Micellar effect on the reaction of picolinic acid catalyzed chromium(VI) oxidation of dimethyl sulfoxide in aqueous acidic media: A kinetic study

2001 ◽  
Vol 33 (3) ◽  
pp. 173-181 ◽  
Author(s):  
A. K. Das ◽  
S. K. Mondal ◽  
D. Kar ◽  
M. Das
Keyword(s):  
Kinetic Study ◽  
Dimethyl Sulfoxide ◽  
Picolinic Acid ◽  
Acidic Media ◽  
Chromium Vi ◽  
Acid Catalyzed ◽  
Micellar Effect

ChemInform Abstract: Mechanism of Picolinic Acid Catalyzed Chromium(VI) Oxidation of Alkyl Aryl and Diphenyl Sulfides

ChemInform ◽  
2010 ◽  
Vol 22 (8) ◽  
pp. no-no
Author(s):  
C. SRINIVASAN ◽  
S. RAJAGOPAL ◽  
A. CHELLAMANI
Keyword(s):  
Picolinic Acid ◽  
Alkyl Aryl ◽  
Chromium Vi ◽  
Acid Catalyzed

Micellar Effect on the Catalytic Co-Oxidation of Dimethyl Sulfoxide and Oxalic Acid by Chromium(VI) in Aqueous Acid Media: A Kinetic Study

2005 ◽  
Vol 30 (3) ◽  
pp. 215-226 ◽  
Author(s):  
Bidyut Saha ◽  
Monirul Islam ◽  
Asim K. Das
Keyword(s):  
Electron Transfer ◽  
Oxalic Acid ◽  
Dimethyl Sulfoxide ◽  
Ternary Complex ◽  
Single Step ◽  
Experimental Conditions ◽  
Acid Media ◽  
Aqueous Acid ◽  
Chromium Vi ◽  
Micellar Effect

The CrVI oxidation of a mixture of dimethyl sulfoxide (DMSO) and oxalic acid (OXH2) in aqueous acid media occurs much faster than that of either of the two substrates alone (DMSO reacts extremely slowly under the experimental conditions). In the mixture, both substrates undergo oxidation simultaneously in a ternary complex of CrVI through a three electron transfer step (i.e. CrVI → CrIII), two electrons from DMSO and one electron from oxalic acid. Hitherto there has been a debate regarding the existence of a 3e transfer in a single step. The micellar effect may be considered as a probe for 3e transfer in a single step.

Benzyl ethers of methyl α-D-glucopyranoside

1980 ◽  
Vol 45 (7) ◽  
pp. 1959-1963 ◽  
Author(s):  
Dušan Joniak ◽  
Božena Košíková ◽  
Ludmila Kosáková
Keyword(s):  
Kinetic Study ◽  
Spectrophotometric Determination ◽  
Reductive Cleavage ◽  
Ether Bond ◽  
Benzyl Ethers ◽  
Acid Catalyzed ◽  
Model Substances ◽  
Hydrolysis Of

Methyl 4-O-(3-methoxy-4-hydroxybenzyl) and methyl 4-O-(3,5-dimethoxy-4-hydroxybenzyl)-α-D-glucopyranoside and their 6-O-isomers were prepared as model substances for the ether lignin-saccharide bond by reductive cleavage of corresponding 4,6-O-benzylidene derivatives. Kinetic study of acid-catalyzed hydrolysis of the compounds prepared was carried out by spectrophotometric determination of the benzyl alcoholic groups set free, after their reaction with quinonemonochloroimide, and it showed the low stability of the p-hydroxybenzyl ether bond.

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