Kinetics of oxidation of α-hydroxy acids by chromium(VI) and cerium(IV).

Radhakrishnamurti, P. S.; Behera, T.Ch.

doi:10.1016/s0040-4039(00)89389-2

Cited by 1 publication

(3 citation statements)

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“…Recently Cox and Yates (14) have recommended the use of the excess acidity function X instead of the traditional acidity functions, because it gives important mechanistic information (15). The corresponding correlation equation for an A-2 scheme is [5] log k -log[H+] -n log = m*m'X + const.…”

Section: Resultsmentioning

confidence: 99%

“…until a linear fit of the left side of eq. [5] vs. X is obtained. Our findings indicate that, in a perchloric medium (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…If the oxidant attacks the alcohol group, a reaction mechanism of the Westheimer type (2) is suggested, with the modification given by Kwart and Francis (3). In this case, the rate-determining step is the intermolecular decomposition of a cyclic ester, giving the corresponding ketoacid (pyruvic acid) due to the breaking of the C-H bond in the a position (4)(5)(6)(7).…”

Section: Introductionmentioning

confidence: 99%

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Chromic oxidation of lactic acid in very strong acid media

Alvarez-Macho¹,

Montequi-Martin²

1990

Can. J. Chem.

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M A R~A PIEDAD ALVAREZ-MACHO and M A R~A ISABEL MONTEQUI-MARTIN. Can. J. Chern. 68,29 (1990). The oxidation of lactlc acid by chromic acid was studied at high concentrations of HCIO?, HN03, and H2S04 It was observed that the reaction rate depends not only on the acidity of the medium, but also on the nature of the mineral acid. The use of the Bunnett and Bunnett-Olsen criteria and the excess acidity concept allows us to propose a reaction mechanism of the A-2 type, the rate-determining step being a bimolecular process in whlch water participates as a nucleophile. The enthalpy and entropy of activation were determined; the decrease of the magnitude of these parameters when the acidity of the medium was increased I suggests the existence of a compensation effect.

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Section: Resultsmentioning

confidence: 99%

“…until a linear fit of the left side of eq. [5] vs. X is obtained. Our findings indicate that, in a perchloric medium (Fig.…”

Section: Resultsmentioning

confidence: 99%