bluuebunny/crossref_metadata_2025_split huggingface dataset:
ON THE DIBASIC ACIDS IN JAPAN WAX
Authors: Tsujimoto Mitsumaru 
Published: July 2006

Abstract
(1) As “japanic acid” of Geitel and van der Want appears not the only dibasic acid in Japan wax, this name has been reserved for a while, and the expression of the “Japan wax dibasic acids” or more simply the “dibasic acids” is used in this paper.
(2) Basing on the difficult solubility of the dibasic acids in petroleum ether, a method for their approximate determination has been proposed. The results obtained by this method show that the content of the dibasic acids in the mixed fatty acids of Japan wax amounts to 5–6%, which are far greater than hitherto considered.
(3) For the preparative separation of the dibasic acids, the lead salt precipitation method and the ester distillation method have been found to be most convenient.
(4) As the results of the chemical examination of the dibasic acids, it has been concluded that the main constituent of the acids is heneicosane dicarboxylic acid, C23H44O4, but probably eicosane dicarboxylic acid, C22H42O4 also occurs in a fair proportion.
(5) As a peculiar property of the dibasic acids, it has been found that the comparatively small addition of them to fatty and waxy substances makes the crystalline structure of these substances finer and more opaque, and at the same time gives certain coherency and tenacity.
(6) The characteristic property of Japan wax that it may be kneaded to a “mochi”-like mass without adhering to the fingers is due to the presence of the glycerides of the dibasic acids.
ON THE DISSOLUTION VELOCITY OF OXYGEN INTO WATER. PART IV
Authors: Miyamoto Susumu , Nakata Akira 
Published: July 2006

Abstract
(1) The oxidation velocity of sodium sulphite was studied, when the condition is satisfied, under which the concentration of oxygen in the boundary surface layer is always zero. The oxidation velocity is independent of the concentration of sodium sulphite and is proportional to the boundary surface area.
(2) The theoretical considerations on the observed oxidation velocity was given.
(3) The assumption that only the molecule of oxygen, whose component of velocity vertical to the boundary surface is greater than a threshold value u0 is able to enter into the liquid phase, was given, and the values of u0 were calculated at 15°C., 25°C. and 35°C. from the experimentally obtained result.
The calculated value of u0 is 1.65×105 cm. per sec. and is independent of the temperature within the observed region.
Mössbauer Emission Spectroscopy of 57Fe Arising from 57Mn in Metal and Oxides of Chromium
Authors: Nakada M , Watanabe Y , Endo K , Nakahara H , Sano H , Mishima K , Kubo M K , Sakai Y , Tominaga T , Asai K , Iwamoto M , Kobayashi Y , Okada T , Sakai N , Kohno I , Ambe F 
Published: July 2006

Abstract
The chemical states of 57Fe arising from 57Mn produced by the 54Cr (α, p) 57Mn reaction in the metal and oxides of chromium were studied by 57Fe Mössbauer emission spectroscopy. In chromium metal, all of the 57Fe atoms were found at substitutional sites. Both the iron(II) and iron(III) species were observed in Cr2O3, while only iron(III) ions were detected in CrO3.
Extractive Separation and Photometric Determination of Vanadium with Benzoylacetone
Authors: Chauhan Rakam Singh , Kakkar Lajpat Rai 
Published: July 2006

Abstract
A very simple and rapid method for the extractive separation and photometric determination of vanadium is worked out using benzoylacetone as a complexing reagent for V(III), produced on reduction of V(V) with sodium dithionite in dil acetic acid medium. The colored complex is extractable into benzene. The interfering effect of a large number of elements is eliminated completely leading directly to the determination of the metal ion present in traces in samples. The method is applicable to the analysis of different technical samples and the results obtained are highly reproducible. Metal to ligand ratio in the extracted species is determined as 1 : 3.
Photocyclization of Diphenylamine Studied by Time-Resolved Thermal Lensing. Heat of Reaction, Energetics, and Reactivity of Intermediates
Authors: Suzuki Tadashi , Kajii Yoshizumi , Shibuya Kazuhiko , Obi Kinichi 
Published: July 2006

