Xi:Irritant;
67-68-5Relevant articles and documents
Synthesis and reactivity of two new trichloromethyl substituted dihydroisoquinoline-derived oxaziridines
Aydi, Rihab,Kammoun, Majed
, p. 134 - 144 (2016)
N-Alkyl oxaziridines may be used as reagents for the oxidation of sulfides in acid-promoted reactions. This article reports on a simple and efficient synthesis of two new trichloromethyl substituted dihydroisoquinoline oxaziridines, a new family of organi
Magnetic nanoparticles supported Cu2+ and Ce3+ complexes: toward the chemical and electrochemical oxidation of alcohol and sulfide derivatives
Tamoradi, Taiebeh,Navaee, Aso,Salimi, Abdollah,Mousavi, Seyedeh Masoumeh,Ghadermazi, Mohammad,Veisi, Hojat
, p. 4517 - 4530 (2019)
Abstract: Heterogeneous catalysts are more prominent rather than homogenous catalysts since they are simply separated from products. To improve and develop heterogeneous catalysts, two core–shell magnetic nanocatalysts are prepared by anchoring of Cu and Ce complexes on the surface of Fe3O4, then the efficiency of the obtained catalysts are tested toward both chemical and electrochemical oxidation of sulfide and alcohol derivatives. Characterization of mentioned catalysts was performed by using FT-IR, XRD, EDX and SEM. The obtained results confirm that the reported method has outstanding advantages such as short reaction time, high yield, easy operation, easy separation, inexpensive and non-toxic material and chemical and thermal stability. Graphical abstract: [Figure not available: see fulltext.].
Ozone and oxygen atom reactions with dimethylsulfide and methanethiol in argon matrices
Tevault, D. E.,Mowery, R. L.,Smardzewski, R. R.
, p. 4480 - 4487 (1981)
Ground state oxygen atoms, generated by visible photolysis of ozone, have ben reacted with CH3SCH3 and CH3SH in argon matrices.For CH3SCH3, a stepwise addition to form DMSO and dimethylsulfone was observed.Methanethiol reactions with O atoms were more complex, leading to production of CH3SOH, CH3OSH, CH3S(O)H, and possibly CH3-SO2-H.These results are compared to the O + H2S reaction.The matrix results are also compared to gas phase studies where more extensive fragmentation has been observed, and inferences are drawn concerning the relative matrix deactivation ratesof the highly energetic sulfide-oxygen-atom precursor complex.
Kinetics and mechanism of the oxidation of dimethyl sulfide by hydroperoxides in aqueous medium: Study on the potential contribution of liquid-phase oxidation of dimethyl sulfide in the atmosphere
Amels, Peter,Elias, Horst,Wannowius, Klaus-Juergen
, p. 2537 - 2544 (1997)
Conventional and multi-wavelength stopped-flow spectrophotometry has been used to study the kinetics of the oxidation of dimethyl sulfide (DMS) by hydroperoxides, ROOH = hydrogen peroxide (H2O2), peroxo formic acid (HCO3H), peroxo acetic acid (CH3CO3H), peroxo nitrous acid (ONOOH), peroxo monosulfuric acid anion (PMS = HSO5-), and the H2O2 analogue hypochlorous acid (HOCl), in aqueous solution in the pH range 0-14 at 293 K and I = 1.0 M. The reaction between DMS and ROOH and between dimethyl sulfoxide (DMSO) and ROOH is a second-order process, leading to DMSO and dimethyl sulfone (DMSO2), respectively. It was shown by gas chromatography that, except for the oxidant ONOOH, DMSO and DMSO2 are the only oxidation products. It follows from the pH dependence of the second-order rate constant k2 that both the hydroperoxide ROOH, rate constant kROOH, and its anion ROO-, rate constant kROO, oxidize DMS and DMSO, respectively. The data for kROOH (dm3 mol-1 s-1) and for kROO (dm3 mol-1 s-1) at 293 K for the formation of DMSO and DMSO2 are presented. For the oxidation of DMS kROOH > kROO; for the step DMS → DMSO, kROOH ranges from 4780 (PMS) to 0.018 (H2O2), whereas kROO lies in the range 88 (PMS) to 0.0018 (H2O2); for the step DMSO → DMSO2, kROOH ranges from 349 (HOCl) to 2.7 × 10-6 (H2O2), whereas kROO lies in the range 18 (PMS) to 8.4 × 10-5 (H2O2). A mechanistic interpretation of the oxidation reactions, based on the ambifunctional character of both ROOH and DMSO, is presented. The relevance of in-cloud oxidation of DMS by atmospheric hydroperoxides such as CH3CO3H and HCO3H is discussed and substantiated.
THE CHEMISTRY OF 3-TRIFLUOROMETHYL-PERFLUORO-AZA-2-BUTENE AND THE SYNTHESIS OF A NEW OXAZIRIDINE: 3,3-BISTRIFLUOROMETHYL-2-TRIFLUOROMETHYLOXAZIRIDINE
Bragante, Letanzio,Desmarteau, Darryl D.
, p. 181 - 197 (1991)
Some reactions of (CF3)2C=NCF3 1 (3-trifluoromethyl-perfluoro-aza-2-butene) are reported including the isomerisation to (CF3)2CFN=CF2 3 (3-trifluoromethyl-perfluoro-2-aza-1-butene) and the formation of (CF3)2CFN(Br)CF3 5 (N-perfluoroisopropyl-N-trifluoromethyl-N-bromoamine).The synthesis and characterization of 2 (3,3-bistrifluoromethyl-2-trifluoromethyl-oxaziridine) from 1 is also reported along with its thermal rearrangement to CF3C(O)N(CF3)2 6 (bis trifluoromethyl-trifluoroacetamide) and some selective organic oxidations with 2.
