Synthesis of Fused Azo-linked acridine derivatives using MCM-41/Ag2S-RHA nanocomposite

2021 ◽  
Vol 18 ◽  
Author(s):  
Mohammad Nikpassand ◽  
Leila Zare Fekri ◽  
Afshin Pourahmad ◽  
Zeinab Jafarian
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
High Efficiency ◽  
Reaction Products ◽  
Reaction Conditions ◽  
Acridine Derivatives ◽  
Elemental Analyses ◽  
Ft Ir ◽  
Azo Derivatives ◽  
Mcm 41

Introduction: In this study, the synthesis of azo-linked acridine by the reaction of dimedone and synthesized diazoaryl-(2-amino-5-(phenyl)methanone using Ag2S/RHA-MCM-41nanocomposite is reported. Materials and Methods: The synthesized catalyst was characterized by FT-IR, XRD, and SEM. According to the obtained results, Ag2S/RHA-MCM-41 nanocomposite exhibited high activity in the synthesis of azo-acridine derivatives based on desirable yields and reaction time. Products were prepared in 1.5-2 h and with 88-93% yield. In all the reactions, the catalyst could be easily removed and reused, and its catalytic activity was maintained after five uses and did not decrease significantly. The structures of all newly synthesized products were characterized by spectroscopic spectra (FT-IR, 1H NMR, 13C NMR) and elemental analyses. Results and Discussion: The results of the study showed that ionic liquid [DBU]OAc (entry 8) and MCM-41/Ag2S-RHA nanocomposite (entry 8) possessed better efficiency and shorter time than other reaction conditions. Conclusion: In this study, new azo-linked acridine derivatives were synthesized by the reaction of different azo derivatives and dimedone using MCM-41/Ag2S-RHA nanocomposite, and the reaction products were obtained in 1.5-2 h with an efficiency of 88-93%. The short reaction time and high efficiency of the obtained products indicated the high efficiency of this method. In all the reactions, MCM-41/Ag2S-RHA nanocomposite could be easily removed and reused. Its catalytic activity was maintained in the sample reaction after five runs and did not decrease significantly.

scholarly journals Synthesis of tetrazolo[1,5-a]pyrimidine-6-carbonitriles using HMTA-BAIL@MIL-101(Cr) as a superior heterogeneous catalyst

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mohammad Hossein Abdollahi-Basir ◽  
Boshra Mirhosseini-Eshkevari ◽  
Farzad Zamani ◽  
Mohammad Ali Ghasemzadeh
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Reaction Time ◽  
Metal Organic Framework ◽  
One Pot ◽  
Short Reaction Time ◽  
Three Component Reaction ◽  
Metal Organic ◽  
Ft Ir ◽  
Novel Catalyst

AbstractA one-pot three component reaction of benzaldehydes, 1H-tetrazole-5-amine, and 3-cyanoacetyl indole in the presence of a new hexamethylenetetramine-based ionic liquid/MIL-101(Cr) metal–organic framework as a recyclable catalyst was explored. This novel catalyst, which was fully characterized by XRD, FE-SEM, EDX, FT-IR, TGA, BET, and TEM exhibited outstanding catalytic activity for the preparation of a range of pharmaceutically important tetrazolo[1,5-a]pyrimidine-6-carbonitriles with good to excellent yields in short reaction time.

Catalytic Application of H4SiW12O40/SiO2 in Synthesis of Acetals and Ketals

2011 ◽  
Vol 284-286 ◽  
pp. 2374-2379 ◽  
Author(s):  
Shui Jin Yang ◽  
Yong Kui Huang ◽  
Li Yu
Keyword(s):  
Reaction Time ◽  
High Activity ◽  
Sol Gel ◽  
Reaction Parameters ◽  
Reaction Conditions ◽  
Catalytic Application ◽  
Ft Ir ◽  
Gel Technique ◽  
Catalyst Dosage ◽  
Novel Catalyst

A novel catalyst, H4SiW12O40/SiO2was synthesized by a sol-gel technique, and characterized by FT-IR and XRD. Catalytic application of H4SiW12O40/SiO2for synthesis of acetals and ketals were tested. The variation of different reaction parameters, such as mole ratio of aldehyde/ketone to alcohols, catalyst dosage and reaction time on the yield of acetals and ketals were also studied. The results reveal that the H4SiW12O40/SiO2catalysis generally results in good yields of acetals and ketals under mild reaction conditions and the high activity and stability of the catalyst is well retained on recycling.

