Kinetics and Thermodynamics of Oxidation of Some Meta-Substituted Anilinesby Tetrabutylammoniumbromochromatein Aqueous Acetic Acid Medium

Jabir, Shaik; Asghar, Basim H.; Mansoor, S. Sheik

doi:10.13005/ojc/330134

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“…The product formation is in accordance with the literature report [22]. The sequence of the oxidation is similar to that reported in the literature [23]. The negative entropy of activation in conjunction with other kinetic observations supports the mechanism (Scheme-I).…”

Section: Activation Parameterssupporting

confidence: 91%

Oxidation of Some Methoxy Anilines by Tetrabutylammoniumbromochromate in Aqueous Acetic Acid Medium: A Kinetics Study

Jabir¹,

Asghar²,

Mansoor³

2017

Asian J. Chem.

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The oxidation of aniline (A), 2,4-dimethoxy aniline (2,4-DMA), 2,6-dimethoxy aniline (2,6-DMA), 2,4,6-trimethoxy aniline (2,4,6-TMA) and 3,4,5-trimethoxy aniline (3,4,5-TMA) by tetrabutylammoniumbromochromate (TBABC) have been studied in 50 % acetic acid -50 % water medium in the presence of perchloric acid. The oxidation leads to the formation of the corresponding azobenzenes. The reaction is first order with respect to [TBABC], [S] and [H + ]. The reaction has been found to be catalyzed by H + ions. The reactions were studied at four different temperatures and thermodynamic parameters were calculated. The rates decreased in the order: 2,4,6-TMA > 2,6-DMA > 2,4-DMA > 3,4,5-TMA > aniline.

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Section: Activation Parameterssupporting

confidence: 91%