bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Revised Structure of Dispermol and Total Synthesis of Maytenoquinone, Dispermol, and Dispermone
Authors: Matsumoto Takashi , Ohmura Taishi , Usui Shuji 
Published: July 2006

Abstract
Condensation of β-cyclocitral with 2-isopropyl-3,4-dimethoxybenzyl chloride afforded an alcohol (15) which was converted into (±)-12,13-dimethoxytotara-8,11,13-trien-6-one (18). Demethylation of (±)-18 followed by air oxidation gave (±)-maytenoquinone. Reductive cleavage of the hydroxyl group in (±)-15 produced a phenethyl derivative which was cyclized to give (±)-12,13-dimethoxytotara-8,11,13-triene (23) and its cis-isomer (24). Oxidation of (±)-23 with chromium trioxide, followed by demethylation of the resulting 7-oxo compound (25), afforded (±)-dispermone. The Wittig reaction of (R)-(−)-α-cyclocitral with 2-isopropyl-3,4-dimethoxybenzyltriphenylphosphonium chloride yielded a styrene derivative. This was partially hydrogenated and then cyclized to give (+)-23 and (−)-24. The trans-isomer (23) was converted into (−)-dispermone (3) via (−)-25 and also partially demethylated to (+)-12-methoxytotara-8,11,13-trien-13-ol (2), the proposed structure for dispermol. Since the synthetic (+)-2 was not identical with the natural compound, (−)-3 was then converted into (+)-13-methoxytotara-8,11,13-trien-12-ol, which was identical with natural dispermol. (−)-25 was also converted into (+)-maytenoquinone.
Reactions of 3-Acetyltropolone and Its Methyl Ethers with Hydrazine
Authors: Yamane Akio , Nagayoshi Masatoshi , Imafuku Kimiaki , Matsumura Hisashi 
Published: July 2006

Abstract
3-Acetyltropolone (1) was synthesized from 3-isopropenyltropolone by treatment with sodium azide in concentrated sulfuric acid. Methylation of 1 by diazomethane gave two isomers, 3-acetyl-2-methoxytropone (2a) and 2-acetyl-7-methoxytropone (2b). 1, 2a, and 2b reacted with hydrazine to give some 1,8-dihydrocycloheptapyrazol-8-one derivatives.
Solvent Assisted Oxy-Cope Rearrangement of Diastereomeric 1,5-Hexaden-3-ols. A New Industrial Process for Polyprenyl Ketones
Authors: Fujita Yoshiji , Amiya Shigetoshi , Onishi Takashi , Nishida Takashi 
Published: July 2006

Abstract
Oxy-Cope rearrangement of diastereomeric l,5-hexadien-3-ols, new key intermediates for terpenoids pio-duction in industrial scale, were investigated in neat systems and solvent assisted systems. Various solvents affecting the selectivity of [3,3]-shift were classified by means of NMR studies on hydroxyl proton exchange time.
A Study of the Interactions between Free Radicals and Cobalt Complexes
Authors: Yoshino Kenji , Ohkatsu Yasukazu , Tsuruta Teiji 
Published: July 2006

Abstract
The interaction between free radicals and cobalt complexes (Co(II)TPP and Co(II)(sal)2(R-CHXDA)) has been studied using (S,S)-(−)-, (R,R)-(+)-, and meso-1,1′-diphenylazoethane as a radical source. The decomposition of meso-1,1′-diphenylazoethane by heat or UV-light in the presence of Co(II)(sal)2(R-CHXDA) having an asymmetric ligand produced an optically active (+)-2,3-diphenylbutane. The suggestion is that the α-methylbenzyl radical formed from the azo compound is stereoselectively stabilized by the Co(II)(sal)2(R-CHXDA).
Absorption Spectra of Heterocyclic Compounds. Some 6-Hydroxy[1,3,4]thiadiazolo[2,3-b]benzimidazoles and Their Quaternary Derivatives
Authors: Soni R P , Saxena J P 
Published: July 2006

Abstract
Some 2-alkyl-6-hydroxy[1,3,4]thiadiazolo[2,3-b]benzimidazoles have been synthesised. Their absorption spectra at different pH show bathochromic shift of the absorption band in the longer wavelengths, which is more pronounced in basic medium. This is ascribed to the dipolar nature of the compounds. Quaternary derivatives of the compounds show a further red shift in the absorption band in the visible region, which further corroborates their dipolar nature.
Determination of pH in Reversed Micelles
Authors: Fujii Hirotada , Kawai Tohru , Nishikawa Hiroyasu 
Published: July 2006

