Search for: aromatic-compounds
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    Microwave-assisted aminomethylation of electron-rich compounds under solvent-free condition

    , Article Synthetic Communications ; Volume 30, Issue 1 , 2000 , Pages 69-72 ; 00397911 (ISSN) Mojtahedi, M. M ; Sharifi, A ; Mohsenzadeh, F ; Saidi, M. R ; Sharif University of Technology
    Marcel Dekker Inc  2000
    Electron-rich aromatic compounds react with formaldehyde and a secondary amine under solvent-free condition, in the presence of acidic alumina in a commercial microwave oven or at room temperature to produce aminomethylated products in good to excellent yields  

    Lithium perchlorate assisted one-pot three-component aminoalkylation of electron-rich aromatic compounds

    , Article Tetrahedron Letters ; Volume 42, Issue 45 , 2001 , Pages 8111-8113 ; 00404039 (ISSN) Saidi, M. R ; Azizi, N ; Naimi Jamal, M.Reza ; Sharif University of Technology
    A one-pot, three-component, Mannich reaction of electron-rich aromatic compounds with in situ prepared iminium salts in 5 M ethereal lithium perchlorate gives good yields of aminoalkylated products at room temperature. © 2001 Elsevier Science Ltd. All rights reserved  

    Thesis Title Synthesis and Characterization of Metal Nano Oxids and Investigation of their Catalytic Activity

    , M.Sc. Thesis Sharif University of Technology Falamarzi Askarani, Mehrdad (Author) ; Gholami, Mohammad Reza (Supervisor)
    In this project, the catalytic properties of CuO and ZnO were investigated in reduction reactions.MOFs were used as a precursor to preparation of these metal oxides. Gold and silver nanoparticles were used to improve the catalytic properties of the prepared metal oxides. Structural characteristics of nanocatalysts were stydied by SEM, TEM, XRD and FT-IR techniques. The prepared nanocomposites were applied in the catalytic reduction of paranitrophenol in the presence of sodium borohydride and the kinetics and mechanism were investigated according to the structure of the prepared catalysts  

    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
    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  

    Modified Catalyst Based on Zeolite: Preparation, Characterization and Application as Catalysts for the Isomerization of C8 Aromatics

    , M.Sc. Thesis Sharif University of Technology Yazdani, Saeed (Author) ; Gholami, Mohammad Reza (Supervisor) ; Salari, Hadi (Co-Advisor)
    In this project Mordinate and Eu-1 zeolite were synthesized by hydrothermal method and then bifunctional catalysts including acid-base zeolite and Pt-Al2O3 metal base were mixed and made using a planetary mill. The modified catalysts were detected by various methods such as XRD, SEM, FTIR. The aim of this project is to synthesize and characterize the modified catalysts and to escalate their catalytic properties. Our focus is primarily on the synthesis of zeolite-based catalysts modified with unique features such as having active acid sites, high thermal stability and appropriate selectivity for the purpose of investigating the mechanism and kinetics of the C8 aromatic Compounds... 

    Synthesis Deuterated Aromatic Compunds by Supercritical Method

    , M.Sc. Thesis Sharif University of Technology Shadjirati, Yasamin (Author) ; Outokesh, Mohammad (Supervisor) ; Sajadi, Soudeh (Supervisor)
    Green chemistry seeks to reduce or eliminate the use of hazardous substances in the chemical industry through the development of new products and processes .The replacement of harmful, widely used solvents and reagents is a key part of this approach. Supercritical fluid such as CO2 or water are good solvent for replaceement Exchange reactions involving the displacement of hydrogen bonded to carbon by deuterium are of interest in a broad variety of disciplines, such as the preparative chemistry of isotopically labeled materials, fundamental studies of carbonehydrogen bond activation processes, and studies of the nature of catalysts. The low cost of water and its environmental friendliness... 

