Phosphotungstic Acid: An Efficient, Cost-effective and Recyclable Catalyst for the Synthesis of Polysubstituted Quinolines

Dabiri, Minoo; Bashiribod, Sahareh

doi:10.3390/molecules14031126

Cited by 32 publications

(11 citation statements)

References 33 publications

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“…Moreover, it is known that, in neutral and especially acidic aqueous solutions, aluminum tungstate Al 2 (WO 4 ) 3 may give the heteropoly acids and polyoxometalate anions. 43 44 which might also contribute to expanding the material inside the rods.…”

Section: Mechanism Of Lm Growthmentioning

confidence: 99%

Metal-substrate-supported tungsten-oxide nanoarrays via porous-alumina-assisted anodization: from nanocolumns to nanocapsules and nanotubes

et al. 2016

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An array of highly aligned tungsten-oxide (TO) nanorods, $80 nm wide, up to 900 nm long, spatially separated at their bottoms by tungsten metal on a substrate is synthesized via the self-localized anodization of aluminum followed by the porous-alumina-assisted re-anodization of tungsten in a sputter-deposited Al/W bilayer. Moreover, the pore-directed TO nanocapsules may grow, which can be electrochemically top-opened in alumina nanopores and transformed to TO nanotubes, representing unique architectures built up on tungsten substrates to date. The as-grown nanorods are composed of amorphous WO 3 mixed with minor amounts of WO 2 and Al 2 O 3 in the outer layer and oxide-hydroxide, mainly present inside the rods. Once the growing oxide fills up the pores, it comes out as an array of exotic protuberances of highly hydrated TO, with no analogues among the other valve-metal oxides. Vacuum or air annealing at 550 C increases the portion of non-stoichiometric oxides 'doped' with OH-groups and gives monoclinic WO 2.9 or a mixture of WO 3 and WO 2.9 nanocrystalline phases, respectively. The nanorods show n-type semiconductor behavior when examined by Mott-Schottky analysis, with a high carrier density of 7 Â 10 19 or 3 Â 10 19 cm À3 for the air-or vacuum-annealed samples, associated with a charge depletion layer of about 8 or 10 nm, respectively. A model for the growth of the metal-substrate-separated TO nanocapsules and tubes is proposed and experimentally justified. The findings suggest that the new TO nanoarrays with well-defined nano-channels for carriers may form the basic elements for photoanodes or emerging 3-D micro-and nano-sensors. † Electronic supplementary information (ESI) available: Details of Mott-Schottky measurements, XRD peak quantitative analysis, structural data used from the ICSD database, rened cell parameters, crystallite size, microstrain, preferred orientation correction, and calculated wt% for each phase. See Fig. 10 (a-d) and (f) SEM images showing the growth of TO protuberances over the general surface of the alumina film and the results of their XPS surface analysis: (e) W 4f and (g) Al 2p/W 5s core-level XP surface spectra of a TO protuberance sample as imaged in (d) and (f).This journal is

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Section: Mechanism Of Lm Growthmentioning

confidence: 99%

Metal-substrate-supported tungsten-oxide nanoarrays via porous-alumina-assisted anodization: from nanocolumns to nanocapsules and nanotubes

et al. 2016

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“…[35] 3 PMA-SiO 2 EtOH, reflux, 8 h 88 [36] 4 Zr(DS) 4 H 2 O, reflux, 6 h 90 [37] 5 Zr(HSO 4 ) 4 H 2 O, reflux, 13 h 87 [38] 6 CH 3 COOH (1 eq.) H 2 O, 60°C, 6 h 60 [39] 7 p-TsOH (1 eq.) H 2 O, 60°C, 6 h 62 [39] 8 bmimCl-ZnCl 2 Ionic liquid, r.t., 24 h 80 [40] 9 H 3 PO 4 (1 eq.)…”

Section: General Procedures For Preparation Of Quinoline Derivativesmentioning

confidence: 99%

“…H 2 O, 60°C, 6 h 60 [39] 7 p-TsOH (1 eq.) H 2 O, 60°C, 6 h 62 [39] 8 bmimCl-ZnCl 2 Ionic liquid, r.t., 24 h 80 [40] 9 H 3 PO 4 (1 eq.) H 2 O, 60°C, 12 h 90 [39] 10 HCl H 2 O, 100-200°C, 1 h 68 [41] Figure 14.…”

Section: General Procedures For Preparation Of Quinoline Derivativesmentioning

confidence: 99%

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A green biosynthesis of NiO nanoparticles using aqueous extract of Tamarix serotina and their characterization and application

Nasseri

Ahrari

Zakerinasab

2016

Applied Organom Chemis

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Nickel oxide nanoparticles were prepared using nickel nitrate as precursor with extract of Tamarix serotina flowers and were characterized using powder X‐ray diffraction, infrared and UV spectroscopies, transmission electron microscopy, vibrating sample magnetometry and BET surface area measurements. Also, the nickel oxide nanoparticles were used as a green and recyclable nanocatalyst for the synthesis of quinoline derivatives. The products are obtained in good to high yields (60–90%) from a one‐pot reaction of 2‐aminobenzophenone and various carbonyl compounds. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Many efforts have been made by the chemists as well as the chemical industries over past two decades to avoid risk during the synthesis of organic compounds either at the pilot scale or the industry level. Significant use of various chemicals during the process of synthesis in order to reduce environmental pollution is designated as a green chemistry approach [1]. In recent years, researchers have been constantly trying to find new eco-friendly green solid catalysts for various organic transformation reactions [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Efficient Catalytic Performance of Calcined Tungstophosphoric Acid for the Claisen-Schmidt Condensation under Solvent-Free Reaction

Alharthi

2019

Asian J. Chem.

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Effect of calcination of tungstophosphoric acid catalyst was evaluated in terms of the synthesis of chalcone derivatives via Claisen-Schmidt condensation using the reaction of acetophenone and several substituted aldehydes. The catalyst was characterized before and after calcination by FT-IR to assess the effectiveness of the synthesis of the desired products. The calcined tungstophosphoric acid catalyst (HPW-CL) showed a better performance and high yield of Claisen-Schmidt products in a short period of time. It was also found out that the calcined tungstophosphoric acid provides a chemo selective, efficient and environmentally benign synthesis of chalcone in an excellent yield in a solvent-free system.

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Phosphotungstic Acid: An Efficient, Cost-effective and Recyclable Catalyst for the Synthesis of Polysubstituted Quinolines

Abstract: Phosphotungstic acid (H3PW12O40) was used as an efficient and recyclable catalyst for the synthesis of polysubstituted quinolines through the Friedländer condensation of 2-aminoarylketone with carbonyl compounds, which was achieved by conventional heating under solvent-free conditions.

Cited by 32 publications

References 33 publications

Metal-substrate-supported tungsten-oxide nanoarrays via porous-alumina-assisted anodization: from nanocolumns to nanocapsules and nanotubes

Metal-substrate-supported tungsten-oxide nanoarrays via porous-alumina-assisted anodization: from nanocolumns to nanocapsules and nanotubes

A green biosynthesis of NiO nanoparticles using aqueous extract of Tamarix serotina and their characterization and application

Efficient Catalytic Performance of Calcined Tungstophosphoric Acid for the Claisen-Schmidt Condensation under Solvent-Free Reaction

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