scholarly journals Nano-SiO2/DBN: an efficacious and reusable catalyst for one-pot synthesis of tetrahydrobenzo[b]pyran derivatives

BMC Chemistry ◽  
2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Maryam Mehravar ◽  
Bi Bi Fatemeh Mirjalili ◽  
Elaheh Babaei ◽  
Abdolhamid Bamoniri
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Reaction Times ◽  
Reusable Catalyst ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
One Pot ◽  
Short Reaction Time ◽  
X Ray ◽  
High Yields ◽  
Exposed Surface Area

Abstract Background The nano-sized particles enhance the exposed surface area of the active part of the catalyst, thereby increasing the contact between precursors and catalyst considerably. In this study, nano-SiO2/1,5-diazabicyclo[4.3.0]non-5-en was synthesized, characterized and used as a heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyran derivatives. Fourier Transform Infrared Spectroscopy, Field Emission Scanning Electron Microscopy, Brunauer–Emmett–Teller plot, Energy Dispersive X-ray Spectroscopy and Thermo Gravimetric Analysis were used to discern nano-SiO2/1,5-diazabicyclo[4.3.0]non-5-en. Results Tetrahydrobenzo[b]pyrans were synthesized by using nano-SiO2/1,5-diazabicyclo[4.3.0]non-5-en via one-pot three-component condensation of malononitrile, aldehydes and dimedone in H2O/EtOH at 60 °C. The results indicate that tetrahydrobenzo[b]pyrans were synthesized in good to high yields and short reaction times. Conclusions The fundamental privileges of this method are short reaction time, plain procedure, recyclability of catalyst and high yields of products.

scholarly journals Nano-SiO2/DBN: An efficacious and reusable catalyst for one-pot synthesis of tetrahydrobenzo[b]pyran derivatives

2021 ◽  
Author(s):  
Maryam Mehravar ◽  
Bi Bi Fatemeh Mirjalili ◽  
Elaheh Babaei ◽  
Abdolhamid Bamoniri
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Reaction Times ◽  
Reusable Catalyst ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
One Pot ◽  
Short Reaction Time ◽  
X Ray ◽  
High Yields ◽  
Exposed Surface Area

Abstract Background: The nano-sized particles enhance the exposed surface area of the active part of the catalyst, thereby increasing the contact between precursors and catalyst considerably. In this study, nano-SiO2/1,5-diazabicyclo[4.3.0]non-5-en was synthesized, characterized and used as a heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyran derivatives. Fourier Transform Infrared Spectroscopy, Field Emission Scanning Electron Microscopy, Brunauer–Emmett–Teller plot, Energy Dispersive X-ray Spectroscopy and Thermo Gravimetric Analysis were used to discern nano- SiO2/1,5-diazabicyclo[4.3.0]non-5-en.Results: Tetrahydrobenzo[b]pyrans were synthesized by using nano- SiO2/1,5-diazabicyclo[4.3.0]non-5-en via one-pot three-component condensation of malononitrile, aldehydes and dimedone in H2O/EtOH at 60 °C. The results indicate that tetrahydrobenzo[b]pyrans were synthesized in good to high yields and short reaction times.Conclusions: The fundamental privileges of this method are short reaction time, plain procedure, recyclability of catalyst and high yields of products.

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.

NiFe2O4@SiO2 nPr@glucose catalyzed synthesis of novel 5-pyrazolin-1,2,4- triazazolidine-3-ones (thiones)

2020 ◽  
Vol 17 ◽  
Author(s):  
Mohammad Nikpassand ◽  
Zahra Pourkarim
Keyword(s):  
Electron Microscope ◽  
Reaction Times ◽  
High Yield ◽  
Reusable Catalyst ◽  
One Pot ◽  
X Ray ◽  
Transmission Electron ◽  
Elemental Analyses ◽  
Ft Ir ◽  
High Yields