Catalytic Synthesis of Benzyl Acetate by Diatomite Supported Waugh-Type (NH4)6[MnMo9O32] •8H2O

2013 ◽  
Vol 483 ◽  
pp. 38-41
Author(s):  
Shu Heng Liu
Keyword(s):  
Acetic Acid ◽  
Catalytic Activity ◽  
Reaction Time ◽  
Catalytic Synthesis ◽  
Orthogonal Test ◽  
Solid Catalyst ◽  
High Catalytic Activity ◽  
Benzyl Acetate ◽  
Reaction Conditions ◽  
Catalyst Dosage

Take Waugh-Type (NH4)6[MnMo9O32] •8H2O absorbed on diatomite and prepared supported solid catalyst. The properties of the catalyst were studied through the synthesis of benzyl acetate. The appropriate reaction conditions were obtained by orthogonal test: mole ratio of acetic acid to benzyl alcohol was 2.5:1.0, the catalyst dosage was 1.6g, the water carrying agent toluene dosage was 2.5ml, reaction time was 150min, esterification yield was 87.4%. The catalyst are high catalytic activity and non- polluting, and could be reused.

Selective aerobic allylic oxidation of α-pinene catalyzed by metalloporphyrins in the absence of solvents and additives

2019 ◽  
Vol 43 (9-10) ◽  
pp. 419-425 ◽  
Author(s):  
Huanhuan Dong ◽  
Shichao Xu ◽  
Jing Wang ◽  
Yuxiang Chen ◽  
Liangwu Bi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Flow Rate ◽  
Catalyst Concentration ◽  
Aerobic Oxidation ◽  
Oxygen Flow Rate ◽  
Oxidation Products ◽  
Allylic Oxidation ◽  
Temperature Reaction ◽  
Reaction Conditions

Selective aerobic oxidation of α-pinene to high-value products is a major challenge in chemistry. Metalloporphyrins are proved to be selective catalysts for aerobic oxidation of simple hydrocarbons. Herein, we extend this method to more complex substrates using metallodeuteroporphyrins as model catalysts. It was found that the oxidation occurs mainly on the C=C and allylic C–H bonds of α-pinene influenced by the reaction temperature, reaction time, catalyst concentration, and oxygen flow rate. Allylic C–H oxidation products are obtained with a maximum selectivity value of 78.4% using the following reaction conditions: 105°C, 7 h, 5 ppm, and 60 mL/min. The influence of the metal nuclei of the metallodeuteroporphyrins on this reaction is also investigated. It was found that metallodeuteroporphyrins with Fe3+ as the metal nucleus exhibit the highest catalytic activity.

Oxidation of Higher Alkanes at Moderate Reaction Conditions with Ozone in Presence of Mesoporous Materials

2008 ◽  
Vol 11 (3) ◽  
Author(s):  
V. S. R. Rajasekhar Pullabhotla ◽  
S. B. Jonnalagadda
Keyword(s):  
Carboxylic Acids ◽  
Mesoporous Materials ◽  
Molecular Sieves ◽  
Mesoporous Molecular Sieves ◽  
Reaction Products ◽  
Reaction Conditions ◽  
Moderate Reaction ◽  
Product Molecule ◽  
Relative Selectivity ◽  
Mcm 41

AbstractThe scope of mesoporous molecular sieves, Al-MCM-41, as catalysts in the ozone initiated fuctionalisation of higher n-alkanes at 20 ± 1 °C and ~1 atm conditions is investigated. Oxygen is introduced into carbonaceous site in the product molecule forming 2-, 3- and 4- keto- isomers as main products and carboxylic acids as minor products. The % conversion, reaction products and selectivity for the catalysed reactions are compared. In presence of catalysts, the relative selectivity towards 4-ketone is increased.

