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Chimatadar, Shivamurti A.; Koujalagi, Sangappa B.; Nandibewoor, Sharanappa T.

doi:10.1023/a:1013495504561

Cited by 13 publications

(36 citation statements)

References 6 publications

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“…The ruthenium(III) catalyst is understood to be present in the aqueous acid medium mainly as [Ru(H 2 O) 6 3? ] [15,16]. The ruthenium(III) catalyzed oxidation of thiamine hydrochloride is greatly facilitated in perchloric acid medium and the reason may be that cerium(IV) and ruthenium(III) species such as Ce(OH) 3?…”

Section: Resultsmentioning

confidence: 99%

Ruthenium(III) mediated oxidation of thiamine hydrochloride by cerium(IV) in perchloric acid medium: a kinetic and mechanistic approach

Byadagi

Naik

Savanur

et al. 2009

Reac Kinet Mech Cat

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Oxidation of thiamine hydrochloride (vitamin B 1 ) by cerium(IV) mediated by micro amounts (10 -6 mol dm -3 ) of ruthenium(III) in aqueous perchloric acid medium has been studied spectrophotometrically at 25°C and I = 1.10 mol dm -3 . The reaction is first order in both cerium(IV) and ruthenium(III) concentrations. The order with respect to vitamin B 1 concentration varies from first order to zero order as the vitamin B 1 concentration increases. An increase in perchloric acid concentratrion decreases the reaction rate. The active species of oxidant and catalyst are [Ce(OH) 3? ] and [Ru(H 2 O) 6 ] 3? . A possible mechanism is proposed and reaction constants involved have been determined. The activation parameters for the slow step of the mechanism are determined.

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Section: Resultsmentioning

confidence: 99%

Ruthenium(III) mediated oxidation of thiamine hydrochloride by cerium(IV) in perchloric acid medium: a kinetic and mechanistic approach

Byadagi

Naik

Savanur

et al. 2009

Reac Kinet Mech Cat

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“…Nowadays, the development of newer chromium(VI) reagents [1][2][3][4][5][6][7] for the oxidation of organic substrates continues to be a subject of interest. The reagent employed in this investigation, quinoliniumdichromate (QDC), (C9H7NH + )2Cr2O7 2-, has been found to be a useful and versatile oxidant 6 that deserves further evaluation.…”

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confidence: 99%

Oxidation of Isoniazid by Quinolinium Dichromate in an Aqueous Acid Medium and Kinetic Determination of Isoniazid in Pure and Pharmaceutical Formulations

2004

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The kinetics of oxidation of isoniazid in acidic medium was studied spectrophotometrically. The reaction between QDC and isoniazid in acid medium exhibits (4:1) stoichiometry (QDC:isoniazid). The reaction showed first order kinetics in quinolinium dichromate (QDC) concentration and an order of less than unity in isoniazid (INH) and acid concentrations. The oxidation reaction proceeds via a protonated QDC species, which forms a complex with isoniazid. The latter decomposes in a slow step to give a free radical derived from isoniazid and an intermediate chromium(V), which is followed, by subsequent fast steps to give the products. The reaction constants involved in the mechanism are evaluated. Isoniazid was analyzed by kinetic methods in pure and pharmaceutical formulations.

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“…Cinnamyl alcohol was used in perfumery and as a deodorant. Kinetic studies on the oxidation of allyl alcohol with different oxidants such as Chloramine-T, 7,8 , potassium hexacyanoferrate(II) 9 , pyridinium fluorochromate 10 , potassium bromate 11 , acid bromate 12 , quinolinium dichromate 13 , and imidazolium dichromate 14 have been reported.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of α,β-Unsaturated Alcohols by Quinaldinium Fluorochromate

Sekar¹,

Periyasamy²

2013

ILCPA

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The kinetics of oxidation of α,β-unsaturated alcohols (allyl alcohol, Crotyl alcohol, Cinnamyl alcohol) by quinaldinium fluorochromate has been studied in aqueous acid medium at 313 K. α,β-unsaturated alcohols were converted to the corresponding acrolein, crotonaldehyde and cinnamaldehyde. The reaction is first order each in oxidant, substrate and H + . The decrease in dielectric constant of the medium increases the rate of the reaction. Increase in ionic strength by the addition of sodium perchlorate has no effect on the rate constant. There is no polymerization with acrylonitrile. The reaction has been conducted at four different temperatures and activation parameters were calculated. From the observed kinetic results a suitable mechanism consistent with rate law has been proposed. The relative reactivity order was found to be Cinnamyl alcohol > Crotyl alcohol > Allyl alcohol.

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Untitled

Cited by 13 publications

References 6 publications

Ruthenium(III) mediated oxidation of thiamine hydrochloride by cerium(IV) in perchloric acid medium: a kinetic and mechanistic approach

Ruthenium(III) mediated oxidation of thiamine hydrochloride by cerium(IV) in perchloric acid medium: a kinetic and mechanistic approach

Oxidation of Isoniazid by Quinolinium Dichromate in an Aqueous Acid Medium and Kinetic Determination of Isoniazid in Pure and Pharmaceutical Formulations

Oxidation of α,β-Unsaturated Alcohols by Quinaldinium Fluorochromate

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