21281-74-3Relevant academic research and scientific papers
Immobilization of MoO2Cl2 on polystyrene via different linkers and oxidation of sulfides in the presence of hydrogen peroxide
Grivani,Gholampoor
, p. 349 - 355 (2012)
Chloromethylated polystyrene was oxidized to aldehydic polystyrene and by reaction of this aldehydic polystyrene resin with furfuryl amine and 2-(amino methyl) pyridine, imine-bounded polystyrene resins 1a and 1b were obtained. Amine-bounded polystyrene resins 1c-1f were also prepared by direct reaction of chloromethylated polystyrene and amines. These functionalized polystyrene resins were used to immobilize MoO2Cl2 on polystyrene. These functionalized polystyrene resins were characterized with elemental analysis (CHN) and FT-IR spectrum. Polymersupported catalysts were characterized with FT-IR and neutron activation analysis (NAA). These catalysts were used in oxidation of methyl phenyl sulfide in the presence of H2O2 as oxidant and the results showed that these catalysts were highly active and selective. The reusability of these heterogeneous catalysts was also investigated and the results showed that the supported MoO2Cl 2 catalyst on polystyrene via imidazole liker was highly reusable as it was used 15 times in oxidation of methyl phenyl sulfide in the presence of environmental benign oxidant (H2O2) and solvent (H 2O) without any decrease in its activity. Then the catalytic activity of these supported catalysts was investigated in oxidation of some aliphatic and aromatic sulfides. Almost all of these supported molybdenum-based catalysts were highly active and selective in the conversion of these sulfides to their corresponding sulfoxides.
Oxidation of 2-Chloroethyl Sulfides to Sulfoxides by Dimethyl Sulfoxide
Hsu, Fu-Lian,Szafraniec, Linda L.,Beaudry, William T.,Yang, Yu-Chu
, p. 4153 - 4155 (1990)
While most organic sulfides were not oxidized by dimethyl sulfoxide (DMSO), the alkyl 2-chloroethyl sulfides and bis(2-chloroethyl) sulfide slowly reacted with DMSO to produce the corresponding sulfoxides at 25-70 deg C under nitrogen.The mechanism of the oxidation is proposed to involve nucleophilic substitution by DMSO followed by neighboring sulfur participation to form a transient sulfonium ion with a four-membered ring structure.The sulfonium ion intermediate rapidly reacts with the chloride ion to produce 2-chloroethyl sulfoxides. 2-Hydroxyethyl sulfoxides were also produced, probably due to the presence of a trace amount of water in the DMSO.This reaction demonstrates, for the first time, the unique reactivity of 2-chloroethyl sulfides in DMSO.
Oxo-vanadium complex immobilized on chitosan coated-magnetic nanoparticles (Fe3O4): A heterogeneous and recyclable nanocatalyst for the chemoselective oxidation of sulfides to sulfoxides with H2O2
Veisi, Hojat,Sajjadifar, Sami,Biabri, Parisa Mohammadi,Hemmati, Saba
, p. 240 - 247 (2018)
This article presents the synthesis of Schiff base oxo-vanadium complex immobilized on chitosan coated-magnetic Fe3O4 nanoparticles [VO(CS)@Fe3O4] as a new magnetic interphase nanocatalyst. This type of functionalizing the surface of magnetic particles is a graceful method for bridging the gap between two types of heterogeneous and homogeneous catalysis. The characterization of as-synthesized nanocatalyst was performed through Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (EDS), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), and X-ray photoelectron spectroscopy (XPS). The chemoselective oxidation of sulfides to sulfoxides using green oxidant of hydrogen peroxide at ambient temperature in high-yield was catalyzed with VO(CS)@Fe3O4. The synthesized catalyst can be used up to 8 times with no considerable leaching and change in its activity. Both improvement of catalytic performance and easy separation for the reaction procedure were obtained because of the presence of oxo-vanadium and the magnetic core.
