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Total 81 records

    Nickel (II) and iron (II) / Dowex 50W: An effective catalyst for the Baeyer-Villiger oxidation of ketones using molecular oxygen and benzaldehyde

    , Article Journal of Chemical Research - Part S ; Issue 4 , 2000 , Pages 196-197 ; 03082342 (ISSN) Hashemi, M. M ; Beni, Y. A ; Sharif University of Technology
    Scientific Reviews Ltd  2000
    Abstract
    A mixture of Ni(II) and Fe(II) supported on Dowex 50W catalyses Baeyer- Villiger oxidation of ketones using molecular oxygen and benzaldehyde  

    Facile double Fries rearrangement of diesters under microwave irradiation; application to the synthesis of a biogenetically rare type of natural phenol

    , Article Letters in Organic Chemistry ; Volume 3, Issue 2 , 2006 , Pages 123-127 ; 15701786 (ISSN) Moghaddam, F. M ; Porkaleh, H ; Zali Boeini, H ; Sharif University of Technology
    2006
    Abstract
    Various diesters successfully undergo a double Fries rearrangement to afford the corresponding bis o-hydroxylaryl ketones, in the presence of AlCl3 under microwave irradiation. © 2006 Bentham Science Publishers Ltd  

    ChemInform abstract: microwave-assisted rapid ketalization/acetalization of aromatic aldehydes and ketones in aqueous media [electronic resource]

    , Article Journal of Chemical Research ; September 1999, Volume -, Number 9; Page(s) 562 to 563 Pourdjavadi, A. (Ali) ; Mirjalili, Bibi Fatemeh ; Sharif University of Technology
    Abstract
    Aromatic aldehydes and ketones are readily acetalized or ketalized under microwave irradiation in the presence of water as a solvent  

    BF3.SiO2: An efficient heterogeneous alternative for regio-chemo and stereoselective Claisen-Schmidt condensation

    , Article Journal of the Iranian Chemical Society ; Volume 5, Issue 4 , 2008 , Pages 694-698 ; 1735207X (ISSN) Sadeghi, B ; Mirjalili, B. F ; Hashemi, M. M ; Sharif University of Technology
    Iranian Chemical Society  2008
    Abstract
    Under solvent free conditions between 40-50 °C, BF3.SiO 2, a mild solid acid catalyst, is applied to regio-chemo and stereoselective Claisen-Schmidt condensation. The procedure is very simple and the products are isolated with an easy workup in good to excellent yields  

    The first report on the catalytic oxidation of urazoles to their corresponding triazolinediones via in situ catalytic generation of Br+ using periodic acid or oxone®/KBr system

    , Article Journal of Molecular Catalysis A: Chemical ; Volume 270, Issue 1-2 , 2007 , Pages 219-224 ; 13811169 (ISSN) Zolfigol, M. A ; Bagherzadeh, M ; Mallakpour, S ; Chehardoli, G ; Ghorbani Choghamarani, A ; Koukabi, N ; Dehghanian, M ; Doroudgar, M ; Sharif University of Technology
    2007
    Abstract
    A combination of periodic acid or oxone® and a catalytic amount of KBr in the presence of few drops of water, were used for the catalytic oxidation of urazoles and bis-urazoles to their corresponding triazolinediones under mild and heterogeneous conditions with moderate to excellent yields. © 2007 Elsevier B.V. All rights reserved  

    Stereoselective synthesis of β-amino ketones via direct Mannich-type reactions, catalyzed with ZrOCl2·8H2O under solvent-free conditions

