bluuebunny/crossref_metadata_2025_split huggingface dataset:
Photochemical Reactions of Aromatic Compounds. XLII. Photosensitized Reactions of Some Selected Diarylcyclobutanes by Aromatic Nitriles and Chloranil. Implications of Charge-Transfer Contributions on Exciplex Reactivities
Authors: Pac Chyongjin , Ohtsuki Tomohito , Shiota Yozo , Yanagida Shozo , Sakurai Hiroshi 
Published: July 2006

Abstract
Photosensitized reactions of cis- and trans-1,2-diphenylcyclobutane and cis-transoid-cis-cyclobuta[1,2-a : 4,3-a′]diindene by 1-cyanonaphthalene, 9,10-dicyanoanthrancene, 1,4-dicyanonaphthalene, and chloranil, which mainly give the ring-splitting product (styrene or indene), have been investigated to explore steric and electronic requirements of the reactions associated with charge-transfer and excitation-resonance contributions of exciplex intermediates. The reaction efficiencies increase with an increase in the electron-accepting power of the sensitizers irrespective of the spin states. The formation of 1-phenyltetralin in the photosensitized reactions of the diphenylcyclobutanes occurs from the polar singlet exciplex with the dicyanoarenes but not at all from the less polar exciplex with 1-cyanonaphthalene nor from the triplet chloranil exciplex of high charge-transfer nature. Exciplex reactivities are discussed in terms of roles of charge-transfer contributions in exciplex decay channels as well as in terms of configurational and conformational effects on orbital interactions in the cyclobutanes.
Molecular Motions in Plastic Phase of 2-Methyl-2-nitropropane, (CH3)3CNO2, by Pressure and Temperature Dependences of 1H-NMR Spin-Lattice Relaxation
Authors: Hasebe Tooru , Chihara Hideaki 
Published: July 2006

Abstract
Proton NMR spin-lattice relaxation time, T1, in the plastic phase of 2-methyl-2-nitropropane (CH3)3CNO2 was measured at 10 MHz up to 150 MPa between 262 and 320 K. The overall molecular reorientation with an activation enthalpy of ΔHr*=6.8±1.0 kJ mol−1 and an activation volume of ΔVr*=(0.07±0.02)Vm did not show significant pressure dependence up to 140 MPa, where Vm is the molar volume of (CH3)3CNO2 at 273.2 K. The self-diffusion, which was treated by the Torrey’s isotropic diffusion model, showed large pressure dependence; the activation enthalpy, ΔHd* changed from 46±4 kJ mol−1 under saturated vapor pressure of the sample to 95±8 kJ mol−1 under 100 MPa and the activation volume, ΔVd* changed from Vm at 278.0 K to 0.8Vm at 320.0 K. These results strongly suggest monovacancy mechanism for self-diffusion. The phase diagram of liquid-plastic and plastic-brittle phase transitions is also given.
Basic Study on Lithium Recovery from Lithium Containing Solution
Authors: Yoshinaga Tetsutaro , Kawano Kentaro , Imoto Hirotsugu 
Published: July 2006

Abstract
Basic study of Li recovery using high purity sodium aluminate solution as coprecipitating agent has been made. Al concentration, pH and temperature greatly affect the Li recovery, and in this study the temperature was maintained constant (25 °C). For reference lithium solution, the optimum (initial) pH obtained increased with an increase in Al concentration. Optimum pH=11.0–12.5 for [Al]=50–1000 mg dm−3. The optimum pH values obtained were lower than those in the previous work by about one pH unit. The following relationship was found between the Al concentration CAl (mg dm−3) and the optimum pH; Opt. pHexp=8.23+1.5log CAl. Furthermore, these experimental pH values were in fair agreement with the pH values calculated from the solubility product of aluminium hydroxide, Ksp (HAlO2)=[H+][AlO2−]=10−13.2, i.e., pHcalcd=9.5+log CAl. Effects of coexistent ions on Li recovery were examined. Sodium and potassium ions did not interfere, while calcium, magnesium, and monosilicate ions did. However, the interference from Ba2+ ions was small. Especially, interference by calcium and monosilicate ions were significant. Bubbling of CO2 gas into the Li solution with proper Al concentration made a remarkable improvement on Li recovery. Accordingly, the influence of water soluble carbonates on Li recovery was investigated. The carbonates (Na2CO3, K2CO3, (NH4)2CO3) used were found to be very effective for Li recovery. The addition of sodium aluminate solution (500 mg dm−3) to untreated geothermal water showed around 70% of Li recovery at the best. This incomplete recovery of lithium is due to the matrix effect of geothermal water. For reference Li solution with Al concentration of 500 mg dm−3, optimum pH was 12.5, while for Ca, SiO2-free geothermal water the same pH gave very low Li recovery. However, when a pH value of 11.5 is chosen, a remarkable increase in Li recovery was obtained (98–99%). The silica component in geothermal water interfered with the Li recovery, but the influence was relatively small. The silica in the geothermal water in this case, was polymerized and showed some buffering action, such as prevention of interference from calcium ions. This is the significant difference between poly and monosilicate ions which do not show any buffering action. The addition of sodium carbonate to the Ca,SiO2-free geothermal water caused a remarkable acceleration of the Li recovery, similar to that for the reference Li solution.
Crystal and Molecular Structure of 3-Pyrazolone Derivatives. III. 5-Amino-2-phenyl-4-(9H-thioxanthen-9-yl)-1,2-dihydro-3H-pyrazol-3-one
Authors: Kimura Michio 
Published: July 2006

