Facile synthesis of pyrazole derivatives using reusable Fe3O4@MCM-41-SO3H

2021 ◽  
pp. 1-8
Author(s):  
Samanehsadat Sharifi ◽  
Malek Taher Maghsoudlou ◽  
Nourallah Hazeri
Keyword(s):  
Acid Catalyst ◽  
X Ray Diffraction ◽  
Facile Synthesis ◽  
X Ray ◽  
Solvent Free Conditions ◽  
Lewis Acid Catalyst ◽  
High Yields ◽  
Work Up ◽  
Mcm 41 ◽  
Scanning Electron

In this research, Fe3O4-MCM-41-SO3H was synthesized as a magnetically reusable Lewis acid catalyst and used in the cyclization reaction of 3-acylcoumarins or 3-chromonecarboxylic acid with arylhydrazine derivatives for the synthesis of pyrazoles in high yields under solvent-free conditions and with a simple work-up process. Fe3O4-MCM-41-SO3H was characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analyses.

scholarly journals Rapid four-component synthesis of dihydropyrano[2,3-c]pyrazoles using nano-eggshell/Ti(IV) as a highly compatible natural based catalyst

BMC Chemistry ◽  
2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Arefeh Dehghani Tafti ◽  
Bi Bi Fatemeh Mirjalili ◽  
Abdolhamid Bamoniri ◽  
Naeimeh Salehi
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Reaction Times ◽  
Diffraction Field ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Work Up

AbstractNano-eggshell/Ti(IV) as a novel naturally based catalyst was prepared, characterized and applied for the synthesis of dihydropyrano[2,3-c]pyrazole derivatives. The characterization of nano-eggshell/Ti(IV) was performed using Fourier Transform Infrared spectroscopy, X-ray Diffraction, Field Emission Scanning Electron Microscopy, Energy-Dispersive X-ray Spectroscopy, and Thermo Gravimetric Analysis. Dihydropyrano[2,3-c]pyrazoles were synthesized in the presence of nano-eggshell/Ti(IV) via a four component reaction of aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate at room temperature under solvent free conditions. The principal affairs of this procedure are mild condition, short reaction times, easy work-up, high yields, reusability of the catalyst and the absence of toxic organic solvents.

scholarly journals Rapid Four-component Synthesis of Dihydropyrano[2,3-c]pyrazoles using Nano-egg Shell/Ti(IV) as a Highly Compatible Natural Based Catalyst

2020 ◽  
Author(s):  
Arefeh Dehghani Tafti ◽  
Bi BiFatemeh Mirjalili ◽  
Abdolhamid Bamoniri ◽  
Naeimeh Salehi
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Reaction Times ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solvent Free Conditions ◽  
Ft Ir ◽  
Egg Shell ◽  
High Yields ◽  
Work Up

Abstract Nano-egg shell/Ti(IV) (NEST) as a novel naturally based catalyst was prepared, characterized and applied for the synthesis of dihydropyrano[2,3-c]pyrazole [DHPP] derivatives. The characterization of NEST was performed using Fourier Transform Infrared (FT-IR) spectroscopy, X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy-Dispersive X-ray Spectroscopy (EDX), and Thermo Gravimetric Analysis (TGA). DHPPs were synthesized in the presence of NEST via a four component reaction of aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate at room temperature under solvent free conditions. The principal affairs of this procedure are easy work-up, high yields of pure products without the use of any toxic organic solvents, mild condition and short reaction times.

Facile Synthesis of LnPO4: Tb (Ln = Ce, Gd) Green Emission Phosphors at Specific Temperature (80 or 680°С)

2012 ◽  
Vol 442 ◽  
pp. 3-7
Author(s):  
Qian Ming Wang ◽  
Zheng Yang Zhang ◽  
Yan Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Crystal Growth ◽  
Green Emission ◽  
X Ray Diffraction ◽  
Facile Synthesis ◽  
X Ray ◽  
Specific Temperature ◽  
Temperature Scanning ◽  
Scanning Electron

Cerium and gadolinium phosphate micro-meter size phosphors with average diameters of 20-50 μM were prepared. X-Ray Diffraction (XRD) data confirmed the crystalline phases of samples could be formed at different temperature. Scanning electron microscopy (SEM) investigated the morphology and crystalline of the samples, showing that many regular and large pores (100-200 μM) were dispersed within the micro-meter scale composites. We have proved the above crystal growth structures were controllable and predicable based on the current conditions.

