Chromic oxidation of lactic acid in very strong acid media

1990 ◽  
Vol 68 (1) ◽  
pp. 29-32 ◽  
Author(s):  
María Piedad Alvarez-Macho ◽  
María Isabel Montequi-Martin
Keyword(s):  
Lactic Acid ◽  
Chromic Acid ◽  
Strong Acid ◽  
Mineral Acid ◽  
Acid Oxidation ◽  
Acid Media ◽  
Chromic Acid Oxidation ◽  
Rate Determining Step ◽  
Entropy Of Activation ◽  
High Concentrations

The oxidation of lactic acid by chromic acid was studied at high concentrations of HClO4, HNO3, and H2SO4. 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 which 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 suggests the existence of a compensation effect. Keywords: chromic acid, oxidation, lactic acid, acidic media.

Efficient combination of promoter and catalyst for chromic acid oxidation of propan-2-ol to acetone in aqueous acid media at room temperature

2013 ◽  
Vol 101 ◽  
pp. 294-305 ◽  
Author(s):  
Kakali Mukherjee ◽  
Rumpa Saha ◽  
Aniruddha Ghosh ◽  
Sumanta K. Ghosh ◽  
Bidyut Saha
Keyword(s):  
Room Temperature ◽  
Chromic Acid ◽  
Acid Oxidation ◽  
Acid Media ◽  
Aqueous Acid ◽  
Chromic Acid Oxidation

ChemInform Abstract: CHROMIC ACID OXIDATION OF LACTIC ACID CATALYSED BY MANGANESE(II)

1975 ◽  
Vol 6 (17) ◽  
Author(s):  
A. A. BHALEKAR ◽  
C. L. JAIN ◽  
R. SHANKER ◽  
G. V. BAKORE
Keyword(s):  
Lactic Acid ◽  
Chromic Acid ◽  
Acid Oxidation ◽  
Chromic Acid Oxidation

Chromic Acid Oxidation of Lactic Acid Catalysed by Manganese(II)

1975 ◽  
Vol 30 (1-2) ◽  
pp. 73-78 ◽  
Author(s):  
A. A. Bhalekar ◽  
C. L. Jain ◽  
R. Shanker ◽  
G. V. Bakore
Keyword(s):  
Lactic Acid ◽  
Chromic Acid ◽  
Activation Parameters ◽  
Bond Rupture ◽  
Acid Oxidation ◽  
Chromic Acid Oxidation ◽  
Rate Limiting Step ◽  
Ph Range ◽  
Rate Limiting ◽  
Uncatalysed Reaction

Mn(II) ion catalysis in the oxidation of lactic acid by chromic acid has been investigated between the pH range 2.0 to 4.0; [H+] = 0.1 to 0.4 and [H+] ≥1.1 M. Activation parameters for catalysed and uncatalysed reactions have been evaluated. While C—H bond rupture occurs in the uncatalysed reaction, the rate limiting step of the catalysed reaction involves C-C bond fission.

Kinetics of the Oxidation of Aliphatic Aldehydes by Chromic Acid

1971 ◽  
Vol 26 (5) ◽  
pp. 383-385 ◽  
Author(s):  
C. Goswami ◽  
K. K. Banerji
Keyword(s):  
Acetic Acid ◽  
Chromic Acid ◽  
Activation Parameters ◽  
Acid Oxidation ◽  
First Order ◽  
Chromic Acid Oxidation ◽  
Rate Determining Step ◽  
Reversible Formation ◽  
Kinetics Of ◽  
Chromate Ion

The kinetics of chromic acid oxidation of propanaldehyde, butyraldehyde and isobutyraldehyde in aq. acetic acid have been studied. The product of the oxidation is the corresponding carboxylic acid. The reaction is of first order with respect to each the acid chromate ion, HCrO4⊖, and the aldehyde but of second order to hydrogen ion. The rate increases with proportion of acetic acid in the solution. The activation parameters for the oxidation and enolisation reactions have been evaluated. The rate of enolisation under similar condition is less than that of oxidation. A mechanism in which the first step is the rapid reversible formation of a chromate ester followed by a hydrideion transfer in the rate determining step has been suggested.

Kinetics and mechanism of chromic acid oxidation of lactic acid

Tetrahedron ◽  
1983 ◽  
Vol 39 (1) ◽  
pp. 143-147 ◽  
Author(s):  
P.C. Samal ◽  
B.B. Pattnaik ◽  
S.Ch.Dharma Rao ◽  
S.N. Mahapatro
Keyword(s):  
Lactic Acid ◽  
Chromic Acid ◽  
Kinetics And Mechanism ◽  
Acid Oxidation ◽  
Chromic Acid Oxidation
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