The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Gourhari Maiti - One of the best experts on this subject based on the ideXlab platform.
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Antimony Trichloride a mild and efficient reagent for chemoselective ring opening of oxiranes
ChemInform, 2012Co-Authors: Gourhari Maiti, Rudraksha N Bhattacharya, Rajiv KarmakarAbstract:Epoxides are valuable intermediates in organic synthesis as they serve as illogical electrophile and their nucleophilic cleavage leads to 1,2 difunctionalized systems and also because it usually leads to transstereochemistry 1 . Conversion of epoxides to halohydrins had been studied extensively with a variety of reagents like magnesium halides, SnCl2.2H2O, TMSCl, alkylammonium halides, thionyl chloride, zirconyl chloride, etc 2 . Chlorohydrins and other halohydrins gain importance from the fact that they are intermediates in the synthesis of a vast range of biologically active natural and synthetic products, unnatural amino acids and chiral auxiliaries for asymmetric synthesis 3 . They also find application in the synthesis of homochiral β-blockers. Because of these synthetic utilities, a newer, cheap and accessible method for transformation of epoxides to halohydrins is still in demand and a field of active research interest. In continuation of the work on exploring the scope of Antimony Trichloride (SbCl3) as catalyst and reagent in organic transformation 4 , herein is investigated the ring opening of epoxides w ith SbCl3 (Scheme I).
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Antimony Trichloride catalyzed three component reaction of urea aldehydes and cyclic enol ethers a novel route to 4 arylhexahydrofuro 2 3 d pyrimidin 2 3h ones
Tetrahedron Letters, 2011Co-Authors: Rudraksha N Bhattacharya, Pradip Kundu, Gourhari MaitiAbstract:Antimony Trichloride efficiently catalyses diastereoselective three-component reaction of urea, aromatic aldehydes and 2,3-dihydrofuran or 3,4-dihydro-2H-pyran leading to 4-arylhexahydrofuro[2,3-d]pyrimidin-2(3H)-ones and 4-arylhexahydro-1H-pyrano[2,3-d]pyrimidin-2(8aH)-ones, respectively in good yield.
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Antimony Trichloride an efficient and mild catalyst for cyclization of 2 aminochalcones to the corresponding 2 aryl 2 3 dihydroquinolin 4 1h ones
ChemInform, 2010Co-Authors: Rudraksha N Bhattacharya, Pradip Kundu, Gourhari MaitiAbstract:Antimony Trichloride is an efficient catalyst for the cyclization of 2-amino chalcones to the corresponding 2-aryl-2,3-dihydroquinolin-4(1H)-ones under mild reaction conditions and in almost quantitative yields.
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a mild and versatile synthesis of bis indolyl methanes and tris indolyl alkanes catalyzed by Antimony Trichloride
Indian Journal of Chemistry Section B-organic Chemistry Including Medicinal Chemistry, 2008Co-Authors: Pradip Kundu, Gourhari MaitiAbstract:Antimony Trichloride is found to be a mild and efficient catalyst for electrophilic substitution reaction at 3-position of 3-unsubstituted indole derivatives with a variety of carbonyl compounds in acetonitrile to afford the corresponding bis(indolyl)methanes in excellent yields. α, β-Unsaturated carbonyl compounds give tris(indolyl)alkanes under the same reaction conditions. The versatility of this method has been proved with a wide range of aromatic aldehydes with various stereo-electronic factors. This method shows much better selectivity between aldehydes and ketones as well as greater reactivity towards the electron deficient over the electron rich aromatic aldehydes, which are in contrast to the existing methods.
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mild and efficient synthesis of β amino alcohols by Antimony Trichloride catalysed opening of epoxides
Journal of the Indian Chemical Society, 2008Co-Authors: Gourhari Maiti, Pradip Kundu, Asok K MallikAbstract:Nucleophilic opening of epoxides with aniline derivatives in the presence of catalytic amount of Antimony Trichloride in acetonitrile at room temperature afford the corresponding β-amino alcohols in excellent to very good yield.
Yuheng Liu - One of the best experts on this subject based on the ideXlab platform.
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an efficient friedel crafts alkylation of nitrogen heterocycles catalyzed by Antimony Trichloride montmorillonite k 10
Tetrahedron Letters, 2009Co-Authors: Yuheng Liu, Qiushuang Liu, Zhanhui ZhangAbstract:Abstract It has been found that SbCl 3 supported on montmorillonite K-10 is an efficient and reusable catalyst for Friedel–Crafts alkylation of nitrogen heterocycles such as indoles and pyrroles with epoxides. The reaction gives the corresponding C-alkylated derivatives in good to excellent yields with a high regioselectivity.
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efficient conversion of epoxidesinto β hydroperoxy alcohols catalyzed by Antimony Trichloride sio2
Synthesis, 2008Co-Authors: Yuheng Liu, Zhanhui ZhangAbstract:t: Efficient ring-opening of various epoxides with hydrogen peroxide, catalyzed by Antimony trichlonde/SiO 2 , afforded the corresponding β-hydroperoxy alcohols in good to excellent yields under mild reaction conditions. The reactions were efficiently promoted by ultrasound irradiation.