Abstract
The crystal and molecular structure of 5-amino-2-phenyl-4-(9H-thioxanthen-9-yl)-1,2-dihydro-3H-pyrazol-3-one has been determined by the X-ray diffraction method to establish the predominant tautomeric form of the 3-pyrazolone ring in the solid state. The title compound, C22H17N3OS, crystallizes in the space group P21⁄c with lattice parameters: a=18.179(4), b=8.333(1), c=11.961(7) Å, β=95.88(3)°, and Z=4. The 5-amino group is intramolecularly hydrogen-bonded to the sulfur atom of the thioxanthene ring (N–H···S=3.284 Å). In the packing structure, molecules are linked to each other through hydrogen bonds between the NH of amino and C=O groups [2.849 Å] and the NH moiety and C=O group [2.939 Å] of the 3-pyrazolone ring.
A Reinterpretation for Ion Association at Micellar Surfaces Due to an Electrostatic Model
Authors: Kaneko Tetsuo 
Published: July 2006

Abstract
Ion association at the surface of a micelle is reinterpreted by considering that counter ions are bound by an electrostatic attraction with a spherical shell which is formed by the aggregation of the polar heads of amphiphilic molecules. It was found that the degree of ion association increased slightly with the increase in the aggregation number of amphiphilic molecules.
A Novel Development for the Simulater of Intermolecular Potentials
Authors: Takagi Tatsuya , Tanaka Akito , Maeda Shigeo , Matsuo Sanshiro , Fujiwara Hideaki , Sasaki Yoshio 
Published: July 2006

Abstract
A novel treatment for the estimation of intermolecular interactions is proposed, incorporating intermolecular parameters into the semiempirical MNDO MO method. These parameters vary depending on the atomic species, but are constants to be reduced to the original MNDO formalism when the atomic pair belongs to a same molecule. The core–core repulsion and the two electron integral terms were modified using these parameters. The parameters introduced have been determined so as to reproduce well the interaction energies of the different model systems of molecular interaction. The resulting parameters permit calculations of large systems with sufficient accuracy within reasonably short CPU time.
Solvent Extraction of Palladium(II) from Aqueous Chloride Media with 1,2-Bis(tert-hexylthio)ethane
Authors: Baba Yoshinari , Eguchi Toshiya , Inoue Katsutoshi 
Published: July 2006

Abstract
The extraction equilibrium and kinetics of palladium(II) extraction from an aqueous chloride media with 1,2-bis(tert-hexylthio)ethane (mixture), abbreviated as t-BHTE and denoted by B, in toluene were studied at 303 K. Palladium(II) was extracted as a 1:1 Pd : extractant complex, [PdCl2B]. The partition coefficient of this extractant was evaluated as Kd=5.5×104 for hydrochloric acid and Kd=2.5×104 for an aqueous ammonium chloride solution. The results of kinetic experiments were quantitatively explained in terms of a reaction scheme in which parallel reactions of t-BHTE with [PdCl3]− and [PdCl4]2− in an aqueous phase were the rate-determining steps:
[PdCl3]−aq.+Baq.\xrightarrowk1[PdCl2B]aq.+Cl−aq.
[PdCl4]2−aq.+Baq.\xrightarrowk2[PdCl2B]aq.+2Cl−aq.
The reaction rate constants for the above were evaluated as k1=6.4×104 dm3 mol−1 s−1 and k2=2.6×102 dm3 mol−1 s−1 for extraction from an aqueous ammonium chloride solution, and k1=6.7×104 dm3 mol−1 s−1 and k2=3.2×102 dm3 mol−1 s−1 from a hydrochloric acid solution.
Versatile Synthesis of Cyclopropanecarboxylic Acid Derivatives by the Ni(CO)4-Induced Reductive Carbonylation Reaction of gem-Dibromocyclopropanes
Authors: Hirao Toshikazu , Harano Yoshiyuki , Yamana Yoshihiro , Hamada Yuji , Nagata Shinichiro , Agawa Toshio 
Published: July 2006