    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
    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  

    Zirconium(IV) oxide chloride and anhydrous copper(II) sulfate mediated synthesis of 2-substituted benzothiazoles

    , Article Heteroatom Chemistry ; Volume 17, Issue 2 , 2006 , Pages 136-141 ; 10427163 (ISSN) Matloubi Moghaddam, F ; Ismaili, H ; Rezanejade Bardajee, G ; Sharif University of Technology
    A simple, fast and efficient benign procedure has been developed for one-pot synthesis of 2-substituted benzothiazoles in the presence of zirconium(IV) oxide chloride octahydrate (ZrOCl2·8H 2O) and anhydrous copper(II) sulfate. The reaction of 2-aminothiophenol with aldehydes and anhydrides was carried out efficiently in solvent-free conditions with or without microwave irradiation, and adducts were produced in good to excellent yields. © 2006 Wiley Periodicals, Inc  

    Experimental Removal of Aromatic Hydrocarbons by Thermophilic Bacteria in a Fixed Bed Reactor

    , M.Sc. Thesis Sharif University of Technology Bokaee, Shima (Author) ; Borghei, Mehdi (Supervisor) ; Vossoughi, Manouchehr (Supervisor) ; Zeinali, Majid (Supervisor)
    According to the environmental lows and standards, wastewater of petroleum industries such as refineries and petrochemical that include many petroleum compounds like aromatic and aliphatic hydrocarbons, must be treated up to desirable limit, before entering the collecting network. Using microorganisms is one of the fundamental ways of biodegradation of these polluted compounds. Since phenolic compounds are the main components of raw petroleum, strains that are capable of tolerating phenol and usage of this poisonous hydrocarbon are specifically important. Therefore, in this study the potentiality of the indigenous thermophilic bacterium Nocardia otitidiscaviarum strain TSH1, for degradation... 

    Application of Three–dimensional Molybdenum Oxide Based Metal Organic Framework in Needle Trap Extraction of Chlorobenzenes in Environmental Samples

    , M.Sc. Thesis Sharif University of Technology Karimi Zandian, Faezeh (Author) ; Bagheri, Habib (Supervisor) ; Abbasi, Alireza (Co-Advisor)
    In this study, a three dimensional molybdenum oxide based coordination polymer of{(M¬o2O6)(4,4'–bpy)}n was synthesized by solvothermal process. Excellent properties of the fabricated metal–organic framework such as crystallinity, porosity, sufficient thermal stability and possession of different interactions encouraged us to employ it as a novel extraction phase in sample preparation. Extraction efficiency of the MOF–based sorbent was evaluated in needle trap extraction of some chlorobenzenes as volatile aromatic organic compounds in conjugation with gas chromatography–mass spectrometry. To achieve maximum efficiency and sensitivity, influential parameters including desorption time and... 

    Development of a Kinetic Model for Thermal Cracking of Aromatic Hydrocarbon Feeds

    , M.Sc. Thesis Sharif University of Technology Rezaei Babadi, Ebrahim (Author) ; Khorasheh, Farhad (Supervisor) ; Ivakpour, Javad (Supervisor)
    Most refineries are looking for a process in order to remove heavy compounds and convert them into lighter, more valuable materials. Among the various remaining upgrade processes, non-catalytic heating processes are very attractive and have gotten a wider scope worldwide because the feed used for the upgrade process is high in metal and sulfur, which causes the catalyst surface to become toxic and inactive. Due to that, the thermal cracking process is more suitable for such feeds than the catalytic cracking process. Due to the reduction of sweet crude oil resources and the heavier refinery feeds and increase in amount of global fuel needs, refineries must process a larger share of feed in... 

    Synthesis, Evaluation and Modification of Suitable Metal–Organic Frameworks (MOFS) for Desulfurization of Hydrocarbon Cuts

    , M.Sc. Thesis Sharif University of Technology Ghassa, Mahya (Author) ; Khorashe, Farhad (Supervisor) ; Hajjar, Zeinab (Co-Supervisor) ; Soltanali, Saeed (Co-Supervisor)
    During fuel combustion, aromatic sulfur compounds in energy fuels convert into sulfur oxides, which cause major environmental problems such as acidic rain, global warming, and air pollution. Absorption desulfurization is one of the promising and economical methods to remove these sulfur compounds from fuels. Metal-organic frameworks (MOFs) are a class of nanoporous materials that are of interest for use as adsorbents due to their high specific surface area, unique surface adsorption properties, high adsorption capacity, tunable porosity, flexible dynamic behavior, and diversity in functional and metal groups. In this research, we first synthesized five metal-organic frameworks, namely... 