Abstract
The time-resolved thermal lensing (TRTL) technique was employed to study the photocyclization of diphenylamine (DPA) to form intermediate 4a,4b-dihydrocarbazole (DHC) in methanol solution at room temperature. The heat of reaction, ΔH, was determined to be (2.6 ± 0.2) × 102 kJ mol−1 (1DPA → 1DHC): The reaction proceeds endothermically. The ring closure step proceeds on the triplet surface (3DPA* → 3DHC*). These triplet states are found to be isoenergetic by analyzing the time evolution of the TRTL signal. 3DHC* is located at 21 kJ mol−1 above 1DHC. Furthermore, two-color laser flash photolysis experiments have revealed that the photoexcitation of intermediate 1DHC leads to the recovery of parent DPA and therefore inhibits the formation of carbazole.
Ascorbic Acid: A Jaffé Interference
Authors: Viraraghavan Saroja 
Published: July 2006

Abstract
The effects of ascorbate, the interference of the Jaffé reaction was individually studied by polarography, spectrophotometry, and thin-layer chromatography. Ascorbate was incubated in 28.4 mmol dm−3 picrate blank solution in 0.51 mol dm−3 NaOH at 25.00 ± 0.02 °C and the reactivity of test solution containing ascorbate : picrate was investigated. Picramic acid formed in all ascorbate: 28.4 mmol dm−3 picrate test solutions which explained the observed positive interference of ascorbic acid. No fluorescent product was formed in ascorbate : picrate test solutions. The reactivity of ascorbate : picrate test solutions confirmed that ascorbate was a powerful reducing agent. 2-Furaldehyde which has been listed as one of the degradation products of ascorbic acid, is not identified under the experimental conditions.
One-Pot Synthesis of Optically Active Cyanohydrin Acetates from Aldehydes via Quinidine-Catalyzed Transhydrocyanation Coupled with Lipase-Catalyzed Kinetic Resolution in Organic Solvent
Authors: Inagaki Minoru , Hatanaka Akihiko , Mimura Mitsuo , Hiratake Jun , Nishioka Takaaki , Oda Jun’ichi 
Published: July 2006

Abstract
A novel one-pot synthetic method was developed for the preparation of optically active cyanohydrin acetates. Racemic cyanohydrins were generated from aldehydes and acetone cyanohydrin by quinidine-catalyzed transhydrocyanation, and the resulting cyanohydrins 2a–j were then acetylated by lipase in a stereoselective manner using isopropenyl acetate as an acylating regent. A variety of aldehydes 1a–j were successfully transformed into the corresponding cyanohydrin acetates 3a–j having 47–95% e.e. without isolating the unstable cyanohydrins 2. Moreover, the reversible nature of base-catalyzed transhydrocyanation allows for in situ racemization of the unreacted cyanohydrins and concurrent kinetic resolution by lipase enabled the preparation of (S)-3b–d with 40–82% e.e. in more than 50% yield. Polymer-supported cinchona alkaloid was also used as a catalyst for this one-pot reaction and showed the comparable chemical and optical yield to that for the soluble monomeric alkaloid. The insoluble polymer and lipase were recovered by filtration and found to have almost the same catalytic activity even after four times of reuse.
FeS2-Catalyzed Hydrocracking of α,ω-Diarylalkanes
Authors: Wei Xian-Yong , Ogata Eisuke , Niki Etsuo 
Published: July 2006

Abstract
Hydrocracking reactions of α,ω-diarylalkanes (DAAs) were carried out in the presence of FeS2 catalyst to examine the structural effect of DAAs on the reactivities of DAAs toward hydrocracking. Reactivities and reaction pathways of DAAs were found to depend not only on aromatic ring size, but also on the number of methylene between aromatic rings. Diarylmethanes were hydrocracked via Car–Calk bond scission, while the Car–Calk bond scission for 1,2-diarylethanes and 1,3-diarylpropanes seemed to be very difficult. These results could be interpreted by the hydrogen-accepting abilities of the ipso-carbons in the substrates and the resonance stabilities of the resulting arylalkyl radicals.
Crystal Structure of N-Cinnamoyl-8-oxa-6-azabicyclo[3.2.1]octan-7-one
Authors: Yamane Takashi , Ashida Tamaichi , Hashimoto Kazuhiko , Sumitomo Hiroshi 
Published: July 2006

