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Homogeneous Rate Constants (homogeneous + rate_constant)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

Kinetic Study of the Oxidation of Catechols in the Presence of Some Aza-crown Ethers by Digital Simulation of Cyclic Voltammograms

ELECTROANALYSIS, Issue 9 2009
Davood Nematollahi
Abstract The electrochemical oxidation of catechols (1) have been studied in the presence of diaza-18-crown-6 (DA18C6) (3a), diaza-15-crown-5 (DA15C5) (3b), and aza-15-crown-5 (A15C5) (3c) as nucleophiles in aqueous solution, by means of cyclic voltammetry and controlled-potential coulometry. The results indicate the participation of electrochemically generated o -benzoquinones (2) in Michael-type reaction with aza-crown ethers (3) to form the corresponding new o -benzoquinone-aza-crown ether adducts (5). Based on ECE mechanism, the observed homogeneous rate constants (kobs) of the reaction of o -bezoquinones (2) with aza-crown ethers (3) were estimated by comparing the experimental cyclic voltammograms with the digital simulated results. The calculated observed homogeneous rate constants (kobs) was found to vary in the order DA18C6>DA15C5>A15C5. [source]

Estimation of homogeneous rate constants of reaction of electrochemically generated ortho -benzoquinones with 1,3-indandione

INTERNATIONAL JOURNAL OF CHEMICAL KINETICS, Issue 11 2007
Davood Nematollahi
Electrochemical oxidation of some catechol derivatives has been studied in the presence of 1,3-indandione as nucleophile in aqueous solution, by means of cyclic voltammetry and controlled-potential coulometry. The results indicate the participation of electrochemically produced o -benzoquinones in the Michael reaction with 1,3-indandione to form the corresponding new catechol derivatives. On the basis of the EC mechanism, the observed homogeneous rate constants (kobs) of reaction of produced o -benzoquinones with 3-indandione were estimated by comparing the experimental cyclic voltammograms with the digitally simulated results. © 2007 Wiley Periodicals, Inc. Int J Chem Kinet 39: 605,613, 2007 [source]

Kinetic study of electrochemically induced Michael reactions of o -benzoquinones with 2-acetylcyclohexanone and 2-acetylcyclopentanone

JOURNAL OF PHYSICAL ORGANIC CHEMISTRY, Issue 1 2007
Davood Nematollahi
Abstract The reaction of electrochemically generated o -benzoquinones (2a-f) as Michael acceptors with 2-acetylcyclohexanone (ACH) and 2-acetylcyclopentanone (ACP), as nucleophiles has been studied in various pHs using cyclic voltammetry. The results indicate that the participation of o -benzoquinones (2a-f) in the Michael reaction with acetylcyclohexanone (ACH) to form the corresponding catechol derivatives (4a-f). Based on an EC mechanism, the homogeneous rate constants were estimated by comparing the experimental cyclic voltammetric responses with the digital simulated results. Copyright © 2007 John Wiley & Sons, Ltd. [source]