694-59-7Relevant academic research and scientific papers
Highly dispersed Mo-doped graphite carbon nitride: Potential application as oxidation catalyst with hydrogen peroxide
Gon?alves, Diogo A. F.,Alvim, Raquel P. R.,Bicalho, Hudson A.,Peres, Anderson M.,Binatti, Ildefonso,Batista, Pablo F. R.,Teixeira, Leonel S.,Resende, Rodrigo R.,Loren?on, Eudes
, p. 5720 - 5727 (2018)
A novel molybdenum-doped graphite carbon nitride (g-C3N4) catalyst was successfully prepared by simple calcination and applied to the oxidation of various substrates with hydrogen peroxide or tert-butylhydroperoxide (TBHP) as the oxidant. The morphology, structure, and chemical composition of the catalyst were characterized fully, demonstrating the presence of highly dispersed molybdenum species stabilized by the nitrogen atoms of g-C3N4. The Mo(vi) sites stabilized on the triazine ring of g-C3N4 interacted with H2O2 or TBPH, forming peroxo-Mo(vi) groups, which were active for oxidation. Mo-doped g-C3N4 exhibited significantly enhanced activity for the non-selective oxidation of methylene blue (MB) when compared with MoO3 or pure g-C3N4. Furthermore, the catalyst exhibited high efficiency for the selective oxidation of sulfides to sulfoxides, and N-compounds to the corresponding N-oxides, under mild conditions. The catalyst also showed potential application in the epoxidation of olefins. The effects of the homogeneous reaction of leached Mo and the recyclability of the catalyst were also evaluated. The data show that the catalyst exhibits great potential for various industrial applications.
Fe-complex of a tetraamido macrocyclic ligand: Spectroscopic characterization and catalytic oxidation studies
Sullivan, Shane Z.,Ghosh, Anindya,Biris, Alexandru S.,Pulla, Sharon,Brezden, Anna M.,Collom, Samulel L.,Woods, Ross M.,Munshi, Pradip,Schnackenberg, Laura,Pierce, Brad S.,Kannarpady, Ganesh K.
, p. 359 - 365 (2010)
This work presents the spectroscopic characterization and reaction studies of a FeIII-complex (2) of a tetraamido macrocyclic ligand (1, 15,15-dimethyl-5,8,13,17-tetrahydro-5,8,13,17-tetraaza-dibenzo[a,g] cyclotridecene-6,7,14,16-tetraone). 2 was characterized primarily by means of EPR. In agreement with the magnetic moment (μeff = 3.87 BM), EPR spectroscopy of 2 shows signals consistent with S = 3/2 intermediate-spin ferric-iron. Besides EPR, mass spectrometry, UV/vis spectroscopy and cyclic voltammetry were used to further characterize 2. 2 is soluble in water and activates hydrogen peroxide under ambient conditions. 2 catalytically bleaches dyes, pulp and paper effluents and oxidizes several amines to their corresponding N-oxides with high turnover number and good yields.
Perfluoropropylation of Furans, Thiophenes, and Pyridines with Bis(heptafluorobutyryl) Peroxide
Sawada, Hideo,Yoshida, Masato,Hagh, Hidehiko,Aoshima, Kazuyoshi,Kobayashi, Michio
, p. 215 - 220 (1986)
Bis(heptafluorobutyryl) peroxide (1) smoothly reacted with furans and thiophenes under mild conditions to regioselectively give 2-perfluoropropylfurans and thiophenes in high yields.Mechanistically, reactions with furans or thiophenes are considered to be initiated by one-electron transfers from substrates to 1.On the other hand, the perfluoropropylation of pyridine was proceeded by the usual free-radical substitution to a pyridinium salt by a heptafluoropropyl radical produced by the homolytic decomposition of 1.
Effects of pyridine and its derivatives on the equilibria and kinetics pertaining to epoxidation reactions catalyzed by methyltrioxorhenium
Wang, Wei-Dong,Espenson, James H.
