Oxidation of Some Methoxy Anilines by Tetrabutylammoniumbromochromate in Aqueous Acetic Acid Medium: A Kinetics Study
作者:Shaik Jabir、Basim H. Asghar、S. Sheik Mansoor
DOI:10.14233/ajchem.2017.20656
日期:——
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.
苯胺(A)、2,4-二甲氧基苯胺(2,4-DMA)、2,6-二甲氧基苯胺(2,6-DMA)、2,4,6-三甲氧基苯胺(2,4,6 -TMA) 和 3,4,5-三甲氧基苯胺 (3,4,5-TMA) 在高氯酸存在下,在 50% 乙酸 – 50% 水介质中通过四丁基溴铬酸铵 (TBABC) 进行了研究。氧化导致形成相应的偶氮苯。该反应对于 [TBABC]、[S] 和 [H+] 为一级反应。已发现该反应是由H+离子催化的。在四种不同温度下研究了反应并计算了热力学参数。速率按顺序降低:2,4,6-TMA > 2,6-DMA > 2,4-DMA > 3,4,5-TMA > 苯胺。