Monodisperse Pt NPs@rGO as highly efficient and reusable heterogeneous catalysts for the synthesis of 5-substituted 1H-tetrazole derivatives

2015 ◽  
Vol 5 (9) ◽  
pp. 4452-4457 ◽  
Author(s):  
İbrahim Esirden ◽  
Esma Erken ◽  
Muharrem Kaya ◽  
Fatih Sen
Keyword(s):  
Reaction Time ◽  
Heterogeneous Catalysts ◽  
Highly Efficient ◽  
Excellent Yield ◽  
Substituted 1 ◽  
Tetrazole Derivatives

Monodisperse Pt NPs@rGO catalyst showed excellent yield and the shortest reaction time for the synthesis of 5-substituted 1H-tetrazoles.

scholarly journals Retraction: Monodisperse Pt NPs@rGO as highly efficient and reusable heterogeneous catalysts for the synthesis of 5-substituted 1H-tetrazole derivatives

2021 ◽  
Author(s):  
İbrahim Esirden ◽  
Muharrem Kaya
Keyword(s):  
Heterogeneous Catalysts ◽  
Highly Efficient ◽  
Substituted 1 ◽  
Tetrazole Derivatives

Retraction of ‘Monodisperse Pt NPs@rGO as highly efficient and reusable heterogeneous catalysts for the synthesis of 5-substituted 1H-tetrazole derivatives’ by İbrahim Esirden et al., Catal. Sci. Technol., 2015, 5, 4452–4457, DOI: 10.1039/C5CY00864F.

scholarly journals InCl3-Catalyzed [2+3] Cycloaddition Reaction: A Rapid Synthesis of 5-Substituted 1H-tetrazole under Microwave Irradiation

2012 ◽  
Vol 9 (3) ◽  
pp. 1145-1152 ◽  
Author(s):  
Vijay S. Patil ◽  
Kamlakar P. Nandre ◽  
Amulrao U. Borse ◽  
Sidhanath V. Bhosale
Keyword(s):  
Reaction Time ◽  
Microwave Irradiation ◽  
Sodium Azide ◽  
Cycloaddition Reaction ◽  
Rapid Synthesis ◽  
Short Reaction Time ◽  
Excellent Yield ◽  
Work Up ◽  
Substituted 1

A series of 5-substituted 1H-tetrazole were efficiently prepared by InCl3catalyzed (10 mol %) from structurally divert organic nitriles with sodium azide under the influence of microwave irradiation. The present protocol was successfully applied to the aliphatic, aryl, benzylic and heterocyclic nitriles and corresponding 5-substituted 1H-tetrazole were obtained in good to excellent yield (70-96%). This method gives remarkable advantages such as short reaction time, simple work-up procedure and economical beneficial.

A rapid and novel method for the synthesis of 5-substituted 1H-tetrazole catalyzed by exceptional reusable monodisperse Pt NPs@AC under the microwave irradiation

RSC Advances ◽  
2015 ◽  
Vol 5 (84) ◽  
pp. 68558-68564 ◽  
Author(s):  
Esma Erken ◽  
İbrahim Esirden ◽  
Muharrem Kaya ◽  
Fatih Sen
Keyword(s):  
Reaction Time ◽  
Microwave Irradiation ◽  
Excellent Yield ◽  
Novel Method ◽  
Substituted 1

Monodisperse Pt NPs@AC catalyst showed excellent yield, one of the shortest reaction time for the synthesis of 5-substituted 1H-tetrazoles under the microwave irradiation.

scholarly journals A Green, Scalable, and Catalyst-Free One-Minute Synthesis of Quinoxalines

SynOpen ◽  
2021 ◽  
Vol 05 (01) ◽  
pp. 43-48
Author(s):  
Jørn H. Hansen ◽  
Vijayaragavan Elumalai
Keyword(s):  
Reaction Time ◽  
Ambient Temperature ◽  
Reaction Conditions ◽  
Dicarbonyl Compounds ◽  
Catalyst Free ◽  
Highly Efficient ◽  
Excellent Yield ◽  
Starting Point ◽  
Cyclocondensation Reaction

AbstractA highly efficient and catalyst-free protocol is reported for the synthesis of quinoxalines via the classical cyclocondensation reaction between aryldiamines and dicarbonyl compounds. Remarkably simple and green reaction conditions employing methanol as solvent afforded medium to excellent yield of quinoxalines after only one-minute reaction time at ambient temperature. The conditions allow at least 10 gram scale synthesis of quinoxalines and should be a preferred starting point for optimization and method of choice for applications in the synthetic community.

Sulfated polyborate: a new and eco-friendly catalyst for one-pot multi-component synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones via Biginelli reaction

2016 ◽  
Vol 40 (12) ◽  
pp. 10412-10417 ◽  
Author(s):  
Chetan K. Khatri ◽  
Deelip S. Rekunge ◽  
Ganesh U. Chaturbhuj
Keyword(s):  
Biginelli Reaction ◽  
Solvent Free ◽  
Synthetic Methodology ◽  
One Pot ◽  
Free Condition ◽  
Sulfated Polyborate ◽  
Highly Efficient ◽  
Excellent Yield ◽  
Solvent Free Condition

A highly efficient and improved synthetic methodology for the preparation of 3,4-dihydropyrimidin-2(1H)-one derivatives in good to excellent yield via Biginelli reaction of β-ketoesters/β-diketone, urea/thiourea and various aldehydes using new, efficient and recyclable sulfated polyborate catalyst under the solvent-free condition is reported.