, p. 11335 - 11341 (1998)
The coordination of substituted pyridines to MTO (methyltrioxorhenium) is governed by both electronic and steric effects. For example, the binding constant of pyridine to MTO is 200 L mol-1, whereas that of the better donor 4-picoline is 730 L mol-1 and that of the sterically encumbered 2,6- di-tert-butyl-4-methylpyridine is -1. A Hammett reaction constant ρ = -2.6, derived from meta- and para-substituted pyridine, applies to this equilibrium. Pyridine stabilizes the MTO/H2O2 system and accelerates the epoxidation of α-methylstyrene. The steady-state concentration of MTO is decreased during the catalytic epoxidation reaction by coordinating a pyridine derivative, thus stabilizing the MTO/H2O2 system against irreversible decomposition. Pyridine as a Lewis base accelerates the generation of the peroxorhehium catalysts, whereas coordination of pyridine to the diperoxorhenium complex appears responsible for the acceleration of epoxidation. Ultimately, however, it is the Bronsted basicity of pyridine that lowers the activity of hydronium ion, reducing the rate of epoxide ring opening.
Kinetics and Mechanism of the Oxidation of Pyridine by Caro's Acid Catalyzed by Ketones
Gallopo, Andrew R.,Edwards, John O.
, p. 1684 - 1688 (1981)
The kinetics of the oxidation of pyridine by peroxomonosulfate ion catalyzed by acetone and cyclohexanone has been investigated.The oxidation product was identified as pyridine 1-oxide, and the yield was found to be pH dependent.The rate law for the pyridine oxidation was shown to be .A mechanism involving a dioxirane intermediate which is consistent with the rate law has been postulated.Experiments leading to simplified forms of the rate law have been carried out.The ratios of rate constants kb/ka and ka'/ka were determined for both acetone and cyclohexanone.A side reaction, the Baeyer-Villiger process, is significant with cyclohexanone near pH 7.
Formation and catalytic activity of novel water soluble di[ethylenediaminetetraacetato bis(N-oxido)] lanthanides
Jiang, Xue,Chen, Mao-Long,Yang, Yu-Chen,Zhou, Zhao-Hui
, p. 9 - 12 (2013)
Reaction of hydrogen peroxide with ethylenediaminetetraacetato lanthanides results in the formation of water-soluble isomorphous N-oxido ethylenediaminetetraacetato lanthanides K5[Ln(edtaO2) 2] · 12H2O [Ln = La (1), Ce (2), Nd (3), H 4edta = ethylenediaminetetraacetic acid C10H 16O8N2] in weak basic solution, where lanthanide ions are octa-coordinated by two quardentate N-oxido edta ligands, resulting in a distorted anti-tetragonal prism. Based on the comparisons of solid and solution 13C NMR spectra, these compounds are fully dissociated in solution. Catalytic reaction of K5[La(edtaO 2)2]·12H2O shows 96% conversion for the reaction of pyridine to pyridine N-oxide at 70 C.
Immobilization of polyoxometalates on protonated graphitic carbon nitride: A highly efficient and reusable catalyst for the synthesis of pyridine-N-oxides
Cai, Menglu,Cao, Wenhui,Chen, Yingqi,Dai, Liyan,Fang, Yangyang,Jia, Mingji,Song, Yujun,Wang, Xiaozhong,Yuan, Lei
, (2022/01/13)
N-oxides represent a significant class of compounds with increasing value due to their extensive applications in chemistry and biology. Herein, a series of heterogeneous catalysts were prepared based on the impregnation-precipitation method. In this strategy, protonated graphitic carbon nitride (pg-C3N4) was prepared first, and Cs3PW12O40 was immobilized over the surface of pg-C3N4 to obtain CsPW-CN composites. The prepared CsPW-CN composites achieved better catalytic activities than the pure Cs3PW12O40 in the N-oxidation of pyridine, and obtained 99% yield of pyridine-N-oxide in aqueous medium with H2O2 as a mild oxidant. Based on the characterizations of the catalyst morphology, structure, and chemical composition, the intimate interaction between Cs3PW12O40 and pg-C3N4 was verified. Meanwhile, the occurrence of the unique semi-embedded structure was an expected derivation of the pg-C3N4. Furthermore, the prepared CsPW-CN-1 composite was readily recovered and yielded 88.3% of the pyridine-N-oxide after 4 runs. This work could potentially provide a well-defined CsPW-CN composite for the N-oxidation of pyridine with a sustainable approach.
