scholarly journals CES as an Efficient Natural Catalyst for Synthesis of Schiff Bases under Solvent-Free Conditions: An Innovative Green Approach

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Suresh Patil ◽  
S. D. Jadhav ◽  
S. K. Shinde
Keyword(s):  
Aromatic Amines ◽  
Condensation Reaction ◽  
Reaction Times ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Schiff Base Ligands ◽  
Green Approach ◽  
Good Product ◽  
Economic Method ◽  
Solvent Free Conditions

A mild and efficient method has been reported for the preparation of Schiff base ligands through the condensation reaction of various aromatic aldehydes with substituted aromatic amines in the presence of CES (calcined eggshell) as a heterogeneous catalyst under solvent-free conditions. The advantages of this ecofriendly, economic method are simplicity of the reaction procedure, moderate to good product yields, and very short reaction times.

A green approach for an efficient preparation of 2,4-diamino-6-aryl-5-pyrimidinecarbonitriles using a TiO2–SiO2 nanocomposite catalyst under solvent-free conditions

2017 ◽  
Vol 72 (4) ◽  
pp. 241-247 ◽  
Author(s):  
Ahmad Rabiei ◽  
Shahrzad Abdolmohammadi ◽  
Faezeh Shafaei
Keyword(s):  
Low Cost ◽  
Condensation Reaction ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Molar Ratio ◽  
Reusable Catalyst ◽  
Green Approach ◽  
Solvent Free Conditions ◽  
Guanidine Nitrate ◽  
Nanocomposite Catalyst

AbstractWe report on the preparation of a series of 2,4-diamino-6-aryl-5-pyrimidinecarbonitriles, a new efficient protocol, via the condensation reaction of aromatic aldehydes, malononitrile, and guanidine nitrate using a TiO2–SiO2 nanocomposite with a molar ratio of 1:1 as a heterogeneous catalyst. The use of a low-cost and reusable catalyst under mild and solvent-free conditions, and simplicity in operation with easier isolation of the products in high to excellent yields are the main advantages of this highly versatile and eco-friendly protocol.

Chlorosulfonic Acid Supported Piperidine-4-carboxylic Acid (PPCA) Functionalized Fe3O4 Nanoparticles (Fe3O4-PPCA): The Efficient, Green and Reusable Nanocatalyst for the Synthesis of Pyrazolyl Coumarin Derivatives under Solvent-Free Conditions

2019 ◽  
Vol 22 (2) ◽  
pp. 123-128
Author(s):  
Setareh Habibzadeh ◽  
Hassan Ghasemnejad-Bosra ◽  
Mina Haghdadi ◽  
Soheila Heydari-Parastar
Keyword(s):  
Carboxylic Acid ◽  
Fe3o4 Nanoparticles ◽  
High Efficiency ◽  
Reaction Times ◽  
Chlorosulfonic Acid ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Magnetic Nanocatalyst ◽  
One Pot ◽  
Solvent Free Conditions

Background: In this study, we developed a convenient methodology for the synthesis of coumarin linked to pyrazolines and pyrano [2,3-h] coumarins linked to 3-(1,5-diphenyl-4,5- dihydro-1H-pyrazol-3-yl)-chromen-2-one derivatives using Chlorosulfonic acid supported Piperidine-4-carboxylic acid (PPCA) functionalized Fe3O4 nanoparticles (Fe3O4-PPCA) catalyst. Materials and Methods:: Fe3O4-PPCA was investigated as an efficient and magnetically recoverable Nanocatalyst for the one-pot synthesis of substituted coumarins from the reaction of coumarin with a variety of aromatic aldehydes in high to excellent yield at room temperature under solvent-free conditions. The magnetic nanocatalyst can be easily recovered by applying an external magnet device and reused for at least 10 reaction runs without considerable loss of reactivity. Results and Conclusion: The advantages of this protocol are the use of commercially available materials, simple and an inexpensive procedure, easy separation, and an eco-friendly procedure, and it shows good reaction times, good to high yields, inexpensive and practicability procedure, and high efficiency.

A highly efficient and green approach for the synthesis of pyrimido[4,5-b]quinolines using N,N-diethyl-N-sulfoethanaminium chloride

2021 ◽  
Vol 76 (2) ◽  
pp. 85-90
Author(s):  
Abdolkarim Zare ◽  
Manije Dianat
Keyword(s):  
Reaction Times ◽  
Solvent Free ◽  
One Pot ◽  
Catalyst Amount ◽  
Green Protocol ◽  
Highly Efficient ◽  
Green Approach ◽  
Solvent Free Conditions ◽  
The One ◽  
High Yields

Abstract A highly efficient and green protocol for the synthesis of pyrimido[4,5-b]quinolines has been described. The one-pot multicomponent reaction of dimedone with arylaldehydes and 6-amino-1,3-dimethyluracil in the presence of N,N-diethyl-N-sulfoethanaminium chloride ([Et3N–SO3H][Cl]) as an ionic liquid (IL) catalyst under solvent-free conditions afforded the mentioned compounds in high yields and short reaction times. Our protocol is superior to many of the reported protocols in terms of two or more of these factors: the reaction times, yields, conditions (solvent-free versus usage of organic solvents), temperature and catalyst amount.

scholarly journals Barium Dichloride as a Powerful and Inexpensive Catalyst for the Pechmann Condensation without Using Solvent

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Saeed Khodabakhshi
Keyword(s):  
Green Chemistry ◽  
Organic Solvents ◽  
Condensation Reaction ◽  
Reaction Times ◽  
Solvent Free ◽  
Coumarin Derivatives ◽  
Inexpensive Method ◽  
Keto Esters ◽  
Pechmann Condensation ◽  
Solvent Free Conditions

Various coumarin derivatives have been efficiently synthesized via barium dichloride-catalyzed Pechmann condensation reaction of various phenols and β-keto esters under solvent-free conditions. This novel and inexpensive method has advantages such as short reaction times, excellent product yields, and avoidance of organic solvents in agreement with green chemistry principles.

