Kinetics of oxidation of aliphatic aldehydes by quinolinium dichromate in aqueous-acetic acid medium: A mechanistic approach

被引：0

作者：

Hiran, BL ^{[1
]}

Nalwaya, N ^{[1
]}

Joshi, V ^{[1
]}

Jain, R ^{[1
]}

机构：

[1] ML Sukhadia Univ, Coll Sci, Dept Chem, Chem Kinet Lab, Udaipur 313001, India

来源：

AFINIDAD | 2005年 / 62卷 / 515期

关键词：

aldehydes; oxidation; QDC; kinetics;

D O I：

暂无

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Oxidations of aliphatic aldehydes by quinolinium dichromate (QDC) in aqua-acetic acid medium revealed that the rate is first order in [QDC] and [aldehyde] and second order with respect to [H+]. Zucker-Hammett plots proved that water molecule acts as proton abstracting agent in slow step. Hydrated aldehyde and protonated QDC have been suggested as reactive species. The mechanism of reaction involves the formation of chromic-ester, followed by C-H bond fission in slow step, where the products are carboxylic acids. The order of reactivity of aldehyde was found to be formaldehyde > acetaldehyde > propionaldehyde > valeraldehyde. Also rate law has been suggested.

引用

页码：65 / 69

页数：5

共 21 条

[1]

AGARWAL A, 1990, J CHEM RES, V86

[2]

AMIS ES, 1966, SOLVENT EFFECTS REAC, P42

[3]

ARUNA K, 1994, ASIAN J CHEM, V6, P542

[4]

BALASUBRAMANIAN K, 1986, INDIAN J CHEM B, V25, P326

[5] KINETICS OF REACTIONS IN MODERATELY CONCENTRATED AQUEOUS ACIDS .2. AN EMPIRICAL CRITERION OF MECHANISM [J].

BUNNETT, JF .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1961, 83 (24) :4968-&

[6]

BUNNETT JF, 1966, CAN J CHEM, V44, P1927

[7]

Chaubey GS, 2003, OXID COMMUN, V26, P532

[8]

Chaubey GS, 2003, OXID COMMUN, V26, P526

[9]

Dey D, 1998, OXID COMMUN, V21, P62

[10]

EILCHELBERGER WC, 1933, J AM CHEM SOC, V55, P3633

← 1 2 3 →