694-59-7Relevant articles and documents
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.
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.
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.
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.
The M?CPbA?NH3(G) system: A safe and scalable alternative for the manufacture of (substituted) pyridine and quinoline N?oxides?
Palav, Amey,Misal, Balu,Ernolla, Anilkumar,Parab, Vinod,Waske, Prashant,Khandekar, Dileep,Chaudhary, Vinay,Chaturbhuj, Ganesh
supporting information, p. 244 - 251 (2019/03/17)
An improved, safe, and scalable isolation process for (substituted) pyridine and quinoline N-oxides in quantitative yields along with high purities using the m-CPBA?NH3(g) system is described. The safety was assessed by reaction calorimetry and differential scanning calorimetry studies for possible hazards during the conversion and isolation steps. Careful interpretation of the data substantiated the safety and scalability. The process flow is simplified to meet the industrial requirements of safety, cost-effectiveness, and utility minimization. The reaction was safely demonstrated at a 2.5 kg scale.