Rapid and Green One-Pot Synthesis of Novel 2-(4-Hydroxy-2-oxo-2H-chromen-3-yl)-2-(arylamino)-1H-indene-1,3(2H)-diones

2021 ◽  
Vol 18 ◽  
Author(s):  
Abolfazl Olyaei ◽  
Zahra Ghahremany ◽  
Madieh Sadeghpour
Keyword(s):  
Aromatic Amines ◽  
Low Cost ◽  
Guanidine Hydrochloride ◽  
Reaction Times ◽  
Solvent Free ◽  
One Pot ◽  
Solvent Free Conditions ◽  
The One ◽  
High Yields ◽  
Work Up

: A green and efficient protocol was developed for the one-pot three-component synthesis of novel 2-(4-hydroxy-2-oxo-2H-chromen-3-yl)-2-(arylamino)-1H-indene-1,3(2H)-dione derivatives by the reaction of 4-hydroxycoumarin, ninhydrin and aromatic amines in the presence of guanidine hydrochloride as an organocatalyst under solvent-free conditions. The present approach offers several advantages such as low cost, simple work-up, short reaction times, chromatography-free purification, high yields and greener conditions.

scholarly journals Microwave Assisted Solvent-Free Synthesis of Some Imine Derivatives

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Yunus Bekdemir ◽  
Kürşat Efil
Keyword(s):  
Microwave Heating ◽  
Aromatic Amines ◽  
Environmentally Friendly ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Molar Ratio ◽  
Microwave Assisted ◽  
Solvent Free Conditions ◽  
Solvent Free Synthesis ◽  
Environmentally Friendly Method

Some imine derivatives (1a–7d) were synthesized using a rapid and an environmentally friendly method with reaction of aromatic aldehydes (a–d) and aromatic amines (1–7) (in 1 : 1 molar ratio) in the presence of β-ethoxyethanol as a wetting reagent (2 drops) under solvent-free conditions using microwave heating.

scholarly journals Simultaneous infrared-ultrasound irradiation in organic synthesis: Acylation of amines, alcohols and amino alcohols

2019 ◽  
Vol 63 (2) ◽  
Author(s):  
Ricardo Alfredo Luna-Mora ◽  
Fernando Ortega-Jiménez ◽  
Hulme Ríos-Guerra ◽  
José Guadalupe García-Estrada ◽  
Francisco Javier Pérez-Flores ◽  
...  
Keyword(s):  
Organic Synthesis ◽  
Aromatic Amines ◽  
Reaction Times ◽  
Ultrasound Irradiation ◽  
Amino Alcohols ◽  
Solvent Free ◽  
Energy Sources ◽  
Solvent Free Conditions ◽  
Ultrasound Energy ◽  
Acylation Reactions

Abstract. The acylation of both aliphatic and aromatic amines, alcohols and amino alcohols by simultaneous infrared-ultrasound irradiation (SIUI) in solvent-free conditions in short reaction times and with good to excellent yields was achieved. The results obtained with SIUI and for thermal, infrared and ultrasound energy sources are compared. This is the first report regarding to the application of SIUI in acylation reactions. Resumen. Se realizó la acilación de aminas, alcoholes y amino alcoholes alifáticos y aromáticos mediante la irradiación simultánea de energía de infrarrojo y de ultrasonido (SIUI), en ausencia de disolventes, en tiempos de reacción cortos y con excelentes rendimientos de reacción. Los resultados obtenidos con SIUI fueron comparados con los obtenidos mediante el empleo de energía térmica, de infrarrojo y de ultrasonido. Este es el primer informe relacionado a la aplicación de SIUI en reacciones de acetilación.    

scholarly journals K2CO3: A Mild and Efficient Catalyst for the Synthesis of Pyran Annulated Heterocyclic Systems by Grinding Method Under Solvent-Free Conditions

2017 ◽  
Vol 25 (2) ◽  
pp. 163-178 ◽  
Author(s):  
Reza Heydari ◽  
Rohollah Rahimi ◽  
Mehrnoosh Kangani ◽  
Afshin Yazdani-Elah-Abadi ◽  
Mojtaba Lashkari
Keyword(s):  
Room Temperature ◽  
Reaction Times ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Synthetic Methods ◽  
One Pot ◽  
Efficient Catalyst ◽  
Grinding Method ◽  
Solvent Free Conditions ◽  
The One

Abstract The potassium carbonate was applied as a green and efficient catalyst for the one-pot synthesis of pyran annulated heterocyclic systems, via the condensation between aromatic aldehydes, malononitrile and dimedone/1-naphtole by a grinding method at room temperature and solvent-free conditions. Short reaction times, environmentally friendly procedure and excellent yields are the main advantages of this procedure which makes it more economic than other environmentally synthetic methods.

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.

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