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    Synthesis of β-hydroxy dithiocarbamate derivatives via regioselective addition of dithiocarbamate anion to epoxide in water

    , Article Canadian Journal of Chemistry ; 2006, 84, 1515-1519 Ziyaei-Halimjani, A. (Azim) ; Saidi, M. R ; Sharif University of Technology
    Abstract
    The reactions of different dithiocarbamate anions with epoxides were investigated in water. With this method, β-hydroxy dithiocarbamate derivatives were synthesized in high yields. The reaction was also carried out in DMF in the presence of lithium perchlorate with a simple work-up procedure, and the results are compared  

    Synthesis of β-hydroxy dithiocarbamate derivatives via regioselective addition of dithiocarbamate anion to epoxide in water

    , Article Canadian Journal of Chemistry ; Volume 84, Issue 11 , 2006 , Pages 1515-1519 ; 00084042 (ISSN) Ziyaei Halimjani, A ; Saidi, M. R ; Sharif University of Technology
    2006
    Abstract
    The reactions of different dithiocarbamate anions with epoxides were investigated in water. With this method, β-hydroxy dithiocarbamate derivatives were synthesized in high yields. The reaction was also carried out in DMF in the presence of lithium perchlorate with a simple work-up procedure, and the results are compared. © 2006 NRC  

    An efficient one-pot Michael addition of dithiocarbamate anion to α,β-unsaturated olefins mediated by lithium perchlorate

    , Article Journal of Sulfur Chemistry ; Volume 26, Issue 2 , 2005 , Pages 149-153 ; 17415993 (ISSN) Ziyaei-Halimjani, A ; Saidi, M. R ; Sharif University of Technology
    Taylor and Francis Ltd  2005
    Abstract
    The reaction of substituted dithiocarbamates with electrophilic alkenes in the presence of LiClO4 was investigated in an attempt to prepare numerous ethyl dithiocarbamates bearing β-electron-withdrawing-group substituents. The reaction conditions are mild, neutral, with extremely simple work-up procedures, and offer high yield. © 2005 Taylor & Francis Group Ltd  

    Reductive amination of aldehydes with sodium borohydride and lithium aluminum hydride in the presence of lithium perchlorate

    , Article Journal of the Iranian Chemical Society ; Volume 4, Issue 2 , 2007 , Pages 194-198 ; 1735207X (ISSN) Saidi, M. R ; Brown, R. S ; Ziyaei Halimjani, A ; Sharif University of Technology
    Iranian Chemical Society  2007
    Abstract
    A one-pot high yielding reductive amination of aldehydes with primary and secondary amines using LiClO4/NaBH4 and LiClO 4/LiAlH4 as reducing agents in diethyl ether is described  

    Synthesis of Dithiocarbamate Salts, Reaction of Divinyl Sulfone with Amines and CS2 & Polymerization of Diamines and CS2 with Michael Acceptors

    , M.Sc. Thesis Sharif University of Technology Raesi, Mozhgan (Author) ; Mahmoodi Hashemi, Mohammad (Supervisor) ; Ziyaei Halimjani, Azim (Supervisor)
    Abstract
    At the first part of project, different kinds of monodithiocarbamates were synthesized.In order to prepare these compounds two methods have been used:Reactions of amines and carbon disulfide in water and finally addition of Michael acceptors.Reaction of amines and carbon disulfide, then addition of alkyl halides under solvent-free conditions.Dithiocarbamate salts are prepared in ether by using CF3SO3CH3 as the methylation agent with resulted monodithiocarbamates at the first part of the project. These salts are found to be ionic liquids, which is important class of organic compounds.At the second part of project, the Michael additions of amines with divinyl sulfone are investigated in... 