scholarly journals Ceric Ion Loaded MCM-41 Catalyzed Synthesis of Substituted Mono- and Bis-dihydropyrimidin-2(1H)-ones

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Pullar Vadivel ◽  
Rathinam Ramesh ◽  
Appaswami Lalitha
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Aromatic Aldehydes ◽  
One Pot ◽  
Solvent Free Condition ◽  
Three Component Reaction ◽  
High Yields ◽  
Work Up ◽  
Mcm 41

An effective one-pot three-component reaction of aromatic aldehydes with 1,3-diketone and urea or thiourea under solvent-free condition leads to the formation of mono- and bis-dihydropyrimidin-2-(1H)-ones using Ce-MCM-41 as a recyclable solid acid catalyst. This method has several advantages like simple and easy work-up with shorter reaction time, reusability of catalyst, and high yields of Biginelli products.

Green and facile synthesis of nanosized polythiophene as an organic anode for high-performance potassium-ion battery

2018 ◽  
Vol 11 (06) ◽  
pp. 1840003 ◽  
Author(s):  
Guifang Zeng ◽  
Yongling An ◽  
Huifang Fei ◽  
Tian Yuan ◽  
Sun Qing ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Performance ◽  
Reversible Capacity ◽  
Potassium Ion ◽  
X Ray Diffraction ◽  
Excellent Performance ◽  
Facile Synthesis ◽  
X Ray ◽  
Scanning Electron

In this work, nanosized polythiophene (PTh) is synthesized via a green and facile method. The obtained nanosized PTh was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), Brunauer–Emmett–Teller theory (BET) and scanning electron microscopy (SEM). The result indicated that a nanosized, porous and amorphous PTh was synthesized. As an organic anode material for potassium ion battery, the PTh shows excellent performance with a reversible capacity of 58[Formula: see text]mAh[Formula: see text]g[Formula: see text] at 30[Formula: see text]mA[Formula: see text]g[Formula: see text].

scholarly journals Solvent-free synthesis of 1-amidoalkyl-2-naphthol and 3-amino-1-phenyl-1H benzo[f]chromene-2-carbonitrile derivatives by Fe3O4@enamine-B(OSO3H)2 as an efficient and novel heterogeneous magnetic nanostructure catalyst

2020 ◽  
Vol 22 (2) ◽  
pp. 9-19 ◽  
Author(s):  
Fangping Li ◽  
Jun Zhang ◽  
Longjiang Wang ◽  
Weijian Liu ◽  
Qahtan A. Yousif
Keyword(s):  
Reaction Times ◽  
Catalytic Amount ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Magnetic Nanostructure ◽  
The One ◽  
High Yields ◽  
Green Procedure ◽  
Work Up

AbstractA green procedure for the one-pot three-component synthesis of 1-amidoalkyl-2-naphthol and 3-amino-1-phenyl-1H benzo[f]chromene-2-carbonitrile derivatives from the reaction of 2-naphtol, aldehydes, and malononitrile/acetamide in the presence of a catalytic amount of Fe3O4@enamine-B(OSO3H)2 as an efficient and novel heterogeneous magnetic nanostructure catalyst is described. The catalyst was characterized using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), vibrating sample magnetometry (VSM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). These strategies possess some merits such as simple work-up method, easy preparation of the catalyst, short reaction times, good-to-high yields, and non-use of hazardous solvents during all steps of the reactions. Moreover, due to the magnetic nature of the catalyst, it was readily recovered by magnetic decantation and can be recycled at least six runs with no considerable decrease in catalytic activity.

scholarly journals Facile Synthesis of Electroconductive AZO@TiO2Whiskers and Their Application in Textiles

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Hui Ma ◽  
Qiang Gao ◽  
Chunxia Gao ◽  
Wei Bao ◽  
Mingqiao Ge
Keyword(s):  
Electron Microscope ◽  
Photoelectron Spectroscopy ◽  
Crystallographic Structure ◽  
X Ray Diffraction ◽  
Facile Synthesis ◽  
X Ray ◽  
Nonwoven Fabrics ◽  
Doped Zno ◽  
Orthogonal Tests ◽  
Scanning Electron

