidation by this reagent

The presence of acid esters of l‐nor‐ecgonine in coca leaves

AbstractThe amino acid formerly1) separated from Java coca leaves is l‐nor‐ecgonine, which Einhorn has obtained by oxidation of l‐ecgonine with potassium permanganate in alkaline solution. It is present in the leaves as acid esters. The calcium salis of these esters and also that of l‐nor‐ecgonine itself are soluble in the mixture of benzene and methyl alcohol boiling at 58° and also in the mixture of benzene and ethyl alcohol boiling at 68°.

THE HIGHLY UNSATURATED ACIDS IN SARDINE OIL. XIV. OXIDATION OF POTASSIUM CLUPANODONATE WITH POTASSIUM PERMANGANATE IN AQUEOUS SOLUTION

Abstract Potassium clupanodonate has been oxidised with potassium permanganate in alkaline solution under cooling. Among the oxidation products, propionic, acetic and succinic acids have been separated. Also the presence of malonic acid is indicated. Of these compounds acetic acid is believed to be formed by a further degradation of malonic acid, and consequently the above results show that the respective groups jointed by the ethylenic linkings in clupano-donic acid are CH3·CH2·CH=, =CH·CH2·CH=, three of =CH·(CH2)2·CH=, and =CH·(CH2)2·COOH, provided the terminal group containing the carboxyl group is assumed to be =CH·(CH2)2·COOH. The results of the present experiment agree fully with those obtained in tile previous experiments of the ozonolysis of amyl clupanodonate and the permanganate oxidation of methyl clupanodonate in acetone solution.