Abstract
The crystal structure of the title compound has been determined in order to study the structure-reactivity relationship of a bicyclo compound. C15H15O3, M 257.29, monoclinic, space group P21/a, a = 24.122(6), b = 6.990(2), c = 7.800(2) Å, β = 94.27(2)°, V = 1311.5(6) Å3, Z = 4, Dx = 1.304 g cm−3, μ = 7.56 cm−1 for Kα. The final R-value is 0.062 for 1948 reflections. The molecular structure is essentially the same as that of the N-benzoyl derivative of the bicyclo compound. An elongation of the C–N bond distance in the lactam-amide moiety, which had been found in the N-benzoyl derivative, was observed and compared with that in the unmodified bicyclo compound. There seems to be little extension of the conjugation of the olefinic group to the carbonyl or phenyl groups in a cinnamoyl moiety, according to the C=C and Csp2–Csp2 distances.
The Binding Characteristics of Sodium Decyl Sulfate to Poly(l-ornithine) with 1-Alkanesulfonate Counter Ions
Authors: Satake Iwao , Uchino Koichiro , Hayakawa Katumitu , Maeda Tamaki 
Published: July 2006

Abstract
The study was made of the binding isotherms of decyl sulfate ion to poly(l-ornithine) with 1-alkanesulfonate counter ions of the chain length (n) from 3 to 7. The coil to helix transitions of polypeptide chain in these syctems were also studied. Although the binding cooperativity decreased rapidly with increasing n, the conformational change was insensitive to n.
Selectivity in Catalytic Dehydrogenation with Active Manganese Dioxide
Authors: Kimura Takahide , Fujita Mitsue , Sohmiya Hajime , Ando Takashi 
Published: July 2006

Abstract
The selectivities in the competitive dehydrogenation of alcohols, such as benzhydrol and cinnamyl alcohol, with active manganese dioxide under catalytic conditions are different from those under the usual conditions.
Stability and Resonance Energy of Azulenequinones and the Rule for Topological Charge Stabilization
Authors: Kurihara Teruo , Ishikawa Sumio , Nozoe Tetsuo 
Published: July 2006

Abstract
An examination was made of the stability and formation pathways of azulenequinones produced by oxygenation in terms of Aihara’s graph theory of aromaticity and Gimarc’s TCS rule. In view of the TCS rule, the oxygen molecule in autoxidation first attacks C-1 of the azulenes, followed by the another oxygen molecule attacking at position n in 1-carbonylated azulenes to give azulenequinones.
A New Ketyl Radical Probe. Dehalogenation of o-Halobenzophenone
Authors: Yamataka Hiroshi , Yamaguchi Kazuhiko , Takatsuka Tsutomu , Hanafusa Terukiyo 
Published: July 2006

Abstract
The reactions of o-, m-, or p-bromobenzophenone and o-iodobenzophenone with various Grignard reagents were carried out in diethyl ether at 0 °C. The product analysis showed that these halobenzophenones can be a good chemical probe to evaluate the electron-transfer ability of nucleophiles to the aromatic ketones.
Fluorescence Quenching of Europium(III) by Heteronuclear Complex Formation with Copper(II) or Nickel(II)
Authors: Sakamoto Masatomi , Hashimura Masayuki , Nakayama Yusaku , Matsumoto Akira , Okawa Hisashi 
Published: July 2006

Abstract
Fluorescent spectra of the mononuclear europium(III) complex, Eu(H2 fsaen) (NO3)·5H2O, and the heteronuclear complexes MEu(fsaen) (NO3)·nH2O (n = 4 for M = Cu(II) and n = 6 for M = Ni(II)), were compared, where H4 fsaen is a binucleating ligand, N,N′-bis (3-carboxysalicylidene)ethylenediamine. It was found that the fluorescent bands of Eu(III) observed for the mononuclear complex were significantly quenched on forming binuclear complexes.
Direct Nebulization of Sample Solution Containing Reductant for the Determination of Mercury by Inductively Coupled Plasma-Atomic Emission Spectrometry
Authors: Nakahara Taketoshi , Wasa Tamotsu 
Published: July 2006

Abstract
In order to enhance the sensitivity of mercury, the most effective reductant, tin(II) chloride was added to a mercury solution, and the mixture was immediately introduced into the plasma through a conventional pneumatic nebulizer. The attainable detection limit for mercury was inproved from 79 ng ml−1 in the untreated solutions to 1.3 ng ml−1 when tin(II) chloride was added. The present method was successfully applied to the determination of trace concentrations of mercury in several samples of waste water.
A New Estimate of Ionic Values of Viscosity B-Coefficient, NMR B′-Coefficient and the Ion-Solvent Interactions at Extended Temperatures in Aqueous Solutions
Authors: Bhattacharyya Moni Mohan 
Published: July 2006