Abstract
A new method for the determination of pH in reversed micellar systems was proposed. The degree of dissociation (α) of Phenol Red in the systems was observed spectrophotometrically. The value of pH can be obtained by use of the Henderson-Hasselbach equation with the aid of pKa of Phenol Red measured by means of 31P-NMR in the systems containing phosphate buffer solutions. The method was applied to systems consisting of sodium octanoate, 1-hexanol, and water and some buffer solutions other than phosphate buffer solutions, and found to be effective within a wide pH range. Analysis of the fluorescence spectra of 8-anilino-1-naphthalene-sulfonic acid indicates that Phenol Red molecules are present at the interface between the water core and the 1-hexanol phase in reversed micelles. The hydrolytic reaction of p-nitrophenyl acetate was also studied kinetically and found to change slightly with pH.
Copper(I) Chloride Complex Containing p-Benzoquinone as a Ligand
Authors: Yamaguchi Hiroko , Kimura Hiroshi , Yasukouchi Kazuo 
Published: July 2006

Abstract
A new complex [(NH4)Cu3Cl4(C6H4O2)3⁄2·H2O] was synthesized from CuCl2, hydroquinone, and NH4Cl in an aqueous solution, and its structure was characterized on the bases of its UV, IR, and ESR spectra and TGA. On heating, this complex was stable up to 100 °C, but above 120 °C p-benzoquinone was released quantitatively. The complex was found to be a polynuclear copper(I) complex containing p-benzoquinone molecules and chlorides as ligands, and to be a charge-transfer complex in which π-electrons of the ring carbons of p-benzoquinone form coordinate bonds with Cu(I). The formation process of the complex was:
3CuCl2+3/2(C6H6O2)+H2O+NH4Cl=(NH4)Cu3Cl4(C6H4O2)3⁄2·H2O+3HCl
The Reaction between SO2 and MnO2 and the Role of the Sulfato Complex in the SO2-induced Isomerization of cis-2-Butene
Authors: Otsuka Kiyoshi , Tanaka Kimiaki , Morikawa Akira 
Published: July 2006

Abstract
The reaction between SO2 and MnO2 has been studied by measuring the consumption of SO2-gas and the infrared spectra of the wafer of MnO2. In the low-temperature range (&lt;200 °C) the reaction is completed within one or two surface layers of MnO2, and the reaction products are the bidentate sulfato complex (C2V) and the sulfato complex in Td symmetry. In the high-temperature range, on the other hand, the reaction progresses deep into the bulk and can be described by this stoichiometric equation; MnO2+SO2→MnSO4. The catalysis of MnO2 for the SO2-induced isomerization of cis-2-butene is closely related to the formation of the sulfate ion. The initiation step proposed for the isomerization is a polarization of the charge-transfer complex of SO2 and butene under the influence of the strong electrostatic field caused by the generation of the surface sulfato complex.
Adsorption of the Chromate Ion on Cured Diphenyl Phosphonate-Aldehyde Resins
Authors: Mori Hidehiko , Fujimura Yoshikazu , Takegami Yoshinobu 
Published: July 2006

Abstract
The adsorption of the chromate ion on cured diphenyl phosphonate-aldehyde resins has been investigated. Phosphorus-containing novolak type resins, obtained from the reaction of diphenyl phosphonate with aldehydes have been cured with additional hexamethylenetetramine. The adsorption of the chromate ion on the cured resins decreased in the order: propionaldehyde≈acrylaldehyde&gt;butyraldehyde&gt;crotonaldehyde&gt;acetaldehyde&gt;furfuial&gt; formaldehyde. The optimum pH for the adsorption of the chromate ion was in the range 3.0 to 4.0. In the case of the cured diphenyl phosphonate-propionaldehyde resin, the amount of the adsorption of the chromate ion was 20.5 mg Cr/g resin. Under the same conditions, the amounts of the adsorption of molybdate and tungstate ions were 40.5 mg Mo/g resin and 80.0 mg W/g resin, respectively. The adsorbed chromate ion was recovered at approximately 80 wt% as chromium by elution with 1.0 mol/1 aqueous HCl solution. The adsorbed molybdate and tungstate ions were desorbed with 2.0 and 3.0 mol/l aqueous H2SO4 solutions, respectively. The recovery rate for Mo and W was 100 wt%. The mechanism of adsorption of the chromate ion on the cured resins having phosphinylden groups, (Remark: Graphics omitted.)P(O)H, has been discussed.
ENDOR Spectrum of Some Dihydro-1,4-dithiin Cation Radical
Authors: Watanabe Kohji , Nagao Yoshimitsu , Fujita Eiichi , Ishizu Kazuhiko 
Published: July 2006