The electroconductive AZO@TiO2whiskers have been successfully preparedviacoating Al doped ZnO onto TiO2whisker. The orthogonal tests were employed to optimize the synthetic conditions. The crystallographic structure and the morphology of the AZO@TiO2whiskers and the polypropylene nonwoven fabrics modified with AZO@TiO2whiskers were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscope, four-probe meter, and electrometer. The results showed the AZO@TiO2whiskers exhibited good electroconductive performance. Moreover, the polypropylene nonwoven fabrics modified with AZO@TiO2whiskers revealed excellent antistatic performance indicating wide application of AZO@TiO2whiskers in the antistatic textiles.

scholarly journals Study on the preparation of amine-modified silicate MCM-41 adsorbent and its H2S removal performance

2019 ◽  
Vol 45 ◽  
pp. 146867831982590
Author(s):  
Jiaojing Zhang ◽  
Hua Song ◽  
Yanguang Chen ◽  
Tianzhen Hao ◽  
Feng Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Removal Rate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Regeneration Experiment ◽  
Adsorption Desorption ◽  
Mcm 41 ◽  
Scanning Electron

A series of APTMS ((3-aminopropyl)trimethoxysilane)-modified silicate MCM-41 adsorbents ( x-APTMS/MCM-41, x is the volume of APTMS per 1 g of silicate MCM-41) with different APTMS contents was prepared, and the effects of APTMS content on the desulfurization performance of the APTMS/MCM-41 adsorbents were studied in a fixed adsorption bed using H2S and N2 mixture as a model gas. The as-prepared adsorbents were characterized by X-ray diffraction analysis, N2 adsorption–desorption, Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, and energy-dispersive spectroscopy. The results showed that all the APTMS-modified x-APTMS/MCM-41 adsorbents retained the mesoporous silica structure of MCM-41. The Brunauer–Emmett–Teller-specific surface area of x-APTMS/MCM-41 increased slightly with increasing x at first and then decreased with further increasing APTMS content. The H2S removal performances of x-APTMS/MCM-41 adsorbents decreased in the order 0.6-APTMS/MCM-41 > 0.7-APTMS/MCM-41 > 0.5-APTMS/MCM-41 > 0.4-APTMS/MCM-41 > 0.8-APTMS/MCM-41. At x = 0.6, the maximum H2S removal rate of 54.2% and H2S saturated capacity of 134.4 mg g−1 were observed. The regeneration experiment of 0.6-APTMS/MCM-41 adsorbent after three times regeneration at 423 K for 3 h in nitrogen confirmed that it possessed a good regenerability.

Magnetically recyclable silica-coated magnetite-molybdate nanocatalyst and its applications in N-formylation reactions under solvent-free conditions-

2022 ◽  
Vol 19 ◽  
Author(s):  
Runjhun Tandon ◽  
Shripad Patil ◽  
Nitin Tandon ◽  
Pushpendra Kumar
Keyword(s):  
Catalytic Activity ◽  
Solvent Free ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solvent Free Conditions ◽  
Ft Ir ◽  
Co Precipitation ◽  
Coated Nanoparticle ◽  
Scanning Electron

Abstract: A novel magnetite silica-coated nanoparticle-supported molybdate nanocatalyst has been prepared successfully by a simple co-precipitation method. Prepared nanocatalyst has been characterized by different techniques like Fourier Transmission Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FE-SEM) and Energy Dispersive X-ray Spectroscopy (EDX). Further, the catalytic activity of the nanocatalyst was explored for N-formylation reactions under solvent-free conditions. Interestingly, the catalyst could be reused for 10 cycles and only 2 mol % of the catalyst was sufficient to catalyze the N-formylation reaction at 700C under solvent-free conditions.

Tungstate sulfuric acid: preparation, characterization, and application in catalytic synthesis of novel benzimidazoles

2012 ◽  
Vol 66 (7) ◽  
Author(s):  
Bahador Karami ◽  
Saeed Khodabakhshi ◽  
Zahra Haghighijou
Keyword(s):  
Sulfuric Acid ◽  
Ftir Spectroscopy ◽  
Condensation Reaction ◽  
Direct Synthesis ◽  
Catalytic Synthesis ◽  
Solvent Free ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solvent Free Conditions ◽  
Work Up

AbstractTungstate sulfuric acid (TSA) was prepared, characterized, and applied for direct synthesis of novel and known benzimidazoles through a condensation reaction of o-phenylenediamines with orthoesters under solvent-free conditions. TSA was characterized by powdered X-ray diffraction (XRD), X-ray fluorescence (XRF), and FTIR spectroscopy. This novel and eco-friendly method is very cheap and has many advantages such as excellent yields, recyclable and eco-friendly catalyst, and simple work-up procedure.

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