Fe3O4@THAM-SO3H: An Eco-Friendly Solid Acid Nanocatalyst for Synthesis of 2-Amino-3-Cyanopyridines and 2,4,6-Triarylpyridines under Mild Reaction Conditions

2022 ◽  
pp. 1-15
Author(s):  
Parvin Roudini ◽  
Nourallah Hazeri ◽  
Homayoun Faroughi Niya ◽  
Maryam Fatahpour
Keyword(s):  
Solid Acid ◽  
Reaction Conditions

scholarly journals Selective synthesis of thioethers in the presence of a transition-metal-free solid Lewis acid

2016 ◽  
Vol 12 ◽  
pp. 2627-2635 ◽  
Author(s):  
Federica Santoro ◽  
Matteo Mariani ◽  
Federica Zaccheria ◽  
Rinaldo Psaro ◽  
Nicoletta Ravasio
Keyword(s):  
Reaction Rate ◽  
Solid Acid ◽  
Amorphous Solid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Alumina Catalyst ◽  
Reaction Conditions ◽  
Solvent Free Conditions ◽  
Wide Range ◽  
Silica Alumina

The synthesis of thioethers starting from alcohols and thiols in the presence of amorphous solid acid catalysts is reported. A silica alumina catalyst with a very low content in alumina gave excellent results in terms of both activity and selectivity also under solvent-free conditions. The reaction rate follows the electron density of the carbinol atom in the substrate alcohol and yields up to 99% and can be obtained for a wide range of substrates under mild reaction conditions.

scholarly journals Efficient N-formylation of primary aromatic amines using novel solid acid magnetic nanocatalyst

RSC Advances ◽  
2020 ◽  
Vol 10 (67) ◽  
pp. 41229-41236
Author(s):  
Jitendra Kumar Yadav ◽  
Priyanka Yadav ◽  
Satish K. Awasthi ◽  
Alka Agarwal
Keyword(s):  
Magnetic Nanoparticles ◽  
Aromatic Amines ◽  
Sulfonic Acid ◽  
Solid Acid ◽  
Recyclable Catalyst ◽  
Primary Amines ◽  
Magnetic Nanocatalyst ◽  
Reaction Conditions ◽  
Primary Aromatic Amines ◽  
First Time

Sulfonic acid functionalized over biguanidine fabricated silica-coated heterogeneous magnetic nanoparticles (NP@SO3H) have been synthesized, well characterized and explored for the first time, as an efficient and recyclable catalyst for N-formylation of primary amines under mild reaction conditions.

Hydrolysis of Cellulose by a Solid Acid Catalyst under Optimal Reaction Conditions

2009 ◽  
Vol 113 (8) ◽  
pp. 3181-3188 ◽  
Author(s):  
Daizo Yamaguchi ◽  
Masaaki Kitano ◽  
Satoshi Suganuma ◽  
Kiyotaka Nakajima ◽  
Hideki Kato ◽  
...  
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Reaction Conditions ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of ◽  
Optimal Reaction

Synthesize Biodiesel through SO42-/ZrO2 for Use as Solid Super Acid Catalyst in Biodiesel Production

2014 ◽  
Vol 919-921 ◽  
pp. 2105-2108 ◽  
Author(s):  
Yan Hua Gao
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Waste Oil ◽  
Reaction Conditions ◽  
Foreign Products ◽  
Super Acid ◽  
Optimal Reaction

This experiment synthesize ​​a rare-SO42-/ZrO2 solid acid catalyst, and investigate the optimal reaction conditions for the catalytic reaction of the catering waste oil and methanol reaction which is preparation for biodiesel. Under a condition of alcohol oil molar ratio of 9:1, a catalyst amount of 4 %, reaction time of 8 h, and reaction temperature of 240°C, more than65% of biodiesel yield was obtained. Each performance index of the Biodiesel can reach the standard of similar foreign products, and the prepared catalyst has good reusability.

scholarly journals Phosphosulfonic acid, an efficient solid acid catalyst for the one-pot preparation of 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo-octahydro-xanthenes under solvent-free conditions

2013 ◽  
Vol 78 (9) ◽  
pp. 1291-1299 ◽  
Author(s):  
Reza Kiasat ◽  
Arash Mouradzadegun ◽  
Jafar Saghanezhad
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Environmentally Benign ◽  
Reaction Conditions ◽  
One Pot ◽  
Aryl Aldehydes ◽  
Solvent Free Conditions ◽  
The One ◽  
High Yields

An expeditious procedure for the synthesis of 14- aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo-octahydro-xanthenes through one-pot pseudo three component condensation of ?-naphthol or dimedone with various aryl aldehydes is described. This greener protocol is catalyzed by phosphosulfonic acid, and proceeds efficiently in the absence of any organic solvent under optimized, mild, green and environmentally benign reaction conditions in high yields within 20-55 minutes.

