The Experts below are selected from a list of 1683 Experts worldwide ranked by ideXlab platform
Mahdieh Darijani - One of the best experts on this subject based on the ideXlab platform.
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Structural effects on kinetics and a mechanistic investigation of the reaction between DMAD and N–H heterocyclic compound in the presence of Triphenylarsine: spectrophotometry approach
Chemistry Central journal, 2017Co-Authors: Sayyed Mostafa Habibi-khorassani, Mehdi Shahraki, Mahdieh DarijaniAbstract:Kinetics and a mechanistic investigation of the reaction between dimethyl acetylenedicarboxcylate (DMAD) and saccharin (N–H heterocyclic compound) has been spectrally studied in methanol environment in the presence of Triphenylarsine (TPA) as a catalyst. Previously, in a similar reaction, triphenylphosphine (TTP) (instead of Triphenylarsine) has been employed as a third reactant (not catalyst) for the generation of an ylide (final product) while, in the present work the titled reaction in the presence of TPA leaded to the especial N-vinyl heterocyclic compound with different kinetics and mechanism. The reaction followed second order kinetics. In the kinetic study, activation energy and parameters (Ea, ΔH‡, ΔS‡ and ΔG‡) were determined. Also, the structural effect of the N–H heterocyclic compound was investigated on the reaction rate. The result showed that reaction rate increases in the presence of isatin (N–H compound) that participates in the second step (step2), compared to saccharin (another N–H compound). This was a good demonstration for the second step (step2) of the reaction that could be considered as the rate- determining step (RDS). As a significant result, not only a change in the structure of the reactant (TPA instead of TPP) creates a different product, but also kinetics and the reaction mechanism have been changed.
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structural effects on kinetics and a mechanistic investigation of the reaction between dmad and n h heterocyclic compound in the presence of Triphenylarsine spectrophotometry approach
Chemistry Central Journal, 2017Co-Authors: Sayyed Mostafa Habibikhorassani, Mehdi Shahraki, Mahdieh DarijaniAbstract:Kinetics and a mechanistic investigation of the reaction between dimethyl acetylenedicarboxcylate (DMAD) and saccharin (N–H heterocyclic compound) has been spectrally studied in methanol environment in the presence of Triphenylarsine (TPA) as a catalyst. Previously, in a similar reaction, triphenylphosphine (TTP) (instead of Triphenylarsine) has been employed as a third reactant (not catalyst) for the generation of an ylide (final product) while, in the present work the titled reaction in the presence of TPA leaded to the especial N-vinyl heterocyclic compound with different kinetics and mechanism. The reaction followed second order kinetics. In the kinetic study, activation energy and parameters (Ea, ΔH‡, ΔS‡ and ΔG‡) were determined. Also, the structural effect of the N–H heterocyclic compound was investigated on the reaction rate. The result showed that reaction rate increases in the presence of isatin (N–H compound) that participates in the second step (step2), compared to saccharin (another N–H compound). This was a good demonstration for the second step (step2) of the reaction that could be considered as the rate- determining step (RDS). As a significant result, not only a change in the structure of the reactant (TPA instead of TPP) creates a different product, but also kinetics and the reaction mechanism have been changed.
Mohamed Makha - One of the best experts on this subject based on the ideXlab platform.
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highly stereoselective construction of functionalized cyclopropanes from the reaction between acetylenic esters and c h acids in the presence of Triphenylarsine
Tetrahedron Letters, 2009Co-Authors: Malek Taher Maghsoodlou, Sayyed Mostafa Habibi Khorassani, Reza Heydari, Faramarz Rostami Charati, Nourollah Hazeri, Mojtaba Lashkari, Mohsen Rostamizadeh, Ghasem Marandi, Alexandre N. Sobolev, Mohamed MakhaAbstract:Abstract A one-pot Triphenylarsine-catalyzed synthesis of trans -cyclopropane derivatives is achieved by means of the reaction between acetylenic esters and C–H acids in the presence of Triphenylarsine. This procedure is simple and proceeds under mild reaction conditions. Its success depends on the choice of solvent, temperature and C–H acid used.