    , Article European Journal of Organic Chemistry ; Issue 22 , 2006 , Pages 5152-5157 ; 1434193X (ISSN) Eftekhari-Sis, B ; Abdollahifar, A ; Mahmoodi Hashemi, M ; Zirak, M ; Sharif University of Technology
    2006
    Abstract
    At room temperature, zirconium oxychloride (ZrOCl2· 8H2O) efficiently catalyzes the direct Mannich-type reaction of a variety of in situ generated aldimines using aldehydes and anilines with ketones in a three-component reaction under solvent-free conditions. The reaction proceeds rapidly and affords the corresponding β-amino ketones in good to high yields with good to excellent stereoselectivities. The catalyst can be recycled for subsequent reactions without any appreciable loss of efficiency. © Wiley-VCH Verlag GmbH & Co. KGaA, 2006  

    Solvent-free three-component condensation reaction of aromatic ketones with aliphatic amines and formaldehyde

    , Article Journal of Chemical Research - Part S ; Issue 8 , 2000 , Pages 380-381 ; 03082342 (ISSN) Mojtahedi, M. M ; Saidi, M. R ; Sharifi, A ; Noushabadi, M ; Bolourtchian, M ; Sharif University of Technology
    Scientific Reviews Ltd  2000
    Abstract
    A solvent-free procedure for the synthesis of several 1-aryl-2-(dialkylaminomethyl)-prop-2-en-1-ones 3 (a-e) and 4 (a-e) is reported. Reaction of arylmethyl ketones with formaldehyde and dialkylamines, such as diethyl- or dibutylamines at room temperature in silica gel produce 3 and 4 with moderate yields  

    Silica-supported DABCO-tribromide: A recoverable reagent for oxidation of alcohols to the corresponding carbonyl compounds

    , Article Scientia Iranica ; Volume 20, Issue 3 , 2013 , Pages 598-602 ; 10263098 (ISSN) Moghaddam, F. M ; Masoud, N ; Foroushani, B. K ; Saryazdi, S ; Ghonouei, N ; Daemi, E ; Sharif University of Technology
    2013
    Abstract
    In this study, 1,4-diazabicy lo[2.2.2] octane (DABCO) tribromide was immobilized on silica support by using 3-chloro propyl trimethoxy silane to obtain a silica-supported DABCO tribromide reagent. The synthesized reagent was characterized with elemental analysis, FT-IR spectroscopy, and thermo-gravimetric analysis (TGA). This reagent has been applied in the conversion of alcohol to corresponding carbonyl compounds. Alcohol oxidation reactions yield in 52-95%, and the reagent may be recycled five times with further bromine treatment  

    Polyaniline membranes for nanofiltration of solvent from dewaxed lube oil

    , Article Separation Science and Technology (Philadelphia) ; 2018 ; 01496395 (ISSN) Monjezi, S ; Soltanieh, M ; Sanford, A. C ; Park, J ; Sharif University of Technology
    Taylor and Francis Inc  2018
    Abstract
    Polyaniline nanofiltration membranes were synthesized to examine a potential candidate for application of solvent recovery from lube oil. An integrally skinned polyaniline membrane was cast on a woven polyester fabric and then was chemically crosslinked with glutaraldehyde in order to further increase the membranes resistant in a methyl ethyl ketone and toluene mixture. Subsequently, membrane performance was tested under different operational conditions. The operation pressure was fixed at 35 bar and was held constant for all of the tests. The membrane demonstrated a permeate flux of 10 l/(m2 h) and oil rejection of 69%. Abbreviations: PANi: Polyaniline; PI: polyimide; MEK: methyl ethyl... 

    Stereoselective synthesis ofβ-Amino ketones via direct mannich-type reaction catalyzed with SO 2- 4/TiO 2 and SO 2- 4/nano TiO 2

    , Article Synthetic Communications ; Volume 39, Issue 24 , 2009 , Pages 4441-4453 ; 00397911 (ISSN) Samet, M ; Eftekhari Sis, B ; Mahmodi Hashemi, M ; Farmad, F ; Sharif University of Technology
    2009
    Abstract
    At room temperature, SO 2- 4/nano-TiO 2 efficiently catalyze the direct Mannich-type reaction of varieties of in situ-generated aldimines using aldehydes and anilines with ketones in a three-component reaction under solvent-free conditions. The reaction proceeds rapidly and affords the correspondingβ-amino ketones in good to high yields with good to excellent stereoselectivity. The catalyst can be recycled for subsequent reactions without any appreciable loss of efficiency  

