The Experts below are selected from a list of 4248 Experts worldwide ranked by ideXlab platform
Malik Abdul Rub - One of the best experts on this subject based on the ideXlab platform.
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study of metal amino acid cr iii trp 2 complex and Ninhydrin reaction role of gemini micellar solution on rate constant
Molecular Physics, 2020Co-Authors: Malik Abdul Rub, Dileep Kumar, Abdullah M Asiri, Yousef Gamaan AlghamdiAbstract:In this article, the study of metal-amino acid complex and Ninhydrin reaction was examined in gemini micellar solution using a UV-visible spectrophotometric measurement. The role of varying amounts...
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study of reaction rate between zinc ii histidine zn ii his complex and Ninhydrin effect of three dicationic gemini alkanediyl α ω type surfactants
Industrial & Engineering Chemistry Research, 2020Co-Authors: Dileep Kumar, Malik Abdul RubAbstract:Study of rate between Zn(II)-histidine and Ninhydrin in three dicationic gemini (alkanediyl-α,ω-type) surfactants has been investigated at temperature (343 K) by spectroscopic method. The order of ...
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study of zinc glycylglycine complex with Ninhydrin in aqueous and cationic micellar media a spectrophotometric technique
Tenside Surfactants Detergents, 2019Co-Authors: Dileep Kumar, Malik Abdul RubAbstract:Abstract Studies of the interaction between the zinc-peptide complex ([Zn(II)-Gly-Gly]+) and Ninhydrin in aqueous and CTAB surfactant media were executed by the means of UV-visible spectrophotometr...
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role of cetyltrimethylammonium bromide ctab surfactant micelles on kinetics of zn ii gly leu and Ninhydrin
Journal of Molecular Liquids, 2019Co-Authors: Dileep Kumar, Malik Abdul RubAbstract:Abstract At present work, role of cetyltrimethylammonium bromide (CTAB) surfactant micelles on kinetics of zinc-glycylleucine [Zn(II)-Gly-Leu]+ and Ninhydrin has been studied. The effect of different variables, viz., Ninhydrin, [Zn(II)-Gly-Leu]+ complex, temperature and pH was also undertaken on the title reaction. Role of CTAB on kinetics of complex and Ninhydrin has been carried out using spectrophotometric technique. CTAB was observed more efficient for the [Zn(II)-Gly-Leu]+ and Ninhydrin reaction than aqueous. The rate constant kψ-values enhanced with increase in [CTAB] from 0 to 50 mol dm−3 and further increase has a slow decrease in rate. Conductometric technique was used to evaluate critical micelle concentration (cmc) of surfactant. The relationship of rate constant (kψ) with CTAB concentration was discussed and described in sufficient details. Analysis of kinetic data was rationalized in terms of model of surfactant micelles (pseudo-phase). Various parameters have also been evaluated including thermodynamic and binding constant.
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Studies of interaction between Ninhydrin and Gly-Leu dipeptide: Influence of cationic surfactants (m-s-m type Gemini)
Journal of Molecular Liquids, 2018Co-Authors: Dileep Kumar, Malik Abdul RubAbstract:Abstract Herein, we have reported the studies of interaction between Ninhydrin and glycylleucine (Gly-Leu) dipeptide in cationic Gemini surfactants (m-s-m; m = 16; s = 4, 5, 6) by using spectrophotometric technique. The rate constant values, kψ, were determined at different temperatures and pH. The effect of concentration of reactants and surfactants was also carried out on the title reaction. It was also observed that the reaction was accelerated and catalyzed by 16-s-16 Gemini surfactants even at low critical micelle concentration (cmc) value of surfactants. The variation of Gemini surfactants on the reaction of Ninhydrin with glycylleucine has been analyzed with the help pseudo-phase model of surfactants proposed by Menger and Portnoy and developed by Bunton. The binding constants for reactants (Ninhydrin and Gly-Leu) have been computed using a computer based program.
Dileep Kumar - One of the best experts on this subject based on the ideXlab platform.
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study of metal amino acid cr iii trp 2 complex and Ninhydrin reaction role of gemini micellar solution on rate constant
Molecular Physics, 2020Co-Authors: Malik Abdul Rub, Dileep Kumar, Abdullah M Asiri, Yousef Gamaan AlghamdiAbstract:In this article, the study of metal-amino acid complex and Ninhydrin reaction was examined in gemini micellar solution using a UV-visible spectrophotometric measurement. The role of varying amounts...
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study of reaction rate between zinc ii histidine zn ii his complex and Ninhydrin effect of three dicationic gemini alkanediyl α ω type surfactants
Industrial & Engineering Chemistry Research, 2020Co-Authors: Dileep Kumar, Malik Abdul RubAbstract:Study of rate between Zn(II)-histidine and Ninhydrin in three dicationic gemini (alkanediyl-α,ω-type) surfactants has been investigated at temperature (343 K) by spectroscopic method. The order of ...
