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2229-07-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 2229-07-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,2,2 and 9 respectively; the second part has 2 digits, 0 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 2229-07:
(6*2)+(5*2)+(4*2)+(3*9)+(2*0)+(1*7)=64
64 % 10 = 4
So 2229-07-4 is a valid CAS Registry Number.
InChI:InChI=1/CH3/h1H3

2229-07-4SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 19, 2017

Revision Date: Aug 19, 2017

1.Identification

1.1 GHS Product identifier

Product name methyl

1.2 Other means of identification

Product number -
Other names Methyl-Radikalen

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:2229-07-4 SDS

2229-07-4Relevant articles and documents

Photolysis of Acetyl Benzoyl Peroxide Isolated in an Argon Matrix: The Stability of the Benzoyloxy and Acetoxy Radicals toward Decarboxylation

Pacansky, J.,Brown, D. W.

, p. 1553 - 1559 (1983)

Exposure of matrix-isolated acetyl benzoyl peroxide to UV light (λ > 2800 angstroem) produces methyl benzoate, the methyl-phenyl radical pair, and carbon dioxide.The results of the low-temperature irradiation reveal that methyl benzoate is formed by recombination of the benzoyloxy-methyl radical pair.Since phenyl acetate was not detected during the low-temperature irradiation, it was concluded that the lifetime of the acetoxy-phenyl radical pair is too short to allow concentrations that could be detected by infrared spectroscopy.Ab initio calculations are used to provide an explanation for the dramatic lifetime differences between the benzoyloxy and acetoxy radicals.In addition, it was shown that electronic excitation of the phenyl radical does not induce a chemical reaction with carbon dioxide.Arguments based on experiment and theory are presented to explain this unexpected result.

Photoinduced reactions of methyl radical in solid parahydrogen

Fushitani, Mizuho,Sogoshi, Norihito,Wakabayashi, Tomonari,Momose, Takamasa,Shida, Tadamasa

, p. 6346 - 6350 (1998)

Photolysis of methyl iodide in solid parahydrogen (p-H2) at about 5 K is studied with ultraviolet light at 253.7 and 184.9 nm. It is found that the light at 253.7 nm produces only methyl radical, whereas the light at 184.9 nm yields both methyl radical and methane. The mechanism of the formation of the photoproducts is elucidated by analyzing the temporal behavior of the observed vibrational absorption. It is concluded that methyl radical in the ground state does not react with p-H2 molecules appreciably but that the radical in the electronic excited state of B(2A1′), accessible by reabsorption of 184.9 nm photons by the radical, decomposes to a singlet methylene CH2 a(1A1) and a hydrogen atom (2S) and that the singlet methylene reacts with a p-H2 molecule to give methane.

Microwave kinetic spectroscopy of reaction intermediates: O + ethylene reaction at low pressure

Endo, Yasuki,Tsuchiya, Soji,Yamada, Chikashi,Hirota, Eizi,Koda, Seiichiro

, p. 4446 - 4452 (1986)

A microwave spectroscopic method has been developed to study elementary reactions in real time through in situ observation of rotational spectra of reaction intermediates such as free radicals with lifetime as short as 1 ms.This method was applied to the O(3P) + ethylene reaction in order to assess the roles of (a) vinoxy + H and (b) CH3 + CHO channels in the initial process.The reaction was initiated by irradiating an N2O/C2H4 mixture containing a trace amount of mercury with the 253.7 nm mercury resonance line, and the time evolution of vinoxy, HCO, and H2CO was followed by measuring their microwave absorption intensities as functions of time.The branching ratio was thus determined to be 0.4 +/- 0.1 and 0.5 +/- 0.1 for (a) and (b), respectively, at the sample pressure of 30 mTorr.The present result agrees with those obtained by Hunziker et al. using much higher pressures of samples, but is not compatible with the observation of Buss et al. that (a) is dominant in collision-free conditions.

Rate parameters for the reaction of atomic hydrogen with dimethyl ether and dimethyl sulfide

Lee, J. H.,Machen, R. C.,Nava, D. F.,Stief, L. J.

