- Silica-supported molybdenum complex: A novel, selective and reusable organic-inorganic hybrid catalyst for eco-friendly oxidation of sulfides and olefins
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A novel, highly efficient and reusable molybdenum based catalyst has been synthesized by covalent grafting of 2,6-diacetylpyridine-monosalicyloylhydrazone onto functionalized silica followed by complexation with MoO 2(acac)2, and the resulting organic-inorganic hybrid material was found to be highly effective catalyst for oxidation of various sulfides and olefins to their corresponding sulfoxides/sulfones and epoxides, respectively. The catalyst was characterized by elemental analysis (CHN), diffuse reflectance UV-Vis, 13C CPMAS NMR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and BET surface area analysis, energy dispersive X-ray fluorescence (ED-XRF), Fourier-transform infrared (FT-IR) and atomic absorption spectroscopy (AAS). Mild reaction conditions, high turnover frequency, high selectivity, easy recovery and reusability of the catalyst render the present protocol very useful to address the industrial needs and environmental concerns.
- Sharma,Pandey, Amit,Gulati, Shikha
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- Aqueous sodium hypochlorite mediated chemoselective oxidation of chalcogenides to monoxides and dioxides by microwave exposure
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A solvent-free, rapid, and highly selective oxidation of sulfides, selenides, and tellurides (chalcogenides) to the corresponding monoxides (sulfoxides, selenoxides, and telluroxides) or the corresponding dioxides (sulfones, selenones, and tellurones) has been developed using aqueous sodium hypochlorite on solid supports by exposure to microwave. Chemoselectivity and quantitative yields have been attained in most cases.
- Khurana, Jitender,Nand, Bhaskara
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experimental part
p. 906 - 909
(2011/01/08)
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- Determination of Organosulfur Compounds in Hydrocarbon Matrices by Collision Activated Dissociation Mass Spectrometry
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Collision activated dissociation mass spectrometry of (M+1)(1+) ions from 33 organosulfur compounds are presented.Ions resulting from loss of the radical HS. are prominent in the spectra of thiophenols, dithienyls, trithienyls, and dibenzothiophene derivatives but not in the spectra of aliphatic sulfides or highly alkylated thiophenes.Use of 33 amu neutral loss scans on a triple quadrupole mass spectrometer for the analysis of organosulfur compounds in crude petroleum distillates is described.Total time per sample for this analysis is under 20 min.Qualitative differences in the spectra of several crude oil samples are readily apparent.Preliminary results from collision activated dissociation of (M+NO)(1+) ions in the nitric oxide chemical ionization mass spectra of aliphatic sulfones are described.
- Hunt, Donald F.,Shabanowitz, Jeffrey
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p. 574 - 578
(2007/10/02)
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