Oxidation of mandelic acid by alkaline potassium permanganate. A kinetic study

Panari, R. G.; Chougale, Ravindra B.; Nandibewoor, Sharanappa T.

doi:10.1002/(sici)1099-1395(199807)11:7<448::aid-poc23>3.0.co;2-a

Cited by 49 publications

(32 citation statements)

References 16 publications

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“…Evidence is provided by the fractional order found in [alanine]. This type of radical intermediate has also been observed in earlier work on the alkaline permanganate oxidation of aminoacids [55][56][57]. A bathochromic shift of 10 nm from 230 to 240 nm is observed for alanine The formation of the complex was also proved kinetically by the non-zero intercept of the plot of [Ru(III)]/k obs versus 1/[ Alanine].…”

Section: Effect Of Temperaturesupporting

confidence: 72%

Ruthenium(III) Catalysed Oxidation of L-Alanine by Alkaline Permanganate: A Kinetic and Mechanistic Approach

Chimatadar¹,

Kini²,

Nandibewoor³

2005

BioInorganic Reaction Mechanisms

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The kinetics of the ruthenium(III) catalysed oxidation of L-alanine by alkaline permanganate was studied spectrophotometrically using a rapid kinetic accessory. The reaction is first order with respect to [oxidant] and [catalyst] with an apparent less than unit order in [substrate] and [alkali] respectively. The results suggest the formation of a complex between the alanine and the hydroxylated species of ruthenium(III). The complex reacts further with the alkaline permanganate species in a rate-determining step, resulting in the formation of a free radical, which again reacts with the alkaline permanganate species in a subsequent fast step to yield the products. The reaction constants involved in the mechanism were calculated. There is a good agreement between observed and calculated rate constants under different experimental conditions. The activation parameters with respect to slow step of the mechanism were calculated and discussed.

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Section: Effect Of Temperaturesupporting

confidence: 72%

Ruthenium(III) Catalysed Oxidation of L-Alanine by Alkaline Permanganate: A Kinetic and Mechanistic Approach

Chimatadar¹,

Kini²,

Nandibewoor³

2005

BioInorganic Reaction Mechanisms

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“…A mechanism based on hydride transfer was generally suggested for the permanganate oxidation of alcohols both in acidic and alkali media 17–25. The same mechanism was proposed for some other oxidants as well 41–47.…”

Section: Resultsmentioning

confidence: 81%

“…In the oxidation of aliphatic alcohols in alkaline medium, alcoholate (alkoxide) anions are the reactive species, which may be oxidized by permanganate by means of direct electron 13–16 or hydride ion (H − ) abstraction 17–25. The dissociation constant of alcohols can be calculated from the kinetic results 13–16.…”

Section: Introductionmentioning

confidence: 99%

Permanganate oxidation of unsaturated alcohols in alkaline media

Jáky¹,

Simon‐Trompler²

2002

Int J of Chemical Kinetics

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“…The process Mn(VII)-» Mn(IV) can be divided into a number of partial steps and examined seperately. If [OH"] > 0.1 mol dm -3 , permanganate will be reduced to manganate in the first step and, owing to its much lower reactivity, further reaction with manganate will be much slower [5,6,7]. The Mn02 appears practically only after permanganate has completely disappeared from the system.…”

Section: Introductionmentioning

confidence: 99%

“…In strongly alkaline medium the stable reduction product [8,9] of permanganate ion is manganate ion, MnO^-. Mechanistic information to distinguish between a direct one-electron reduction to Mn(VI) (Scheme 1) and a reaction in which hypomanganate is formed in a two-electron step followed by rapid oxidation of hypomanganate ion [10] (Scheme 2) is not available.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Oxidative Deamination and Decarboxylation of L-Asparagine by Alkaline Permanganate: a Mechanistic Approach

Kembhavi¹,

Harihar²,

Nandibewoor³

2001

BioInorganic Reaction Mechanisms

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The kinetics of oxidative deamination and decarboxylation of L-asparagine (L-Aspg) by aqueous alkaline permanganate at constant ionic strength of 0.50 mol dm -3 were studied spectrophotometrically. The reaction exhibits first-order kinetics in [permanganate ion] and fractional-order dependences in [L-Aspg] and [alkali]. Initially added products such as aldehyde, ammonia and manganate have no significant effect on the rate of reaction. An increase in ionic strength and a decrease in dielectric constant of the medium increase the rate. The oxidation process in alkaline medium has shown to proceed via two paths: One a substrate dependent path, the other a substrate independent path. The constants involved in the mechanism were evaluated. There is a good agreement between observed and calculated rate constants. The activation paramaters with respect to slow step of path I and path II were calculated.

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Oxidation of mandelic acid by alkaline potassium permanganate. A kinetic study

Cited by 49 publications

References 16 publications

Ruthenium(III) Catalysed Oxidation of L-Alanine by Alkaline Permanganate: A Kinetic and Mechanistic Approach

Ruthenium(III) Catalysed Oxidation of L-Alanine by Alkaline Permanganate: A Kinetic and Mechanistic Approach

Permanganate oxidation of unsaturated alcohols in alkaline media

Kinetics of Oxidative Deamination and Decarboxylation of L-Asparagine by Alkaline Permanganate: a Mechanistic Approach

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