Introduction: NiFe2O4@SiO2nPr@glucose catalyzed synthesis of novel 5-pyrazolin-1,2,4-triazazolidine-3- ones (thiones). Materials and Methods: Amino glucose‐ functionalized silica‐ coated NiFe2O4 nanoparticles (NiFe2O4@SiO2 nPr@glucose amine or NiFe2O4@SiP@GA) were synthesized and characterized by X-ray powder diffraction (XRD), X-ray spectroscopy (EDX), transmission electron microscope (TEM), field emission scanning electron microscope (FE-SEM), vibrating sample magnetometry (VSM) and fourier transform infrared spectroscopy (FT-IR). Results and Discussion: NiFe2O4@SiP@GA supply an eco-friendly procedure for the synthesis of some novel 5- pyrazolin-1,2,4-triazazolidine-3-ones or thiones through one-pot reaction of thiosemicarbazide (hydrazinecarbothioamide) and synthetized pyrazole carbaldehydes. These compounds were obtained in high yields in short reaction times. The catalyst could be easily recovered and reused for six cycles with almost consistent activity. The structures of the synthesized 5-pyrazolin-1,2,4-triazazolidine-3-ones or thiones were confirmed by 1H NMR, 13C NMR and FTIR spectral data and elemental analyses. Conclusion: In conclusion, we have investigated NiFe2O4@SiO2nPr@amino glucose as a new, eco-friendly, inexpensive, mild and reusable catalyst for the synthesis of 5-pyrazolin-1,2,4-triazazolidine-3-ones or thiones. High yield, a simple work‐ up procedure, adherence to the basics of green chemistry, environmental friendly and based on natural ingredients, ease of separation and recyclability of the magnetic catalyst and waste reduction are some advantages of this method.

scholarly journals Synthesis of a novel magnetic polyacrylamide coagulant and its application in wastewater purification

2016 ◽  
Vol 75 (3) ◽  
pp. 581-586 ◽  
Author(s):  
Zheng Zhou ◽  
Aiqin Shan ◽  
Yuxia Zhao
Keyword(s):  
Suspended Solids ◽  
Removal Rate ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Wastewater Purification ◽  
Thermo Gravimetric ◽  
Turbidity Removal ◽  
X Ray ◽  
Magnetite Fe3o4

In this study, a novel magnetic polyacrylamide (PAM) coagulant based on the core of magnetite (Fe3O4), with oleic acid serving as modifier and acrylamide as monomer, was synthesized to remove suspended solids in kaolin-suspended water. The composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermo gravimetric analysis and scanning electron microscopy. The results demonstrated that 82.8% of turbidity removal rate was obtained in 5 min of static settling in simulated kaolin-suspended water. This proved to be superior to that of PAM and poly aluminum chloride. Also confirmed in this study was the fact that zeta potential was significantly correlated with turbidity removal.

One-pot synthesis of 2-amino-3-cyano-4-arylsubstituted tetrahydrobenzo[b]pyrans catalysed by silica gel-supported polyphosphoric acid (PPA-SiO2) as an efficient and reusable catalyst

2011 ◽  
Vol 65 (5) ◽  
Author(s):  
Abolghasem Davoodnia ◽  
Sadegh Allameh ◽  
Samineh Fazli ◽  
Niloofar Tavakoli-Hoseini
Keyword(s):  
Reaction Time ◽  
Silica Gel ◽  
Convenient Method ◽  
Polyphosphoric Acid ◽  
Simple Procedure ◽  
Reusable Catalyst ◽  
One Pot ◽  
Short Reaction Time ◽  
Aryl Aldehydes ◽  
High Yields

AbstractA convenient method for the synthesis of tetrahydrobenzo[b]pyrans by a one-pot three-component cyclocondensation of dimedone, aryl aldehydes, and malononitrile in water using silica gel-supported polyphosphoric acid (PPA-SiO2) as an efficient and reusable catalyst is described. The present methodology offers several advantages, such as a simple procedure with ease of handling, short reaction time, high yields, and the absence of any volatile and hazardous organic solvents.

