851778-79-5Relevant academic research and scientific papers
Nano-ZrO2 sulfuric acid: A heterogeneous solid acid nano catalyst for Biginelli reaction under solvent free conditions
Kolvari, Eskandar,Koukabi, Nadiya,Hosseini, Maliheh M.,Vahidian, Mitra,Ghobadi, Elham
, p. 7419 - 7425 (2016)
Nano-ZrO2 sulfuric acid [n-ZrO2-SO3H (n-ZrSA)] has been synthesized from the reaction of nano-ZrO2 with chlorosulfonic acid as sulfonating agent. This catalyst was characterized via FT-IR, XRD, TGA, FESEM, TEM,
Antidiabetic activity of dihydropyrimidine scaffolds and structural insight by single crystal x-ray studies
Alwassil, Osama I.,Bairagi, Keshab M.,Emeka, Promise Madu,Gonnade, Rajesh G.,Khalil, Hany Ezzat,Nayak, Susanta K.,Sangtani, Ekta,Venugopala, Katharigatta N.,Younis, Nancy Safwat
, p. 996 - 1003 (2020/08/19)
Background: This research project is designed to identify the anti-diabetic effects of the newly synthesized compounds to conclude the perspective of consuming one or more of these new synthetic compounds for diabetes management. Introduction: A series of
A New Type of Magnetically-Recoverable Heteropolyacid Nanocatalyst Supported on Zirconia-Encapsulated Fe3O4 Nanoparticles as a Stable and Strong Solid Acid for Multicomponent Reactions
Zolfagharinia, Somayeh,Kolvari, Eskandar,Koukabi, Nadiya
, p. 1551 - 1566 (2017/05/17)
Abstract: A novel highly efficient magnetically retrievable catalyst was developed by the immobilization of H3PW12O40 (20–60 wt%) on the surface of zirconia-encapsulated Fe3O4 nanoparticles. The prepared HPW supported on nano-Fe3O4@ZrO2 heterogeneous acid catalyst (or n-Fe3O4@ZrO2/HPW) was fully characterized by several physicochemical techniques such as: Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, vibrating sample magnetometry and thermogravimetric analysis. The FT-IR spectroscopic data revealed that H3PW12O40 molecules on the nano-Fe3O4@ZrO2 support existed in the Keggin structure. The acidity of the catalyst was measured by the help of a potentiometric titration with n-butylamine. It was surprising that this very strong solid acid catalyst exhibited an excellent acid strength which was as a result of possessing a higher number of surface active sites compared to its homogeneous analogues. The catalytic activity of the as-prepared novel nano-Fe3O4@ZrO2/HPW was explored through the one-pot three-component synthesis of different 3,4-dihydropyrimidin-2(1H)-ones (i.e. Biginelli reaction) and 1,4-dihydropyridines (i.e. Hantzsh reaction) under solvent free condition. The sample of 40 wt% showed higher acidity and activity in the catalytic transformation. After the reaction, the catalyst/product isolation could be easily achieved with an external magnetic field and the catalyst could be easily recycled for at least five times without any decrease in its high catalytic activity. The excellent recyclability was attributed to the strong interaction between the hydroxyl groups of the nano-Fe3O4@ZrO2 support and the HPW species. Graphical Abstract: [Figure not available: see fulltext.].
A unique opportunity for the utilization of glass wastes as a resource for catalytic applications: toward a cleaner environment
Zolfagharinia, Somayeh,Koukabi, Nadiya,Kolvari, Eskandar
, p. 113844 - 113858 (2016/12/24)
Although glass recycling has been conducted since 1970s, and even though recycled glass waste has been used in the construction of various alternative products, the utilization of glass waste for catalytic applications has not been fully considered until
Zirconia Sulfuric Acid: An Efficient Heterogeneous Catalyst for the One-Pot Synthesis of 3,4-Dihydropyrimidinones Under Solvent-Free Conditions
Hosseini, Maliheh M.,Kolvari, Eskandar,Koukabi, Nadiya,Ziyaei, Maryam,Zolfigol, Mohammad Ali
, p. 1040 - 1049 (2016/06/01)
Abstract: In this article, zirconia sulfuric acid (ZrSA) has been synthesized from the reaction of ZrO2 with chlorosulfonic acid. It was characterized by (FT-IR, XRD, TGA, SEM, EDS, BET, BJH, ICP and pH analysis). This catalyst was employed for
A simple and efficient synthesis of 3,4-dihydropyrimidin-2-(1H)-ones via Biginelli reaction catalyzed by nanomagnetic-supported sulfonic acid
Kolvari, Eskandar,Koukabi, Nadiya,Armandpour, Ozra
supporting information, p. 1383 - 1386 (2014/02/14)
Nanomagnetic-supported sulfonic acid is found to be a new, powerful, and reusable heterogeneous catalyst for the rapid synthesis of 3,4-dihydropyrimidin- 2-(1H)-ones under conventional heating and microwave irradiation. This is the first example of combin
Highly efficient and magnetically recoverable niobium nanocatalyst for the multicomponent biginelli reaction
Lima, Carolina G. S.,Silva, Sandrina,Gonalves, Ricardo H.,Leite, Edson R.,Schwab, Ricardo S.,Corra, Arlene G.,Paixo, Mrcio W.
, p. 3455 - 3463 (2015/04/16)
A new magnetically recoverable nanocatalyst was prepared by coating magnetite with niobium oxide (Fe3O4@Nb2O5) by using a simple wet impregnation method. The Fe3O4@Nb2O5/su
Synthesis and lipase-catalysed enantioselective acylation studies on ethyl 4-aryl-3,4-dihydropyrimidin-2(1H)-ones
Prasad, Ashok K.,Arya, Pragya,Bhatia, Sumati,Sharma, Raman K.,Singh, Rishipal,Singh, Brajendra K.,Van Der Eycken, Erik,Singh, Rajpal,Olsen, Carl E.,Parmar, Virinder S.
experimental part, p. 1738 - 1748 (2011/03/20)
A series of different analogs of 4-aryl-3,4-dihydropynmidin-2(1H)-one have been synthesized and their biocatalytic resolution has been carried out using immobilized lipase CAL-L(A) (immobilized on accurel). The systematic one-step procedure is developed f