Abstract
New estimates of ionic viscousity B-coefficient and NMR B′-coefficient have been obtained in aqueous solutions over the temperature range 0 to 95 °C by a recently developed method. The derived values for the alkali metal and halide ions have been compared with the existing ones and the discrepancies discussed. Temperature effect on the two coefficients for the simple inorganic ions has been satisfactorily discussed using the concept of the Frank and Wen model. Energy of activation for viscous flow has also been calculated using the Eyring model and three different values are obtained for each ion over the temperature range studied.
Template Synthesis and Structure of a Dinuclear Lead(II) Complex of Novel Macrocycle Derived from 2,6-Diformyl-4-methylphenol and 1,9-Diamino-3,7-diazanonane
Authors: Motoda Ken-ichiro , Sakiyama Hiroshi , Matsumoto Naohide , Okawa Hisashi , Kida Sigeo 
Published: July 2006

Abstract
The reaction of 2,6-difomyl-4-methylphenol and 1,9-diamino-3,7-diazanonane in methanol in the presence of lead(II) ion forms a dinuclear lead(II) complex of a very rare macrocycle containing hexahydropyrimidine rings. The structure of the complex is determined by single crystal X-ray method.
Syntheses and Properties of Heterodinuclear μ-Ethynediyl Complexes Containing Palladium and Platinum
Authors: Onitsuka Kiyotaka , Joh Takashi , Takahashi Shigetoshi 
Published: July 2006

Abstract
Heterodinuclear μ-ethynediyl complexes Cl(R3P)2MC≡CM′(PR3)2Cl (3) (M = Pt, M′ = Pd; R = Me, Et, n-Bu) were prepared by the reactions of chloroethynylbis(trialkylphosphine)platinum (1) with dichlorobis(trialkylphosphine)palladium (2) in the presence of CuCl catalyst. These complexes were fully characterized by mass, 13C{1H}, and 31P{1H} NMR spectroscopies.
Selective α-Mono- and α,α-Dialkylations of 1,3-Diketones Using Solid Base Prepared from Sodium Ethoxide and Alumina
Authors: Yoshihara Nobutoshi , Kitagawa Teruhiro , Ihara Ikuko , Hasegawa Sadao , Hasegawa Tadashi 
Published: July 2006

Abstract
The alkylation of 1,3-diketones with alkyl halides using a solid base prepared from sodium ethoxide and alumina was carried out. The amount of 0.4 mol of sodium ethoxide on 50 g of alumina showed the best reactivity for alkylation. Selective mono- and dialkylation could be achieved by controlling the reaction temperature.
Photocatalytic Hydrogen Evolution from Aqueous Methanol Solution on Niobic Acid
Authors: Kudo Akihiko , Tanaka Akira , Domen Kazunari , Maruya Ken-ichi , Onishi Takaharu 
Published: July 2006

Abstract
Niobic acid powders, H3NbO4 and H8Nb6O19, obtained by hydrolysis from aqueous potassium niobate (K3NbO4 and K8Nb6O19) solutions with sulfuric acid showed a high photocatalytic activity for hydrogen evolution from an aqueous solution including methanol as a sacrificial reagent without supporting any other materials, such as Pt (quantum yield; ca. 10% at 330 nm). The activity depended on the calcination temperature. H3NbO4 powder dried at 380 K was the most active one. As the calcination temperature was increased, the H3NbO4 photocatalyst was transformed into HNbO3 (or Nb2O5·H2O) and Nb2O5 by dehydration. The BET surface area and the band gap of the powder decreased with the phase transformation. It is concluded that both the surface area and hydrated state strongly affect the activity for sacrificial hydrogen evolution on the niobic acid photocatalysts.
Ru(6,6′-Diamino-2,2′-bipyridine)32+: Effect of Interligand Steric Strain on the Spectroscopic, Photochemical, and Electrochemical Properties of the Complexes
Authors: Araki Koji , Fuse Masahiro , Kishii Noriyuki , Shiraishi Shinsaku 
Published: July 2006