    (Liquid + liquid) equilibrium for ternary mixtures of {heptane + aromatic compounds + [EMpy][ESO4]} at T = 298.15 K

    , Article Journal of Chemical Thermodynamics ; Volume 43, Issue 10 , 2011 , Pages 1530-1534 ; 00219614 (ISSN) Mirkhani, S. A ; Vossoughi, M ; Pazuki, G. R ; Safekordi, A. A ; Heydari, A ; Akbari, J ; Yavari, M ; Sharif University of Technology
    (Liquid + liquid) equilibrium (LLE) data for the ternary systems (heptane + toluene + 1-ethyl-3-methylpyridinium ethylsulfate) and (heptane + benzene + 1-ethyl-3-methylpyridinium ethylsulfate) were measured at T = 298.15 K and atmospheric pressure. The selectivity and aromatic distribution coefficients, calculated from the equilibrium data, were used to determine if this ionic liquid can be used as a potential extracting solvent for the separation of aromatic compounds from heptane. The consistency of tie-line data was ascertained by applying the Othmer-Tobias and Hand equations  

    Nanoscale graphene oxide sheets as highly efficient carbocatalysts in green oxidation of benzylic alcohols and aromatic aldehydes

    , Article Cuihua Xuebao/Chinese Journal of Catalysis ; Volume 38, Issue 4 , 2017 , Pages 745-757 ; 02539837 (ISSN) Sedrpoushan, A ; Heidari, M ; Akhavan, O ; Sharif University of Technology
    Science Press  2017
    Nanoscale graphene oxide (NGO) sheets were synthesized and used as carbocatalysts for effective oxidation of benzylic alcohols and aromatic aldehydes. For oxidation of alcohols in the presence of H2O2 at 80 °C, the NGOs (20% mass fraction) as carbocatalysts showed selectivity toward aldehyde. The rate and yield of this reaction strongly depended on the nature of substituents on the alcohol. For 4-nitrobenzyl alcohol, <10% of it was converted into the corresponding carboxylic acid after 24 h. By contrast, 4-methoxybenzyl alcohol and diphenylmethanol were completely converted into the corresponding carboxylic acid and ketone after only 9 and 3 h, respectively. The conversion rates for... 

    Rapid biosorption of methylene blue by in situ cellulose-grafted poly 4-hydroxybenzoic acid magnetic nanohybrid: multivariate optimization and isotherm study

    , Article Polymer Bulletin ; Volume 75, Issue 5 , 2018 , Pages 2167-2180 ; 01700839 (ISSN) Alijani, H ; Beyki, M. H ; Kaveh, R ; Fazli, Y ; Sharif University of Technology
    Springer Verlag  2018
    In this research, an efficient biosorption system was developed for methylene blue adsorption over in situ hydrothermally synthesized magnetite 4-hydroxybenzoic acid cellulose nanohybrid. The material was characterized with EDX, VSM, FT-IR, FESEM, and TEM techniques. Results showed that the nanohybrid is a micro-cluster composed of stacked nanoscale particles. Multivariate optimization with Box–Behnken design was used to evaluate effective parameters on adsorption and their interaction. Results showed that pH, shacking time, and adsorbent dosage are effective parameters on MB adsorption. Adsorption rate is fast with equilibrium time of 5.5 min. Isotherm study revealed that the adsorption... 

    Effects of topological constraints on linked ring polymers in solvents of varying quality

    , Article Soft Matter ; Volume 16, Issue 12 , 2020 , Pages 3029-3038 Ahmadian Dehaghani, Z ; Chubak, I ; Likos, C. N ; Ejtehadi, M. R ; Sharif University of Technology
    Royal Society of Chemistry  2020
    We investigate the effects of topological constraints in catenanes composed of interlinked ring polymers on their size in a good solvent as well as on the location of their θ-point when the solvent quality is worsened. We mainly focus on poly[n]catenanes consisting of n ring polymers each of length m interlocked in a linear fashion. Using molecular dynamics simulations, we study the scaling of the poly[n]catenane's radius of gyration in a good solvent, assuming in general that Rg ∼ mμnν and we find that μ = 0.65 ± 0.02 and ν = 0.60 ± 0.01 for the range of n and m considered. These findings are further rationalized with the help of a mean-field Flory-like theory yielding the values of μ =... 