Abstract
The ENDOR spectrum of the 2,3-diphenyl-5,6-dihydro-1,4-dithiin cation radical, which was prepared with AlCl3 in dichloromethane solution, has been observed. The spin density distribution of the new radical was also discussed and compared with the MO calculation.
Substitution Reactions of (Acetonitrile)chlorobis(triphenylphosphine)rhodium(I) in Benzene
Authors: Ohtani Yoshimi , Yamagishi Akihiko , Fujimoto Masatoshi 
Published: July 2006

Abstract
The kinetics of the substitution reactions of RhCl(NCCH3)(PPh3)2 in benzene was studied at 20 °C by the stopped-flow method under anaerobic conditions. The following mechanism was proposed:
(Remark: Graphics omitted.)
Kinetics on the Formation and Decomposition of 2AlM2O3·B2O3 from Mixed Powders Prepared by the Alkoxy-method
Authors: Yamaguchi Osamu , Tada Minoru , Takeoka Kiyoshi , Shimizu Kiyoshi 
Published: July 2006

Abstract
The formation of the alkoxy-derived 2A12O3·B2O3 was observed in the temperature range 820–930 °C. Crystallization isotherms were best described by the contracting cube equation, the activation energy being determined as 368 kJ/mol. The kinetics on the decomposition of 2A12O3·B2O3 was also studied.
Determination of Alkyl Thioureas, Isothiocyanates and Amines with Iodine Monochloride
Authors: Verma Krishna K 
Published: July 2006

Abstract
Iodine monochloride oxidizes thioureas to respective urea and sulfate in hydrogencarbonate medium. The iodine formed in the reaction is titrated with iodine trichloride to an Andrews end-point. This method has been applied to determine isothiocyanates and amines by their conversion to thioureas.
The Reaction of 2,4,6-Heptanetrione with o-Phenylenediamine
Authors: Furuhashi Akiko , Aoki Koji , Sugimoto Morihito 
Published: July 2006

Abstract
2,4,6-Heptanetrione forms 2-acetyl-4-methyl-1,5-benzodiazepine with o-phenylenediamine in alkaline ethanol. In acidic ethanol, it would be expected that the 2-acetyl-4-methyl-1,5-benzodiazepinium cation would be formed. Contrary to expectations, however, the cation seems to be unstable. 2,4-Dimethyl-1,5-benzodiazepinium salt was obtained instead.
Asymmetric Reactions. IV. Asymmetric, Catalytic Activity of Poly(2-quinuclidinylmethyl acrylate)
Authors: Yamashita Tetsushi , Yasueda Hiroshi , Nakamura Nobuo 
Published: July 2006

Abstract
The asymmetric addition of methanol to phenylmethylketene has been conducted in the presence of poly(2-quinuclidinylmethyl acrylate) and 2-quinuclidinylmethyl propionate derived from (S)-2-quinuclidinylmethanol. The asymmetric functions of the above catalysts were similar to those of poly(O-acryloylquinine) and O-propionylquinine, which contain a quinoline ring and a vinyl group as additional groups to the quinuclidine ring.
Syntheses of 3,5-Dimethylspiro[5.5]undeca-2,4-diene-1,8-dione and 7,11-Dimethylspiro[5.5]undeca-7,10-diene-2,9-dione
Authors: Bhattagharya Kalyan Kumar , Sen Parimal Krishna 
Published: July 2006

