An insight into the superior performance of ZnO@PEG nanocatalyst for the synthesis of 1,4-dihydropyrano[2,3-c]pyrazoles under ultrasound

Tabassum, Sumaiya; K.R, Sunaja Devi; Govindaraju, Santhosh

doi:10.1016/j.matpr.2020.06.283

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…Recently, ultrasound-mediated syntheses of 1,4-dyhydropyrano/benzo-pyrazole derivatives ( 110 and 11 5 ) have been published ( Scheme 37 ). In this perspective, Tabassum and col. [192] performed the synthesis of 1,4-dyhydropyrano [2,3- c ]pyrazoles ( 1 1 0 ) by means of a MCR with aldehydes ( 1 ), 4-nitrophenylacetonitrile ( 1 0 9 ) and ethyl acetoacetate ( 2 ) using ethanol as solvent and the ZnO@PEG nanocatalyst (0.3 w/w %) ( Scheme 37 ). The reaction was evaluated using reflux for 600 min, microwave irradiation (250 W) for 30 min, and ultrasound (ultrasonic bath operating at 35 kHz and 80 W and r.t.) for 15 min.…”

Section: Ultrasound-assisted Mcrs Under Heterogeneous Catalysismentioning

confidence: 99%

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Greener organic synthetic methods: Sonochemistry and heterogeneous catalysis promoted multicomponent reactions

Machado

Santos

Januario

et al. 2021

Ultrasonics Sonochemistry

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Section: Ultrasound-assisted Mcrs Under Heterogeneous Catalysismentioning

confidence: 99%

“… Entry Catalyst Conditions Examples Yields (%) Ref. 1 ZnO@PEG EtOH, 15 min 15 87–97 [192] 2 β -cyclodextrin H 2 O, 25–70 min 21 84–93 [194] *Ultrasound parameters: Entry 1. Ultrasound bath; frequency: 35 kHz; power: 80 W. Entry 2.…”

Section: Ultrasound-assisted Mcrs Under Heterogeneous Catalysismentioning

confidence: 99%

Greener organic synthetic methods: Sonochemistry and heterogeneous catalysis promoted multicomponent reactions

Machado

Santos

Januario

et al. 2021

Ultrasonics Sonochemistry

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“…Mild reaction conditions, easy workup, high yields, and reusability were the essential advantages of this approach. Tabassum et al [72] synthesised a novel series of pyrano[2,3-c]-pyrazoles (55), applying ZnO@PEG as a nanocatalyst. Various aromatic aldehydes having electron-donating/electronwithdrawing substituents (54) were reacted with ethyl acetoacetate (12), hydrazine hydrate (11), and 4-nitro phenyl acetonitrile (53) in ethanol under ultrasound-assisted conditions, affording excellent 87-97% yields in 15 min (Scheme 14).…”

Section: Single Metal-containing Catalystsmentioning

confidence: 99%

Advances in Pyranopyrazole Scaffolds’ Syntheses Using Sustainable Catalysts—A Review

et al. 2021

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Heterogeneous catalysis plays a crucial role in many chemical processes, including advanced organic preparations and the design and synthesis of new organic moieties. Efficient and sustainable catalysts are vital to ecological and fiscal viability. This is why green multicomponent reaction (MCR) approaches have gained prominence. Owing to a broad range of pharmacological applications, pyranopyrazole syntheses (through the one-pot strategy, employing sustainable heterogeneous catalysts) have received immense attention. This review aimed to emphasise recent developments in synthesising nitrogen-based fused heterocyclic ring frameworks, exploring diverse recyclable catalysts. The article focused on the synthetic protocols used between 2010 and 2020 using different single, bi- and tri-metallic materials and nanocomposites as reusable catalysts. This review designated the catalysts’ efficacy and activity in product yields, reaction time, and reusability. The MCR green methodologies (in conjunction with recyclable catalyst materials) proved eco-friendly and ideal, with a broad scope that could feasibly lead to advancements in organic synthesis.

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“…[40][41][42] With their high surface area and porous structure, activated charcoals provide ample sites for dopant attachment and facilitate effective interaction with the polymer matrix. [40][41][42][43][44][45] Additionally, activated charcoals are readily available and cost-effective, making them attractive for dopant materials in optoelectronic applications. 46 Overall, the functionalization of activated charcoals using TDES and their subsequent incorporation into PVA films represent a promising strategy for achieving semiconducting properties in PVA.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, using activated charcoals as the base material for dopant incorporation plays a crucial role in this process 40–42 . With their high surface area and porous structure, activated charcoals provide ample sites for dopant attachment and facilitate effective interaction with the polymer matrix 40–45 . Additionally, activated charcoals are readily available and cost‐effective, making them attractive for dopant materials in optoelectronic applications 46…”

Section: Introductionmentioning

confidence: 99%

Synergistic fabrication, characterization, and prospective optoelectronic applications of DES grafted activated charcoal dispersed PVA films

Lokesh Kumar,

Binish,

Rajprasad

et al. 2024

Polymers for Advanced Techs

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This study investigates the synthesis, analysis, and utility of films comprising deep eutectic solvent (DES) grafted activated charcoal (AC) within a polyvinyl alcohol (PVA) matrix for optoelectronic device applications. The fabrication process involves the dispersion of DES functionalization AC into the PVA solution, followed by casting onto substrates with controlled drying. Comprehensive characterization encompassing X‐ray diffraction (XRD), scanning electron microscopy (SEM), UV–vis spectroscopy, Fourier‐transform infrared spectroscopy (FTIR), and impedance spectroscopy which discerns the films microstructure, morphology, conductance, band‐gap, and optical traits. The DES grafted AC infusion with variable concentration has significantly influenced optical absorbance and reduced the band gap indicating efficient charge mobility. Furthermore, the impedance analysis has revealed the electrical conduction of the film to be 1.8 × 10−6 Ω−1 m−1. In summary, the dispersion of DES modified AC in the PVA matrix have converted the insulating PVA to a semiconducting polymeric film with reduced band‐gap and increased absorption, which present a propitious avenue for wide array of optoelectronic devices, such as thin film transistors, photovoltaics, LEDs, photodetectors, and many such applications.

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An insight into the superior performance of ZnO@PEG nanocatalyst for the synthesis of 1,4-dihydropyrano[2,3-c]pyrazoles under ultrasound

Cited by 8 publications

References 25 publications

Greener organic synthetic methods: Sonochemistry and heterogeneous catalysis promoted multicomponent reactions

Greener organic synthetic methods: Sonochemistry and heterogeneous catalysis promoted multicomponent reactions

Advances in Pyranopyrazole Scaffolds’ Syntheses Using Sustainable Catalysts—A Review

Synergistic fabrication, characterization, and prospective optoelectronic applications of DES grafted activated charcoal dispersed PVA films

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