Production of Biodiesel from Desert Date Seed Oil Using Heterogeneous Catalysts

2021 ◽  
Vol 53 ◽  
pp. 180-189
Author(s):  
Saidat Olanipekun Giwa ◽  
Maku Barbanas Haggai ◽  
Abdulwahab Giwa
Keyword(s):  
Reaction Time ◽  
Alternative Fuels ◽  
Heterogeneous Catalysts ◽  
Raw Materials ◽  
Biodiesel Production ◽  
Local Market ◽  
Flat Bottom ◽  
Optimum Yield ◽  
Animal Fats ◽  
Date Seed

In the recent time, there is increasing research in the area of alternative fuels as the exhausts of presently used petroleum-based fuels have been identified to have negative effects on the environment. Fuels produced from plant oils and animal fats have the tendencies of replacing petro fuels since they are renewable in nature. One of these renewable fuels is biodiesel. However, the homogenous catalyst used in biodiesel production has some drawbacks such as difficulty in separation from the fuel, soap formation and corrosiveness of the product mixture. In this work, the use of heterogeneous catalyst sourced from local raw materials (kaolin and eggshell) for the production of biodiesel from oil of desert date seed has been investigated. The kaolin obtained from Alkaleri Mining Site, Bauchi, was calcined in an oven at 800 °C for 3 h. The calcined kaolin was then chemically activated. Also, the eggshell-based catalyst was produced from raw eggshells after washing, drying, grinding, sieving using 0.3 mm sieve size and calcining at 900 °C for 3 h. Furthermore, the oil content of the desert date seed, which was acquired from a local market in Bauchi, was extracted via solvent extraction in a laboratory with a yield of 42%. Then, the biodiesel was subsequently prepared by mixing the oil, methanol and catalyst in a flat bottom flask and heating the mixture for a specified period. The catalyst concentration, methanol to oil ratio and time of reaction were subsequently varied to obtain the best yield. The results obtained revealed that an optimum yield of 29% could be obtained at methanol to oil ratio of 6:1 and a reaction time of 60 min using 1.5 g of eggshell-based catalyst while an optimum yield of 22% was obtained with 0.6 g for kaolin-based catalyst at a reaction time of 60 min and methanol to oil ratio of 4:1. It is recommended that further work should be carried out to improve on the yield of the biodiesel obtained using the heterogeneous catalysts.

Preformed Au colloidal nanoparticles immobilised on NiO as highly efficient heterogeneous catalysts for reduction of 4-nitrophenol to 4-aminophenol

2019 ◽  
Vol 7 (5) ◽  
pp. 103381 ◽  
Author(s):  
Davide Motta ◽  
Felipe Sanchez ◽  
Khaled Alshammari ◽  
Lidia E. Chinchilla ◽  
Gianluigi A. Botton ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Colloidal Nanoparticles ◽  
Highly Efficient

The Use of Super Base CaO from Eggshells as a Catalyst in the Process of Biodiesel Production

2019 ◽  
Vol 967 ◽  
pp. 150-154 ◽  
Author(s):  
Yoel Pasae ◽  
Lyse Bulo ◽  
Karel Tikupadang ◽  
Titus Tandi Seno
Keyword(s):  
Reaction Time ◽  
Heterogeneous Catalysts ◽  
Ammonium Carbonate ◽  
Raw Materials ◽  
Agricultural Waste ◽  
Acid Number ◽  
Biodiesel Production ◽  
National Standard ◽  
Activation Process ◽  
Biodiesel Quality

The use of heterogeneous catalysts in the biodiesel production process provides advantages because it is easier in the catalyst separation process. One type of heterogeneous catalyst that can be used is CaO. The raw materials for CaO are abundant in nature and can be obtained from various sources including agricultural waste such as eggshells. The alkalinity level of CaO can be increased to super baser CaO through the activation process of CaO by using an ammonium carbonate solution. Super base CaO which is used as a catalyst for transesterification reaction in the production of biodiesel made from palm oil. This research was carried out by varying the reaction time starting from 1, 2 and 3 hours. The highest yield was obtained at 3 hours reaction time of 93.92%. The results of the analysis of the physical properties of biodiesel obtained density in the range 853-854 kg/m3, kinematic viscosity 3.24-3.26 mm2/s (cSt), saponification number 193-201 mg-KOH/g biodiesel and acid number 0.3-0.7 mg-KOH/g. These characteristics meet the biodiesel quality standards based on Indonesian National Standard (SNI) 04-7182-2015. Thus the use of super base CaO from eggshells can be used as a catalyst in the process of biodiesel production.

Sign in / Sign up

Export Citation Format

Share Document