    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  

    Minimizing the levelized cost of energy in an offshore wind farm with non-homogeneous turbines through layout optimization

    , Article Ocean Engineering ; Volume 249 , 2022 ; 00298018 (ISSN) Ziyaei, P ; Khorasanchi, M ; Sayyaadi, H ; Sadollah, A ; Sharif University of Technology
    Elsevier Ltd  2022
    Abstract
    Minimum cost of energy is the main goal of a wind farm layout optimization. This is achieved by maximizing the total energy while minimizing the total costs of the farm. In this study, two sizes of commercial turbines were considered to investigate the effect of a non-homogenous farm on the layout optimization process. A cost model consisting of turbines, cable, transformers, foundation, and service vehicle routes was developed. Using Genetic Algorithm and Artificial Neural Network, first the superiority of the new algorithm in turbines and cable layout was verified versus previous studies. Next, two cases were investigated, i.e. (1) a farm populated with identical turbines and (2) a farm... 

    Dynamic NMR studies of N-benzoyl pyrrolidine and N-benzoyl piperidine derivatives

    , Article Journal of Molecular Structure ; Volume 886, Issue 1-3 , August , 2008 , Pages 24-31 ; 00222860 (ISSN) Tafazzoli, M ; Ziyaei Halimjani, A ; Ghiasi, M ; Fattahi, M ; Saidi, M. R ; Sharif University of Technology
    2008
    Abstract
    Variable-temperature 1H and 13C NMR spectroscopy are used to investigate barrier of C-N rotation in series of amides, such as N-benzoyl pyrrolidine, N-(4-chlorobenzoyl) pyrrolidine, N-(4-methoxybenzoyl) pyrrolidine, N-(4-chlorobenzoyl) piperidine, and N-(4-methoxybenzoyl) piperidine. Δ G298≠ of 65.2, 60.6, 58.8, 60.1, and 57.1 kJ mol-1are found for the above compounds, respectively. Theoretical studies were done for these compounds and the results showed good agreement with the experimental results. Theoretical and experimental results showed that substituted methoxy group on the para position of benzene ring decreases the rotational barrier. Increasing steric effect and therefore... 

    A novel system for electricity and synthetic natural gas production from captured CO2: Techno-economic evaluation and multi-objective optimization

    , Article Journal of CO2 Utilization ; Volume 63 , 2022 ; 22129820 (ISSN) Beyrami, J ; Jalili, M ; Ziyaei, M ; Chitsaz, A ; Rosen, M. A ; Sharif University of Technology
    Elsevier Ltd  2022
    Abstract
    To mitigate global warming and fossil fuel shortages a novel oxy-fuel combustion power plant integrated with a power to gas system is proposed. A net-zero emission MATIANT cycle with inherent CO2 capture ability is selected as the power cycle also providing the CO2 and power demand of the power to gas system, which comprises a proton exchange membrane electrolyzer for hydrogen production and a Sabatier reactor for methanation. A techno-economic investigation, a multi-objective optimization, and a sensitivity analysis are carried out. A comprehensive economic method that covers all economic aspects is utilized, and a Sabatier reactor model which considers the possibility of the presence of... 

    One-pot Three-component route for the synthesis of functionalized 4H-chromenes catalyzed by ZrOCl2·8H2O in water

    , Article Journal of Heterocyclic Chemistry ; Volume 55, Issue 2 , 2018 , Pages 522-529 ; 0022152X (ISSN) Ziyaei Halimehjani, A ; Keshavarzi, N ; Sharif University of Technology
    HeteroCorporation  2018
    Abstract
    An efficient method for the synthesis of functionalized 4H-chromenes via a one-pot three-component condensation reaction of a 2-hydroxybenzaldehyde with an active methylene compound and a carbon-based nucleophile in the presence of a catalytic amount of ZrOCl2·8H2O in water under thermal condition has been described. High yields, simple work-up procedure, performing reactions in water and synthesis of complex molecules with a one-pot procedure are the main advantages of this procedure. In addition, the structure of the product from the condensation of salicylaldehyde, 2-naphthol, and dimedone was confirmed by X-ray crystallography. © 2018 Wiley Periodicals, Inc  