Thermal and Structural of Methyl Cellulose

2014 ◽  
Vol 979 ◽  
pp. 307-310 ◽  
Author(s):  
W. Siriprom ◽  
S. Kongsriprapan ◽  
K. Teanchai
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Thermo Gravimetric Analysis ◽  
Methyl Cellulose ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Biodegradable Film ◽  
Thermo Gravimetric ◽  
X Ray ◽  
The Fourier Transform

The present study aims to investigate the physicochemical properties of the methyl cellulose. The information of this investigate has been used to reference in preparing biodegradable film. It was observed that the Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy show the hydrogen bond’s formation and the Energy Dispersive X-Ray Fluorescence (EDXRF) show the chemical and level of the composition element, which Copper (Cu) has the highest accumulate. Another that, the XRD spectra which investigated by X-Ray Diffraction (XRD) show the methyl cellulose had lowered crystalline. Another that, the Thermo-Gravimetric Analysis (TGA) was used to investigate the effect of heating and influence of thermal.

Thermo Gravimetric Analysis Study of PMMA/TiO2 Nanocomposites

2013 ◽  
Vol 832 ◽  
pp. 816-820
Author(s):  
N.N. Hafizah ◽  
Mohamad Hafiz Mamat ◽  
Mohd Hanafiah Abidin ◽  
Che Mohd Som Said ◽  
Mohamad Rusop
Keyword(s):  
Thermal Decomposition ◽  
Particle Size ◽  
Thermo Gravimetric Analysis ◽  
Polymer Chains ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Analysis Study ◽  
X Ray ◽  
Filler Size

The polymer matrix of poly (metyl methacrylate) (PMMA) has been introduced with the titanium dioxide (TiO2) nanopowder to study the effects of the TiO2size on the properties of the nanocomposites. The particle size is playing an important role in determining the properties of the nanocomposite. The decrease the filler size has increase the thermal decomposition of the nanocomposites due to the higher amount of the filler between the polymer chains. The results of X-ray diffraction (XRD) and Energy Dispersive X-Ray Spectrometry (EDS) also were discussed in this paper.

scholarly journals Fe3o4 nanoparticles: A highly efficient and easily reusable catalyst for the one-pot synthesis of xanthene derivatives under solvent-free conditions

2013 ◽  
Vol 78 (6) ◽  
pp. 769-779 ◽  
Author(s):  
Ali Ghasemzadeh ◽  
Javad Safaei-Ghomi ◽  
Safura Zahedi
Keyword(s):  
Fe3o4 Nanoparticles ◽  
Reaction Times ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
One Pot ◽  
Solvent Free Conditions ◽  
Xanthene Derivatives ◽  
The One ◽  
High Yields

Magnetically separable Fe3O4 nanoparticles supply environmentally friendly procedure for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthene and 1,8-dioxo-octahydro-xanthene derivatives. These compounds were obtained in high yields and short reaction times by the reaction of dimedone and 2-naphthol with various aromatic aldehydes under solvent-free conditions. The catalyst coluld be easily recovered using an external magnet and reused for six cycles with almost consistent activity.

Preparation of α-Al2O3 Powders via Non-Hydrolytic Sol-Gel Method

2015 ◽  
Vol 1104 ◽  
pp. 3-8 ◽  
Author(s):  
Tong Qing Zhou ◽  
Ting Chen ◽  
Wei Hui Jiang ◽  
Jian Min Liu ◽  
Xiao Jun Zhang ◽  
...  
Keyword(s):  
Sol Gel ◽  
Thermo Gravimetric Analysis ◽  
Raw Material ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
X Ray ◽  
Corundum Structure ◽  
Transmission Electron ◽  
Peg 600

Corundum structurealumina (α-Al2O3) powders were prepared via a non-hydrolytic sol-gel (NHSG) method using aluminum as raw material, ethanol as solvent, and iodine as catalyst. X-ray diffraction (XRD), differential thermal analysis (DTA), thermo gravimetric analysis (TG) were used to characterize the crystal phase of the products, while scanning electron microscopy (SEM) and transmission electron microscope (TEM) were employed to analyze the morphology. The results indicated that γ-Al2O3 was completely changed to α-Al2O3 at 1100 o C with a bit of aggregation. When 3 wt.% polyethylene glycol 600 (PEG 600) was introduced on the NHSG process, the dispersion was improved and the particle size decreased to100 nm.

Sign in / Sign up

Export Citation Format

Share Document