Abstract
Spectroscopic, photocehmical, and electrochemical properties of a series of the Ru(II) complexes 1–4, Ru(dabp)3−n(bpy)n(BF4)2 (n = 0, 1, 2, and 3, respectively, dabp = 6,6′-diamino-2,2′-bipyridine, and bpy = 2,2′-bipyridine) having different degree of interligand steric strain caused by amino substituents of dabp were studied. Their metal-to-ligand charge transfer bands and oxidation-reduction potentials of a Ru(II)/Ru(III) couple were not so much different from each other. Though the complex 3 showed weak emission at around 630 nm (φ = 6 × 10−4), no emission of light was observed for the complexes 1 and 2. These properties and photoanation of the complexes 1 and 3 were discussed in terms of the steric and electronic effects of the amino substituents.
The Role of a Spin-Coupled Intermediate in a System Consisting of Tetraminecobalt(III) Complexes and Catechols –A Model Intermediate of Dioxygenase Reaction–
Authors: Nakashima Satoru , Ohya-Nishiguchi Hiroaki , Hirota Noboru , Tsuboyama Sei , Chijimatsu Tamiko 
Published: July 2006

Abstract
The reactions of two CoIII-tetramine (N4) complexes, cis-α-Dichloro(triethylenetetramine)cobalt(III) chloride = [CoIIICl2(trien)]Cl (1) and aquabromo[(2R, 5R, 8R, 11R)-2,5,8,11-tetraethyl-1,4,7,10-tetraazacyclododecane]cobalt(III) bromide = [CoIIIBr(Et4[12]-aneN4)(H2O)]Br2 (2) with 3,5-di-t-butylcatechol (H2dbc) have been examined by visible, NMR and ESR spectroscopies to elucidate the mechanism of the activation and the oxygenation of catechol by the complex formation. The reactions proceeded in a mixed solvent (H2O : MeOH = 1 : 1) at 50 °C in the presence and absence of dioxygen. NMR showed that the complexes react with E2dbc and dioxygen, and yield oxidatively cleavaged products. ESR measurements detected a CoIII-semiquinone (dbsq) radical and a high-spin CoII complex, regardless of the presence of dioxygen. Especially in the case of 1, the magnetic moment of the complex isolated from the anaerobic reaction solution, exhibited that there exists an antiferromagnetic spin-coupling between the high-spin (S= 3/2) CoII ion and the semiquinone radical in the complex. These results show that two species detected by ESR are in equilibrium with a high-spin CoII-dbsq binary complex formed by intramolecular electron transfer. It is conclusively clarified that the one-electron-transferred intermediate [CoII(N4)dbsq]+ is the activated intermediate, which introduces dioxygen into the semiquinone moiety.
Preparation of New Nitrogen-Bridged Heterocycles. 29. Reinvestigation on the Dehydrogenation Reaction of 5,5a-Dihydropyrido[2,1-c]thieno[3,2-e][1,4]thiazine Derivatives
Authors: Kakehi Akikazu , Ito Suketaka , Hakui Jun-ichi , Fukazawa Hiroaki 
Published: July 2006

Abstract
Reactions of the title compounds with 2,3-dichloro-4,5-dicyano-p-benzoquinone were reinvestigated; it was found that the corresponding products were not the ring-contracted and rearranged thieno[2,3-b]indolizines, as described previously by us, but were ordinary dehydrogenated compounds, pyrido[2,1-c]thieno[3,2-e][1,4]thiazines. In contrast with pyrido[2,1-c]thieno[3,2-e][1,4]thiazine derivatives which have no substituent or only one methyl group on the pyridine ring, their 6,8-dimethyl compounds could be smoothly converted by keeping them at room temperature or heating their ethanolic solution to the corresponding desulfurized or rearranged 6,8-dimethylthieno[2,3-b]indolizine derivatives in moderately to good yields. The structures of these pyrido[2,1-c]thieno[3,2-e][1,4]thiazines and thieno[2,3-b]indolizines were assigned mainly based on elemental analyses, and spectral inspections; X-ray analyses for two compounds finally confirmed the former structure, pyrido[2,1-c]thieno[3,2-e][1,4]thiazine.
Diels–Alder Reaction of (1-Methylene-2-propenyl)cobaloxime, 1-Methylene-2-propenyl-bis(dimethylglyoximato)pyridine-cobalt(III)
Authors: Tada Masaru , Shimizu Tamaki 
Published: July 2006