    One-pot synthesis of dithiocarbamates accelerated in water

    , Article Journal of Organic Chemistry ; Volume 71, Issue 9 , 2006 , Pages 3634-3635 ; 00223263 (ISSN) Azizi, N ; Aryanasab, F ; Torkiyan, L ; Ziyaei, A ; Saidi, M. R ; Sharif University of Technology
    2006
    Abstract
    Highly efficient one-pot reactions of amines and carbon disulfide with α,β-unsaturated compounds were carried out in water under a mild and green procedure with high yields. © 2006 American Chemical Society  

    Synthesis of aza-Henry products and enamines in water by Michael addition of amines or thiols to activated unsaturated compounds

    , Article Tetrahedron Letters ; Volume 49, Issue 7 , 2008 , Pages 1244-1248 ; 00404039 (ISSN) Ziyaei Halimehjani, A ; Saidi, M. R ; Sharif University of Technology
    2008
    Abstract
    Nitroamines and nitrothiols were synthesized in high yields by the Michael addition of amines and thiols to nitroolefins without using any catalyst. Also, the reaction of amines with dimethylacetylene dicarboxylate (DMAD) in water afforded the corresponding enamines. © 2007 Elsevier Ltd. All rights reserved  

    Chemoselective and convenient preparation of 1,1-diacetates from aldehydes, mediated by solid lithium perchlorate under solvent-free conditions

    , Article Journal of Molecular Catalysis A: Chemical ; Volume 238, Issue 1-2 , 2005 , Pages 138-141 ; 13811169 (ISSN) Ziyaei, A ; Azizi, N ; Saidi, M. R ; Sharif University of Technology
    2005
    Abstract
    A simple, efficient, and general method has been developed for the conversion of aldehydes to 1,1-diacetates with the use of acetic anhydride and solid LiClO4 under first solvent-free and mild conditions in good yields. This method applies to not only simple but also to conjugated aldehydes. © 2005 Elsevier B.V. All rights reserved  

    Dithiocarbamate as an efficient intermediate for the synthesis of 2-(alkylthio)thiazol-4(5H)-ones

    , Article Journal of Sulfur Chemistry ; Volume 37, Issue 5 , 2016 , Pages 529-536 ; 17415993 (ISSN) Ziyaei Halimehjani, A ; Alaei, M. A ; Soleymani Movahed, F ; Jomeh, N ; Saidi, M. R ; Sharif University of Technology
    Taylor and Francis Ltd  2016
    Abstract
    An effective approach for the synthesis of 2-(alkylthio)thiazol-4(5H)-ones from alkyl dithiocarbamates and chloroacetyl chloride in the presence of NaHCO3 has been developed. Good to excellent yields of products, simple reaction conditions and general applicability are the most important advantages of this protocol  

    Catalyst-free regioselective ring opening of epoxides with aromatic amines in water and solvent-free conditions

    , Article Journal of the Iranian Chemical Society ; Volume 10, Issue 1 , February , 2013 , Pages 7-11 ; 1735207X (ISSN) Ziyaei Halimehjani, A ; Gholami, H ; Saidi, M. R ; Sharif University of Technology
    2013
    Abstract
    Without using any catalysts, a variety of epoxides undergo ring-opening by aromatic amines to afford the corresponding 1,2-amino alcohols in high to excellent yields with good regioselectivity in the presence of water as solvent and under solvent-free conditions  

    Highly efficient and catalyst-free synthesis of unsymmetrical thioureas under solvent-free conditions

    , Article Tetrahedron Letters ; Volume 50, Issue 1 , 2009 , Pages 32-34 ; 00404039 (ISSN) Ziyaei Halimehjani, A ; Pourshojaei, Y ; Saidi, M. R ; Sharif University of Technology
    2009
    Abstract
    A highly efficient and simple synthesis of unsymmetrical thioureas is reported based on the reaction of readily synthesized dithiocarbamates with amines, without using any catalyst under solvent-free conditions. The short reaction time, high yields, and solvent-free conditions are advantages of this method. We did not observe the formation of any symmetric disubstituted thiourea, under these reaction conditions. © 2008 Elsevier Ltd. All rights reserved  

