Silica-supported perchloric acid and potassium bisulfate as reusable green catalysts for nitration of aromatics under solvent-free microwave conditions

Kumar, M. Satish; Sriram, Y. Hemanth; Venkateswarlu, M.; Rajanna, K. C.; Sudhakar, M.; Venkanna, P.; Saiprakash, P. K.

doi:10.1080/00397911.2017.1387923

Cited by 18 publications

(8 citation statements)

References 22 publications

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“…It is also widely used as leavening agent in the preparation of cakes. At the same time it received remarkable attention as an efficient catalyst in several homogeneous and heterogeneous reactions [23][24][25][26][27][28][29][30][31]. Its catalytic activity is maninly attributed to the in situ generation of (H + ) ions due to the dissociation bisulfate ion (HSO 4 − ).…”

Section: Introductionmentioning

confidence: 99%

Potassium hydrogen sulfate mediated kinetics and mechanism of oxidation of certain polyols by Quinolinium bound Cr(VI) reagents

et al. 2020

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Potassium hydrogen sulfate (KHSO 4) mediated oxidation of certain alcohols (Polyols) has been studied by quinolinium bound Cr(VI) reagents like quinolinium dichromate (QDC) and quinolinium chlorochromate (QCC) at different temperatures. Reaction kinetics revealed second order kinetics with a first order in [Alcohol] and [Cr(VI) reagent] at constant bisulfate concentration. Ten fold variation of added [KHSO 4 ] enhanced the observed rateconstant (k′) by ten fold, showing first order dependence on [KHSO 4 ]. Most plausible mechanisms for QDC oxidation and QCC oxidation of polyols are proposed on the basis of observed kinetic features.

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Section: Introductionmentioning

confidence: 99%

Potassium hydrogen sulfate mediated kinetics and mechanism of oxidation of certain polyols by Quinolinium bound Cr(VI) reagents

et al. 2020

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“…Here, microwave‐assisted method is far better than conventional method in terms of reaction time and yield. In addition, after the completion of the reaction these catalysts can be easily recovered from the reaction mixture and reused many times make this method green and clean [46] …”

Section: Nitration By Transition Metal‐free Catalystmentioning

confidence: 99%

Synthetic Protocols for Aromatic Nitration: A Review

Patel

2021

ChemistrySelect

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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.

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“…Kumar et al reported the nitration of aromatics with silica supported perchloric acid or bisulfate under solvent-free micro-wave-driven conditions (Scheme 15 ) [ 83 ]. The green nitrating agent NaNO 2 in combination with the supported acidic catalyst yielded excellent results in short reaction times.…”

Section: Synthetic Applications In Heterogeneous Systemsmentioning

confidence: 99%

Organic Synthesis Using Environmentally Benign Acid Catalysis

Kokel

Schäfer

Török

2019

COS

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Recent advances in the application of environmentally benign acid catalysts in organic synthesis are reviewed. The work includes three main parts; (i) description of environmentally benign acid catalysts, (ii) synthesis with heterogeneous and (iii) homogeneous catalysts. The first part provides a brief overview of acid catalysts, both solid acids (metal oxides, zeolites, clays, ion-exchange resins, metal-organic framework based catalysts) and those that are soluble in green solvents (water, alcohols) and at the same time could be regenerated after reactions (metal triflates, heteropoly acids, acidic organocatalysts etc.). The synthesis sections review a broad array of the most common and practical reactions such as Friedel-Crafts and related reactions (acylation, alkylations, hydroxyalkylations, halogenations, nitrations etc.), multicomponent reactions, rearrangements and ring transformations (cyclizations, ring opening). Both the heterogeneous and homogeneous catalytic synthesis parts include an overview of asymmetric acid catalysis with chiral Lewis and Brønsted acids. Although a broad array of catalytic processes are discussed, emphasis is placed on applications with commercially available catalysts as well as those of sustainable nature; thus individual examples are critically reviewed regarding their contribution to sustainable synthesis.

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Silica-supported perchloric acid and potassium bisulfate as reusable green catalysts for nitration of aromatics under solvent-free microwave conditions

Cited by 18 publications

References 22 publications

Potassium hydrogen sulfate mediated kinetics and mechanism of oxidation of certain polyols by Quinolinium bound Cr(VI) reagents

Potassium hydrogen sulfate mediated kinetics and mechanism of oxidation of certain polyols by Quinolinium bound Cr(VI) reagents

Synthetic Protocols for Aromatic Nitration: A Review

Organic Synthesis Using Environmentally Benign Acid Catalysis

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