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Antimony Trichloride sio2 promoted synthesis of 9 ary 3 4 5 6 7 9 hexahydroxanthene 1 8 diones
Catalysis Communications, 2008Co-Authors: Zhanhui Zhang, Yuheng LiuAbstract:Abstract Antimony Trichloride absorbed on silica gel (SbCl3/SiO2) has been found to be an efficient catalyst for the synthesis of 9-ary-3,4,5,6,7,9-hexahydroxanthene-1,8-diones by condensation of aromatic aldehydes and 5,5-dimethyl-1,3-cyclohexanedione under solvent-free conditions. The present methodology offers several advantages such as high yields, short reaction times, simple operation and convenient work-up.
Zhanhui Zhang - One of the best experts on this subject based on the ideXlab platform.
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an efficient friedel crafts alkylation of nitrogen heterocycles catalyzed by Antimony Trichloride montmorillonite k 10
Tetrahedron Letters, 2009Co-Authors: Yuheng Liu, Qiushuang Liu, Zhanhui ZhangAbstract:Abstract It has been found that SbCl 3 supported on montmorillonite K-10 is an efficient and reusable catalyst for Friedel–Crafts alkylation of nitrogen heterocycles such as indoles and pyrroles with epoxides. The reaction gives the corresponding C-alkylated derivatives in good to excellent yields with a high regioselectivity.
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efficient conversion of epoxidesinto β hydroperoxy alcohols catalyzed by Antimony Trichloride sio2
Synthesis, 2008Co-Authors: Yuheng Liu, Zhanhui ZhangAbstract:t: Efficient ring-opening of various epoxides with hydrogen peroxide, catalyzed by Antimony trichlonde/SiO 2 , afforded the corresponding β-hydroperoxy alcohols in good to excellent yields under mild reaction conditions. The reactions were efficiently promoted by ultrasound irradiation.
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Antimony Trichloride sio2 promoted synthesis of 9 ary 3 4 5 6 7 9 hexahydroxanthene 1 8 diones
Catalysis Communications, 2008Co-Authors: Zhanhui Zhang, Yuheng LiuAbstract:Abstract Antimony Trichloride absorbed on silica gel (SbCl3/SiO2) has been found to be an efficient catalyst for the synthesis of 9-ary-3,4,5,6,7,9-hexahydroxanthene-1,8-diones by condensation of aromatic aldehydes and 5,5-dimethyl-1,3-cyclohexanedione under solvent-free conditions. The present methodology offers several advantages such as high yields, short reaction times, simple operation and convenient work-up.
Alexey Kondyurin - One of the best experts on this subject based on the ideXlab platform.
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intermolecular interaction of Antimony Trichloride in the crystal of the bimolecular menshutkin complex with diphenylamine
The Journal of Physical Chemistry, 1992Co-Authors: Alexey KondyurinAbstract:The relationship between the change in the constants of intra- and intermolecular force fields of the molecules at the gas-crystal transition is discussed. Raman spectra of the crystal of bimolecular complex (C 6 H 5 ) 2 NH.2SbCl 3 at 293 and 77 K are obtained. Theoretical group and normal coordinate analysis of vibrations in the complex are performed.
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study of molecular dynamics of Antimony Trichloride in some complexes with aromatic hydrocarbons
Journal of Molecular Structure, 1992Co-Authors: Alexey Kondyurin, S N Mikov, A T KozulinAbstract:Abstract The Raman spectra of bimolecular complexes crystals of Antimony Trichloride with benzene, diphenyl and phenanthrene were studied at 77 K. A group theoretical analysis and normal coordinates analysis of the Antimony Trichloride vibrations in complexes was made. The variation of force field with the gas-crystal phase change parameters of intermolecular inter-action was defined. The interpretation of the lattice mode region was accomplished.
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molecular dynamics of Antimony Trichloride in crystals of bimolecular menshutkin complexes with benzene diphenyl and phenanthrene by raman spectroscopy
Journal of Raman Spectroscopy, 1991Co-Authors: Alexey Kondyurin, S N Mikov, A T KozulinAbstract:The Raman spectra of bimolecular complexes crystals of Antimony Trichloride with benzene, diphenyl and phenanthrene were studied at 77 K. A group theoretical analysis and normal coordinates analysis of the Antimony Trichloride vibrations in complexes was made. The variation of force field with the gas-crystal phase change parameters of intermolecular interaction was defined. The interpretation of the lattice mode region was accomplished.
A T Kozulin - One of the best experts on this subject based on the ideXlab platform.
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study of molecular dynamics of Antimony Trichloride in some complexes with aromatic hydrocarbons
Journal of Molecular Structure, 1992Co-Authors: Alexey Kondyurin, S N Mikov, A T KozulinAbstract:Abstract The Raman spectra of bimolecular complexes crystals of Antimony Trichloride with benzene, diphenyl and phenanthrene were studied at 77 K. A group theoretical analysis and normal coordinates analysis of the Antimony Trichloride vibrations in complexes was made. The variation of force field with the gas-crystal phase change parameters of intermolecular inter-action was defined. The interpretation of the lattice mode region was accomplished.
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molecular dynamics of Antimony Trichloride in crystals of bimolecular menshutkin complexes with benzene diphenyl and phenanthrene by raman spectroscopy
Journal of Raman Spectroscopy, 1991Co-Authors: Alexey Kondyurin, S N Mikov, A T KozulinAbstract:The Raman spectra of bimolecular complexes crystals of Antimony Trichloride with benzene, diphenyl and phenanthrene were studied at 77 K. A group theoretical analysis and normal coordinates analysis of the Antimony Trichloride vibrations in complexes was made. The variation of force field with the gas-crystal phase change parameters of intermolecular interaction was defined. The interpretation of the lattice mode region was accomplished.