Abstract
Syntheses of 1-diazo-5-(2-hydroxy-4,6-dimethylphenyl)-2-pentanone and 1-diazo-5-(4-hydroxy-2,6-dimethylphenyl)-2-pentanone and their acid catalysed spiroannulation to 3,5-dimethylspiro[5.5]undeca-2,4-diene-1,8-dione and 7,11-dimethylspiro[5.5]undeca-7,10-diene-2,9-dione respectively via Ar1-6 participation are described. Succinylation of 3,5-dimethylanisole is also discussed.
The Transport of Metal Ions against Their Concentration Gradients through a 1,2-Dichloroethane Membrane
Authors: Sugiura Masaaki , Shinbo Toshio 
Published: July 2006

Abstract
The uphill transport of metal ions such as copper, zinc, cobalt, and iron(II) ions through a bulk 1,2-dichloroethane membrane in the presence of various chelating agents has been studied. The membrane separated two aqueous phases, one containing the metal ion and potassium or lithium sulfate, and the other containing the metal ion and lithium nitrate or chloride. The chelating agents used were derivatives of 1,10-phenanthroline and acetylacetone. The accumulation of the metal ions in the aqueous phase containing the potassium or lithium sulfate was observed for only the following chelating agents: copper: 4,7-diphenyl-2,9-dimethyl- and 4,7-diphenyl-1,10-phenanthroline; zinc: 4,7-diphenyl-, 3,8-diphenyl-, 2,9-dimethyl-, and 4,7-diphenyl-2,9-dimethyl-1,10-phenanthroline; cobalt: 3,8-diphenyl- and 4,7-diphenyl-1,10-phenanthroline; and iron(II): 3,8-diphenyl-1,10-phenanthroline. In the system containing lithium sulfate in the aqueous phase, the rate of transport of the metal ions was slightly higher than that in the system containing potassium sulfate. The reduction of the nitrate ion in the aqueous phase brought about a lowering of the rate of transport of the metal ions. The transport of the metal ions was, however, unaffected by the electrostatic effect. The metal ion complexed by the chelating agent may be transferred in the 1,2-dichloroethane phase, thus forming an ion-pair with the nitrate or chloride ion.
Photo-oxidation Effect of Poly(N-vinylcarbazole) Film on Photoconductivity and Electronic Spectra
Authors: Itaya Akira , Okamoto Ken-ichi , Kusabayashi Shigekazu 
Published: July 2006

Abstract
The photo-oxidation effect on poly(N-vinylcarbazole) (PVCz) and amorphous 1,3-di(N-carbazolyl)propane films was studied by means of ultraviolet absorption, infrared absorption, and fluorescence spectra. The photoconductivity of the photo-oxidized PVCz films was also measured as a function of photoirradiation time. A photo-oxidation product which formed near the surface of films had a carbonyl substituent group, acted as a singlet exciton trap in competition with the excimer-forming sites, and formed an exciplex with an excited carbazolyl chromophore. The very slight amount of the photo-oxidation product enhanced the photoconductivity of PVCz films by a factor of ca.15, suggesting that the product acted as an electron-accepting impurity in the photo-carriergeneration mechanism in the lowest π-π* absorption region of PVCz films.
Solubility Isotherm of Reciprocal Salt-Pairs Containing Bis(ethylene-diamine)oxalatocobalt(III) (1R,3S,4S,7R)-3-Bromocamphor-9-sulfonate
Authors: Fuyuhiro Akira , Yamanari Kazuaki , Shimura Yoichi 
Published: July 2006

Abstract
Four-component solubility isotherm of reciprocal salt-pairs consisting of (Λ-[Co(ox)(en)2]+, Δ-[Co(ox)(en)2]+)–(Cl−, d-C10H14OBrSO3−)–H2O has been determined experimentally at 25 °C. It was found that a pseudoracemate, Λ-[Co(ox)(en)2]·Δ-[Co(ox)(en)2](d-C10H14OBrSO3)2·2H2O, is present as the only double salt, optical resolution of the bis(ethylenediamine)oxalatocobalt(III) ion in this system at 25 °C being impossible as in the case of the ternary system, Λ-[Co(ox)(en)2](d-C10H14OBrSO3)–Δ-[Co(ox)(en)2](d-C10H14OBrSO3)–H2O, at 25 °C.
The Thermochemical Behavior of Pentaamminedinitrogenruthenium(II) Complexes and the Kinetics of the Liberation of Ammonia from the Complex in the Solid State
Authors: Kohata Susumu , Itoh Noriko , Kawaguchi Hitoshi , Ohyoshi Akira 
Published: July 2006