A new supramolecular zinc(II) complex containing 4-biphenylcarbaldehyde isonicotinoylhydrazone ligand: Nanostructure synthesis, catalytic activities and Hirshfeld surface analysis
Tyula, Yunes Abbasi,Zabardasti, Abedien,Goudarziafshar, Hamid,Kucerakova, Monika,Dusek, Michal
, (2018)
A new potentially tridentate hydrazone ligand, 4-biphenylcarbaldehyde isonicotinoylhydrazone (4-bpinh), was prepared by the condensation of biphenyl-4-carboxaldehyde with isonicotinic acid hydrazide. Then, its nano-sized and single crystal of zinc complex were synthesized using sonochemical and heat gradient methods, respectively. The structure of complex, [Zn(4-bpinh)2 Br2] (1), was determined by single-crystal X-ray diffraction, FT-IR, and elemental analysis, and the nano-structure of complex was characterized by FT-IR, XRD, and SEM. The single crystal X-ray structure of complex showed that the metal center has a distorted tetrahedral geometry and the hydrazone ligand acts as monodentate trough the pyridyl N atom. Moreover, the analysis of crystal structures indicates the existence of intermolecular interactions such as N/C–H?Br/O, N/C–H?π, and π?π stacking in the stabilization of complex structure which finally led to the formation of the three-dimensional supramolecular structure. Also, the impact of this interactions was more studied using Hirshfeld surface analysis and corresponding 2D fingerprint plots. Furthermore, the catalytic activity of 1 was studied in the selective oxidation of various sulfides to corresponding sulfoxides using hydrogen peroxide as the oxidative agent.
Chemo-selective oxidation of sulfide to sulfoxides with H2O2 catalyzed by oxo-vanadium/Schiff-base complex immobilized on modified magnetic Fe3O4 nanoparticles as a heterogeneous and recyclable nanocatalyst
Veisi, Hojat,Rashtiani, Asra,Rostami, Amin,Shirinbayan, Mohadeseh,Hemmati, Saba
, p. 358 - 366 (2019)
In this study, a schiff-base oxo-vanadium complex supported on magnetic Fe3O4 nanoparticles [VO(BINE)@Fe3O4] is prepared as a novel magnetically interphase nanocatalyst and its structural features are evaluated using different methods of TEM, SEM, EDX, ICP, VSM, TGA and FT-IR. Catalytic investigations demonstrate that this catalyst can catalyze chemoselective oxidation of sulfides to sulfoxides in high yields and short times at room temperature using hydrogen peroxide, as a green oxidant. The catalyst can be recovered up to 8 cycles without noticeable leaching and loss of catalytic activity.
l-Arginine complex of copper on modified core–shell magnetic nanoparticles as reusable and organic–inorganic hybrid nanocatalyst for the chemoselective oxidation of organosulfur compounds
Nikoorazm, Mohsen,Moradi, Parisa,Noori, Nourolah,Azadi, Gouhar
, p. 467 - 478 (2020/09/01)
In this paper, we report the fabrication and characterization of a stable heterogeneous nanostructure catalyst of copper immobilized on Fe3O4@SiO2@l-Arginine, for the oxidation of sulfides and oxidative coupling of thiols. The prepared nanocatalyst has been characterized by different techniques such as FTIR, XRD, SEM, TEM and TGA. These nanoparticles were the effective catalyst for selective oxidation of sulfides and oxidative coupling of thiols using 30% H2O2. The suggested method offers several prominent advantages such as mild condition, use of magnetically reusable catalyst, simple workup procedure, good to high yields of products and great selectivity.