    Polyaniline membranes for nanofiltration of solvent from dewaxed lube oil

    , Article Separation Science and Technology (Philadelphia) ; Volume 54, Issue 5 , 2019 , Pages 795-802 ; 01496395 (ISSN) Monjezi, S ; Soltanieh, M ; Sanford, A. C ; Park, J ; Sharif University of Technology
    Taylor and Francis Inc  2019
    Abstract
    Polyaniline nanofiltration membranes were synthesized to examine a potential candidate for application of solvent recovery from lube oil. An integrally skinned polyaniline membrane was cast on a woven polyester fabric and then was chemically crosslinked with glutaraldehyde in order to further increase the membranes resistant in a methyl ethyl ketone and toluene mixture. Subsequently, membrane performance was tested under different operational conditions. The operation pressure was fixed at 35 bar and was held constant for all of the tests. The membrane demonstrated a permeate flux of 10 l/(m 2  h) and oil rejection of 69%. Abbreviations: PANi: Polyaniline; PI: polyimide; MEK: methyl ethyl... 

    Efficient Friedel-crafts alkylation of indoles and pyrrole with enones and nitroalkene in water

    , Article Organic and Biomolecular Chemistry ; 2006, Volume 4, Issue 23, Pages 4275-4277 Azizi, N. (Najmodin) ; Arynasab, F ; Saidi, M. R ; Sharif University of Technology
    Abstract
    An operationally simple and entirely green protocol for heteropoly acid catalyst conjugate addition of indoles and pyrrole to unsaturated carbonyl compounds and nitro-alkene in water was investigated. It is important that the products arising from 1,2-addition were not observed under the reaction conditions. Pyrroles also readily underwent Michael addition at Α-positions under the same reaction conditions. Indole and many of its derivatives are present in many substances commonly found in nature. Micheal addition reactions are performed in organic solvents with the reactions in water are relatively scarce. The Michael addition between indole and methyl vinyl ketone in the presence of... 

    ZnO nanoparticles: An efficient nanocatalyst for the synthesis of β-acetamido ketones/esters via a multi-component reaction

    , Article Catalysis Communications ; Volume 9, Issue 2 , 2008 , Pages 299-306 ; 15667367 (ISSN) Mirjafary, Z ; Saeidian, H ; Sadeghi, A ; Matloubi Moghaddam, F ; Sharif University of Technology
    2008
    Abstract
    A convenient one-pot multi-component reaction of aromatic aldehydes, enolizable ketones or β-keto esters and acetonitrile in the presence of acetyl chloride and 10 mol% ZnO nanoparticles for the synthesis of β-acetamido ketones/esters at room temperature is described. © 2007 Elsevier B.V. All rights reserved  

    Efficient method for oxidation of ketones to esters with 4-aminoperoxybenzoic acid supported on silica gel

    , Article Synthetic Communications ; Volume 38, Issue 12 , 2008 , Pages 2037-2042 ; 00397911 (ISSN) Ghazanfari, D ; Hashemi, M. M ; Shahidi Zandi, M ; Sharif University of Technology
    2008
    Abstract
    4-Aminoperoxybenzoic acid supported on silica gel was found to be a versatile and efficient oxidant for the oxidation of ketones to esters. Copyright © Taylor & Francis Group, LLC  

    A high-performance architecture for irregular LDPC decoding algorithm using input-multiplexing method

