Magnetically recoverable nanoparticles as efficient catalysts for organic transformations in aqueous medium

Cheng, Tanyu; Zhang, Dacheng; Li, Hexing; Liu, Guohua

doi:10.1039/c4gc00458b

Cited by 247 publications

(125 citation statements)

References 232 publications

(198 reference statements)

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“…In this kind of reaction, the catalyst can be separated by filtration. However, it is worthy to mention in spite of several advantages, experienced, practically in using of heterogenous catalysts, due to the nanosized particles used, few limitations to the sustainability are observed [20].To get around these problems, the use of a heterogeneous catalyst which can be separated practically other than filtration is desirable. Magnetite nanoparticles (Fe 3 O 4 ) have attracted much attention in the past decade, due to their unique features, including, low preparation cost, high thermal and mechanical stability, and adaptability for largescale production.…”

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confidence: 98%

Using magnetic nanoparticles Fe3O4 as a reusable catalyst for the synthesis of pyran and pyridine derivatives via one-pot multicomponent reaction

et al. 2015

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In recent years, several methods and developments have been reported for the synthesis of pyran and pyridine [13][14][15][16][17] derivatives; each has its own merits and drawbacks. Many of the standard procedures require long reaction times, harsh reaction conditions, expensive and toxic reagents, solvents, and tedious work-up procedures. Moreover in some cases, a mixture of products is obtained, needing cost-effective column chromatography, naturally resulting in low yields. Heterogeneous catalysis is of supreme importance in many areas of the chemical and energy consuming industries [18,19].Conducting the reactions, using heterogenous catalysts should compensate some of drawbacks observed in previously reported reactions. In this kind of reaction, the catalyst can be separated by filtration. However, it is worthy to mention in spite of several advantages, experienced, practically in using of heterogenous catalysts, due to the nanosized particles used, few limitations to the sustainability are observed [20].To get around these problems, the use of a heterogeneous catalyst which can be separated practically other than filtration is desirable. Magnetite nanoparticles (Fe 3 O 4 ) have attracted much attention in the past decade, due to their unique features, including, low preparation cost, high thermal and mechanical stability, and adaptability for largescale production. In addition, their paramagnetic nature allows their facile and effective separation from the reaction mixture, without using standard filtration, required in separation of heterogeneous catalysts. Magnetite nanoparticles (Fe 3 O 4 ) can be easily separated from reaction mixture by using just an external magnet [21].Thus, in recent years, nano-Fe 3 O 4 [22] has attracted a great attention as heterogeneous catalyst [23] due to its simple handling, easy of recovery with an external magnetic field [24,25]. Magnetic nanoparticles (MNPs) have Abstract An atom-economical, efficient and mild protocol is described for the synthesis of 2-amino-3-cyanopyridine and 2-amino-3-cyano-4H-pyran derivatives in the presence of high surface area Fe 3 O 4 as a highly effective heterogeneous catalyst via one-pot multicomponent cyclocondensation reaction.

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confidence: 98%

Using magnetic nanoparticles Fe3O4 as a reusable catalyst for the synthesis of pyran and pyridine derivatives via one-pot multicomponent reaction

et al. 2015

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“…Hydrogen transfer reactions generally employ precious metal catalysts and the most active are normally homogeneous ones. However, separation and recovery of homogeneous catalysts are always an issue, especially when precious metal catalyst is used [17]. Moreover, specialties are chemicals, whose needs of purity are even more stringent than commodities particularly in the production of pharmaceutics.…”

Section: Introductionmentioning

confidence: 99%

Formates for green catalytic reductions via CO₂ hydrogenation, mediated by magnetically recoverable catalysts

