The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Asok K Mallik - One of the best experts on this subject based on the ideXlab platform.
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synthesis of flavanones by use of anhydrous potassium carbonate as an inexpensive safe and efficient basic catalyst
ChemInform, 2012Co-Authors: Rina Mondal, Arpita Das Gupta, Asok K MallikAbstract:The synthesis of the target compounds can be achieved from 2′-hydroxychalcones or from an equimolar mixture of 2-Hydroxyacetophenones and aromatic aldehydes.
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synthesis of flavanones by use of anhydrous potassium carbonate as an inexpensive safe and efficient basic catalyst
Tetrahedron Letters, 2011Co-Authors: Rina Mondal, Arpita Das Gupta, Asok K MallikAbstract:Abstract Anhydrous potassium carbonate has been utilized as an inexpensive, safe, and efficient basic catalyst for the synthesis of flavanones starting either from 2′-hydroxychalcones or from 2′-hydroxyacetophenones. In both the cases the favored reaction condition was either refluxing in a solvent with added catalyst or microwave irradiation on the catalyst.
Periasamy Viswanathamurthi - One of the best experts on this subject based on the ideXlab platform.
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new ruthenium ii carbonyl complexes bearing disulfide schiff base ligands and their applications as catalyst for some organic transformations
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014Co-Authors: Govindan Prakash, Periasamy ViswanathamurthiAbstract:Abstract Schiff base disulfide ligands (H2L1−6) were synthesized from the condensation of cystamine with salicylaldehyde(H2L1), 5-chlorosalicylaldehyde(H2L2), o-vanillin(H2L3), 2-Hydroxyacetophenone(H2L4), 3-methyl-2-Hydroxyacetophenone(H2L5), and 2-hydroxy-1-naphthaldehyde(H2L6). H2L1−6 reacts with the ruthenium precursor complex [RuHCl(CO)(PPh3)3] in benzene giving rise to six new ruthenium(II) complexes of general formula [Ru(CO)L1−6]. Characterization of the new complexes was carried out by using elemental and spectral (IR, UV–Vis, NMR (1H and 13C) and Mass) techniques. An octahedral geometry was assigned for all the complexes based on the spectral data obtained. The catalytic efficiency of the new complexes in aldehyde to amide conversion in the presence of NaHCO3, N-alkylation of aniline in the presence of t-BuOK, and transfer hydrogenation of ketones in the presence of iPrOH/KOH reactions were studied. Furthermore, the effect of solvents and catalyst/substrate ratio on the catalytic aldehyde to amide conversion were also discussed.
Mohan M. Patel - One of the best experts on this subject based on the ideXlab platform.
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Synthesis, characterization and thermal studies of polychelates derived from 2-Hydroxyacetophenone-thiourea-trioxane resin
Thermochimica Acta, 1992Co-Authors: Hemendra B. Pancholi, Mohan M. PatelAbstract:Abstract Polychelates of copper(II), nickel(II), cobalt(II), manganese(II), zinc(II), oxovanadium(IV) and dioxouranium(VI) with 2-Hydroxyacetophenone-thiourea-trioxane resin have been synthesized. Elemental analyses of the polychelates indicate 1:2 (metal:ligand) ratio. The structures of the polychelates have been assigned on the basis of their elemental analyses, IR and reflectance spectra and magnetic measurements. Thermal studies of polychelates have been carried out to determine their mode of decomposition, apparent activation energy and the order of each thermal reaction. Electrical conductivity behaviour of resin and its polychelates has also been studied.
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2-Hydroxyacetophenone-thiourea-trioxane resins and their thermal studies
Thermochimica Acta, 1992Co-Authors: Hemendra B. Pancholi, Mohan M. PatelAbstract:Abstract Resins have been synthesised by the condensation of 2-Hydroxyacetophenone (HA) with thiourea (T) and trioxane (T') in the presence of 2 M HCl/H 2 SO 4 as a catalyst, with varying molar proportions of the reactants. The resins were characterised by elemental analyses, IR spectral study, number-average molecular weights and viscosity. Thermal studies of the resins have been carried out to determine their mode of decomposition, apparent activation energy and the order of each thermal reaction.
Rina Mondal - One of the best experts on this subject based on the ideXlab platform.
