The Experts below are selected from a list of 1920 Experts worldwide ranked by ideXlab platform
Davood Nematollahi - One of the best experts on this subject based on the ideXlab platform.
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insight into the electrochemical oxidation of n n dialkyl p phenylenediamines in the presence of malononitrile and methyl cyanoacetate a convergent paired electrochemical method for the synthesis of cyanide and dicyanide derivatives of phenylcarbonim
Journal of Electroanalytical Chemistry, 2016Co-Authors: Davood Nematollahi, Fatemeh Ghasemi, Mahnaz Sharafikolkeshvandi, Fahimeh VarmaghaniAbstract:Abstract The electrochemical oxidation of N , N -dialkyl- p -phenylenediamines has been studied in the presence of malononitrile and methyl cyanoacetate as nucleophiles in water/ethanol (80:20, v/v) mixture using some electrochemical techniques (cyclic voltammetry, chronoamperometry, chronoCoulometry and controlled-potential Coulometry). Diagnostic criteria of the electrochemical methods in keeping with spectroscopic data of the isolated products revealed that N , N -dialkyl- p -phenylenediamines in the presence of malononitrile and methyl cyanoacetate via a convergent paired electrochemical process are converted to cyanide and dicyanide derivatives of phenylcarbonimidoyl. The present work has led to development of a green and one-pot method for the synthesis of the title compounds.
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chemical and electrochemical syntheses of benzo b 1 4 diazepine 7 8 diones
ChemInform, 2015Co-Authors: Davood Habibi, Davood Nematollahi, Hossein Mohammadkhani Pordanjani, Mohammad Reza SadeghiAbstract:Electrochemical and chemical syntheses of benzodiazepinediones were carried out from the reaction of catechols with N,N′-dialkylproylenediamine in aqueous solution at room temperature, using CV and controlled-potential Coulometry with K3Fe(CN)6 as an oxidant.
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electrochemical oxidation of catechols in the presence of cyanoacetone and methyl cyanoacetate
Journal of Electroanalytical Chemistry, 2009Co-Authors: Mohammad Rafiee, Davood NematollahiAbstract:Abstract Electrochemical oxidation of catechols is studied in the presence of cyanoacetone and methyl cyanoacetate as nucleophiles in aqueous solutions by means of cyclic voltammetry and controlled-potential Coulometry. The reaction mechanism is believed to be ECEC including oxidation of catechol, intermolecular Michael addition, oxidation of adduct and intramolecular Michael addition. Final products are nitrile containing benzofurans. The observed homogeneous rate constants ( k obs ) of reactions are estimated by digital simulation of cyclic voltammograms. Also the effects of nucleophile and catechol structures on the rate constants of chemical reactions are described.
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kinetic study of electrochemically induced michael reactions of o quinones with meldrum s acid derivatives synthesis of highly oxygenated catechols
Journal of Organic Chemistry, 2008Co-Authors: Davood Nematollahi, Hassan ShayanijamAbstract:Electrochemical oxidation of catechols has been studied in the presence of Meldrum’s acid derivatives as nucleophiles in aqueous solution, by means of cyclic voltammetry and controlled-potential Coulometry. Catechols in the Michael addition reaction react with Meldrum’s acids to form adducts that can undergo electrooxidation. Such products were obtained in good yields as confirmed by controlled potential electrosynthesis. Such products can be generated in aqueous solutions by means of electrosynthesis, using a carbon electrode in an undivided cell. Furthermore, the homogeneous rate constants of the chemical reaction interposed between electron transfers were estimated by comparing the experimental cyclic voltammetric curves with the digitally simulated ones.
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electrosynthesis of symmetric and highly conjugated benzofuran via a unique ececcc electrochemical mechanism evidence for predominance of electrochemical oxidation versus intramolecular cyclization
Journal of Organic Chemistry, 2007Co-Authors: Davood Nematollahi, And Amene Amani, Esmail TammariAbstract:Electrochemical oxidation of hydroquinone, catechol, and some of their monosubstituted derivatives has been studied in the presence of 3-hydroxy-1H-phenalen-1-one (2) as a nucleophile in water/acetonitrile (80/20) solutions using cyclic voltammetry and controlled-potential Coulometry methods. The results revealed that quinones derived from oxidation of hydroquinones and catechols participate in Michael addition reactions with 2. The formed adducts convert to the corresponding benzofuran derivatives via different mechanisms. In this work, we derived a variety of products with good yields using controlled potential electrochemical oxidation at a graphite electrode in an undivided cell.
