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Tuesday, November 17, 2020 | History

2 edition of discharge flow study of the kinetics of trifluoromethyl radicals with molecular oxygen found in the catalog.

discharge flow study of the kinetics of trifluoromethyl radicals with molecular oxygen

Susan M. Belanger

discharge flow study of the kinetics of trifluoromethyl radicals with molecular oxygen

  • 119 Want to read
  • 33 Currently reading

Published .
Written in English

    Subjects:
  • Fluoroform.,
  • Chemical ionization mass spectrometry.,
  • Chemical kinetics.

  • Edition Notes

    Statementby Susan M. Belanger.
    ContributionsBoston College. Dept. of Chemistry.
    The Physical Object
    Pagination87 leaves :
    Number of Pages87
    ID Numbers
    Open LibraryOL16581225M

    Trifluoroiodomethane, also referred to as trifluoromethyl iodide is a halomethane with the formula CF 3 I. It is an experimental alternative to Halon (CBrF 3) in unoccupied areas. It would be used as a gaseous fire suppression flooding agent for in-flight aircraft and electronic equipment al formula: CF₃I. The Unusual Reaction of Semiquinone Radicals with Molecular Oxygen; Molecular structure of ion pairs from electric dipole moments. II. Complexing of potassium p-toluenesulfonate and lithium chloride with macrocyclic polyethers in octanoic acid. A study of oxidation kinetics of nickel metal in flowing air and oxygen-nitrogen mixtures / (Washington, D.C.: National Aeronautics and Space Administration: For sale by the Office of Technical Services, Dept. of Commerce, []), by Donald J. Progar, Beverley W. Lewis, and Langley Research Center (page images at HathiTrust). Trifluoromethyl hypofluorite is an organofluorine compound with the formula CF 3 exists as a colorless gas at room temperature and is highly toxic. It is a rare example of a hypofluorite (compound with an O−F bond). It is prepared by the reaction of F₂ gas with carbon monoxide. 2 F 2 + CO → CF 3 OF. The gas hydrolyzes only slowly at neutral pH. Boiling point: −95 °C (− °F; K).


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discharge flow study of the kinetics of trifluoromethyl radicals with molecular oxygen by Susan M. Belanger Download PDF EPUB FB2

We have determined the rate constants for the reactions IO + CHO → Products and IO + CFO → Products using a discharge–flow tube equipped with off-axis cavity-enhanced absorption spectroscopy (CEAS) for the detection of IO.

NO, produced from the titration of. A low-pressure discharge-flow system employing LIF detection for CH3O, and resonance-fluorescence detection for Cl, Br and I atoms, was used to investigate the kinetics of the reactions of CH3O with X and XO (where X = Cl, Br and I) at T = K.

The rate constants obtained are kCl = ( ± ) × 10−11 cm3. The resonance position of the fluorine nuclei of the inhibitor is shifted downfield ∼1 ppm upon complexation to the enzyme, and the trifluoromethyl group suffers some restriction of molecular motion in the bound state as indicated by T 1 and T 2 by: The reaction of the oxygen atom [O(3 P)] with chloroethylenes (RCl) viz.

CH 2 CCl 2, CHClCCl 2, CCl 2 CCl 2 was studied in a discharge flow set up in the pressure range of – Torr, the employing O(3 P) chemiluminescence titration method for detection of residual oxygen. The transition state geometry for ethene, 1,1 di-chloroethylene and tri-chloroethylene show a asymmetric approach for Cited by: Kinetic and product branching data have been measured for the reaction of CH3O2 radicals with ClO in the temperature range K using the discharge-flow/mass spectrometry technique.

The book continues with the discussion of discharge physics in pure nitrogen and oxygen, and in mixtures. Some examples are given of applications, of which cleaning of atmospheric gases is, in my. Cavity ring-down spectroscopy was used to study the kinetics of formation of IO radicals in the reaction of CH2I + O2 in a flow cell at 52 ± 3 Torr total pressure of N2 diluent and a temperature.

Rate constants for the reaction of OH radicals with trans-1,2-dichloroethene and 1,1-dichloroethene have been determined at a pressure of Torr and at T = ± 2 K using the discharge-flow by: 7. The kinetics of the self-reaction and the reaction with OH of the amidogen radical were studied at K by pulse radiolysis combined with UV detection of NH2 and OH radicals at and nm.

The kinetic processes occurring in an electric-discharge oxygen-iodine laser are analyzed with the help of a 2D (r, z) gasdynamic model taking into account transport of excited oxygen, singlet.

Thermochemical properties for important discharge flow study of the kinetics of trifluoromethyl radicals with molecular oxygen book in the formyl methyl radical (C•H2CHO) + O2 reaction system are analyzed to evaluate reaction paths and kinetics in both oxidation and pyrolysis.