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study of zinc glycylglycine complex with Ninhydrin in aqueous and cationic micellar media a spectrophotometric technique
Tenside Surfactants Detergents, 2019Co-Authors: Dileep Kumar, Malik Abdul RubAbstract:Abstract Studies of the interaction between the zinc-peptide complex ([Zn(II)-Gly-Gly]+) and Ninhydrin in aqueous and CTAB surfactant media were executed by the means of UV-visible spectrophotometr...
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role of cetyltrimethylammonium bromide ctab surfactant micelles on kinetics of zn ii gly leu and Ninhydrin
Journal of Molecular Liquids, 2019Co-Authors: Dileep Kumar, Malik Abdul RubAbstract:Abstract At present work, role of cetyltrimethylammonium bromide (CTAB) surfactant micelles on kinetics of zinc-glycylleucine [Zn(II)-Gly-Leu]+ and Ninhydrin has been studied. The effect of different variables, viz., Ninhydrin, [Zn(II)-Gly-Leu]+ complex, temperature and pH was also undertaken on the title reaction. Role of CTAB on kinetics of complex and Ninhydrin has been carried out using spectrophotometric technique. CTAB was observed more efficient for the [Zn(II)-Gly-Leu]+ and Ninhydrin reaction than aqueous. The rate constant kψ-values enhanced with increase in [CTAB] from 0 to 50 mol dm−3 and further increase has a slow decrease in rate. Conductometric technique was used to evaluate critical micelle concentration (cmc) of surfactant. The relationship of rate constant (kψ) with CTAB concentration was discussed and described in sufficient details. Analysis of kinetic data was rationalized in terms of model of surfactant micelles (pseudo-phase). Various parameters have also been evaluated including thermodynamic and binding constant.
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Studies of interaction between Ninhydrin and Gly-Leu dipeptide: Influence of cationic surfactants (m-s-m type Gemini)
Journal of Molecular Liquids, 2018Co-Authors: Dileep Kumar, Malik Abdul RubAbstract:Abstract Herein, we have reported the studies of interaction between Ninhydrin and glycylleucine (Gly-Leu) dipeptide in cationic Gemini surfactants (m-s-m; m = 16; s = 4, 5, 6) by using spectrophotometric technique. The rate constant values, kψ, were determined at different temperatures and pH. The effect of concentration of reactants and surfactants was also carried out on the title reaction. It was also observed that the reaction was accelerated and catalyzed by 16-s-16 Gemini surfactants even at low critical micelle concentration (cmc) value of surfactants. The variation of Gemini surfactants on the reaction of Ninhydrin with glycylleucine has been analyzed with the help pseudo-phase model of surfactants proposed by Menger and Portnoy and developed by Bunton. The binding constants for reactants (Ninhydrin and Gly-Leu) have been computed using a computer based program.
Animesh Pramanik - One of the best experts on this subject based on the ideXlab platform.
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a new and efficient synthesis of pyrazole fused isocoumarins on the solid surface of magnetically separable fe 3 o 4 sio 2 so 3 h nanoparticles
Tetrahedron Letters, 2016Co-Authors: Sayan Mukherjee, Ashis Kundu, Animesh PramanikAbstract:Abstract A new and efficient procedure has been developed for the synthesis of a series of pyrazole-fused isocoumarins from easily available Ninhydrin and arylhydrazones. In this synthesis the condensations of Ninhydrin and arylhydrazones are carried out under solvent free conditions employing magnetically separable Fe3O4@SiO2-SO3H nanoparticles as solid acid support. Some members of pyrazole-fused isocoumarins are known to bind to a GABA receptor.
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facile synthesis of Ninhydrin and isatin based hydrazones in water using peg oso3h as a highly efficient and homogeneous polymeric acid surfactant combined catalyst
ChemInform, 2013Co-Authors: Kamalesh Debnath, Sudipta Pathak, Animesh PramanikAbstract:Title compounds (III) and (V) are synthesized via reaction of Ninhydrin (I) and isatin (IV) with the novel carbazate (II).
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facile synthesis of Ninhydrin and isatin based hydrazones in water using peg oso3h as a highly efficient and homogeneous polymeric acid surfactant combined catalyst
Tetrahedron Letters, 2013Co-Authors: Kamalesh Debnath, Sudipta Pathak, Animesh PramanikAbstract:Abstract The synthesis of a series of biologically important Ninhydrin and isatin based hydrazones has been carried out by refluxing easily synthesized novel N ′-(chloro-aryl-methylene)- tert -butylcarbazates with Ninhydrin and isatins in the presence of PEG-OSO 3 H as catalyst in water medium. The dual characteristic of PEG-OSO 3 H as a Bronsted acid as well as a phase-transfer catalyst is successfully exploited in this synthesis. Reduced reaction time, operational simplicity, excellent yields of the products with high purity, and more importantly, easy recoverability, and reusability of the homogeneous polymeric catalyst make the reaction an attractive, economic, and sustainable green synthetic methodology.