, p. 2839 - 2844 (1981)

Absolute rate constants for the reaction of atomic hydrogen with dimethyl ether (DME) and dimethyl sulfide (DMS) were obtained using the flash photolysis-resonance fluorescence technique.Under conditions where secondary reactions are avoided, rate constants for the H + DME reaction over the temperature range 273-426 K are well represented by the Arrhenius expression k1 = (4.38 +/- 0.59) * 10-12 exp( - 1956 +/- 43/T) cm3 molecule-1 s-1.The corresponding Arrhenius expression for the H + DMS reaction over the temperature range 212-500 K is k2 = (1.30 +/- 0.43) * 10-11 exp( -1118 +/- 81/T) cm3 molecule-1 s-1.The Arrhenius plot for k2 shows signs of curvature, however, and separate Arrhenius expressions are derived for the data above and below room temperature.These results are discussed and comparisons are made with previous determinations which employed flow discharge and product analysis techniques.

Time-Resolved Observation of Sequential Bond Cleavage in a Gas-Phase Azoalkane

Adams, J. Stephen,Burton, Katherine A.,Andrews, B. Kim,Weisman, R. Bruce,Engel, Paul S.

, p. 7935 - 7938 (1986)

The gas-phase photodissociation of an unsymmetrical azoalkane, 3-(methylazo)-3-methyl-1-butene, was studied with time-resolved coherent anti-Stokes Raman spectroscopy (CARS) to probe for product formation.Appearance kinetics were measured for all three primary photoproducts.The results indicate a two-step dissociation mechanism in which the 1,1-dimethylallyl fragment is formed within 2 ns of excitation, whereas the methyl radical and N2 are formed through decay of reaction intermediate having a lifetime of 12 +/- 2 ns.These findings mark the first direct demonstration of a stepwise homolysis mechanism for an azoalkane.

Absolute rate constants and Arrhenius parameters for the addition of the methyl radical to unsaturated compounds: The methyl affinities revisited

Zytowski, Torsten,Fischer, Hanns

, p. 12869 - 12878 (1997)

Absolute rate constants and their Arrhenius parameters are reported for the addition of the methyl radical to 21 monosubstituted and 1,1- disubstituted alkenes and to 6 benzenes in 1,1,2-trifluoro-1,2,2- trichloroethane solution. They are used to convert relative reaction rates known as methyl affinities from the work of M. Szwarc and others for about 250 additional unsaturated compounds to the absolute scale. An analysis shows that the addition rates depend on the reaction enthalpy but also indicates a moderate nucleophilic polar effect for the liquid-phase reactions. It is pointed out that this polar effect may be smaller in the gas phase.

-

Leighton,Mortensen

, p. 448 (1936)

-

Studies on the Reaction of Acetaldehyde and Acetyl Radicals with Atomic Hydrogen

Ohmori, Kenji,Miyoshi, Akira,Matsui, Hiroyuki,Washida, Nobuaki

, p. 3253 - 3255 (1990)

The reaction of acetaldehyde and acetyl radical with atomic hydrogen was studied with a discharge flow tube equipped with an electron-impact mass spectrometer.Experiments were performed under the condition of excess atomic hydrogen at 299 +/- 5 K.A rate constant for the reaction CH3CHO + H -> CH3CO + H2 (1) of (11 +/- 2) * 10-14 cm3 molecule-1 s-1 was obtained.The branching fractions for the subsequent reactions (2a) CH3CO + H -> CH3 + HCO and (2b) CH3CO + H -> CH2CO + H2 are found to be 65 +/- 4percent and 35 +/- 2percent, respectively.

The β C-C bond scission in alkoxy radicals: Thermal unimolecular decomposition of t-butoxy radicals

Fittschen, Christa,Hippler, Horst,Viskolcz, Bela

, p. 1677 - 1683 (2000)

The temperature and pressure dependence of the unimolecular decomposition of t-butoxy radicals was studied by the laser photolysis/laser induced fluorescence technique. Experiments have been performed at total pressures between 0.04 and 60 bar of helium and in the temperature range 323- 383 K. The low and the high pressure limiting rate constants as well as the broadening factor F(c) have been extracted from a complete falloff analysis of the experimental results: k0 = [He] x 1.5 x 10-8 exp(- 38.5 kJ mol- 1/RT) cm3 s-1, k∞ = 1.0 x 1014 exp(-60.5 kJ mol-1/RT) s-1, and F(c) = 0.87 - T/870 K. We anticipate an uncertainty for these rate constants of ± 30%. Important features of the potential energy surface have been computed by ab initio methods. The Arrhenius parameters for the high pressure limiting rate constant for the β C-C bond scission of t-butoxy radicals have been computed from the properties of a transition state based on the results of G2(MP2) ab initio calculation. The results from density functional theory (DFT) with a small basis set (B3LYP/SVP) are very similar. Excellent agreement between the calculated and the experimental rate constants has been found. We suggest a common pre-exponential factor for β C-C bond scission rate constants of all alkoxy radicals of A = 10(14±0.3) s-1. Thus we express the high pressure limiting rate constant for ethoxy and i-propoxy radicals by k∞ = 1.0 x 1014 exp(-78.2 kJ mol-1/RT) and 1.0 x 1014 exp(-63.1 kJ mol-1/RT) s-1, respectively. For the reverse reactions, the addition of CH3 radicals to CH2O, CH3CHO, and (CH3)2CO, we obtained activation enthalpies of 32, 42, and 52 kJ mol-1, respectively.