Abstract
Reductive carbonylation of gem-dibromocyclopropanes was achieved by treatment with tetracarbonylnickel in the presence of alcohols, amines, thiols, or imidazole in DMF leading to the corresponding cyclopropanecarboxylic acid derivatives, respectively. Use of disulfides as an initial nucleophile resulted in carbonylation with sulfenylation at the geminal position. This method was applied to the intramolecular reductive carbonylation reaction of 2,2-dibromocyclopropanealkanols into bicyclic lactones. Nickel carbenoid and enolate complexes are assumed to be involved as key intermediates.
Regioselectivity in the Catalytic Hydrogenolysis of 7-Fluoro-1-phenylbicyclo[4.1.0]heptanes
Authors: Isogai Koji , Sakai Jun-ichi , Kosugi Katsuhiko 
Published: July 2006

Abstract
The palladium-catalyzed hydrogenolysis of 7-chloro-7-fluoro-1-phenyl-, 7-fluoro-1-phenyl-, and 7,7-difluoro-1-phenylbicyclo[4.1.0]heptane was investigated. The hydrogenolysis of the cyclopropane ring occurs at the C1–C6 bond selectively, accompanied by the elimination of the endo-halogen. The hydrogenolysis of endo-7-fluoro-1-phenylbicyclo[4.1.0]heptane proceeded rapidly to give phenylcycloheptane as a sole product, whereas exo-7-fluoro-1-phenylbicyclo[4.1.0]heptane reacted slowly to give trans-1-fluoro-2-phenylcycloheptane, accompanied by a small amount of the C1–C7 bond-cleaved product. The different reactivity between the endo and exo derivatives became more considerably by the introduction of a methyl group at the 2-position. Thus, with the compounds having 2-methyl group the endo-fluoro derivative was cleaved at the C1–C6 bond accompanied by the C1–C7 bond cleavage, whereas the exo-fluoro derivative was cleaved at the C1–C7 bond exclusively.
Studies on Glycosylation of erythro-β-Hydroxy-l-histidine. A Key Step of Bleomycin Total Synthesis
Authors: Miyake Toshiaki , Tsuchiya Tsutomu , Umezawa Sumio , Saito Seiichi , Umezawa Hamao 
Published: July 2006

Abstract
To improve the synthetic yield of bleomycin and its analogues, it is necessary to find the high yield procedure for condensation of sugar portion with the hydroxyl group of erythro-β-hydroxy-l-histidine moiety, preventing the N-glycosylation to imidazole. The present studies include the condensations of 4,6-di-O-acetyl-2,3-di-O-methyl-α-d-glucopyranosyl bromide (10) or 3,4,6-tri-O-acetyl-2-O-(2,4,6-tri-O-acetyl-3-O-carbamoyl-α-d-mannopyranosyl)-α-l-gulopyranosyl bromide (3) and 3,4,6-tri-O-acetyl-2-O-[2,4,6-tri-O-acetyl-3-O-(N-acetylcarbamoyl)-α-d-mannopyranosyl]-α-l-gulopyranosyl bromide (28) with a variety of protected derivatives of erythro-β-hydroxy-l-histidine. The results revealed that a) Nim-tosyl group is most effective to prevent the Nim-glycosylation, b) use of silver carbonate and silver perchlorate at low temperature (−55 °C) gave the desired α-glycosides in satisfactory yields, and c) among the esters (methyl and p-nitrobenzyl) and the N-protecting groups (Z, Boc, and pMZ) of erythro-β-hydroxy-l-histidine, methyl and Z were the best groups, respectively. Using the method thus improved, the desired O-α-l-guloside, that is, erythro-β-O-[3,4,6-tri-O-acetyl-2-O-(2,4,6-tri-O-acetyl-3-O-carbamoyl-α-d-mannopyranosyl)-α-l-gulopyranosyl]-Nα-benzyloxycarbonyl-Nim(τ)-tosyl-l-histidine p-nitrobenzyl ester (31) was successfully prepared.
A New Method for Measuring 1:1 Association Constants Based on Releasing Rate of Free Ligand from Aqueous into Gaseous Phase, Applied to Determining Formation Constants of Metal Acetylacetonate Complexes
Authors: Sanemasa Isao , Nishimoto Yuko , Tanaka Akira , Deguchi Toshio 
Published: July 2006