H Goodarzi - One of the best experts on this subject based on the ideXlab platform.
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electrochemical study of catechol and some of 3 substituted catechols in the presence of 1 3 diethyl 2 thio barbituric acid application to the electro organic synthesis of new dispirothiopyrimidine derivatives
Journal of Electroanalytical Chemistry, 2001Co-Authors: Davood Nematollahi, H GoodarziAbstract:Electrochemical oxidation of catechol (1a), 3-methylcatechol (1b) and 3-methoxycatechol (1c) in the presence of 1,3-diethyl-2-thiobarbituric acid (3) as a nucleophile in aqueous solution has been studied using cyclic voltammetry and controlled-potential Coulometry. The results indicate that (1a–1c) participating in a 1,4 (Michael) addition reaction converts to dispirothiopyrimidine derivatives (6a–6c). The electrochemical synthesis of 6a–6c has been successfully performed in an undivided cell in good yield and purity.
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electrochemical study of catechol and some of 3 substituted catechols in the presence of 1 3 diethyl 2 thio barbituric acid application to the electro organic synthesis of new dispirothiopyrimidine derivatives
Journal of Electroanalytical Chemistry, 2001Co-Authors: Davood Nematollahi, H GoodarziAbstract:Electrochemical oxidation of catechol (1a), 3-methylcatechol (1b) and 3-methoxycatechol (1c) in the presence of 1,3-diethyl-2-thiobarbituric acid (3) as a nucleophile in aqueous solution has been studied using cyclic voltammetry and controlled-potential Coulometry. The results indicate that (1a–1c) participating in a 1,4 (Michael) addition reaction converts to dispirothiopyrimidine derivatives (6a–6c). The electrochemical synthesis of 6a–6c has been successfully performed in an undivided cell in good yield and purity.
S M Golabi - One of the best experts on this subject based on the ideXlab platform.
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electrochemical study of 3 4 dihydroxybenzoic acid and 4 tert butylcatechol in the presence of 4 hydroxycoumarin application to the electro organic synthesis of coumestan derivatives
Journal of Electroanalytical Chemistry, 1997Co-Authors: S M Golabi, Davood NematollahiAbstract:Electrochemical oxidation of 3,4-dihydroxybenzoic acid (I) and 4-tert-butylcatechol (V) in the presence of 4-hydroxycoumarin (II) as nucleophile in aqueous solution has been studied using cyclic voltammetry and controlled-potential Coulometry. The results indicate that I via a 1,4-addition (Michael) reaction under electro-decarboxylation reaction converts to coumestan IV, and V via 1,4- (Michael) and 1,6-addition reactions converts to new coumestan VII. The electrochemical synthesis of IV and VII has been performed successfully in an undivided cell in good yield and purity.
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electrochemical study of catechol and some 3 substituted catechols in the presence of 4 hydroxy coumarin application to the electro organic synthesis of new coumestan derivatives
Journal of Electroanalytical Chemistry, 1997Co-Authors: S M Golabi, Davood NematollahiAbstract:Abstract Electrochemical oxidation of catechol ( 1d ), 3-methylcatechol ( 1a ), 3-methoxycatechol ( 1b ) and 2,3-dihydroxybenzoic acid ( 1c ) in the presence of 4-hydroxycoumarin as nucleophile in aqueous solution has been studied using cyclic voltammetry and controlled-potential Coulometry. The results indicate that ( 1a–1d ) participating in a 1,4 (Michael) addition reaction convert to coumestan derivatives ( 5a–5d ). The electrochemical synthesis of 5a–5d has been successfully performed in an undivided cell in good yield and purity.
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electrochemical study of catechol and 4 methylcatechol in methanol application to the electro organic synthesis of 4 5 dimethoxy and 4 methoxy 5 methyl o benzoquinone
Journal of Electroanalytical Chemistry, 1996Co-Authors: Davood Nematollahi, S M GolabiAbstract:Electrochemical oxidation of catechol (I) and 4-methylcatechol (VII) in methanol has been studied using cyclic voltammetry and controlled-potential Coulometry. The results indicate that I and VII, on methoxylation reactions under ECECE and ECE mechanisms, convert to 4,5-dimethoxy (VI) and 4-methoxy-5-methyl(X)-o-benzoquinone respectively. The electrochemical synthesis of VI and X has been successfully performed in experimental conditions and their yields were calculated as 95% and 85% respectively.
Mohammad Rafiee - One of the best experts on this subject based on the ideXlab platform.
