Heterogenization of heteropoly compounds: a review of their structure and synthesis

Rafiee, Ezzat; Eavani, Sara

doi:10.1039/c6ra04891a

Cited by 89 publications

(63 citation statements)

References 398 publications

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“…The immobilization process is also complicated, time‐consuming and expensive than the homogeneous ones and hence difficult to use it on a large scale . Major problem associated with immobilized catalysts are metal leaching, low turnover numbers and deactivation of catalysts after few recycle runs.…”

Section: Organic Solvent Nanofiltrationmentioning

confidence: 99%

“…Additionally, the synthetic procedure for anchored catalysts required specific multistep processes and their subsequent heterogenization is lengthy and time‐consuming and it also increases the cost as compared to the homogeneous ones. Importantly, due to the low TON, lower reaction rates and lower selectivity of such anchored heterogenized homogeneous catalysts lacks the industrial interest .…”

Section: Development and Stability Of Recoverable Homogeneous Catalystsmentioning

confidence: 99%

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Recent Advances Utilized in the Recycling of Homogeneous Catalysis

Shende

Saptal

Bhanage

2019

The Chemical Record

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Homogeneous catalysts often show high activity and selectivity towards the various chemical transformations. Most of the transition metal‐based active catalysts are expensive, rare, and have strict regulations for their use in pharmaceutical products. Hence, there is a requirement to develop suitable technologies for the practical separation and recycling of metal complex catalysts along with the sustainability of the process. This review focuses on the recent techniques used for the catalyst separation, their recovery, and recyclability of the homogeneous form of catalysts based on their economic compatibility and industrial applications. Various homogeneous catalysts have been reviewed on the basis of their support or media, active centres and recyclability aspects of the catalysts. This review gives brief insights into the varied examples of different recycling techniques utilized in the past 6–7 years.

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Section: Organic Solvent Nanofiltrationmentioning

confidence: 99%

Section: Development and Stability Of Recoverable Homogeneous Catalystsmentioning

confidence: 99%

Recent Advances Utilized in the Recycling of Homogeneous Catalysis

Shende

Saptal

Bhanage

2019

The Chemical Record

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“…Der Einsatz heterogener Substrate für die elektrostatische Immobilisierung von POMs kann als herausragendes Hilfsmittel für technologisch wichtige Komposite genutzt werden . Dieses Verfahren ist insbesondere wichtig, wenn das kationische Substrat und das POM‐Anion synergistische Reaktivitäten aufweisen, die zu multifunktionalen Materialien führen.…”

Section: Neue Felder Und Perspektivenunclassified

Jenseits von Ladungsausgleich: Gegenkationen in der Polyoxometallat‐Chemie

et al. 2019

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Polyoxometallate (POMs) sind molekulare Metalloxidanionen, die Anwendung in Energiewandlung und ‐speicherung, biomolekularer Chemie sowie Materialdesign und ‐integration finden. Das Wechselspiel von intrinsisch anionischen POMs mit organischen oder anorganischen Gegenionen wird häufig übersehen, ist jedoch essenziell, um die Aggregation, Stabilisierung, Löslichkeit und Funktion von POMs zu verstehen. Jenseits von einfachen Alkalimetall‐ oder Ammoniumkationen können neuartige Anwendungen durch vielseitige Kationen wie Dendrimere, mehrwertige Metallkationen, Metallkomplexe, Amphiphile oder Alkaloidkationen erzielt werden. Dieser Aufsatz gibt einen Überblick über grundlegende POM‐Kation‐Wechselwirkungen in Lösung, die daraus resultierenden Festkörperstrukturen und bespricht neuartige Reaktivitäten und Eigenschaften, die aus diesen Wechselwrkungen resultieren. Wir untersuchen, wie anwendungsnahe Forschung das Kation‐kontrollierte Design neuartiger POM‐Materialien ermöglicht hat, was wiederum den Wunsch nach der Aufklärung der Grundlagen von POM‐Kation‐Wechselwirkungen angeregt hat.

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“…If a certain POM acts as a heterogeneous catalyst which is separated easily, it can be recovered and reused several times with no significant change in its activity. Such qualities are among those of green chemistry principles . One of the most promising approaches for the heterogenization of POMs is exchanging their protons with suitable metal cations .…”

Section: Introductionmentioning

confidence: 99%

Ag₃[PMo₁₂O₄₀]: An efficient and green catalyst for the synthesis of highly functionalized pyran‐annulated heterocycles via multicomponent reaction

Tamimi

Heravi

Mirzaei

et al. 2019

Applied Organom Chemis

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A facile, efficient and eco‐friendly catalytic protocol was developed for the synthesis of medicinally important pyran‐annulated heterocycles via multicomponent reaction (MCR). Cyclocondensation of differently substituted aromatic aldehydes, malononitrile/ethyl cyanoacetate and various β‐dicarbonyl compounds in the presence of Ag3[PMo12O40]⋅nH2O as heterogeneous catalyst, in EtOH–H2O, afforded diverse pyran‐fused chromene analogues. The merits observed for this approach were it being conducted via MCR, using commercially available or easily accessible starting materials in the presence of a green and easily separable heterogeneous and reusable catalyst, and affording high yields of desired products in very short reaction times with high purity in one‐pot fashion, thus providing a superior alternative approach for the synthesis of pyran‐annulated heterocycles.

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Heterogenization of heteropoly compounds: a review of their structure and synthesis

Abstract: The heterogenization of different types of heteropoly compoundsviasix popular methods from those published over the past recent 15 years is reviewed.

Cited by 89 publications

References 398 publications

Recent Advances Utilized in the Recycling of Homogeneous Catalysis

Recent Advances Utilized in the Recycling of Homogeneous Catalysis

Jenseits von Ladungsausgleich: Gegenkationen in der Polyoxometallat‐Chemie

Ag₃[PMo₁₂O₄₀]: An efficient and green catalyst for the synthesis of highly functionalized pyran‐annulated heterocycles via multicomponent reaction

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Heterogenization of heteropoly compounds: a review of their structure and synthesis

Abstract: The heterogenization of different types of heteropoly compoundsviasix popular methods from those published over the past recent 15 years is reviewed.

Cited by 89 publications

References 398 publications

Recent Advances Utilized in the Recycling of Homogeneous Catalysis

Recent Advances Utilized in the Recycling of Homogeneous Catalysis

Jenseits von Ladungsausgleich: Gegenkationen in der Polyoxometallat‐Chemie

Ag3[PMo12O40]: An efficient and green catalyst for the synthesis of highly functionalized pyran‐annulated heterocycles via multicomponent reaction

Contact Info

Product

Resources

About

Ag₃[PMo₁₂O₄₀]: An efficient and green catalyst for the synthesis of highly functionalized pyran‐annulated heterocycles via multicomponent reaction