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Nanorod vanadatesulfuric acid (VSA NRs), as a recyclable and eco-benign catalyst, was used for one-pot synthesis of 2,4,5-trisubstituted imidazoles and 1,2,4,5-tetrasubstituted imidazoles using aldehydes, benzil, benzoin or 9,10-phenanthrenequinone and ammonium acetate or aniline under solvent-free conditions providing high to excellent yields. VSA is easily prepared by a simple reaction of chlorosulfonic acid and sodium metavanadate in high purity. As compared with the conventional procedures, the present protocol offers several advantages such as simplicity of procedure, short reaction time, high yields, easy workup, recoverability and reusability of the catalyst and simple purification of the products. 相似文献
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Y. Vahidshad H. Abdizadeh M. Akbari Baseri H. R. Baharvandi 《Journal of Sol-Gel Science and Technology》2010,53(2):263-271
In this research, CuO–ZrO2 nanoparticles are synthesized using microreactors made of surfactant/water/cyclohexane microemulsions. The effect of different
microemulsion variables on the particle size and its distribution, such as water-to-surfactant molar ratio (W
0) and different surfactants are discussed. Three different surfactant types including cationic (CTAB), anionic (AOT), and
nonionic (Brij56) are used. Also a different amount of water to surfactant in nano composite synthesis is used. The powders
were characterized by DTA/TG, XRD, SEM, EDS, TEM and BET techniques and their physical properties are compared. The results
show a decrease of particles size in presence of cationic surfactant. Narrow particles size distribution of the resultant
CuO–ZrO2 nanocomposite in presence of cationic surfactant, anionic and nonionic surfactant is compared. Also for AOT surfactant, by
raising water to surfactant molar ratio the particles size is increased and the optimum ratio is H2O: Surfactant = 0.32:0.055, respectively. 相似文献
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Structural Chemistry - Toxoplasma gondii is an obligate intracellular protozoa that can infect a wide variety of warm-blooded animals and humans. It was claimed that novel anti-Toxoplasma gondii... 相似文献
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Bakhshayesh A. M. Abdizadeh H. Mirhosseini M. Taghavinia N. 《Physics of the Solid State》2020,62(3):529-541
Physics of the Solid State - The present research comes up with optimizing the layers thickness of a Ruddlesden–Popper perovskite with the general formula of... 相似文献
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Structural Chemistry - The authors regret that the Acknowledgments of the original version of this article was incorrect. 相似文献
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Shakeri Amid Abdizadeh Hossein Golobostanfard Mohammad Reza 《Journal of Sol-Gel Science and Technology》2017,81(3):814-823
Journal of Sol-Gel Science and Technology - Lead zirconate titanate is one of the most well-known ferroelectric oxides and has been widely used in nano/micro-electromechanical systems and... 相似文献
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Masoud Nasr-Esfahani Tooba Abdizadeh 《Phosphorus, sulfur, and silicon and the related elements》2013,188(5):596-608
Abstract Vanadatesulfuric acid (VSA), as a novel and heterogeneous catalyst, was used for an efficient synthesis of 3,4-dihydropyrimidin-2(1H)-ones (thiones) using an aldehyde, urea, or thiourea and an acyclic β-dicarbonyl compound under solvent-free conditions. VSA is prepared via the reaction of sodium metavanadate and chlorosulfonic acid in high purity. The catalyst was characterized by FTIR, X-ray diffraction (XRD), and transmission electron microscopy (TEM) analysis. Compared to the classical Biginelli reactions, this method consistently has the advantage of high yields, simple workup, short reaction times, and reusability of the catalyst. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file. 相似文献
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Reza Tayebee Mojtaba Fattahi Abdizadeh Nasrin Erfaninia Amirhassan Amiri Mehdi Baghayeri Roya Mohammadzadeh Kakhki Behrooz Maleki Effat Esmaili 《应用有机金属化学》2019,33(8)
Phosphotungstic acid (H3PW12O40, PTA) supported on ZIF‐9(NH2) was synthesized for the first time and performed as an effective and environmental friendly catalyst in the one‐pot three component Biginelli condensation of different substituted benzaldehydes with ethyl acetoacetate and urea to afford the corresponding 3,4‐dihydropyrimidin‐2‐(1H)‐ones under solvent‐free conditions. ZIF‐9(NH2) and the prepared nanocatalyst PTA@ZIF‐9(NH2) were characterized by XRD, FESEM, TEM, EDX, BET, AAS, TGA, UV–Vis, and FT‐IR. After reaction, the nanocatalyst can be easily separated from the reaction mixture by centrifuge and the recovered catalyst can be reused for at least five times with a 14% reduction in yield after the fifth run. This study showed that ZIF‐9(NH2) can be utilized as a promising support for PTA and developed a highly active, stable and reusable heterogeneous catalyst under easy reaction condition in the multi‐component organic synthesis. 相似文献
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