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facile synthesis of substituted pyrrole fused isocoumarins from Ninhydrin
ChemInform, 2012Co-Authors: Sudipta Pathak, Ashis Kundu, Animesh PramanikAbstract:The route involves the stepwise condensation of acetylacetone with amines and Ninhydrin followed by acid-catalyzed rearrangement.
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Facile synthesis of substituted pyrrole-fused isocoumarins from Ninhydrin
Tetrahedron Letters, 2011Co-Authors: Sudipta Pathak, Ashis Kundu, Animesh PramanikAbstract:A simple and efficient procedure has been developed for the synthesis of substituted pyrrole-fused isocoumarins from easily available Ninhydrin. The cyclic hemiaminal dihydroxy-indenopyrroles, the adducts of Ninhydrin with enamines of acetylacetone, give pyrrole-fused isocoumarins upon heating in acidic medium. The process constitutes an interesting acid-catalyzed rearrangement to eight-membered lactams followed by intramolecular cyclization involving the amino and keto groups.
Sudipta Pathak - One of the best experts on this subject based on the ideXlab platform.
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facile synthesis of Ninhydrin and isatin based hydrazones in water using peg oso3h as a highly efficient and homogeneous polymeric acid surfactant combined catalyst
ChemInform, 2013Co-Authors: Kamalesh Debnath, Sudipta Pathak, Animesh PramanikAbstract:Title compounds (III) and (V) are synthesized via reaction of Ninhydrin (I) and isatin (IV) with the novel carbazate (II).
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facile synthesis of Ninhydrin and isatin based hydrazones in water using peg oso3h as a highly efficient and homogeneous polymeric acid surfactant combined catalyst
Tetrahedron Letters, 2013Co-Authors: Kamalesh Debnath, Sudipta Pathak, Animesh PramanikAbstract:Abstract The synthesis of a series of biologically important Ninhydrin and isatin based hydrazones has been carried out by refluxing easily synthesized novel N ′-(chloro-aryl-methylene)- tert -butylcarbazates with Ninhydrin and isatins in the presence of PEG-OSO 3 H as catalyst in water medium. The dual characteristic of PEG-OSO 3 H as a Bronsted acid as well as a phase-transfer catalyst is successfully exploited in this synthesis. Reduced reaction time, operational simplicity, excellent yields of the products with high purity, and more importantly, easy recoverability, and reusability of the homogeneous polymeric catalyst make the reaction an attractive, economic, and sustainable green synthetic methodology.
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facile synthesis of substituted pyrrole fused isocoumarins from Ninhydrin
ChemInform, 2012Co-Authors: Sudipta Pathak, Ashis Kundu, Animesh PramanikAbstract:The route involves the stepwise condensation of acetylacetone with amines and Ninhydrin followed by acid-catalyzed rearrangement.
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Facile synthesis of substituted pyrrole-fused isocoumarins from Ninhydrin
Tetrahedron Letters, 2011Co-Authors: Sudipta Pathak, Ashis Kundu, Animesh PramanikAbstract:A simple and efficient procedure has been developed for the synthesis of substituted pyrrole-fused isocoumarins from easily available Ninhydrin. The cyclic hemiaminal dihydroxy-indenopyrroles, the adducts of Ninhydrin with enamines of acetylacetone, give pyrrole-fused isocoumarins upon heating in acidic medium. The process constitutes an interesting acid-catalyzed rearrangement to eight-membered lactams followed by intramolecular cyclization involving the amino and keto groups.
Pravin R. Likhar - One of the best experts on this subject based on the ideXlab platform.
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synthesis of new spiro pyrrole pyrrolizine thiazole derivatives via 3 2 cycloaddition reactions
New Journal of Chemistry, 2018Co-Authors: Prakash R Mali, Navnath B Khomane, Pravin R. Likhar, Harshadas Mitaram Meshram, B SridharAbstract:A new series of spiro pyrrole/pyrrolizine/thiazole compounds have been synthesized using (3+2) dipolar cycloaddition via three-component condensation reactions of Ninhydrin and α-amino acids with different dipolarophiles such as maleimide, malic anhydride, 2-benzyl-2-methylcyclopent-4-ene-1,3-dione and isothiocyanates. Another four-component protocol has been developed in which Ninhydrin, proline, maleimide and phenacyl bromides are reacted to afford a novel library of pyrrolizine derivatives in good yields without the use of catalyst.