Abstract
A simple method is presented that allows estimation of 1:1 association constants between volatile and nonvolatile solutes in aqueous medium. On introducing an inert gas at a constant flow rate into the aqueous phase, the volatile solute is expelled from the solution, and the amount of the released solute is measured as a function of aeration time. Measurements are made in two separate runs at the same inert gas flow rate, one in the absence and the other in the presence of nonvolatile solutes. The releasing rate of the volatile solute is reduced with increasing association between both the solutes in the aqueous medium. The method was used to estimate formation constants of 1:1 acetylacetone complexes with metal ions, Cu(II), Ni(II), Co(II), Mg(II), Fe(II), Fe(III), and Al(III), at 25.0°C and I=0.1 (NaClO4), results being compared with literature values.
Synthesis of Photosensitive Poly(2,5-Norbornadien-7-yl Acrylate and Methacrylate)
Authors: Kamogawa Hiroyoshi , Yamada Makoto 
Published: July 2006

Abstract
2,5-Norbornadien-7-yl acrylate and methacrylate were synthesized by the esterification of 2,5-norbornadien-7-ol with acryloyl and methacryloyl chlorides, respectively. Polymerization of the monomers with AIBN provided vinyl polymers with pendant norbornadiene units, which could be made to clear films from CH2Cl2. UV-irradiations brought about remarkable changes in the 200 nm region of the absorption spectra of the films, indicating the formation of quadricyclane units. These could be partially converted back by immersion in a cobalt(II) 5,10,15,20-tetraphenylporphyrin solution.
Copper(I), Silver(I), Mercury(II), and Palladium(II) Complexes of Tetrathia[n]ferrocenophanes
Authors: Sato Masaru , Tanaka Shinsuke , Akabori Sadatoshi , Habata Yoichi 
Published: July 2006

Abstract
The complexes of a series of macrocyclic tetrathioether ligands containing a ferrocene nucleus in the macrocycle, tetrathia[n]ferrocenophanes, with copper(I), silver(I), mercury(II), and palladium(II) salts were prepared and characterized. The stability of complexes seems to depend on the size of the macrocycles in tetrathia[n]ferrocenophanes. The interaction between the iron atom of a ferrocene nucleus and the metal ions incorporated in the macrocycles seems to be negligible in these complexes.
Compensation Effect in the Electrical Conduction Process in Some Nucleic Acid Base Complexes with Acriflavine Dye
Authors: Sarkar Deepali , Jain Kapur Mal , Misra Tridibendra Narayan 
Published: July 2006

Abstract
The validity of the compensation rule is studied for nucleic acid bases, adenine, cytosine, and uracil complexes with acriflavine dye. The value of the semiconduction activation energy of a complex varies with dye concentration. It is shown that at low dye concentration, these semiconducting complexes follow the three parameter equation σ(T)=σ′0exp(E⁄2kT0)exp(−E⁄2kT), where σ′0 and T0 are constant for a particular base, other notations have their usual meaning. Consistent values for σ′0 and T0 have been obtained by using various methods of evaluation. These results suggest that compensation effect has a physical origin.
Determination of Iron in Drug Biochemical and Biological Samples as a Thiocyanato Mixed Ligand Complex with Hydroxyamidine
Authors: Singh Raghunandan , Chandrakar Lalta Prasad , Mishra Rajendra Kumar 
Published: July 2006