Vacuum ultraviolet photochemistry of CH4 and isotopomers. II. Product channel fields and absorption spectra

Wang, Jen-Han,Liu, Kopin,Min, Zhiyuan,Su, Hongmei,Bersohn, Richard,Preses, Jack,Larese, John Z.

, p. 4146 - 4152 (2000)

Methyl and methylene fragments are achieved using a complete set of quantum yields for different photodissociation channels. The results depicted that the hydrogen (H) atoms are more abundant in photofragments than deuterium (D) atoms. The ultraviolet absorption spectrum of methane is identical at different temperatures. The quantum yields of H atoms are determined by the measurement of the ratio of areas under the laser-induced fluorescence excitation curves.

Anastasi, Christopher,Hancock, Denise U.

, (1988)

Ultraviolet photodissociation study of CH3SCH3 and CH3SSCH3

Lee, Y. R.,Chiu, C. L.,Lin, S. M.

, p. 7376 - 7384 (1994)

The photodissociation processes of CH3SSCH3 at 248 and 193 nm and CH3SCH3 at 193 nm have been studied by translational spectroscopy.When excited at 248 nm, CH3SSCH3 undergoes a simple S-S bond scission to produce two CH3S fragments with an average translational energy of 33 kcal/mol.The angular distribution of the product with respect to the polarized laser is measured and fitted with an anisotropy parameter β=1.2.It indicates that the dissociation is a fast, direct process.At 193 nm, there is only a simple dissociation channel for CH3SCH3, while CH3SSCH3 undergoes a predominant C-S bond scission with the S-S bond scission as a minor channel.No angular dependence for the primary products from both CH3SCH3 and CH3SSCH3 has been observed.The observation of S+2 time-of-flight spectra shows that a major fraction of CH3S2, which is internally excited when produced, undergoes spontaneous dissociation to form slow S2 and CH3 radicals.Results obtained for the dissociation processes of both molecules at 193 nm are rationalized and comparisons with previous investigations are also included.

Diffuse Reflectance Infrared Fourier-transform Study of the Plasma Hydrogenation of Diamond Surfaces

Ando, Toshihiro,Ishii, Motohiko,Kamo, Mutsukazu,Sato, Yoichiro

, p. 1383 - 1386 (1993)

Plasma hydrogenation of diamond surfaces was investigated using a diffuse reflectance infrared Fourier-transform (DRIFT) technique.Hydrogenation was carried out under microwave plasma conditions similar to those used for the chemical vapour deposition of diamond.Surface species chemisorbed on the diamond surface were characterized by DRIFT spectroscopy.The number of hydrogen-carbon bonds increased and the structure of the chemisorbed species on the diamond surfaces changed on increasing the temperature of the plasma hydrogenation.

Photofragment imaging of methane

Heck,Zare,Chandler

, p. 4019 - 4030 (1996)

The channels leading to the formation of atomic and/or molecular hydrogen in the photolysis of methane are studied. The H-atom elimination is investigated following photolysis at Lyman-α. The H2 elimination is investigated following two-photon

Solvent effects on the competitive β-scission and hydrogen atom abstraction reactions of the cumyloxyl radical. resolution of a long-standing problem

Avila, David V.,Brown,Ingold,Lusztyk

, p. 466 - 470 (1993)

Laser flash photolysis (LPF) techniques with detection in the infrared and in UV-visible regions of the spectrum have been used in combination with detailed product studies to assess solvent effects on the hydrogen abstraction and β-scission reactions of cumyloxyl radicals. The variation in the ratio of the products of these two competing processes in solvents with different polarities is due to the solvent's influence on β-scission. The rate constants for β-scission at 30°C, kβCumO, were (2.63 ± 0.24) × 105, and (19.6 ± 3.4 × 105s-1 in CCl4, C6H6, C6H5Cl, (CH3)3COH, CH3CN, and CH3COOH, respectively. The rate constant for hydrogen abstraction from cyclohexane were essentially identical in these six solvents, viz., kaCumO = (1.24 ± 0.12) × 106 M-1 s-1. There is a reasonably good linear correlation between log (kβCumO/s-1) and certain cybotactic solvent parameters indicating that solvent effect on kβCumO are due to a localized interaction between the transition state for β-scission and adjacent solvent.

