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首页> 外文期刊>Journal of the Indian Chemical Society >The kinetics and mechanism of oxidation of aliphatic aldehydes by benzyltriethylammonium chlorochromate
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The kinetics and mechanism of oxidation of aliphatic aldehydes by benzyltriethylammonium chlorochromate

机译:氯铬酸苄基三乙基铵氧化脂族醛的动力学及其机理

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The oxidation of six aliphatic aldehydes by benzyltriethylammonium chlorochromate (BTEACC) in dimethyl sulfoxide (DMSO) leads to the formation of corresponding carboxylic acids.The reaction is first order each in BTEACC and the aldehyde.The reaction is catalysed by hydrogen ions.The hydrogen-ion dependence has the form : k_(obs) = a + b[H~+].The oxidation of deuteriated acetaldehyde,MeCDO,exhibited a substantial primary kinetic isotope effect (k_H/ k_D = 5.89 at 298 K).The oxidation of acetaldehyde has been studied in 19 different organic solvents.The solvent effect has been analysed using Taft's and Swain's multiparametric equations.The rate constants correlate well with Taft's sigma values; reaction constants being negative.A mechanism involving transfer of hydride ion has been suggested.
机译:氯亚甲基苄基三乙基铵在二甲亚砜(DMSO)中氧化六种脂肪族醛导致形成相应的羧酸,该反应在BTEACC和醛中均为一级,该反应由氢离子催化。离子依赖性的形式为:k_(obs)= a + b [H〜+]。氘代乙醛MeCDO的氧化表现出明显的一级动力学同位素效应(在298 K时k_H / k_D = 5.89)。已经在19种不同的有机溶剂中进行了研究,使用塔夫脱(Taft)和斯文(Swain)多参数方程分析了溶剂的影响。速率常数与塔夫脱的sigma值密切相关;反应常数为负。有人提出了涉及氢离子转移的机理。

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