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synthesis of flavanones by use of anhydrous potassium carbonate as an inexpensive safe and efficient basic catalyst
ChemInform, 2012Co-Authors: Rina Mondal, Arpita Das Gupta, Asok K MallikAbstract:The synthesis of the target compounds can be achieved from 2′-hydroxychalcones or from an equimolar mixture of 2-Hydroxyacetophenones and aromatic aldehydes.
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synthesis of flavanones by use of anhydrous potassium carbonate as an inexpensive safe and efficient basic catalyst
Tetrahedron Letters, 2011Co-Authors: Rina Mondal, Arpita Das Gupta, Asok K MallikAbstract:Abstract Anhydrous potassium carbonate has been utilized as an inexpensive, safe, and efficient basic catalyst for the synthesis of flavanones starting either from 2′-hydroxychalcones or from 2′-hydroxyacetophenones. In both the cases the favored reaction condition was either refluxing in a solvent with added catalyst or microwave irradiation on the catalyst.
Douglas X. West - One of the best experts on this subject based on the ideXlab platform.
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Copper(II) and nickel(II) complexes of 5-methyl-2-Hydroxyacetophenone N(4)-substituted thiosemicarbazones
Polyhedron, 2003Co-Authors: Elena Labisbal, Kristin D Haslow, Antonio Sousa-pedrares, Jesús Valdés-martínez, Simón Hernández-ortega, Douglas X. WestAbstract:Abstract Mononuclear and binuclear copper(II) and nickel(II) complexes with 5-methyl-2-Hydroxyacetophenone N(4)-substituted thiosemicarbazones have been prepared and characterized. IR and 1H NMR spectra of the N(4)-substituted thiosemicarbazones and their metal complexes, as well as ESR spectra of the mononuclear copper(II) complexes, have been obtained. The crystal structures of 5-methyl-2-Hydroxyacetophenone N(4)-dimethylthiosemicarbazone and a representative binuclear copper(II) complex have been acquired, and their structural features are compared to related thiosemicarbazones and previously reported binuclear copper(II) thiosemicarbazone complexes.
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Synthesis, solution and spectral studies of palladium(II) complexes with 2-Hydroxyacetophenone N(3)-propylthiosemicarbazone. Crystal structure of a tripalladium complex
Inorganica Chimica Acta, 2002Co-Authors: Paras N. Yadav, Mavroudis A. Demertzis, Dimitra Kovala-demertzi, Alfonso Castiñeiras, Douglas X. WestAbstract:Abstract The reactions of palladium(II) salts with 2-Hydroxyacetophenone N(3)-propylthiosemicarbazone, H 2 Ap3Pr, are described. The synthesis and spectral characterization of a new triangular , trinuclear palladium(II) complex with the dianion, Ap3Pr 2− , are reported. The X-ray crystal structure determination of [Pd(Ap3Pr 2 )] 3 ·DMF shows it to contain a chair-form hexagon of alternating Pd and S atoms to form a molecular bowl. The spectrophotometric characterization of H 2 Ap3Pr is also reported.
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Binuclear copper(II) complexes of 2-Hydroxyacetophenone 4N-substituted thiosemicarbazones
Polyhedron, 1995Co-Authors: Douglas X. West, Jesús Valdés-martínez, Yonghong Yang, Tracey L. Klein, Karen I. Goldberg, Anthony E. Liberta, Rubén A. ToscanoAbstract:Abstract Binuclear copper(II) complexes with eight different 2-Hydroxyacetophenone 4N-substituted thiosemicarbazones have been prepared and characterized. IR, electronic, 1H NMR and ESR spectra of the complexes, as well as IR, UV and 1H NMR spectra of the thiosemicarbonazones, have been obtained. The crystal structure for the copper(II) complex of 2-Hydroxyacetophenone 3-hexamethyleneiminylthiosemicarbazone, [Cu(Aphexim)]2, has been solved and its structural properties are compared to a recently reported nickel(II) complex. Both the thiosemicarbazones and their copper(II) complexes show no growth inhibitory activity against Aspergillus niger, but many have considerable activity against Paecilomyces variotii. Further, there is a relationship between the antifungal activity and the size of the 4N substituent for both the thiosemicarbazones and their copper(II) complexes.