A radioactive tracer method for the analysis of mixtures of short-lived free radicals.

DURHAM,MARTIN,SUTTON

, p. 1052 - 1052 (1949)

-

Cathodic cleavage of heteroarylalkylsulfones: A facile route to long chain aliphatic sulfinates and relevant sulfones

Delaunay,Mabon,Chaquiq El Badre,Orliac,Simonet

, p. 2149 - 2150 (1992)

Heteroarylalkylsulfones - mainly pyridylalkylsulfones - exhibit a cathodic cleavage reaction producing alkanesulfinate anion in high yield. This reaction is tested with long chain alkyl groups and allows an easy synthesis of aliphatic sulfinic acids.

Adsorption and Decomposition of Methanol on NiAl(110)

Sheu, Bor-Ru,Chaturvedi, S.,Strongin, D. R.

, p. 10258 - 10268 (1994)

Methanol adsorption and reaction on NiAl(110) have been investigated with temperature-programmed desorption, X-ray and ultraviolet photoelectron spectroscopy, and high-resolution electron energy loss spectroscopy.Methanol chemisorbs associatively (at least relatively high coverage) on NiAl(110) at 120 K and transforms into surface methoxy by 200 K.Decomposition of the methoxy overlayer leads to the evolution of gaseous H2, CO, CH4, and CH3 radicals, in addition to the deposition of surface oxygen and carbonaceous species.The formation of C2H4 is also observed after a high coverage of methoxy decomposes on NiAl(119).Methyl radical desorption occurs near 570 K and CH4 desorbs near 350 K from NiAl(110).The low-temperature CH4 desorption peak indicates that the C-O bond of a fraction of surface methoxy is cleaved below 350 K on NiAl(110), in contrast to monometallic Al and Ni, emphasizing the unique reactivity of this alloy surface.

Kinetics of the Reaction of CH3S with O3 at 298 K

Tyndall, G. S.,Ravishankara, A. R.

, p. 4707 - 4710 (1989)

Laser-induced fluorescence was used to detect CH3S radicals in the laser flash photolysis of CH3SH-O3-H2O-He(SF6) mixtures.Evidence was found for a reaction between CH3S and O3, with a rate coefficient (4.1+/-2.0)x10E-12 cm3 molecule-1s-1.The yield of CH3S from the reaction OH + CH3SH was determined to be 1.1+/-0.2.Our results suggest that the CH3S + O3 reaction could be the major sink for CH3S in the atmosphere.

Photo-tautomerization of acetaldehyde to vinyl alcohol: A potential route to tropospheric acids

Andrews, Duncan U.,Heazlewood, Brianna R.,Maccarone, Alan T.,Conroy, Trent,Payne, Richard J.,Jordan, Meredith J. T.,Kable, Scott H.

, p. 1203 - 1206 (2012/10/29)

Current atmospheric models underestimate the production of organic acids in the troposphere. We report a detailed kinetic model of the photochemistry of acetaldehyde (ethanal) under tropospheric conditions. The rate constants are benchmarked to collision-free experiments, where extensive photo-isomerization is observed upon irradiation with actinic ultraviolet radiation (310 to 330 nanometers). The model quantitatively reproduces the experiments and shows unequivocally that keto-enol photo-tautomerization, forming vinyl alcohol (ethenol), is the crucial first step. When collisions at atmospheric pressure are included, the model quantitatively reproduces previously reported quantum yields for photodissociation at all pressures and wavelengths. The model also predicts that 21 ± 4% of the initially excited acetaldehyde forms stable vinyl alcohol, a known precursor to organic acid formation, which may help to account for the production of organic acids in the troposphere.

Phenol-based lipophilic fluorescent antioxidant indicators: A rational approach

Krumova, Katerina,Oleynik, Paul,Karam, Pierre,Cosa, Gonzalo

scheme or table, p. 3641 - 3651 (2009/10/02)

(Chemical Equation Presented) The reactivity, electrochemistry, and photophysics of the novel antioxidant indicator B-TOH, a BODIPY-α- tocopherol adduct, were investigated. We also studied a newly prepared BODIPY-3,5-di-tert-butyl-4-hydroxybenzoic acid ad

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