Synthesis of Diethyl Carbonate from Ethyl Carbamate and Ethanol with Acid as Catalyst

2013 ◽  
Vol 821-822 ◽  
pp. 1081-1084 ◽  
Author(s):  
Xian Ye Qin ◽  
Biao Liu ◽  
Bing Han ◽  
Wen Bo Zhao ◽  
Shui Sheng Wu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Ethyl Carbamate ◽  
Diethyl Carbonate ◽  
Bronsted Acid ◽  
Optimal Conditions ◽  
Reaction Conditions ◽  
Brönsted Acid ◽  
Pyrophosphoric Acid

The catalytic activity of many Lewis and Bronsted acid for the synthesis of diethyl carbonate (DEC) from ethyl carbamate (EC) and ethanol was evaluated in a bath reactor. Pyrophosphoric acid (H4P7O2) which showed the best activity was selected to further investigate the effect of reaction conditions, such as reaction temperature, catalyst dose and reaction time, on the yield of DEC. Under the optimal conditions, DEC yield can reach 29.1%.

scholarly journals Catalytic Conversion of Cellulose to 5-hydroxymethylfurfural (5-HMF) Over Nano SO42--ZrO2 /MCM-41 Catalysts

2020 ◽  
Vol 36 (1) ◽  
Author(s):  
Pham Tung Son ◽  
Le Ha Giang ◽  
Nguyen Ba Manh ◽  
Pham Thi Thu Trang ◽  
Vu Quang Loi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Selectivity ◽  
Sol Gel ◽  
Catalyst System ◽  
Hydroxymethyl Furfural ◽  
Structure And Morphology ◽  
Highly Dispersed ◽  
Ft Ir ◽  
Mcm 41 ◽  
Medium Acidity

A zirconium catalyst system supported on MCM-41 (S-Z) with various weight components (4-20 wt.%) Was synthesized by the sol-gel method. Structure and Morphology Catalysts were characterized by X-RD, TEM, BET, FT-IR and TPD-NH3 methods. In this catalyst, ZrO2 is highly dispersed on the surface of MCM-41 capillaries. Catalytic activity and selectivity were evaluated by the effectiveness of mild hydrothermal decomposition of cellulose to 5-hydroxymethyl furfural (5-HMF). The results show that a catalyst with medium acidity exhibits a high selectivity of 5-HMF. Keywords: S-Zr/MCM-41 materials, sol-gel methods, cellulose, 5-HMF.

scholarly journals A Green Synthesis of Polylimonene Using Maghnite-H+, an Exchanged Montmorillonite Clay, as Eco-Catalyst

2019 ◽  
Vol 14 (1) ◽  
pp. 69 ◽  
Author(s):  
Hodhaifa Derdar ◽  
Mohammed Belbachir ◽  
Amine Harrane
Keyword(s):  
Reaction Time ◽  
Green Synthesis ◽  
Exchange Process ◽  
Gel Permeation Chromatography ◽  
Bulk Polymerization ◽  
Montmorillonite Clay ◽  
Scanning Calorimetry ◽  
Reaction Conditions ◽  
Ft Ir ◽  
Optimal Reaction

