Kinetics and mechanism of quinolinium dichromate mediated oxidation of sugar alcohols in Bronsted acid media

Kodali, Satish Babu; Jakku, Narendar Reddy; Kamatala, Chinna Rajanna; Yerraguntla, Rajeshwar Rao

doi:10.1002/kin.21339

Cited by 3 publications

(3 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some chromium VI reagents are well established, viz, QBC, QDC, PCC, PDC, …. The kinetics of oxidation of poly alcohols has been studied by QBC in aqueous sulphuric acid media 6 as an effective oxidant under nonaqueous conditions. QBC has been used as a mild selective oxidizing reagent in synthetic organic chemistry 7 .…”

Section: Novel Studies Of Chromium (Vi) As An Oxidantmentioning

confidence: 99%

Oxidation of Perfumery Secondary Alcohols by Nicotinium Dichromate; A Kinetic Study

Surulivel

Dharmaraja²,

Srinivasan³

et al. 2022

Int J Life Sci Pharm Res

View full text Add to dashboard Cite

Chemical kinetics is mainly concerned with studying the factors that change the reaction rate and the response mechanism. The present paper investigates the rate law for the reaction, order of the reaction of secondary alcohols(menthol) and compares it to other secondary alcohols like Borneol and Isoborneol. Diagnose the product of the oxidation reaction. The kinetics of oxidation of perfumery secondary alcohols [menthol], [Borneol], and [Isoborneol] by NDC have been studied in the aqueous acetic acid medium at 303K. The secondary perfumery alcohols were converted to the corresponding carbonyl compounds. The order concerning [Subs], [Oxi], and [H+] ions concentration is found to be one. The decrease in the dielectric constant of the medium enhances the rate of the reaction. The ionic strength of the medium has no significant effect on the reactivity of the response; it does not induce the polymerization of Acrylonitrile, indicating the absence of free radical pathway. The added Mn2+ ions show the reaction rate was slightly increasing order. The reaction has been studied at four different temperatures Eyring equation is used to calculate the thermodynamic parameters like Gibbs free energy change (ΔG#), entropy change (ΔS#), and enthalpy change (ΔH#). On increase in the temperature of the reaction, the rate of reaction increased abruptly. There was a decrease in entropy (ΔS#) of the system indicated by the value of entropy which showed some restriction in the freedom movement of the molecules. It was observed that the reactivity follows Menthol<Isoborneol<Borneol. Based on steric factors, structure, and isomeric characteristics of the alcohols under investigation.

show abstract

Section: Novel Studies Of Chromium (Vi) As An Oxidantmentioning

confidence: 99%

Oxidation of Perfumery Secondary Alcohols by Nicotinium Dichromate; A Kinetic Study

Surulivel

Dharmaraja²,

Srinivasan³

et al. 2022

Int J Life Sci Pharm Res

View full text Add to dashboard Cite

show abstract

“…On other hand quinolinium chlorochromate (QCC) protonated and followed by forming [QHOCr(OH)(Cl)NO 2 ] species. This both nitrated species of QDC and QCC individually react with aromatic species to yield nitrated product [40] …”

Section: Nitration By Transition Metal‐free Catalystmentioning

confidence: 99%

“…This both nitrated species of QDC and QCC individually react with aromatic species to yield nitrated product. [40] Deng and co-workers developed nitration of naphthalene by using HY-Zeolite as a catalyst in acetonitrile solvent (Scheme 32). In this process HY-Zeolite catalyst modified by metal Fe, Cu, Mg, and Zn.…”

Section: Nitration By Transition Metal-free Catalystmentioning

confidence: 99%

Synthetic Protocols for Aromatic Nitration: A Review

Patel

2021

ChemistrySelect

View full text Add to dashboard Cite

Nitration of aromatic compounds represents a powerful and widely used transformation that allows introducing nitro group into aromatic systems. New synthetic strategies for aromatic nitration are deeply needed, including highly efficient and selective nitration methods. Aromatic nitration plays an important part in the industry, as the main use of nitration is to produce important products such as dyes & intermediate compounds, drugs, and Agrochemicals. The electrophilic aromatic nitration is most studied and important transformation in industrial process. This review will describe different possible methodologies that apply to this fundamental transformation with special attention to the most recent development that lasted from 2017–2020. The main pros and cons of recent nitration methods are briefly described with their specific reaction mechanism and highlighting the most important feature of the present aromatic nitration method.

show abstract

Redox kinetics of methylene green: Titanium trichloride as a novel photo redox agent

Nadeem,

Saeed

2024

Coloration Technology

View full text Add to dashboard Cite

The kinetics of the redox reaction of methylene green (MG) and the novel photo‐redox agent titanium trichloride (TiCl3) in water were investigated by real‐time spectrophotometric analysis of the change in absorbance of the reaction mixture at 655 nm. The novelty of this redox reaction is that the TiCl3 is an inorganic compound in contrast to the previously studied organic redox couples. The redox reaction was analysed in depth and the effects of the concentration of the TiCl3, MG, pH, dielectric constant, ionic strength, metal ions, and temperature on the reaction kinetics were observed. The rate of reaction had a direct relationship with the pH, dielectric constant, and ionic strength of the reaction medium, while an increase in temperature decreased the rate of reaction. The activation energy (Ea) was calculated by the Arrhenius relation, and the other thermodynamic parameters, such as enthalpy change of activation (∆H*), free energy change of activation (∆G*), and entropy change of activation (∆S*) were also evaluated to support the findings of the kinetic measurements. The presence of any reaction intermediate other than the species in the reaction mechanism was ruled out by the spectroscopic analysis of the reaction mixture and Michaelis–Menten plot while the absence of any free radicals was confirmed by the negative polyacrylamide test. A reaction mechanism for the redox reaction of MG+ and TiCl3 was proposed based on the different excited states of the MG+ involved in the reaction and the results of the product analysis. The decolourisation of MG by the TiCl3 is overall a second‐order reaction and is significantly affected by the pH of the reaction medium. The overall rate law for the redox reaction of MG and TiCl3 is as follows.

show abstract

Kinetics and mechanism of quinolinium dichromate mediated oxidation of sugar alcohols in Bronsted acid media

Cited by 3 publications

References 26 publications

Oxidation of Perfumery Secondary Alcohols by Nicotinium Dichromate; A Kinetic Study

Oxidation of Perfumery Secondary Alcohols by Nicotinium Dichromate; A Kinetic Study

Synthetic Protocols for Aromatic Nitration: A Review

Redox kinetics of methylene green: Titanium trichloride as a novel photo redox agent

Contact Info

Product

Resources

About