Synthesis and Characterization of Magnetic Functionalized Ni and Cu Nano Catalysts and Their Application in Oxidation, Oxidative Coupling and Various Multi-Component Reactions
Hajjami, Maryam,Sheikhaei, Shiva,Gholamian, Fatemeh,Yousofvand, Zakieh
, p. 2420 - 2435 (2021/01/04)
Abstract: Two magnetic nano catalysts of nickel and copper, Fe3O4@SiO2@DOP-BenPyr-M(II), (M=Ni and Cu) have been synthesized. These catalysts were applied as recoverable, efficient and new heterogeneous catalysts for the high yielding and room temperature one-pot procedure of selective oxidation of sulfides to sulfoxides and oxidative coupling of thiols to disulfides. In addition, the catalytic activity of Fe3O4@SiO2@DOP-BenPyr-Ni(II) was investigated as heterogeneous nanocatalyst for synthesis of 2,3-dihydroquinazolin-4(1H)-ones, 5-substituted 1H-tetrazoles and polyhydroquinolines. The synthesized catalysts were characterized by FT-IR, TGA, XRD, VSM, EDX, ICP and SEM techniques. These catalysts were recovered by an external magnet and reused several times without significant loss of catalytic efficiency. Graphic Abstract: [Figure not available: see fulltext.]
Synthesis of 5-substituted 1H-tetrazoles and oxidation of sulfides by using boehmite nanoparticles/nickel-curcumin as a robust and extremely efficient green nanocatalyst
Jani, Muhammed Ali,Bahrami, Kiumars
, (2020/09/21)
Nickel-anchored curcumin-functionalized boehmite nanoparticles (BNPs@Cur-Ni) as a robust and versatile nanocatalyst was synthesized and well-characterized by using Fourier transform infrared (FT-IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), X-ray mapping, thermogravimetric analysis (TGA), differential thermal analysis (DTA), Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), and inductively coupled plasma optical emission spectroscopy (ICP-OES). The synthesis of 5-substituted 1H-tetrazoles and the oxidation of sulfides were conducted by BNPs@Cur-Ni with excellent turnover number (TON) and turnover frequency (TOF) outcomes. Also, the catalyst was reused for several sequential runs without Ni leaching or decreasing in reaction yield. Utilizing the curcumin and boehmite with a natural source as well as poly(ethylene glycol) (PEG) as a solvent in this simple protocol can be based on green chemistry rules.
Synthesis and characterization of VO–vanillin complex immobilized on MCM-41 and its facile catalytic application in the sulfoxidation reaction, and synthesis of 2,3-dihydroquinazolin-4(1H)-ones and disulfides in green media
Nikoorazm, Mohsen,Khanmoradi, Maryam
, p. 1477 - 1489 (2020/03/11)
In this work, a vanillin complex is immobilized onto MCM-41 and characterized by FT-IR, X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, thermogravimetric analysis, and BET techniques. This supported Schiff base complex was found to be an efficient and recoverable catalyst for the chemoselective oxidation of sulfides into sulfoxides and thiols into their corresponding disulfides (using hydrogen peroxide as a green oxidant) and also a suitable catalyst for the preparation of 2,3-dihydroquinazolin-4(1H)-one derivatives in water at 90°C. Using this protocol, we show that a variety of disulfides, sulfoxides, and 2,3-dihydroquinazolin-4(1H)-one derivatives can be synthesized in green conditions. The catalyst can be recovered and recycled for further reactions without appreciable loss of catalytic performance.
Pyridiniumporphyrazinato oxo-vanadium tribromomethanide as a new source of Br+ catalyst for the chemo and homoselective oxidation of sulfides and benzylic alcohols
Safaiee, Maliheh,Moeinimehr, Mahtab,Zolfigol, Mohammad Ali
, p. 138 - 150 (2019/06/17)
The present study describes the design and synthesis of novel nano N-bromo porphyrazin (N-bromo tetra-2,3-pyridiniumporphyrazinato oxo-vanadium tribromomethanide [VO(TPPABr)] CBr3) as an efficient, recyclable and thermal stable heterogeneous catalyst for chemo and homoselective oxidation of sulfides to sulfoxides and benzyl alcohols to benzaldehydes. This ecofriendly heterogeneous catalyst was fully characterized by FT-IR spectra, UV–Vis spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermal gravimetric analysis (TGA), energy-dispersive X-ray spectroscopy (EDX) and elemental analysis (CHN). The synthesized catalyst exhibited a high-performance and considerable reusability.