Ronchin

Tortato

Pavanetto

et al. 2017

Pure and Applied Chemistry

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Precious metal catalyst has been prepared by conventional wet impregnation method followed by precipitation and reduction with hydrogen finally passivated with water in air. The magnetically recoverable catalyst has been prepared starting from a stoichiometric Fe 3 O 4 and ZrO 2 -Fe 3 O 4 as supports prepared following a sequential precipitation procedure. Precious metal catalysts supported on carbon, alumina, magnetite and zirconia-magnetite nanocomposite has been used in the reduction of nitrobenzenes and acetophenone by using sodium and potassium formate as reducing agent in the presence and in absence of an aqueous phase. In addition, the same catalysts has been tested in CO 2 and NaHCO 3 hydrogenation, for verifying their potentiality in the CO 2 as hydrogen carrier for hydrogenation processes.

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“…Thus the development of appropriate support materials and highly efficient recycling methods for these types of catalysts is an important task. [34,35] To overcome such kinds of problems, recently nanocatalysts based on magnetic nanoparticles have attracted much attention in organic synthetic transformations. This solves the problem of isolation and recycling as encountered by numerous heterogeneous and homogeneous catalytic systems.…”

Section: Introductionmentioning

confidence: 99%

Co(II) anchored glutaraldehyde crosslinked magnetic chitosan nanoparticles (MCS) for synthesis of 2,4,5‐trisubstituted and 1,2,4,5‐tetrasubstituted imidazoles

Singh

Rajput

2017

Applied Organom Chemis

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A simple, highly efficient and green synthesis of 2,4,5-trisubsituted and 1,2,4,5-tetrasubstituted imidazoles was developed using a novel MCS-GT@Co(II) magnetically recoverable and recyclable catalyst under refluxing conditions with ethanol as a solvent. The catalyst was prepared by immobilization of chitosan onto Fe 3 O 4 using glutaraldehyde as crosslinker followed by Co(II) ion immobilization via cobalt acetate. The catalyst was characterized using various techniques. For organic products determination, 1 H NMR, 13 C NMR and Fourier transform infrared spectroscopies were used. The reaction was also tried with individual components of the catalyst, but the synergistic effect of the components in the prepared catalyst showed the highest yield and shortest reaction time.

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Magnetically recoverable nanoparticles as efficient catalysts for organic transformations in aqueous medium

Abstract: This review focuses on the development of magnetically recoverable nanoparticles as efficient catalysts for organic transformations in aqueous media.

Cited by 247 publications

References 232 publications

Using magnetic nanoparticles Fe3O4 as a reusable catalyst for the synthesis of pyran and pyridine derivatives via one-pot multicomponent reaction

Using magnetic nanoparticles Fe3O4 as a reusable catalyst for the synthesis of pyran and pyridine derivatives via one-pot multicomponent reaction

Formates for green catalytic reductions via CO₂ hydrogenation, mediated by magnetically recoverable catalysts

Co(II) anchored glutaraldehyde crosslinked magnetic chitosan nanoparticles (MCS) for synthesis of 2,4,5‐trisubstituted and 1,2,4,5‐tetrasubstituted imidazoles

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Magnetically recoverable nanoparticles as efficient catalysts for organic transformations in aqueous medium

Abstract: This review focuses on the development of magnetically recoverable nanoparticles as efficient catalysts for organic transformations in aqueous media.

Cited by 247 publications

References 232 publications

Using magnetic nanoparticles Fe3O4 as a reusable catalyst for the synthesis of pyran and pyridine derivatives via one-pot multicomponent reaction

Using magnetic nanoparticles Fe3O4 as a reusable catalyst for the synthesis of pyran and pyridine derivatives via one-pot multicomponent reaction

Formates for green catalytic reductions via CO2 hydrogenation, mediated by magnetically recoverable catalysts

Co(II) anchored glutaraldehyde crosslinked magnetic chitosan nanoparticles (MCS) for synthesis of 2,4,5‐trisubstituted and 1,2,4,5‐tetrasubstituted imidazoles

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Formates for green catalytic reductions via CO₂ hydrogenation, mediated by magnetically recoverable catalysts