Enthalpies of formation (ΔHf°) are determined using isodesmic reaction analysis at the CBSQ composite and density functional levels. Entropies (S°) and heat capacities [Cp°(T)] are Cited by: The direct kinetics techniques of flash photolysis, molecular modulation, pulse radiolysis and discharge flow have all been applied to the study of RO2 radical reactions.

With all these techniques, a dissociative event, whether caused by photolysis, radiolysis or discharge, initiates the production of the radical, and there are often similarities in the chemical schemes which can be employed as Cited by: Trifluoromethylation reactions have attracted a great deal of attention in recent years, as this methodology provides access to several fluorinated compounds which have great importance in medicinal chemistry.

75 5-(Trifluoromethyl)uracil and -uridine derivatives also have shown strong antitumor and antiviral activities. 76 Therefore, several researchers have made an attempt to. This is because the transition between the 3state and the ground state is triply forbidden.

The SO radical, g Microwave spectroscopy of short-lived molecules analogous to the molecular oxygen, has a low-lying metastable excited state, 1located at about cm above the ground state (Ref. 1).Cited by: Search results for trifluoromethyl at Sigma-Aldrich. Compare Products: Select up to 4 products.

*Please select more than one item to compare. Trifluoromethylation in organic chemistry describes any organic reaction that introduces a trifluoromethyl group in an organic compound. Trifluoromethylated compounds are of some importance in pharmaceutical industry and l notable pharmaceutical compounds have a trifluoromethyl group incorporated: fluoxetine, mefloquine, Leflunomide, nulitamide, dutasteride.

Kinetics and Environmental Implications Yusuf G. Adewuyi Chap DOI: /bkch Publication Date (Print): Ap   The rate constants for the reactions of OH radicals with benzene and toluene have been measured directly by a shock tube/pulsed laser-induced fluorescence imaging method at high temperatures.

The OH radicals were generated by the thermal decomposition of nitric acid or tert-butyl hydroperoxide. The derived Arrhenius expressions for the rate constants were k(OH + benzene) = Cited by: Trifluoromethyl is a functional group that has the formula-CF naming of is group is derived from the methyl group (which has the formula -CH 3), by replacing each hydrogen atom by a fluorine atom.

Some common examples are trifluoromethane H– CF 3, 1,1,1-trifluoroethane H 3 C – CF 3, and hexafluoroacetone F 3 C –CO– CF nds with this group are a subclass of the organofluorines. discharge.2fi He deduced that the glow was due to energy released by the surface-catalyzed recombination of radicals produced in the discharge.

This discovery was a primitive ancestor of catalytic probes used to measure atom con- centrations in numerous flow tube kinetic st~dies.~~~~-~~ The first flow tube kinetic measurements were made in. The reaction of hydrogen atoms and chlorine trifluoride is studied directly by the discharge‐flow EPR technique over the temperature range of – K and total pressure range of 4–8 torr.

Hydrogen atoms are produced by dissociation of molecular hydrogen in a microwave : S. Pak, R. Krech, D. McFadden, D.

MacLean. Search results for trifluoromethyl at Sigma-Aldrich. Attention: Certain features of will be unavailable due to maintenance from Saturday evening, March 21st at pm CDT until Sunday morning, March 22nd at am CDT Please note that you still.

Fig. 4 shows the time evolution of some oxides of nitrogen formed by a microwave plasma in an air mixture obtained using kinetic modeling of the discharge involving a mechanism of ~ reactions to describe the relevant intermediate species (ions, atoms, radicals, and molecules), including excited states and the reaction products (Kossyi et al., ).Cited by: 7.

Temps, H. Wagner, "Kinetics of Reactions of Prototypical Aromatic Hydrocarbons with O (3 P) Atoms and CH 2 (X 3 B 1) Radicals: A Comparative Study", ACS Symposium on Combustion Chemistry, National Meeting of the American Chemical Society, New York, ; Fuel Chemis. Synonym: S-(Trifluoromethyl)dibenzothiophenium triflate, S-(Trifluoromethyl)dibenzothiophenium trifluoromethanesulfonate Empirical Formula (Hill Notation): C 14 H 8 F 6 O 3 S 2 Molecular.

Reaction Mechanism. The detailed electrochemical mineralization mechanism of PFOA has been analyzed in previous study [].The first step of electrochemical degradation is the electron transfer process from carboxylic acid to anode in which the intermediate IM1 is generated [].Then, perfluoroheptyl radical IM2 and CO 2 are produced from IM1 via the transition state TS1, which is a Cited by: 4.