Abstract
N-Hydroxy-N-o-tolyl-N′-phenylbenzamidine (HTPB) is presented as a new sensitive and highly selective reagent for determination of iron in drug, biochemical and biological samples in presence of thiocyanate. The red organge Fe(III)–HTPB–SCN mixed ligand complex is quantitatively extracted into benzene. The extraction of iron(III) as thiocyanato mixed ligand complex is quantitative in the acidity range between 0.2–0.7 M (1M=1 mol dm−3) hydrochloric acid. The effective molar absorptivity of the complex is 12000 l mol−1 cm−1 with Sandell’s sensitivity of 0.0046 μg of iron per cm2. On the basis of this sensitive color reaction, a simple, rapid, selective, and highly reproducible method for the extractive spectrophotometric determination of microgram amounts of iron in various drug, biochemical and biological samples has been developed. The method is free from most of the common metal ions and commonly used sequestering agents.
Synthesis of Standardized Building Blocks as a β-d-Mannosyl Donors with a Temporary Protection to be 3,6-Di-O-glycosyl Acceptors, for Constructing the Inner Core of Glycoproteins and Artificial Antigens
Authors: El Ashry El Sayed H , Schuerch Conrad 
Published: July 2006

Abstract
A synthetic scheme has been achieved for the core block of glycoproteins having d-mannose configuration, which is standardized to be a 3,6-di-O-glycosyl acceptor and react stereoselectively as a β-d-mannosyl donor. The synthesis was started by methyl 2,3-O-isopropylidene-α-d-mannopyranoside, which upon benzylation, deisopropylidenation, and selective acetolysis of the 6-O-benzyl group afforded the corresponding tetraacetate, which could be converted to 3,6-di-O-allyl-4-O-benzyl-1,2-O-(1-methoxyethylidene)-β-d-mannopyranose. The orthoester could be separated into the exo and endo isomers. Hydrolysis of the orthoester ring followed by reaction with mesyl chloride gave 3,6-di-O-allyl-4-O-benzyl-2-O-mesytl-α-d-mannopyranosyl chloride, that upon reaction via its 1-O-trifluoroethanesulfonate with 2-[4-(p-toluenesulfonamido)phenyl]ethanol gave the corresponding glycosides in β:α ratio of 3:1. Deallylation of the β-glycosides gave the diol which are suitable for branching and could react selectively at the 6-position allowing its potential for glycosylation by different glycosyl donors.
Silver cis-Tetrachlorohydroxonitrosylruthenate (2–)
Authors: Kamata Yasuhiro , Miki Eiichi , Mizumachi Kunihiko , Ishimori Tatsujiro 
Published: July 2006

Abstract
A new chloronitrosylruthenate ion was separated from the hydrolysis mixture of [RuCl5(NO)]2− by the anion-exchange method, and it formed Ag2[RuCl4(OH)(NO)] on the addition of silver nitrate. The anion of the silver salt was found to have the cis form on the basis of its IR spectrum.
Photochemical Isomerization of 2-Pyridyl- and 2-Pyrazinyl-1,2-benzisothiazol-3(2H)-ones
Authors: Kamigata Nobumasa , Iizuka Hirokazu , Kobayashi Michio 
Published: July 2006

Abstract
The irradiation of 2-pyridyl- and 2-pyrazinyl-1,2-benzisothiazol-3(2H)-ones in benzene resulted in the formation of benzopyrido- and benzopyrazinothiazepinones, respectively. A mechanism involving a biradical species is proposed for this reaction.
Spin-Equilibrium Behavior in Solution of an Iron(III) Complex [Bis[3-(3-methoxysalicylideneamine)propyl]amino-O,N,N′,N″,O′](pyridine)iron(III) Tetraphenylborate
Authors: Ohyoshi Akira , Honbo Jukichi , Matsumoto Naohide , Ohta Shoichi , Sakamoto Shingo 
Published: July 2006

Abstract
The title iron(III) complex with a spin equilibrium between high-spin(S=5/2) and low-spin(S=1/2) has been investigated by means of the temperature dependences of the magnetic susceptibilities (the Evans 1H NMR technique), the electronic spectra, and the cyclic voltammetry. The pure electronic spectra for high-spin and low-spin species were evaluated from the observed electronic spectra and the equilibrium constants obtained from the magnetic data. The electron-transfer entropy for the Fe3++e→Fe2+ process(ΔSet) was obtained as 205 JK−1 mol−1 from the temperature dependence of the cyclic voltammogram.
The Microwave Spectrum of (E)-(Propinaldehyde Oxime)
Authors: Yoshida Kazuhiko , Sakaizumi Takeshi , Ohashi Osamu , Yamaguchi Ichiro 
Published: July 2006

