The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform
Iqbal M Choudhary - One of the best experts on this subject based on the ideXlab platform.
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an expedient esterification of aromatic carboxylic acids using Sodium Bromate and Sodium hydrogen sulfite
Tetrahedron, 2003Co-Authors: Khalid Mohammed Khan, Ghulam M Maharvi, Safdar Hayat, Iqbal M ChoudharyAbstract:Abstract Treatment of aromatic carboxylic acids and substituted toluenes with a mixture of Sodium Bromate and Sodium hydrogen sulfite in a two-phase system gave the corresponding esters in good yield. The intermediate α-brominated toluene was formed by the in situ generated hypobromous acid. The α-bromotoluene underwent an intermolecular nucleophilic substitution reaction with aromatic carboxylic acids present in the reaction mixture to afford the corresponding esters.
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an improved method for the synthesis of γ lactones using Sodium Bromate and Sodium hydrogen sulfite
Tetrahedron Letters, 2001Co-Authors: Safdar Hayat, Khalid Mohammed Khan, Iqbal M Choudhary, Ernst BayerAbstract:o-Alkylbenzenecarboxylic acids are treated with a Sodium Bromate and Sodium hydrogen sulfite reagent under a two-phase system using ethyl acetate as solvent, under mild conditions to give the corresponding cyclized phthalides in moderate to satisfactory yield. Intermediately the α-brominated alkylbenzenecarboxylic acids are formed by the in situ generated hypobromous acid. These α-brominated acids undergo an intramolecular nucleophilic substitution reaction to afford the corresponding γ-lactones.
Khalid Mohammed Khan - One of the best experts on this subject based on the ideXlab platform.
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An efficient synthesis of substituted bis(indolyl)methanes using Sodium Bromate and Sodium hydrogen sulfite in water
Journal of the Iranian Chemical Society, 2012Co-Authors: Khalid Mohammed Khan, Muhammad Taha, Fazal Rahim, Waqas Jamil, Shahnaz Perveen, Muhammad Iqbal ChoudharyAbstract:Treatment of indole with substituted aldehyde in the presence of equimolar amount of Sodium Bromate and Sodium hydrogen sulfite mixture in water yielded corresponding substituted bis(indolyl)methanes in good yields. This provides a facile and environmentally friendly method towards the synthesis of an important class of organic compounds.
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an expedient esterification of aromatic carboxylic acids using Sodium Bromate and Sodium hydrogen sulfite
Tetrahedron, 2003Co-Authors: Khalid Mohammed Khan, Ghulam M Maharvi, Safdar Hayat, Iqbal M ChoudharyAbstract:Abstract Treatment of aromatic carboxylic acids and substituted toluenes with a mixture of Sodium Bromate and Sodium hydrogen sulfite in a two-phase system gave the corresponding esters in good yield. The intermediate α-brominated toluene was formed by the in situ generated hypobromous acid. The α-bromotoluene underwent an intermolecular nucleophilic substitution reaction with aromatic carboxylic acids present in the reaction mixture to afford the corresponding esters.
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an improved method for the synthesis of γ lactones using Sodium Bromate and Sodium hydrogen sulfite
Tetrahedron Letters, 2001Co-Authors: Safdar Hayat, Khalid Mohammed Khan, Iqbal M Choudhary, Ernst BayerAbstract:o-Alkylbenzenecarboxylic acids are treated with a Sodium Bromate and Sodium hydrogen sulfite reagent under a two-phase system using ethyl acetate as solvent, under mild conditions to give the corresponding cyclized phthalides in moderate to satisfactory yield. Intermediately the α-brominated alkylbenzenecarboxylic acids are formed by the in situ generated hypobromous acid. These α-brominated acids undergo an intramolecular nucleophilic substitution reaction to afford the corresponding γ-lactones.
Safdar Hayat - One of the best experts on this subject based on the ideXlab platform.
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an expedient esterification of aromatic carboxylic acids using Sodium Bromate and Sodium hydrogen sulfite
Tetrahedron, 2003Co-Authors: Khalid Mohammed Khan, Ghulam M Maharvi, Safdar Hayat, Iqbal M ChoudharyAbstract:Abstract Treatment of aromatic carboxylic acids and substituted toluenes with a mixture of Sodium Bromate and Sodium hydrogen sulfite in a two-phase system gave the corresponding esters in good yield. The intermediate α-brominated toluene was formed by the in situ generated hypobromous acid. The α-bromotoluene underwent an intermolecular nucleophilic substitution reaction with aromatic carboxylic acids present in the reaction mixture to afford the corresponding esters.
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an improved method for the synthesis of γ lactones using Sodium Bromate and Sodium hydrogen sulfite
Tetrahedron Letters, 2001Co-Authors: Safdar Hayat, Khalid Mohammed Khan, Iqbal M Choudhary, Ernst BayerAbstract:o-Alkylbenzenecarboxylic acids are treated with a Sodium Bromate and Sodium hydrogen sulfite reagent under a two-phase system using ethyl acetate as solvent, under mild conditions to give the corresponding cyclized phthalides in moderate to satisfactory yield. Intermediately the α-brominated alkylbenzenecarboxylic acids are formed by the in situ generated hypobromous acid. These α-brominated acids undergo an intramolecular nucleophilic substitution reaction to afford the corresponding γ-lactones.
Ernst Bayer - One of the best experts on this subject based on the ideXlab platform.
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an improved method for the synthesis of γ lactones using Sodium Bromate and Sodium hydrogen sulfite
Tetrahedron Letters, 2001Co-Authors: Safdar Hayat, Khalid Mohammed Khan, Iqbal M Choudhary, Ernst BayerAbstract:o-Alkylbenzenecarboxylic acids are treated with a Sodium Bromate and Sodium hydrogen sulfite reagent under a two-phase system using ethyl acetate as solvent, under mild conditions to give the corresponding cyclized phthalides in moderate to satisfactory yield. Intermediately the α-brominated alkylbenzenecarboxylic acids are formed by the in situ generated hypobromous acid. These α-brominated acids undergo an intramolecular nucleophilic substitution reaction to afford the corresponding γ-lactones.
Daisamma P Jacob - One of the best experts on this subject based on the ideXlab platform.
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the effect of doping on the thermal decomposition of Sodium Bromate
Thermochimica Acta, 1991Co-Authors: S. M. K. Nair, Daisamma P JacobAbstract:Abstract The thermal decomposition of Sodium Bromate doped with potassium Bromate and Sodium bromide, each in the mole fraction range 10 −4 −10 −1 , was studied by thermogravimetry. The activation energy, frequency factor and entropy of activation were computed using the Coats-Redfern, Freeman-Carroll and Horowitz-Metzger methods. Doping enhances the decomposition and decreases the energy of activation, the effect increasing with increase in concentration of the dopant. The mechanism of decomposition follows the Avrami equation, 1 − (1 − α) 1 3 = kt , and the rate-controlling process is a phase-boundary reaction assuming spherical symmetry.
