Functionalised Chitosan as a Green, Recyclable, Supported Catalyst for the Copper-Catalysed Ullmann C-N Coupling Reaction in Water

A general and effective CuI/N',N'-diaryl-1H-pyrrole-2-carbohydrazide catalyst system was developed for the amination of aryl iodides and bromides at room temperature with good chemoselectivity between -OH and -NH groups. Only 5 mol % of CuI and ligands was needed in this protocol to effect the amination of various aryl bromides and aryl iodides with a wide range of aliphatic and aryl amines (1.3 equiv).

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“…21 139.0, 132.0, 126.4, 125.4, 114.9, 112.6, 55.6. 9, 151.5, 138.5, 136.7, 120.5, 118.8, 116.2, 114.7, 55.7.…”

Section: -Nitromentioning

confidence: 98%

Room-Temperature CuI-Catalyzed Amination of Aryl Iodides and Aryl Bromides

et al. 2017

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“…Various aromatic amines were prepared from substituted aryl halides (electron withdrawing and electron donating), anilines, benzylamine, aliphatic amines and imidazole with good to excellent yields, even for the hindered o‐substituted aryl halides. However, leaching of Cu was observed during recyclability tests . Visualizing all these studies, the potential of chitosan for coupling reactions can be inferred.…”

Section: N‐containing Biopolymers As An Efficient Catalystmentioning

confidence: 89%

“…However, leaching of Cu was observed during recyclability tests. [56] Visualizing all these studies, the potential of chitosan for coupling reactions can be inferred.…”

Section: Coupling Reactionsmentioning

confidence: 99%

Valorization of Oceanic Waste Biomass: A Catalytic Perspective

Lucas

Athawale

Rode

2019

The Chemical Record

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Efficacious waste utilization is vital in context of sustainability. The past decade has witnessed attempts of usage of land biomass and wastes for various applications, contributing towards a sustainable society. Exploitation of the marine biomass, which does not compete with habitation and food production like land biomass has been largely unnoticed and therefore not being utilized judiciously. Researchers have mainly exploited these resources as functional materials having significant potential applications. However, a catalytic perspective for the valorisation of these polymers arising from oceanic waste widens their scope and ameliorates its use. The objective of the present review is to demonstrate the effectiveness of chitin/chitosan as a catalyst and as a feedstock for deriving important fuels and chemicals. It displays all the reactions heterogeneously catalyzed by them along with the strategic methodology. Their important catalytic organic transformations attempted so far, have also been discussed. The future perspectives are also presented which if inculcated would improve the value addition of the waste, paving a way for greener and imperishable world.

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“…The copper is stabilized with different ligands which are finally supported on solid supports. Many types of ligands (including dithioethane, L‐proline, 1,10‐phenanthroline, tris (triazolyl)methanol, and 1 H ‐pyrrole‐2‐carbohydrazide) have been attached on solid materials and applied in laboratory or industrial processes. On the other hand, one of the most important factors must be considered in developing new catalysts is to enhance the capacity of metal absorption of solid supports by using complexation in two or multi‐functionalized ligands as stabilizers .…”

Section: Introductionmentioning

confidence: 99%

Supported benzimidazole‐salen Cu(II) complex: An efficient, versatile and highly reusable nanocatalyst for one‐pot synthesis of hybrid molecules

Sharghi

Aberi

Shiri

2018

Applied Organom Chemis

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A novel and efficient nanocatalyst consisting of benzimidazole‐salen Cu(II) complex on surface‐modified silica (BS‐Cu(II)@SiO2) was prepared. The heterogeneous nanocatalyst was characterized by FESEM, TEM, EDX, FT‐IR, XRD, ICP, and TGA. The nanocatalyst was used for the one‐pot synthesis of some target hybrid molecules. An efficient four component C–H bond activation/[3 + 2] cycloaddition and condensation/cyclization/aromatization sequence toward triazole‐benzimidazole derivatives is disclosed. This methodology provides a general and rapid synthetic route to some new triazole‐benzimidazole hybrids under mild reaction conditions. In addition, the heterogeneous nanocatalyst can be easily separated from the reaction mixture and used several times without noticeable leaching or loss of its catalytic activity. We believe this interesting one‐pot reaction as well as benzimidazole‐salen Cu(II) complex pave the way to the design and synthesis of other new hybrid molecules and metal catalysts, respectively.

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Functionalised Chitosan as a Green, Recyclable, Supported Catalyst for the Copper-Catalysed Ullmann C-N Coupling Reaction in Water

Cited by 55 publications

References 35 publications

Room-Temperature CuI-Catalyzed Amination of Aryl Iodides and Aryl Bromides

Room-Temperature CuI-Catalyzed Amination of Aryl Iodides and Aryl Bromides

Valorization of Oceanic Waste Biomass: A Catalytic Perspective

Supported benzimidazole‐salen Cu(II) complex: An efficient, versatile and highly reusable nanocatalyst for one‐pot synthesis of hybrid molecules

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