    Regiospecific iodocyclization of S-allyl dithiocarbamates: synthesis of 2-imino-1,3-dithiolane and 2-iminium-1,3-dithiolane derivatives

    , Article Tetrahedron Letters ; Volume 50, Issue 23 , 2009 , Pages 2747-2749 ; 00404039 (ISSN) Ziyaei Halimehjani, A ; Maleki, H ; Saidi, M. R ; Sharif University of Technology
    2009
    Abstract
    4-Alkyl-2-imino-1,3-dithiolanes and 4-alkyl-2-iminium-1,3-dithiolanes were prepared in excellent yields with complete regiospecificity under mild conditions by the iodocyclization of S-allyl dithiocarbamates. Dehydrohalogenation of the 4-alkyl-2-imino-1,3-dithiolanes gave 4-alkylidene-2-imino-1,3-dithiolanes in excellent yields. © 2009 Elsevier Ltd. All rights reserved  

    Catalyst-free Friedel-Crafts alkylation of naphthols with nitrostyrenes in the presence of water

    , Article Tetrahedron Letters ; Volume 50, Issue 13 , 2009 , Pages 1441-1443 ; 00404039 (ISSN) Ziyaei Halimehjani, A ; Aryanasab, F ; Saidi, M. R ; Sharif University of Technology
    2009
    Abstract
    Accelerated Michael-type Friedel-Crafts alkylation of naphthols with nitrostyrenes in the presence of water is reported. The procedure is simple, catalyst-free, and affords good yields of the products. © 2009 Elsevier Ltd. All rights reserved  

    Offshore Windfarm Layout Optimization

    , M.Sc. Thesis Sharif University of Technology Ziyaei, Pegah (Author) ; Khorasanchi, Mahdi (Supervisor) ; Sayyadi, Hassan (Co-Supervisor)
    Abstract
    The minimum cost of energy is the goal of the wind farm layout optimization. This can be achieved by either maximizing the total energy or minimizing the total costs of the farm. This thesis considered the effect of wind speed on the performance and thrust coefficients. We also used two sizes of commercial turbines. First, we started by a single variable objective function (turbine cost to generated power), then, considering cable, foundation and O&M modules, objective function changed to a LCOE function which is non-dimensionalized by dividing all the costs to the cost of one turbine. We modified the simple cost model proposed by Mosetti et al., using cost scaling law, and also included... 

    A study of glycine-based dithiocarbamates as effective corrosion inhibitors for cold rolled carbon steel in HCl solutions

    , Article Surfaces and Interfaces ; Volume 21 , 2020 Zeinali Nikoo, S ; Shockravi, A ; Mokarami Ghartavol, H ; Ziyaei Halimehjani, A ; Ostadrahimi, M ; Mirhosseini, S. M ; Behzadi, H ; Ghorbani, M ; Sharif University of Technology
    Elsevier B.V  2020
    Abstract
    The corrosion inhibition of glycine-based dithiocarbamates with benzyl (BDTC) and propyl (PDTC) groups were investigated for cold rolled carbon steel (CRS) in 0.5 M HCl, indicating that the compounds as mixed type inhibitors significantly reduced the corrosion rate of the CRS due to the formation of a stable protective film on the metal surface. As confirmed by ATR-FTIR, SEM, AFM, XPS and theoretical studies, chemically adsorbed BDTC molecule is a better corrosion inhibitor with higher corrosion efficiency of about 98% at room temperature and a better thermal stability attributed to the Fe-S and Fe-N bindings, and in addition, to the presence of the benzene ring in the molecular structure. ©...