BITS Faculty Publications
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Item Ytterbium(III) Triflate-Catalyzed Conversion of Carbonyl Compounds into 1,3-Oxathiolanes in Ionic Liquids(Thieme, 2004) Kumar, AnilThe reaction of carbonyl compounds with 2-mercaptoethanol to prepare 1,3-oxathiolanes has been successfully carried out in ionic liquids using ytterbium(III) triflate as a catalyst. Yields of the products are high and the catalyst can be easily recovered and reused in this reaction.Item 1-Methyl-3-butylimidazolium Decatungstate in Ionic Liquid: An Efficient Catalyst for the Oxidation of Alcohols(Thieme, 2005) Kumar, AnilAn excellent system for the selective oxidation of benzylic and secondary alcohols with hydrogen peroxide catalyzed by 1-methyl-3-butylimidazolium decatungstate in [bmim][BF4] ionic liquid is described. The catalytic system is reusable and products are obtained in excellent yield under environmentally benign conditions.Item ChemInform Abstract: An Efficient and Simple One-Pot Synthesis of β-Acetamido Ketones Catalyzed by Ytterbium Triflate in Ionic Liquid(Wiley, 2009-09) Khungar, Bharti; Kumar, AnilChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.Item A simple and facile synthesis of amidoalkyl naphthols catalyzed by Yb(OTf)3 in ionic liquids(CSP, 2009-05-23) Khungar, Bharti; Kumar, AnilAn improved, simple, and facile synthesis of amidoalkyl naphthols by employing three-component one-pot condensation reaction of β-naphthol, aromatic aldehydes, and amides in ionic liquids using ytterbium triflate as a mild Lewis acid catalyst is described. Advantageously, amidoalkyl naphthols were obtained in high yield under eco-friendly, economical, and non-corrosive conditions, and the catalyst was recycled.Item Biomimetic Reduction of Nimesulide with NaBH4 Catalyzed by Metalloporphyrins(J-Stage, 2002) Kumar, AnilThe biomimetic reduction of anti-inflammatory drug, nimesulide (1) with sodium borohydride catalyzed by 5,10,15,20-tetraarylporphyrinatoiron(III) chlorides [TAPFe(III)Cl] has been studied in organic solvents under anaerobic and aerobic conditions.Item Deprotection of 1,3-oxathiolanes to carbonyl compounds with montmorillonite K10(NISCAIR, 2003) Kumar, AnilMontmorillonite K10 has been used in the deprotection of different aromatic and aliphatic 1,3-oxathiolanes to the corresponding carbonyl compounds in 73 to 97% yields under mild and environmentally compatible conditions.Item Copper (I) Chloride Catalyzed Synthesis of Diaryl Ethers in Ionic Liquids Under Mild Conditions(Taylor & Francis, 2003) Kumar, AnilThe reaction of different aryl halides with aryl oxides catalyzed by CuCl in 1-butyl-3-methyl-imidazolium tetrafluoroborate [bmim][BF4] and 1-butyl-3-methyl-imidazolium hexafluorophosphate [bmim][PF6] ionic liquids to give diaryl ethers in 54–90% yields has been studied under mild reaction conditions.Item Biomimetic Oxidation of Curcumin with Hydrogen Peroxide Catalyzed by 5,10,15,20-Tetraarylporphyrinatoiron(III) Chlorides in Dichloromethane(J-Stage, 2003) Kumar, AnilThe biomimetic oxidation of curcumin, a main turmeric pigment with hydrogen peroxide catalyzed by different 5,10,15,20-tetraarylporphyrinatoiron(III) chlorides [TAPFe(III)Cl] in dichloromethane has been studied to give a C–C coupled curcumin dimer in 40—70% yield. The structure of the dimer has been elucidated by 1H-, 13C-NMR, IR and FAB-Mass spectroscopic data.Item Oxidation of thiols with molecular oxygen catalyzed by cobalt(ii) phthalocyanines in ionic liquid(RSC, 2003) Kumar, AnilAn efficient procedure for catalyst solubility, recycling and easy product isolation in oxidation of thiols to disulfides with molecular oxygen catalyzed by cobalt(II) phthalocyanines dissolved in ionic liquid at room temperature is reported.Item Effect of side chain length on the aggregation of amphiphilic 5,10,15-tris (1-methylpyridinium-4-yl)-20-[4-(alkoxy) phenyl] 21H, 23H porphyrin tritosylates(NISCAIR, 2003-12) Kumar, AnilSelf-aggregation of cationic amphiphilic 5, 10, 15-tris-(1-methylpyridinium-4-yl)-20-[4-(alkoxy)phenyl]-21H, 23H porphyrin tritosylates (2a-e) with different alkoxy chain length in aqueous and binary solvent systems has been studied by UV-visible, fluorescence and 1H NMR spectroscopy. Binary solvent, concentration, ionic strength, presence of surfactants, and temperature govern the aggregations of 2a-e. Porphyrins having side chain length more than ten carbon atoms (2c-e) form higher aggregates, such as vesicles by sonication of dimers formed initially, whereas porphyrins with lesser side chain length (2a & b) form lower aggregates only. Further, the size and the formation of vesicles have been confirmed by transmission electron microscopy (TEM) and dye entrapment experiments for 2e