Thermal analysis, phase transitions and molecular reorientations in [Fe(OS(CH3)2)6](ClO4)2
Szostak, El?bieta,Migda?-Mikuli, Anna
, p. 1151 - 1158 (2017)
Thermogravimetric analysis connected with quadruple mass spectroscopy (TG/MS) for an identification of [Fe(OS(CH3)2)6](ClO4)2 decomposition products, carried out to determine its thermal stability, has indicated that the title compound does not change its mass till ca. 385?K. Above this temperature, it starts slowly to lose a part of (CH3)2SO ligands, which begins to form a liquid phase, in which the title compound partially dissolves. Finally, at ca. 476?K, when two from six coordinated (CH3)2SO were detached from central atom, the [Fe(OS(CH3)2)4](ClO4)2 is formed. At ca. 514?K this sample explodes. Differential scanning calorimetry (DSC) measurements performed in the temperature range of 100–443?K revealed existence of two anomalies on DSC curves. The first, a big one, at Tc?≈?338?K is associated with the phase transition: crystal phase Cr. 1???rotational phase Rot. 1, and the second, a small one, at Tm1?≈?414?K is associated with two parallel processes, which are: decomposition of [Fe(OS(CH3)2)6](ClO4)2 with the DMSO release and dissolution of [Fe(OS(CH3)2)6?x](ClO4)2 in DMSO. The large value of solid–solid phase transition entropy change (?Sc?≈?79.3?J?mol?1?K?1) and small value of the melting process (?Sm?≈?5.8?J?mol?1?K?1) indicate on such large configurational disorder in the high-temperature phase that this phase can be considered as a rotational phase (so called also as “plastic crystals”). The results of the vibrational and reorientational dynamics of (CH3)2SO ligands and ClO4 ? anions in the high- and low-temperature phases of [Fe(OS(CH3)2)6](ClO4)2, investigated by Fourier transform infrared absorption spectroscopy, show that even in the low-temperature phase the CH3 groups in (CH3)2SO ligands and also the ClO4 ? anions perform fast (correlation time τR?≈?10?12?s) reorientational motions. These reorientational motions above Tc temperature became so fast that in the rotational phase they turn into nearly free rotational motions.
Selective oxidation of alcohols and sulfides: Via O2using a Co(ii) salen complex catalyst immobilized on KCC-1: Synthesis and kinetic study
Allahresani, Ali,Hemmat, Kaveh,Naghdi, Elaheh,Nasseri, Mohammad Ali
, p. 37974 - 37981 (2020)
The aim of this study was to immobilize a Co(ii) salen complex on KCC-1 as a catalyst that can be recovered (Co(ii) salen complex?KCC-1). Field-emission transmission electron microscopy, FT-IR spectroscopy, thermogravimetric analysis, elemental analysis,
Chemoselective methyltrioxorhenium(VII)-catalyzed sulfoxidations with hydrogen peroxide
Adam, Waldemar,Mitchell, Catherine M.,Saha-Moeller, Chantu R.
, p. 13121 - 13124 (1994)
The selective oxidation of sulfides to sulfoxides by hydrogen peroxide under methyltrioxorhenium(VII) catalysis was examined; a high selectivity of sulfoxide over sulfone was achieved, except in the presence of water, which enhanced sulfone formation.
Synthesis of a Novel μ-Oxo Binuclear Copper(II) Complex Ligated by Hydrotris(3,5-dimethyl-1-pyrazolyl)borate
Kitajima, Nobumasa,Koda, Takayuki,Moro-Oka, Yoshihiko
, p. 347 - 350 (1988)
A novel μ-oxo binuclear copper(II) complex, 2O in which the each of coppers coordinates to three nitrogens, was prepared by the reaction of a copper(I) triphenylphosphine complex with iodosylbenzene.
Copper based on diaminonaphthalene-coated magnetic nanoparticles as robust catalysts for catalytic oxidation reactions and C-S cross-coupling reactions
Yarmohammadi, Nasrin,Ghadermazi, Mohammad,Mozafari, Roya
, p. 9366 - 9380 (2021/03/16)
In this work, the immobilization of copper(ii) on the surface of 1,8-diaminonaphthalene (DAN)-coated magnetic nanoparticles provides a highly active catalyst for the oxidation reaction of sulfides to sulfoxides and the oxidative coupling of thiols to disulfides using hydrogen peroxide (H2O2). This catalyst was also applied for the one-pot synthesis of symmetrical sulfidesviathe reaction of aryl halides with thiourea as the sulfur source in the presence of NaOH instead of former strongly basic and harsh reaction conditions. Under optimum conditions, the synthesis yields of sulfoxides, symmetrical sulfides, and disulfides were about 99%, 95%, and 96% respectively with highest selectivity. The heterogeneous copper-based catalyst has advantages such as the easy recyclability of the catalyst, the easy separation of the product and the less wastage of products during the separation of the catalyst. This heterogeneous nanocatalyst was characterized by FESEM, FT-IR, VSM, XRD, EDX, ICP and TGA. Furthermore, the recycled catalyst can be reused for several runs and is economically effective.