Search results for trifluoromethyl at Sigma-Aldrich. ADVANCED SEARCH; STRUCTURE SEARCH; CERT OF ANALYSIS; SDS SEARCH. The main topic of the th General Assembly of the German Bunsen Society for Physical Chemistry is "Kinetics in the Real World".

We feature here a selection of recent articles on topics ranging from atmospheric, environmental, photo‐ and astrochemistry to catalytic processes and kinetics. Liquid-liquid reaction of hydrogen peroxide and sodium hypochlorite for the production of singlet oxygen in a centrifugal flow singlet oxygen generator.

United States: N. p., Book Thayer, III, W J is a low-pressure, multiphase flow chemical reactor that is used to produce molecular oxygen in an electronically excited state, i.e.

Flow techniques Flow techniques are typically used to study reactions occurring on timescales of seconds to milliseconds. In the simplest flow method, shown schematically in figure (a), reactants are mixed at one end of a flow tube, and the composition of the reaction mixture is monitored at one or more positions further along the tube.

Scheme 1: Preparation of trifluoromethyl ethers via a chlorination/ fluorination sequence. The photochlorination which works well with electron-defi-cient anisoles cannot be applied to anisole itself. In fact, halogen attack on the phenyl ring proceeds more easily than radical chlorination of the methyl group.

Louw and FrankenCited by: Addition of hydroperoxy-alkyl radicals to molecular oxygen leads to chain branching in autoignition and engine knock, and in low temperature oxidation of paraffins. Rate constants and product channels for reaction of hydroperoxy-propyl radicals with O{sub 2} are estimated using thermodynamic properties, bimolecular quantum Kassel analysis and.

Trifluoroiodomethane 99% Synonym: Iodotrifluoromethane, Perfluoromethyl iodide, Trifluoromethyl iodide CAS Number Empirical Formula (Hill Notation) CF 3 I. Molecular Weight Beilstein/REAXYS Number EC Number MDL number MFCD PubChem Substance ID NACRES NA The U.S.

Department of Energy's Office of Scientific and Technical Information. Infrared absorption spectroscopy and chemical kinetics of free radicals. Progress report, February 1, March 1, Progress report, February 1, March 1, Full RecordAuthor: R.F. Curl, G.P. Glass.

Scheme 8: Radical Trifluoromethylation with Lithium Enolates R 1 O R 2 LDA ( eq.) THF, oC, 60 min Li R CF 3I (5 eq.) Et 3B ( eq.)oC CF 3 60 62 3 O CF 3 O CF 3 tBu O Ph CF 3 81% ~1 s 71% ~1 s 43% ~1 s Although the addition to a trifluoromethyl radical has proven difficult to.

Hydrogen-Bonding Effects on the Properties of Phenoxyl Radicals. An EPR, Kinetic, and Computational Study. Journal of the American Chemical Society(27), DOI: /jak.

Sara Goldstein, Amram Samuni, and, Angelo by: @article{osti_, title = {Crossed beam reactive scattering of oxygen atoms and surface scattering studies of gaseous condensation}, author = {Sibener, S J}, abstractNote = {A high pressure, radio frequency discharge nozzle beam source was developed for the production of very intense (greater than or equal to 10/sup 18/ atoms sr/sup -1/ sec/sup -1/) supersonic beams of oxygen atoms.

The trifluoromethyl (-CF 3) group is one of the most powerful electron withdrawing groups in structural organic chemistry. 1 This property is often manifested by increasing reactivities of adjacent acidic or electrophilic functional groups.

The -CF 3 group primarily activates electrophilic sites by inductive electron withdrawing effects. Similar electrophilic activation has been observed from Cited by: studies in the area of direct C-H arylation of heterocycles (19) and quinones (20) using radicals derived from boronic acid pre-cursors.

Aromatic heterocycles containing the trifluoromethyl group represent an important subsection of molecules of practi-cal interest, particularly for Cited by:. reardon, joseph daniel, "the kinetics and mechanism of the gas phase reaction of trifluoromethyl radicals with acetone" ().

Doctoral Dissertations. AAIAuthor: Joseph Daniel Reardon.A mild and fast continuous-flow trifluoromethylation of coumarins with CF 3 radical derived from CF 3 SO 2 Na and TBHP Xiaodan Zhang, Ping Huang, Yaming Li* and Chunying Duan State Key Laboratory of Fine Chemicals, Dalian University of Technology DalianChina Tel./fax: +86 ; E-mail: [email protected] Content.Analysis of Kinetic Reaction Mechanisms (Book), Computer Codes for the Study of Complex Reaction Systems, Tamás Turányi, Alison S.

TomlinppDate: 08 Sep NOx cycle and the tropospheric ozone isotope anomaly: an experimental investigation, G. Michalski, S.

K. Bhattacharya, and G. Girsch, Atmos. Chem. Phys., 14, –