    Synthesis, characterization and catalytic activity of novel monomeric and polymeric vanadyl Schiff base complexes

    , Article Journal of Molecular Catalysis A: Chemical ; Volume 245, Issue 1-2 , 2006 , Pages 12-16 ; 13811169 (ISSN) Boghaei, D. M ; Bezaatpour, A ; Behzad, M ; Sharif University of Technology
    This article describes the synthesis and characterization of two novel, as well as four previously reported, Schiff base complexes of oxovanadium(IV) and the study of their catalytic reactivity in the aerobic oxidation of olefins. The novel (5-Br-3-NO2salen) and (5-Br-3-NO2meso-stein) ligands were, respectively, synthesized from condensation of 5-bromo-3-nitro-2-hydroxybenzaldehyde with ethylenediamine or meso-1,2-diphenyl-1,2-ethylenediamine. The reaction of these ligands with VO(acac)2 readily resulted in the synthesis of their oxovanadium(IV) complexes [VO(5-Br-3-NO2salen)] and [VO(5-Br-3-NO2meso- stein)], respectively. The novel ligands and complexes were deliberately designed to... 

    Solvatochromic parameters for binary mixtures of 1-(1-butyl)-3- methylimidazolium tetrafluoroborate with some protic molecular solvents

    , Article Journal of Physical Chemistry B ; Volume 110, Issue 13 , 2006 , Pages 7073-7078 ; 15206106 (ISSN) Harifi Mood, A. R ; Habibi-Yangjeh, A ; Gholami, M. R ; Sharif University of Technology
    American Chemical Society  2006
    The solvatochromic parameters (ETN, normalized polarity parameter; π*, dipolarity/polarizability; β, hydrogen-bond acceptor basicity; α, hydrogen-bond donor acidity) were determined for binary solvent mixtures of 1-(1-butyl)-3-methylimidazolium tetrafluoroborate ([bmim]BF4) with water, methanol, and ethanol at 25°C over the whole range of mole fractions. In nonaqueous solutions, the ETN value of the mixture increases with mole the fraction of [bmim]BF4 and then decreases gradually to the value of pure [bmim]BF4. Positive deviation from ideal behavior was observed for the solvent parameters ETN, π*, and α, whereas the deviation of the β parameter is negative. The applicability of the combined... 

    Optimizing temperature and introducing new process arrangements for elevating clay's longevity based on the known poisons in the separation process of trace olefins from aromatics

    , Article Journal of Chemical Technology and Biotechnology ; 2021 ; 02682575 (ISSN) Rouhani, H ; Farhadi, F ; Akbari Kenari, M ; Ramakrishna, S ; Sharif University of Technology
    John Wiley and Sons Ltd  2021
    BACKGROUND: The clay treatment widely utilized to reduce unsaturated components in aromatic stream has a detrimental effect on catalyst lifetime. Due to the short lifetime of commercial clay, a huge number of studies have been carried out to address this problem over the last decade. This study aims to optimize the temperature for longer serviceability of clay by removal of unsaturated aliphatic components from aromatic streams through the adsorption and catalytic properties of clay. A novel process arrangement is introduced by scheduling the reuse of deactivated clay that is discarded after deactivation. RESULTS: Results showed that the suitable range of temperature for olefin removal is... 

    Supercritical extraction of phenanthrene in the crossover region

    , Article Journal of Chemical and Engineering Data ; Volume 50, Issue 1 , 2005 , Pages 49-51 ; 00219568 (ISSN) Esmaeilzadeh, F ; Goodarznia, I ; Sharif University of Technology
    An experimental flow-type apparatus has been tested for the separation of phenanthrene from a mixture of solids (phenanthrene, anthracene, and carbazole) and also from anthracene oil of the Isfahan Coal Tar Refining Company based on retrograde crystallization phenomena in supercritical carbon dioxide. The results show that by exploiting the crossover effect it is possible to obtain (82 and 24) mass % of phenanthrene from the solid mixture and anthracene oil, respectively, with a single temperature cycle