Abstract
(1-Methylene-2-propenyl)cobaloxime (1), a diene having a transition metal substituent, was prepared conveniently from 2-chloromagnesio-1,3-butadiene and chlorocobaloxime. Cobaloxime 1 gives Diels–Alder adducts with olefinic dienophiles (maleic anhydride, N-phenylmaleimide, p-benzoquinone, dimethyl fumarate, methyl vinyl ketone, and methyl acrylate) and acetylenic dienophiles (methyl propiolate and dimethyl acetylenedicarboxylate). The reactivity of cobaloxime 1 is higher than that of its metalloid analogs, such as 2-silyl-, 2-seleno-, and 2-stannyl-1,3-butadiene, though the reaction pattern is essentially the same. This additional activation of the diene system by cobaloxime is accounted for by a back donation of the filled d-orbital of cobalt(III) to the π-system of the diene.
Hydroacylation of Alkyl Vinyl Ketones and Acrylic Esters Using Organotetracarbonylferrates. Synthesis of 1,4-Dicarbonyl Compounds
Authors: Yamashita Masakazu , Tashika Haruyoshi , Uchida Masaya 
Published: July 2006

Abstract
Alkyl vinyl ketones and acrylic esters were hydroacylated with organotetracarbonylferrates to the corresponding 1,4-diketones and 4-oxo carboxylic acid derivatives in good yield in dipolar aprotic solvents such as N,N-dimethylacetamide. Addition of 18-crown-6 improved the yield. cis-Jasmone and γ-jasmolactone were synthesized by use of these reactions.
Synthesis of Sperm Whale Myoglobin-(77–96)-Eicosapeptide and Circular Dichroism Spectra of the Related Peptides
Authors: Hashimoto Chikao 
Published: July 2006

Abstract
Sperm whale myoglobin-(91–96)- (6a), -(85–90)- (7a), -(77–84)- (8), -(85–96)- (9a), and -(77–96)- (10) peptides were prepared. The products, derived from protected myoglobin-(91–96)-, -(85–90)-, and -(85–96)-peptides, partly changed into peptides containing a pyroglutamic acid residue in the course of purification by various forms of column chromatography. The circular dichroism (CD) spectra of free peptides 6a, 7a, 8, 9a, and 10 in 0.10 M phosphate buffers at pH 4.00, 6.50, and 8.50 were not typical of the helical structure. However, the CD spectra of peptides 7a, 9a, and 10 in 60% 2,2,2-trifluoroethanol–0.10 M phosphate buffers at the same pHs showed profiles characteristic of a helical structure.
Efficient Selenation of Quinones: Synthesis of Novel Benzo[b]naphtho[2,3-e]selenintrione and Dibenzo[b,e]seleninone
Authors: Sakakibara Makoto , Toru Takeshi , Imai Takahiro , Watanabe Yoshihiko , Ueno Yoshio 
Published: July 2006

Abstract
Selenation of 2-bromonaphthoquinone with an areneselenolate ion generated from bis(2-methoxy-carbonylphenyl) diselenide, chlorodiphenylphosphine, and LiOH afforded 2-[(2-methoxycarbonylphenyl)seleno]-1,4-naphthoquinone from which 12H-benzo[b]naphtho[2,3-e]selenin-6,11,12-trione was synthesized. 1,4-Dimethoxy-2,3-dimethyl-10H-dibenzo[b,e]selenin-10-one was prepared starting from 6-bromo-2,3-dimethylbenzoquione through the selenation and cyclization steps.
A Flash Photolysis Study of CH4–O2 Mixtures behind Shock Waves: Examination of Reaction of CH3+O2
Authors: Ohmori Kenji , Yoshimura Masabumi , Koshi Mitsuo , Matsui Hiroyuki 
Published: July 2006

Abstract
ArF laser photolysis in the mixtures of CH4 and O2 highly diluted in Ar has been conducted behind reflected shock waves, where O and H atoms have been monitored using the ARAS technique. The rate constant for the reaction CH4 + O → CH3 + OH (1) has been directly determined to be 10−8.95 ± 0.27 exp [−(15.4 ± 2.0)kcal mol−1/RT] cm3 molecule−1 s−1 over the temperature range of 1365–1840 K. Also the consecutive reactions; CH3 + O2 → CH3O + O (3a) and CH3 + O2 → CH2O + OH (3b) have been examined more directly than in previous thermally initiated experiments, and the combinations of k3a and k3b have been evaluated at the temperature range from 1622 to 1840 K.