Abstract
Microwave spectra of propionaldehyde oxime and its deuterated derivatives (CH3CH2CH=NOD) were observed in the frequency region from 10 to 35 GHz. Several a-type R-branch transitions were identified and the following rotational constants(MHz) in the vibrationally ground state were determined to be: A=19400±400, B=2278.16±0.03, and C=2204.09±0.03 for the normal species, and A=19000±400, B=2194.31±0.02, and C=2128.40±0.02 for the deuterated species. The spectrum analyzed in this work has been concluded from the rotational constants to be due to a ac,E-conformer.
Site-Selective Photochemical Ene Reaction of 2-Methylene-1,2-dihydronaphthalene
Authors: Sugimoto Akira , Sakamoto Satoshi , Suyama Kanji , Yoneda Shigeo 
Published: July 2006

Abstract
The title compound, formed by the photolysis of 2-(2-anilinoethyl)naphthalene, reacted with olefins having a conjugated double bond to give an ene reaction product under irradiation conditions.
Hydrolysis of p-Nitrophenyl Hexanoate in Hydrophobic Aggregate System
Authors: Kodaka Masato , Fukaya Toshio , Kikkawa Masayoshi 
Published: July 2006

Abstract
Hydrolysis of p-nitrophenyl hexanoate in the presence of azide ion (N3−) was accelerated by tetraheptylammonium bromide (1), which has four long alkyl chains. In contrast to 1, the other tetraalkylammonium salts which have shorter alkyl chains, (2)–(5), did not elevate the reactivity. p-Nitrophenyl acetate, less hydrophobic substrate, was not hydrolyzed so efficiently even in the presence of 1.
Reductive and Regioselective Cleavage of Oxetanes Assisted by the Neighboring Hydroxyl
Authors: Kato Michiharu , Kitahara Haruo , Yoshikoshi Akira 
Published: July 2006

Abstract
On exposure to lithium aluminium hydride, 1,6-dioxadispiro[2.0.3.4]undecane and 5-methl-2-oxaspiro[3.5]nonan-5-ol gave 1,2-dimethyl-c-2-(hydroxymethyl)-r-1-cyclohexanol (5) which was produced from regioselective C–O bond cleavage of oxetane rings by an intramolecular attack of hydride. The stereochemistry of 5 was confirmed by an unambiguous synthesis based on the Sharpless oxidation of 1-methyl-2-methylenecyclohexanemethanol.
Effective Synthesis of 2-[4-(3-Methyl-2-butenyl)phenyl]propionic Acid via Hydromagnesation Reaction with Nickel or Titanium Catalysts
Authors: Amano Takehiro , Ota Tomomi , Yoshikawa Kensei , Sano Tatsuhiko , Ohuchi Yutaka , Sato Fumie , Shiono Manzo , Fujita Yoshiji 
Published: July 2006

Abstract
2-[4-(3-Methyl-2-butenyl)phenyl]propionic acid was synthesized in 82% yield via nickel(II) chloride or dichlorobis[η5-cyclopentadienyl]titanium-catalyzed hydromagnesation of 1-(3-methyl-2-butenyl)-4-vinylbenzene obtained in ca. 63–68% yield by the coupling reaction of 4-(3-methyl-2-butenyl)phenylmagnesium chloride with vinyl chloride.
A Study of the Reactivity of Surface-Adsorbed Oxygen Species with C2H6 on V2O5/SiO2
Authors: Iwamatsu Eiji , Aika Ken-ichi , Onishi Takaharu 
Published: July 2006

Abstract
The properties and reactivities of surface oxygen species including O− on V2O5/SiO2 were studied in connection with the oxidative dehydrogenation of C2H6 by N2O. O− was formed through N2O on reduced V2O5 supported on SiO2 which had been prepared from tetraethyl silicate, whereas it was not formed on V2O5 supported on SiO2 obtained from other sources. One mole of O− on V2O5/SiO2 was found to react with one mole of C2H6 at 298K. No oxygen species other than O− reacted with C2H6 at 298K. The surface reaction mechanism was discussed, and ethoxide was considered to be one of the surface intermediates. All the other surface oxygens but O− reacted with C2H6 above 573K. Since a catalytic oxidative dehydrogenation reaction of C2H6 was active above 573K, the surface oxygens other than O− were considered to be responsible for this reaction. The possibility of O− as the reaction intermediate was also discussed.