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electrochemical oxidation of catechols in the presence of cyanoacetone and methyl cyanoacetate
Journal of Electroanalytical Chemistry, 2009Co-Authors: Mohammad Rafiee, Davood NematollahiAbstract:Abstract Electrochemical oxidation of catechols is studied in the presence of cyanoacetone and methyl cyanoacetate as nucleophiles in aqueous solutions by means of cyclic voltammetry and controlled-potential Coulometry. The reaction mechanism is believed to be ECEC including oxidation of catechol, intermolecular Michael addition, oxidation of adduct and intramolecular Michael addition. Final products are nitrile containing benzofurans. The observed homogeneous rate constants ( k obs ) of reactions are estimated by digital simulation of cyclic voltammograms. Also the effects of nucleophile and catechol structures on the rate constants of chemical reactions are described.
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electrochemical nitration of catechols kinetic study by digital simulation of cyclic voltammograms
Journal of Electroanalytical Chemistry, 2007Co-Authors: Davood Nematollahi, Atri Ariapad, Mohammad RafieeAbstract:Electrochemical nitration of catechols has been studied in the presence of nitrite ion as nucleophile in aqueous solution, by means of cyclic voltammetry and controlled-potential Coulometry. The results indicate the participation of produced o-benzoquinones in Michael reaction with nitrite ion to form the corresponding nitrocatechols. Based on EC mechanism, the observed homogeneous rate constants of nitration reaction were estimated by comparing the experimental cyclic voltammograms with the digital simulated results.
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diversity in electrochemical oxidation of dihydroxybenzoic acids in the presence of acetylacetone a green method for synthesis of new benzofuran derivatives
Green Chemistry, 2005Co-Authors: Davood Nematollahi, Mohammad RafieeAbstract:Electrochemical oxidation of diol derivatives of benzoic acid (1–3) have been studied in the presence of acetylacetone (4) as the nucleophile in aqueous solutions, using cyclic voltammetry and controlled-potential Coulometry. The results indicate that the quinones derived from dihydroxybenzoic acids (1a–3a) participate in Michael addition reactions with acetylacetone (4) and via various mechanisms convert to the corresponding benzofurans (1d–3d). In this work, we derive various products with good yields based on electrochemical oxidation under controlled potential conditions in aqueous solutions, without toxic reagents and solvents at a carbon electrode in an undivided cell, using an environmentally friendly method.
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electrochemical oxidation of catechols in the presence of acetylacetone
Journal of Electroanalytical Chemistry, 2004Co-Authors: Davood Nematollahi, Mohammad RafieeAbstract:Electrochemical oxidation of catechols (1a–1c) has been studied in the presence of acetylacetone (3) as a nucleophile in aqueous solutions, using cyclic voltammetry and controlled-potential Coulometry. The results indicate that the quinones derived from catechols (1a–1c) participate in Michael addition reactions with acetylacetone (3) to form the corresponding benzofurans (6a–6c). In this work we have proposed a mechanism for the electrode process. The electrochemical synthesis of benzofurans 6a–6c has been successfully performed at carbon rod electrodes and in an undivided cell.
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A facile electrochemical method for synthesis of new benzofuran derivatives.
The Journal of organic chemistry, 2004Co-Authors: Davood Nematollahi, Davood Habibi, Mohammad Rahmati, Mohammad RafieeAbstract:Electrooxidation of 3-substituted catechols has been studied in the presence of dimedone in aqueous solution, using cyclic voltammetry and controlled-potential Coulometry. The results indicate that the quinones derived from catechols participate in Michael addition reactions with dimedone to form the corresponding benzofuran derivatives (6a−c). We propose a mechanism for the electrode process. The efficient electrochemical synthesis of 6a−c has been performed at carbon rod electrodes in an undivided cell using a constant current.
Mahdi Hesari - One of the best experts on this subject based on the ideXlab platform.
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electrochemical study of iodide in the presence of barbituric acid application to coulometric titration of barbituric acid
Microchemical Journal, 2001Co-Authors: D Nematollahi, Mahdi HesariAbstract:Abstract Electrochemical oxidation of iodide in the presence of barbituric acid has been studied using cyclic voltammetry and controlled-potential Coulometry. The results indicate that the resulting iodine takes part in halogenation reaction and reacts with barbituric acid. According to obtained results, a new coulometric titration method with potentiometric end-point detection for the determination of barbituric acid is presented. In the presented method, 1–200 μmol of barbituric acid was successfully determined.
