32018-42-1Relevant academic research and scientific papers
Fe3O4/PEG-SO3H as a heterogeneous and magnetically-recyclable nanocatalyst for the oxidation of sulfides to sulfones or sulfoxides
Mirfakhraei, Saeideh,Hekmati, Malak,Eshbala, Fereshteh Hosseini,Veisi, Hojat
, p. 1757 - 1761 (2018/02/09)
We present below a sulfonated-polyethylene glycol-coated Fe3O4 nanocomposite (Fe3O4/PEG-SO3H) as a greatly effective and ecological nanocatalyst for the selective oxidation of sulfides to sulfoxides or sulfones with brilliant yields under solvent-free conditions by employing 30% hydrogen peroxide as the oxidant. A number of sulfides containing alcohol, ester, and aldehyde functional groups were fruitfully and selectively oxidized without altering the desired characteristics. The magnetic nanocatalyst (Fe3O4/PEG-SO3H) can be conveniently and swiftly retrieved through the utilization of an external magnetic tool and recycled for more than 10 reaction runs without significantly decreasing its catalytic behavior.
Copper-Schiff base complex catalyzed oxidation of sulfides with hydrogen peroxide
Gogoi, Prasanta,Kalita, Mukul,Bhattacharjee, Tirtha,Barman, Pranjit
, p. 1028 - 1030 (2014/02/14)
A straightforward, efficient, and selective oxidation of sulfide to sulfoxide with 30% H2O2 catalyzed by copper(II)-Schiff base complex is described. The reactions proceed under mild conditions in acetonitrile at room temperature to provide a variety of aryl and alkyl sulfoxides in excellent yield.
Copper-Schiff base complex catalyzed oxidation of sulfides with hydrogen peroxide
Gogoi, Prasanta,Kalita, Mukul,Bhattacharjee, Tirtha,Barman, Pranjit
supporting information, p. 1028 - 1030 (2015/02/05)
A straightforward, efficient, and selective oxidation of sulfide to sulfoxide with 30% H2O2 catalyzed by copper(II)-Schiff base complex is described. The reactions proceed under mild conditions in acetonitrile at room temperature to provide a variety of aryl and alkyl sulfoxides in excellent yield.
A new series of Ni(II), Cu(II), Co(II) and Pd(II) complexes with an ONS donor Schiff base: Synthesis, crystal structure, catalytic properties and bioactivities
Kalita, Mukul,Gogoi, Prasanta,Barman, Pranjit,Sarma, Bipul,Buragohain, Alok K.,Kalita, Ranjan D.
, p. 93 - 98 (2014/04/17)
A new series of bichelated complexes of the formula M(L)2 and M(L)Cl, where M = Ni(II), Cu(II), Co(II) and Pd(II) and L = a deprotonated Schiff base, were synthesized from the reaction of 5-bromo N-[(2-benzylthio)- phenyl] salicylaldimine (HL, 1), a new potential tridentate (O, N, S donor) Schiff base, with metal salts in methanol medium, and the complexes were characterized by a variety of physicochemical techniques, namely elemental analyses, FT-IR, 1H NMR and UV-Vis spectroscopies, thermogravimetric analysis and conductivity studies. The coordination mode of the palladium complex was determined by single crystal X-ray diffraction studies and was found to possess a distorted square planar structure with the ligand coordinated as a uninegatively charged tridentate chelating agent via the hydroxyl oxygen, azomethine nitrogen and thioether sulfur atoms, and the remaining fourth coordinating site was filled by a chloride ion. The copper complex shows very good catalytic activities towards the oxidation of organic thioethers to the corresponding sulfoxide and sulfones using H2O2 as the oxidant. The ligand and complexes exhibited considerable antibacterial and antifungal activities against Klebsiella pneumoniae (ATCC 10536), Staphylococcus aureus (ATCC 11632) and Candida albicans.
Conversion of o-Nitrothiophenols into o-Aminobenzenesulphonic Acids
Bamfield, Peter,Greenwood, David,Lotey, Harvinder,Stirling, Charles J. M.
, p. 691 - 696 (2007/10/02)
The mechanism of conversion of o-nitrothiophenols into o-aminobenzenesulphonic acids in aqueous dioxane has been investigated with particular reference to evidence for the rate-determining formation of a cyclic intermediate.This intermediate is susceptible to interception by both external and internal nucleophilic functions, and the sulphonic acid is shown by isotope labelling experiments to take two oxygen atoms from H2(18)O in the reaction mixture, under conditons in which neither starting materials nor products exchange with H2(18)O.A tentative pathway is advanced.
149. Notizen zur Synthese von 2-Aminophenylsulfonen
Courtin, Alfred,Tobel, Hans-Rudolf von,Auerbach, Guenther
, p. 1412 - 1419 (2007/10/02)
Syntheses of the alkyl, cycloalkyl and aryl 2-aminophenyl sulfones 10 were achieved by oxidation of the corresponding 2-nitrophenyl sulfides 7 to the 2-nitrophenyl sulfones 9 followed by ethanolic Bechamp-reduction.The sulfides 7 in turn were obtained by either reactions of 2-nitro-thiophenol (8) with the appropriate alkyl and cycloalkyl halides or of 2-chloro-nitrobenzene (5) with the relevant thiols.Condensation of 2-nitrobenzenesulfinic acid (3) with bromoacetic acid in aqueous alkaline solution led - presumably via 2-nitrophenylsulfonylacetic acid (4) - to methyl2-nitrophenyl sulfone (1), reduction of which gave 2-aminophenyl methyl sulfone (2).Treatment of 2-aminothiophenol (11) with t-butyl alcohol in aqueous sulfuric acid gave 2-aminophenyl t-butyl sulfide (12), which was acetylated to o-t-butylthio-acetanilide (13).Oxidation of the latter to o-t-butylsulfonyl-acetanilide (14) followed by hydrolysis led to 2-aminophenyl t-butyl sulfone (15).