Abstract
The thermochemical reactions of [Ru(NH3)5N2]X2 (X=Cl, Br, I) were investigated in the solid state. The ammonia ligand was liberated at a lower temperature (165–213 °C) than the nitrogen ligand (243–270 °C). The isothermal measurement reveals that the first step of the degradation of the complex can be expressed as: [Ru(NH3)5N2]X2(s)→[RuX(NH3)4N2]X(s)+NH3(g) (X=Cl, Br, or I). The rate of the reaction is first-order to [Ru(NH3)5N2]X2, and the first-order rate constant increased in the order of: chloride&lt;bromide&lt;lodide. The activation energies and the activation entropies (E/kJ mol−1 and ΔS\eweq/J K−1 mol−1 respectively) for the reaction were as follows: chloride (181±1,62±1), bromide (99±1, −95±2), and iodide (89±1, −102±3). The values of ΔS\eweq suggest that the salt with Cl− degrades through an SNl-like mechanism, while those with Br− and I− degrade through an SN2-type mechanism. The thermochemistry of [Ru(NH3)5N2]X2 has been discussed on the basis of the strong π-backbonding ability of the nitrogen ligand and the electronegativity of the outer-sphere ions.
Equilibria of Imidazole Derivatives with (Protoporphyrin IX dimethyl ester)iron(III) Chloride
Authors: Yoshimura Tetsuhiko , Ozaki Tomio 
Published: July 2006

Abstract
The equilibria of sterically hindered and unhindered imidazoles (B) with (protoporphyrin IX dimethyl ester)iron(III) chloride (Fe(PPDME)Cl) have been spectrophotometrically investigated in chloroform and 1,2-dichloroethane. The addition reaction of hindered imidazole with Fe(PPDME)Cl proceeds in two steps to give Fe(PPDME)B2Cl, with a formation constant, K1, greater than K2. The mono-adduct of hindered imidazoles exhibits an absorption band at around 590 nm, which shifts to longer wavelengths as the formation constant K1 decreases in this order; 2,4-dimethyl-&gt;2-methyl-&gt;2-ethyl-&gt;2-phenyl-&gt;1,2-dimethylimidazole. The addition reaction of an unhindered imidazole with Fe(PPDME)Cl proceeds in an apparent one step to give Fe(PPDME)B2Cl, with an overall formation constant of β2. The logβ2 linearly increases with the basicity, pKa(BH+), of unhindered imidazoles. The logβ2 for the system with NH-containing imidazoles is greater than that for the system with N-substituted imidazoles by about 3.1 log units, on the average, based on the stabilization of the positive charge on iron(III) through NH…Cl hydrogen bonding. The solvent effect on the formation constants is also discussed.
Curve Fitting Methods Applied to the Elucidation of Asymmetric Gas-Liquid Chromatographic Peaks
Authors: Takeuchi Koji , Kambara Tomihito 
Published: July 2006

Abstract
It was shown that the shape of gas-liquid chromatographic peak is expressed by the Gaussian distribution multiplied by a higher order algebraic equation of time. Application of the curve fitting methods, i.e., the Newton’s divided-difference formula and the orthogonal polynomials method, could well clear up the experimentally observed gas-liquid chromatograms of trailing and leading types, respectively. The asymmetric shapes of gas-liquid chromatographic peaks are attributed to the slowness of vaporization or dissolution in the partition process.
Thermodynamics of 1:1 Adduct-formation of Bis(trifluoroacetyl-acetonato)copper(II) with Lewis Bases
Authors: Sasaki Yoshihiro , Sakurada Matsujiro , Matsui Masakazu , Shigematsu Tsunenobu 
Published: July 2006

