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A simple, economical, and catalyst-free oxidation of thiols to disulfides
, Article Journal of Sulfur Chemistry ; Volume 30, Issue 6 , 2009 , Pages 578-580 ; 17415993 (ISSN) ; Hashemi, M. M ; Sharif University of Technology
Abstract
A simple, rapid, and highly efficient method for the preparation of symmetrical aliphatic, aromatic, and heteroaromatic disulfides is reported. Addition of NBS to an alkyl- or arylthiol under catalyst-free conditions in dichloromethane solution produces the corresponding disulfides in nearly quantitative yields
Simple and highly efficient catalyst- and waste-free ring opening of epoxides with Na2S in water
, Article Monatshefte fur Chemie ; Volume 141, Issue 3 , 2010 , Pages 323-326 ; 00269247 (ISSN) ; Akbari, E ; Ebrahimi, F ; Saidi, M. R ; Sharif University of Technology
2010
Abstract
Water was found to be a highly efficient and green catalyst and solvent for ring-opening reaction of epoxides with Na2S at room temperature to give substituted bis(hydroxyethyl)thioethers in high yields
Catalyst-Free three-component synthesis of spirobenzimidazolidines bearing an indole scaffold
, Article Synlett ; Volume 29, Issue 17 , 2018 , Pages 2301-2305 ; 09365214 (ISSN) ; Moafi, A ; Zamani, Z ; Daneshfar, M ; Sharif University of Technology
Georg Thieme Verlag
2018
Abstract
An efficient catalyst-free one-pot three-component reaction was developed for the synthesis of a new family of N- A nd S-containing spirocyclic compounds. Various derivatives of spirobenzimidazolidine containing an indole scaffold were synthesized for the first time in a modestly toxic solvent and under mild reaction conditions. The reaction times were of the order of several minutes, and all the products were obtained in moderate to high yields (overall yields 58-80%). © Georg Thieme Verlag Stuttgart New York
A facile and convenient synthesis of 3-alkylidene-oxindoles bearing tetrahydropyrazine scaffold under catalyst-free conditions
, Article Heteroatom Chemistry ; Volume 29, Issue 2 , March , 2018 ; 10427163 (ISSN) ; Moafi, A ; Sharif University of Technology
Wiley-Blackwell
2018
Abstract
A facile and efficient synthesis of 2-oxindole derivatives bearing tetrahydropyrazine scaffold has been developed. Using water as solvent without any additional acid or metal catalyst, easy work up and high yield of products are the main advantages of this protocol. © 2018 Wiley Periodicals, Inc
Synthesis and Characterization of some Nitrogen Containing Heterocyclic Compounds Using Synthetic Intermediat of Isatin Analogues
, M.Sc. Thesis Sharif University of Technology ; Matloubi Moghaddam, Firouz (Supervisor)
Abstract
An efficient catalyst-free one-pot three-component reaction was developed for the synthesis of a new family of N- and S-containing spirocyclic compounds.Various derivatives of spirobenzimidazolidine containing an indole scaffold were synthesized for the first time in a modestly toxic solvent and under mild reaction conditions. The reaction times were of the order of several minutes, and all the products were obtained in moderate to high yields (overall yields 58–80%)
Effect of growth conditions on zinc oxide nanowire array synthesized on Si (100) without catalyst
, Article Materials Science in Semiconductor Processing ; Volume 16, Issue 1 , 2013 , Pages 171-178 ; 13698001 (ISSN) ; Dariani, R. S ; Iraji Zad, A ; Sharif University of Technology
2013
Abstract
A uniformly distributed ZnO nanowire array has been grown on silicon (100) substrates by catalyst-free chemical vapor transport and condensation. The effect of growth conditions including source heating temperature, substrate temperature, and gas flow rate on growth properties of ZnO nanowire arrays are studied. Scanning electron microscopy, X-ray diffraction, and room temperature photoluminescence are employed to study the structural features and optical properties of the samples. The results show a correlation among experimental growth parameters. There is a zone for substrate temperature, by controlling gas flow rate, that uniformly distributed and well aligned ZnO nanowire arrays can be...
Bioleaching kinetics of a spent refinery catalyst using Aspergillus niger at optimal conditions
, Article Biochemical Engineering Journal ; Volume 67 , 2012 , Pages 208-217 ; 1369703X (ISSN) ; Mousavi, S. M ; Yaghmaei, S ; Barati, M ; Sharif University of Technology
Elsevier
2012
Abstract
The kinetics of bioleaching of Mo, Ni, and Al from spent hydrocracking catalyst, using Aspergillus niger was studied. The four most effective bioleaching variables were selected in accordance with the Plackett-Burman design and were further optimized via central composite design (CCD). The optimal values of the variables for maximum multi-metal bioleaching were as follows: particle size 150-212. μm, sucrose 93.8. g/L, pulp density 3%. w/v, and pH 7. The maximum metal recoveries corresponding to these conditions were 99.5 ± 0.4% Mo, 45.8 ± 1.2% Ni, and 13.9 ± 0.1% Al. The relatively low Ni extraction was attributed to the precipitation of Ni in the presence of oxalic acid. Under the optimal...