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Highly stereoselective construction of functionalized cyclopropanes from the reaction between acetylenic esters and C–H acids in the presence of Triphenylarsine
Tetrahedron Letters, 2009Co-Authors: Malek Taher Maghsoodlou, Sayyed Mostafa Habibi Khorassani, Reza Heydari, Faramarz Rostami Charati, Nourollah Hazeri, Mojtaba Lashkari, Mohsen Rostamizadeh, Ghasem Marandi, Alexandre N. Sobolev, Mohamed MakhaAbstract:Abstract A one-pot Triphenylarsine-catalyzed synthesis of trans -cyclopropane derivatives is achieved by means of the reaction between acetylenic esters and C–H acids in the presence of Triphenylarsine. This procedure is simple and proceeds under mild reaction conditions. Its success depends on the choice of solvent, temperature and C–H acid used.
Ali Nemati Kharat - One of the best experts on this subject based on the ideXlab platform.
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Tail-to-tail dimerization of methyl acrylate in the presence of Triphenylarsine ruthenium complexes
Journal of Coordination Chemistry, 2014Co-Authors: Ava Behnia, Bahareh Tamaddoni Jahromi, Ali Nemati KharatAbstract:Catalytic dimerization of methyl acrylate by homogenous ruthenium catalysts was investigated. The effect of the addition of acidic additives, supporting ligands, polymerization inhibitor, and reaction conditions on the selectivity of dimerization was studied, and possible reaction mechanism was discussed. Conversion and selectivity were significantly affected by using Triphenylarsine as supporting ligand. Under mild conditions, conversion up to 98% with good selectivity to tail-to-tail product was achieved.
Danyi Wu - One of the best experts on this subject based on the ideXlab platform.
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Triphenylarsine catalyzed cyclopropanation highly stereoselective synthesis of trans 2 3 dihydro spiro cyclopropane 1 2 indan 1 3 dione from alkene and phenacyl bromide
Synthetic Communications, 2008Co-Authors: Weiqi Tong, Hongmei Deng, Jie Chen, Danyi WuAbstract:Abstract The Triphenylarsine-catalyzed approach for the highly stereoselective synthesis of trans-2,3-dihydro-spiro[cyclopropane-1,2′-indan-1′,3′-dione] with alkenes and phenacyl bromide in organic solvent is described. The Triphenylarsine-catalyzed cyclopropanation in water was investigated. The mixture of cis/trans isomers is provided with water as a solvent. The cis isomer is formed using water as a solvent. The reactivity of the reaction in water is higher than that in the organic solvent.
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Triphenylarsine-Catalyzed Cyclopropanation: Highly Stereoselective Synthesis of Trans -2,3-Dihydro-Spiro[Cyclopropane-1,2′-Indan-1′,3′-dione] from Alkene and Phenacyl Bromide
Synthetic Communications, 2008Co-Authors: Weiqi Tong, Hongmei Deng, Jie Chen, Danyi WuAbstract:Abstract The Triphenylarsine-catalyzed approach for the highly stereoselective synthesis of trans-2,3-dihydro-spiro[cyclopropane-1,2′-indan-1′,3′-dione] with alkenes and phenacyl bromide in organic solvent is described. The Triphenylarsine-catalyzed cyclopropanation in water was investigated. The mixture of cis/trans isomers is provided with water as a solvent. The cis isomer is formed using water as a solvent. The reactivity of the reaction in water is higher than that in the organic solvent.
Yu Wang - One of the best experts on this subject based on the ideXlab platform.
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one pot method for stereoselective cyclopropanation of electron deficient olefins with methyl bromoacetate and phenacyl bromide in the presence of Triphenylarsine
Synthesis, 2005Co-Authors: Weiyu Ding, Yu WangAbstract:A Triphenylarsine-catalyzed one-pot procedure for the preparation of cis-cyclopropanes with acyclic electron-deficient olefins with carbonyl-stabilized arsonium ylides formed from methyl bromoacetate or phenacyl bromide in the presence of NaHCO 3 has been achieved. This method is simple, high-yielding and cis-selective. The success of this method depends on the choice of base solvent and temperature.