A new green polymerization technique to synthesis polylimonene (PLM) is carried out in this work. This technique consists of using Maghnite-H+ as eco-catalyst to replace Friedel-Crafts catalysts which are toxics. Maghnite-H+ is a montmorillonite silicate sheet clay which is prepared through a simple exchange process. Polymerization experiments are performed in bulk and in solution using CH2Cl2 as solvent. Effect of reaction time, temperature and amount of catalyst is studied, in order to find the optimal reaction conditions. The polymerization in solution leads to the best yield (48.5%) at -5°C for a reaction time of 6 h but the bulk polymerization, that is performed at 25°C, remains preferred even if the yield is lower (40.3%) in order to respect the principles of a green chemistry which recommend syntheses under mild conditions, without solvents and at room temperature. The structure of the obtained polymer (PLM) is confirmed by FT-IR and Nuclear Magnetic Resonance of proton (1H-NMR). The glass transition temperature (Tg) of the polylimonene is defined using Differential Scanning Calorimetry (DSC) and is between 113°C and 116°C. The molecular weight of the obtained polymer is determined by Gel Permeation Chromatography (GPC) analysis and is about 1360 g/mol. Copyright © 2019 BCREC Group. All rights reservedReceived: 26th May 2018; Revised: 11st September 2018; Accepted: 22nd September 2018; Available online: 25th January 2019; Published regularly: April 2019How to Cite: Derdar, H., Belbachir, M., Harrane, A. (2019). A Green Synthesis of Polylimonene Using Maghnite-H+, an Exchanged Montmorillonite Clay, as Eco-Catalyst. Bulletin of Chemical Reaction Engineering & Catalysis, 14 (1): 69-78 (doi:10.9767/bcrec.14.1.2692.69-78)Permalink/DOI: https://doi.org/10.9767/bcrec.14.1.2692.69-78 

Synthesis of Al-Containing Mesoporous Molecular Sieves and their Catalytic Performance to Isomerization Reaction of Endo-Tetrahydrodicyclo-Pentadiene

2011 ◽  
Vol 233-235 ◽  
pp. 234-237 ◽  
Author(s):  
Sa Liu ◽  
Jian Wei Guo ◽  
Chu Fen Yang ◽  
Long Huan Li ◽  
Yi Hua Cui
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves ◽  
Catalytic Performance ◽  
Mesoporous Molecular Sieves ◽  
Isomerization Reaction ◽  
Inorganic Acid ◽  
Ft Ir ◽  
Desorption Isotherms ◽  
Adsorption Desorption ◽  
Mcm 41

Al-containing mesoporous molecular sieves(Al-MCM-41) were synthesized at ambient temperature. The structures of samples were characterized by XRD, N2-adsorption/desorption isotherms and FT-IR, etc. The evaluation results showed that Al-MCM-41 had higher catalytic activity for isomerization conversion of endo-tetrahydrodicyclo-pentadiene (endo-TCD) into exo-tetrahydrodicyclo-pentadiene (exo-TCD) and adamantane (AdH). Loading inorganic acid on the surface of Al-MCM-41 led increase of its catalytic activity and the yield of adamantane.

scholarly journals Halloysite Nanotubes Modified by Chitosan as an Efficient and Eco-Friendly Heterogeneous Nanocatalyst for the Synthesis of Heterocyclic Compounds

Proceedings ◽  
2019 ◽  
Vol 41 (1) ◽  
pp. 59
Author(s):  
Diana Fallah Jelodar ◽  
Zoleikha Hajizadeh ◽  
Ali Maleki
Keyword(s):  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Heterocyclic Compounds ◽  
High Efficiency ◽  
Halloysite Nanotubes ◽  
Reaction Conditions ◽  
X Ray ◽  
Recoverable Catalyst ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

In this study, halloysite nanotubes (HNTs) are modified by chitosan as a natural cationic amino polysaccharide. Halloysite nanotubes/chitosan (HNTs/Chit) were characterized by Fourier transform infrared (FT-IR) spectroscopy and energy dispersive X-ray (EDX) analysis. Also, its performance as a heterogeneous catalyst was investigated in the synthesis of pyranopyrazole derivatives. Being a reusable and easily recoverable catalyst, eco-friendliness, high efficiency, and mild reaction conditions are some advantages of the present work.

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