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Highly efficient ring opening reactions of epoxides with deactivated aromatic amines catalyzed by heteropoly acids in water
, Article Tetrahedron ; 2007, Volume 63, Issue 4, Pages 888–891 ; Saidi, M. R ; Sharif University of Technology
Abstract
Heteropoly acid was found to be an effective and efficient catalyst for the ring opening reaction of epoxides with various aromatic amines to produce the corresponding β-amino alcohols in moderate to excellent yields in water. This method provides a new and efficient protocol in terms of mild reaction conditions, clean reaction profiles, small quantity of catalyst, and simple work-up procedure
, M.Sc. Thesis Sharif University of Technology ; Mahmoodi Hashemi, Mohammed (Supervisor) ; Rajab Zade, Ghadir (Supervisor)
Abstract
TiO2/SiO2/HPAsnanocompositeswas prepared by the sol-gel technique at room tempareture and used as the heterogeneous catalysts for the acylation of alcohols employing acetic anhydrid under solvent-free conditions at room tempareture. It was found that the catalytic activity of TiO2/SiO2/HPAs, in all cases of HPAs, was much higher than that of TiO2/SiO2. The most catalytic activity was obtained by TiO2/SiO2/H14NaP5W30O110 which completed the acylation reaction of benzyl alcohol at 1h. Examining the various concentrations of H14NaP5W30O110 in the composite, 9% w/w concentration of TiO2/SiO2/HPAs showed maximum catalytic activity, and by increasing the HPA concentration, activity remains...
Highly efficient synthesis of bis(indolyl)methanes in water
, Article Journal of Molecular Catalysis A: Chemical ; Volume 275, Issue 1-2 , 2007 , Pages 109-112 ; 13811169 (ISSN) ; Torkian, L ; Saidi, M. R ; Sharif University of Technology
2007
Abstract
A simple, atom economy and highly efficient green protocol have been developed for synthesis of bis(indolyl)alkane by the reaction of indole derivatives with aldehydes and ketones in the presence of small amount of the heteropoly acids in water. © 2007 Elsevier B.V. All rights reserved
Highly efficient ring opening reactions of epoxides with deactivated aromatic amines catalyzed by heteropoly acids in water
, Article Tetrahedron ; Volume 63, Issue 4 , 2007 , Pages 888-891 ; 00404020 (ISSN) ; Saidi, M. R ; Sharif University of Technology
2007
Abstract
Heteropoly acid was found to be an effective and efficient catalyst for the ring opening reaction of epoxides with various aromatic amines to produce the corresponding β-amino alcohols in moderate to excellent yields in water. This method provides a new and efficient protocol in terms of mild reaction conditions, clean reaction profiles, small quantity of catalyst, and simple work-up procedure. © 2006
Synthesis of Heteropolyacid Catalysts Stabilized on Clay for Conversion of Carbohyderates into 5-Hydroxymethylfurfural
, M.Sc. Thesis Sharif University of Technology ; Kazemeini, Mohammad (Supervisor) ; Sadjadi, Samaheh (Supervisor)
Abstract
Three Keggin-type heteropolyacids were impregnated upon halloysite to produce heterogeneous acidic catalysts for synthesizing 5-hydroxymethylfurfural (5-HMF). Comparing the effectiveness of variously prepared catalysts in producing 5-HMF from fructose revealed the important role of halloysite in the final catalyst's acidic properties and performance in the reaction of halloysite-supported silicotungstic acid. Adjusting the reaction parameters for obtaining optimal results for the catalyst of choice was conducted via Response Surface Methodology and it was found that use of catalyst with 11 wt.% active ingredient at 125 °C in DMSO solvent yielded the target compound with 99.5% after 43 min....
Reduction of Organic Dyes in Water Using MOFS and Their Composites
, M.Sc. Thesis Sharif University of Technology ; Kazemeini, Mohammad (Supervisor) ; Sadjadi, Samahe (Co-Supervisor) ; Khorasheh, Farhad (Co-Supervisor)
Abstract
A triple photocatalytic composite of biochar, metal-organic framework and phosphomolybdic acid was prepared through solvothermal treatment of iron (III) chloride hexahydrate, terephthalic acid, lavandulifolia-derived biochar and phosphomolybdic acid. The composite was thoroughly characterized and utilized for photodegradation of organic dyes under visible light irradiation. Investigations of reaction variables confirmed that, the highest yield of 96.2% for a cationic Rhodamine-B (RhB) dye was achieved at ambient temperature when using 0.07 g of catalyst at pH of 7 and a dye concentration of 10 ppm. The activity of the composite was superior compared to its individual components implying...