Method for preparing sulfone and N-oxygen compound by using green and efficient oxidation system
-
Paragraph 0039-0041, (2021/01/29)
The invention discloses a method for preparing sulfone and N-oxygen compound by using a green and efficient oxidation system. The method comprises the following steps of: by using a tertiary amine compound or aromatic thioether or fatty thioether compound as a raw material, H2O2 as an oxidant, methanol as a reaction solvent and potassium carbonate as an alkali, introducing sulfuryl fluoride 5O2F2gas as an accelerator; performing stirring at room temperature under a sealed condition for oxidation reaction; and after finishing the reaction, filtering to remove solid potassium carbonate, dryingto remove water, filtering to obtain a crude product, and finally carrying out column chromatography separation to obtain a pure product. Tertiary amine is oxidized into an N-oxygen compound, and thethioether is oxidized into sulfone. According to the method, the sulfuryl fluoride (SO2F2) which is very cheap and easy to obtain is used as the reaction promoter, green and environment-friendly hydrogen peroxide (H2O2) is used as an oxidizing agent, and so that the yield of the reaction is generally high; after the reaction, byproducts are only water and inorganic salts (SO4 and F) whichare easy to remove and free of pollution, and the green and efficient oxidation system can be realized, and therefore, the method is suitable for large-scale industrial production.
SO2F2-mediated oxidation of primary and tertiary amines with 30% aqueous H2O2 solution
Liao, Xudong,Zhou, Yi,Ai, Chengmei,Ye, Cuijiao,Chen, Guanghui,Yan, Zhaohua,Lin, Sen
supporting information, (2021/11/01)
A highly efficient and selective oxidation of primary and tertiary amines employing SO2F2/H2O2/base system was described. Anilines were converted to the corresponding azoxybenzenes, while primary benzylamines were transformed into nitriles and secondary benzylamines were rearranged to amides. For tertiary amine substrates quinolines, isoquinolines and pyridines, their oxidation products were the corresponding N-oxides. The reaction conditions are very mild and just involve SO2F2, amines, 30% aqueous H2O2 solution, and inorganic base at room temperature. One unique advantage is that this oxidation system is just composed of inexpensive inorganic compounds without the use of any metal and organic compounds.
Method for synthesizing pyridine-N-oxide through catalytic oxidation by continuous non-solvent method
-
Paragraph 0037-0043, (2020/08/06)
The invention discloses a method for synthesizing pyridine-N-oxide through catalytic oxidation by a continuous non-solvent method, and belongs to the field of chemical synthesis. The method is characterized by comprising the following steps: mixing metered pyridine or alkyl pyridine with an oxidizing agent in proportion, carrying out a reaction in a continuous tubular reactor filled with an immobilized catalyst, and distilling off excess water after the reaction is finished to obtain a pyridine-N-oxide or alkyl pyridine-N-oxide product, wherein the catalyst is cross-linked polystyrene resin immobilized with active substance anions and has a quaternary ammonium salt group. Compared with the prior art, the method for synthesizing the pyridine-N-oxide through catalytic oxidation by the continuous non-solvent method can realize continuous production of the pyridine-N-oxide, is environment-friendly, energy-saving and high in conversion rate, and has very good promotion and application values.