Effects of acyl donor type, catalyst type, and reaction conditions on the activity and selectivity of Friedel-Crafts acylation

2009 ◽  
Vol 63 (3) ◽  
Author(s):  
Adi Wolfson ◽  
Rao Madhusudhan ◽  
Ayelet Shapira-Tchelet ◽  
Miron Landau
Keyword(s):  
Acetic Anhydride ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Acyl Donor ◽  
Reaction Conditions ◽  
Acidic Catalysts ◽  
Catalyst Type ◽  
Anisole Acylation ◽  
Full Conversion

AbstractAcylation of anisole and 3-methylanisole was performed with several acylating reagents (acetylation by AcCl and Ac2O and bromoacetylation by BrAcCl and (BrAc)2O) over different solid acid catalysts. The reaction conditions were optimized with respect to the acylation reagent, overall yield, solid acid catalyst, and the products selectivities. While acylation of anisole with acetyl chloride or acetic anhydride resulted in its full conversion to para-substituted acetophenone, the use of bromoacetyl bromide or bromoacetic anhydride yielded also the ortho-substituted product. Acylation of 3-methylanisole also yielded both para- and ortho-substitutions, and the products distribution was affected by the reaction conditions and catalyst type. It was found that while more acidic catalysts (caesium salt of heteropolyacid and zeolites) were the most active towards anisole acylation, the most active catalysts for the acylation of 3-methylanisole were ion-exchange catalysts. Employing HY-740 zeolite resulted in the highest ortho-selectivity in the acylation of anisole with bromoacetyl bromide and bromoacetic anhydride and in the acylation of 3-methylanisole with acetic anhydride.

Heteropolymolybdates-Modified Zirconia as a Solid Catalyst for Ring-Open Polymerization of Tetrahydrofuran

2012 ◽  
Vol 550-553 ◽  
pp. 243-247 ◽  
Author(s):  
Yan Xia Shi ◽  
Li Ping Liang ◽  
Yong Xiang Zhao
Keyword(s):  
Solid Acid ◽  
Average Molecular Weight ◽  
Zirconium Hydroxide ◽  
Solid Catalyst ◽  
Acid Catalysts ◽  
Reaction Conditions ◽  
Polymer Yield ◽  
Catalyst Sample ◽  
Saturation Coverage ◽  
Ring Open

Heteropolymolybdates-modified zirconia solid acid catalysts were prepared by dispersing molybdophosphoric acid (MPA) on zirconium hydroxide (ZH) and calcining the MPA/ZH materials at 750 °C. The initial loadings of MPA on ZH were 5-25 wt%. The catalysts were characterized by N2adsorption, XRD, FTIR, Py-IR, and NH3-TPD analysis, and they were used as catalysts for the ring-open polymerization of tetrahydrofuran. The results show that, after calcination at 750 °C, the major molybdenum species are zirconia-anchored polymolybdate surface species and ZrMo2O8. The catalysts show both Brönsted and Lewis acidities, and the catalyst with 15% loading has the highest total acidity and catalytic activity because of the near-saturation coverage of the surface molybdenum species on support. Under the reaction conditions of 40 °C for 20 h, the catalyst sample, 15MPZ-750, gives a high polymer yield of 49% and a desirable number average molecular weight of 2262. A preliminary recycle study indicates a good reusability of these materials.

Influence of reaction conditions on heterogeneous hydrolysis of cellulose over phenolic residue-derived solid acid

Fuel ◽  
2014 ◽  
Vol 134 ◽  
pp. 573-578 ◽  
Author(s):  
Shuguang Shen ◽  
Chunyan Wang ◽  
Yong Han ◽  
Bei Cai ◽  
Huanmei Li
Keyword(s):  
Solid Acid ◽  
Reaction Conditions ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

scholarly journals A review on convenient synthesis of substituted coumarins using reuseable solid acid catalysts

RSC Advances ◽  
2021 ◽  
Vol 11 (47) ◽  
pp. 29130-29155
Author(s):  
Susheel Gulati ◽  
Rajvir Singh ◽  
Suman Sangwan
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Reaction Conditions ◽  
Convenient Synthesis ◽  
Substituted Coumarins

Due to growing concern about chemicals and their impact on the environment, cleaner reaction conditions are needed to be incorporated into chemical synthetic procedures.

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