    , Article 2007 9th International Symposium on Signal Processing and its Applications, ISSPA 2007, Sharjah, 12 February 2007 through 15 February 2007 ; 2007 ; 1424407796 (ISBN); 9781424407798 (ISBN) Sarbishei, O ; Mohtashami, V ; Sharif University of Technology
    2007
    Abstract
    A new high-performance architecture for decoding the irregular Low-Density Parity-Check (LDPC) codes with respect to the iterative message-passing decoding algorithm is explored. The proposed method is based on reducing the logic delays in the iterative processing of the bit nodes and check nodes leading to the increment of maximum possible frequency. The simulations show the efficiency of the proposed method in low/high-complexity graph matrices, though it is more effective in high-complexity ones. About 28% reduction of the combinational delay in the bit/check processors is explored without much impacting the area consumption. ©2007 IEEE  

    Evaluation complexity problem in agent based software development methodology

    , Article ICIIS 2007 - 2nd International Conference on Industrial and Information Systems 2007, Peradeniya, 9 August 2007 through 11 August 2007 ; 2007 , Pages 577-584 ; 1424411521 (ISBN); 9781424411528 (ISBN) Saremi, A ; Esmaeili, M ; Rahnama, M ; Sharif University of Technology
    2007
    Abstract
    Several methodologies with their own characteristics have been proposed in the area of agent-oriented software engineering. Consequently, deciding which methodology to select in a specific case is an important issue and it can lead to decrease software development cost and effort. Thus, importance of evaluation of methodologies will be highlighted in choosing the appropriate methodology in the development process of an application. It can also help in developing new methodologies and improving existing ones. In this paper, we are going to provide an evaluation framework of agent oriented methodologies. To demonstrate the usage of the suggested framework, it is applied to evaluate two... 

    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) Azizi, N ; 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  

    Efficient Friedel-crafts alkylation of indoles and pyrrole with enones and nitroalkene in water

    , Article Organic and Biomolecular Chemistry ; Volume 4, Issue 23 , 2006 , Pages 4275-4277 ; 14770520 (ISSN) Azizi, N ; Arynasab, F ; Saidi, M. R ; Sharif University of Technology
    2006
    Abstract
    An operationally simple and entirely green protocol for heteropoly acid catalyst conjugate addition of indoles and pyrrole to unsaturated carbonyl compounds and nitro-alkene in water was investigated. It is important that the products arising from 1,2-addition were not observed under the reaction conditions. Pyrroles also readily underwent Michael addition at Α-positions under the same reaction conditions. Indole and many of its derivatives are present in many substances commonly found in nature. Micheal addition reactions are performed in organic solvents with the reactions in water are relatively scarce. The Michael addition between indole and methyl vinyl ketone in the presence of... 

    Sodium borohydride-solid LiClO4: An effective reagent for reducing aldehydes and ketones in aprotic solvent

    , Article Synthetic Communications ; Volume 35, Issue 17 , 2005 , Pages 2271-2276 ; 00397911 (ISSN) Halimjani, A. Z ; Saidi, M. R ; Sharif University of Technology
    2005
    Abstract
    An efficient and simple method for the reduction of aldehydes, ketones and acid chlorides has been accomplished by using NaBH4-solid LiClO 4 in mild conditions at ambient temperature with complete chemoselectivity in reduction of α,β-unsaturated aldehydes and ketones. The reaction is fast with high yield and simple workup. Copyright © Taylor & Francis, Inc  

    Synthesis of β-Amino Ketones Using Titania Based on Solid Acid as A Catalyst

    , M.Sc. Thesis Sharif University of Technology Samet, Masoud (Author) ; Mahmoudi Hashemi, Mohammad (Supervisor)
    Abstract
    Enanthioselective synthesis of biological molecules are so important in synthetic chemistry, and because of their biological activities, β-amino carbonyl compounds have earned so much attention in this area of chemistry. Mannich reaction is a classical method for synthesis of these molecules. The Mannich reaction is a three-component reaction between an enolizable CH-acidic carbonyl compound, an amine, and an aldehyde producing β-amino carbonyl compounds. But acidic or basic difficult circumstances, long reaction time, low yield and enantioselectivity, are the drawbacks of classical methods. In this project, we used titania-based solid acid as an enantioselective catalyst to overcome these...