An effective lactic acid-modified Hβ zeolite for synthesis of bis(indolyl)methanes

Bai, Guo Yi; Ma, Zheng; Shi, Lingjuan; Li, Tianyu; Han, Jie; Chen, Guofeng; Li, Na; Лю, Пэйдэ

doi:10.1007/s11164-012-0567-0

Cited by 12 publications

(8 citation statements)

References 22 publications

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“…The number of the acid centers in the catalyst, as well as its strength, was measured via temperature-programmed desorption of ammonia (NH 3 -TPD). Two major NH 3 -desorption peaks were observed in the ranges of 150–250 °C ( T 1 ) and 250–500 °C ( T 2 ) (Figure ), corresponding to the weak and strong acid sites, respectively . Based on the peak areas, the amounts of the weak, strong, and total acids were quantitatively obtained (Table ).…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Catalytic Properties of Mordenites via an Alkali–Acid Treatment and by Loading Nickel–Cerium during o-Ethyltoluene Isomerization

Cao

Wang

et al. 2021

ACS Omega

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The catalytic performance of the selective isomerization of oethyltoluene (O-ET) is crucial to increasing the m-ethyltoluene (M-ET) and pethyltoluene (P-ET) yields. During the isomerization of O-ET, traditional (commercial) mordenites (HM) are generally limited by a high reaction temperature (235 °C), as well as a low yield of the isomerization product (49.0%). In this study, micro-mesoporous mordenites were obtained by treating commercial mordenites with NaOH, NaOH−HNO 3 , and NaOH−mixed acid (HNO 3 −oxalic). Thereafter, their structure, porosity, and acidity were investigated via X-ray diffraction, transmission electron microscopy, inductively coupled plasma, N 2 sorption, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy of pyridine, temperature-programmed desorption of ammonia, and nuclear magnetic resonance. Among the various treated samples, the accessibility of the acidic sites and the B/L value of the alkali− mixed HNO 3 −oxalic one were enhanced, achieving the highest yield (53.6%) and lowest reaction temperature (165 °C), thus significantly reducing the energy consumption of the reaction process. Furthermore, Ni and Ce were successfully loaded via the incipient wetness impregnation of the micro-mesoporous mordenite to significantly prolong the catalytic life. This study affords a new strategy for obtaining high M-ET and P-ET yields from the isomerization of O-ET in mixed C 9 aromatics on an industrial scale.

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Section: Resultsmentioning

confidence: 99%

Enhancing the Catalytic Properties of Mordenites via an Alkali–Acid Treatment and by Loading Nickel–Cerium during o-Ethyltoluene Isomerization

Cao

Wang

et al. 2021

ACS Omega

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“…In past decades, electrophilic substitution of indoles with carbonyl compounds is usually mediated by Lewis acids or bronsted acids, hetero polyacids, ionic liquids, use of toxic reagents, volatile organic solvents, excess catalyst loading, and use of expensive catalysts are drawbacks of these methods. [14,15] To overcome these problems, in recent years, researchers are striving for developing advanced green chemical methodologies to reduce costs, hazards, waste and energy consumption using ecofriendly reagents, and economical reaction conditions for achieving successful synthetic procedures. [16] There are a wide range of interpretations about the organic practices that are consistent with the objectives of sustainable and green chemistry.…”

Section: Introductionmentioning

confidence: 99%

“…Green chemistry is a transforming technology that provides access to novel techniques and robust catalysts, which enables to enhance conventional methodologies. In past decades, electrophilic substitution of indoles with carbonyl compounds is usually mediated by Lewis acids or bronsted acids, hetero polyacids, ionic liquids, use of toxic reagents, volatile organic solvents, excess catalyst loading, and use of expensive catalysts are drawbacks of these methods . To overcome these problems, in recent years, researchers are striving for developing advanced green chemical methodologies to reduce costs, hazards, waste and energy consumption using ecofriendly reagents, and economical reaction conditions for achieving successful synthetic procedures .…”

Section: Introductionmentioning

confidence: 99%

An effective green and ecofriendly catalyst for synthesis of bis(indolyl)methanes as promising antimicrobial agents

Reddy

Zyryanov

Balakrishna³

et al. 2019

Journal of Heterocyclic Chem

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An effective and suitable meglumine‐catalyzed high‐yielding process was considered and engaged for the synthesis of new bis(indolyl)methanes at ambient temperature under aqueous conditions. The catalytic reaction proceeds very smoothly. Clean reaction, ease of product isolation/purification, easily available reactant and ecofriendly reaction conditions are the notable advantages of the present methodology. All the title compounds were characterized by IR, 1H, 13C NMR, and mass spectra. All the synthesized compounds were tested for antimicrobial activity, and the results indicated that most of the synthesized compounds exhibited excellent activity against the tested microorganisms. In this new series, compound 3l, having nitro substituent on the aromatic ring, showed exceptional potent inhibitory activity against Pseudomonas aeruginosa and Penicillium chrysogenum.

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“…Because of the unique pharmacological activities and the prevalence of indole moiety in many natural products, a great deal of interest has been focused on the development of efficient synthetic protocols for the preparation of bis(indolyl)alkanes. A number of synthetic methods for their preparation have been reported . Among these methods, the acid catalyzed electrophilic addition of indole and carbonyl compounds is one of the most simple and straightforward approaches .…”

Section: Introductionmentioning

confidence: 99%

Benzenesulfonic Acid: A Versatile Catalyst for the Synthesis of Bis(indolyl)methanes as Antioxidants

Simha

Mangali

Gari

et al. 2017

Journal of Heterocyclic Chem

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The reaction of indoles with carbonyl compounds in the presence of 5 mol% benzenesulfonic acid in acetonitrile was performed to synthesize bis(indolyl)methane derivatives adopting conventional and ultrasonication methodologies. The reaction proceeded in shorter reaction time in ultrasonication methodology leading to high yield of the products. All the synthesized compounds were tested for antioxidant activity. Among all the tested compounds, 3k exhibited pronounced antioxidant activity.

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An effective lactic acid-modified Hβ zeolite for synthesis of bis(indolyl)methanes

Cited by 12 publications

References 22 publications

Enhancing the Catalytic Properties of Mordenites via an Alkali–Acid Treatment and by Loading Nickel–Cerium during o-Ethyltoluene Isomerization

Enhancing the Catalytic Properties of Mordenites via an Alkali–Acid Treatment and by Loading Nickel–Cerium during o-Ethyltoluene Isomerization

An effective green and ecofriendly catalyst for synthesis of bis(indolyl)methanes as promising antimicrobial agents

Benzenesulfonic Acid: A Versatile Catalyst for the Synthesis of Bis(indolyl)methanes as Antioxidants

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