Abstract
Formation constants and thermodynamic parameters for the 1: 1 adduct-formation reactions of bis(trifluoroacetylacetonato)copper(II), Cu(tfac)2, with alkylamines, α-picoline, 2,6-lutidine, and THF have been determined spectrophotometrically. The ΔH°–ΔS° plots for primary and secondary alkylamines gave a linear relationship for the thermodynamic parameters of the Cu(tfac)2-heterocyclic base systems. The plots for the 2,6-lutidine, THF and tertiary alkylamine systems have been found consistent with a correlation between ΔH° and ΔS° values for bis(acetylacetonato)copper(II)–heterocyclic base systems. It has been subsequently deduced that the 1: 1 adducts of Cu(tfac)2 with Lewis bases possess a square-pyramidal structure on the basis of the ESR data for the 63Cu(tfac)2–Lewis base systems.
A Possible Method for Obtaining Precise Isotope Ratio of the Element Having Only Two Isotopes
Authors: Kanno Hitoshi 
Published: July 2006

Abstract
As an extension of the atomic/molecular vaporization model, a new method is presented for correcting the isotopic fractionation effects in the multiple filament thermal ionization source (MFTIS). It is applicable to the isotope ratio measurements of the element having only two observable isotopes.
Spectrophotometric Determination of Cobalt(II) with Eriochrome Black T after Extraction as Methyltrioctylammonium Tetrathiocyanatocobaltate(II)
Authors: Rokugawa Yuh’ichi , Sugawara Masao , Kambara Tomihito 
Published: July 2006

Abstract
A sensitive extraction-spectrophotometrie method for determination of cobalt(II) with Eriochrome Black T is described, which involves the preliminary separation of cobalt from aqueous solution by the benzene extraction of methyltrioctylammonium tetrathiocyanatocobaltate(II). The quantitative formation of ion pair between cobalt–Eriochrome Black T complex anion and the quaternary ammonium cation is attained by shaking the resulting extract with aqueous Eriochrome Black T solution of pH 5.5–8.2. Beer’s law holds for 0.57–4.0 μg cobalt in 5 ml of the extract with the molar absorption coefficient of ε587=6.62×104 cm−1 mol−1l (Sandell sensitivity 8.90×10−4 μg cm−2). The composition of the extracted ion pair is estimated to be cobalt: Eriochrome Black T:methlytrioctylammonium ion=1:2:3.
The Electrochemical Oxidation of Aminopurines and Their Hydroxy Derivatives at the Glassy Carbon Electrode
Authors: Yao Toshio , Musha Soichiro 
Published: July 2006

Abstract
The electrochemical oxidation of aminopurines and their hydroxy derivatives, which gave a single voltammetric peak at the glassy carbon electrode, was investigated by means of linear-sweep voltammetry, cyclic voltammetry, coulometry, and macroscale control!ed-potential electrolysis. In general, the ease of oxidation of these compounds increased in proportion to the number of hydroxyl or amino groups on the molecule. The coulometric n-values for monosubstituted purines were 5.86–6.08, for disubstituted purines they were 3.90–4.20, and for trisubstituted purines they were 2.07–2.33. The electrochemical oxidation of the different aminopurines appeared to follow initially the same path as the enzymatic oxidation; i.e., the primary attack for the electrochemical oxidation occurred first at the C-8 position, and then the C-2 position. Thus, aminopurines were oxidized in two sequential two-electron processes to give first 8-hydroxy and then 2,8-dihydroxy(or 6,8-dihydroxy) intermediates. Then, this latter intermediate was further oxidized in a two-electron process to produce a diimine intermediate, which was unstable and which then broke down to the ultimate products, such as parabanic acid, oxaluric acid, urea, ammonia, allantoin, and guanidine.
Crystal and Molecular Structure of Mitomycin C, an Anticancer Antibiotic
Authors: Ogawa Keizo , Nomura Akiko , Fujiwara Takaji , Tomita Ken-ichi 
Published: July 2006

Abstract
The crystal structure of mitomycin C was determined by means of X-ray diffraction. Mitomycin C was crystallized in the orthorhombic space group P212121, with a=12.887, b=13.851, c=9.718 Å, and Z=4, and its structure solved by the trial and error method using the rigid-body approximation. The absolute configuration was determined by referring to that of N-(p-bromobenzoyl) mitomycin C. The carbamoyloxymethyl side chain participates in hydrogen bonds as in the case of other mitomycins in the crystalline state.
Relative Spin-trapping Ability of N-Benzylidene-t-butylamine Oxide, N-Benzylideneaniline Oxide, and 2,3,5,6-Tetramethylnitrosobenzene towards Phenyl and Phenylcyclohexadienyl Radicals
Authors: Kamimori Mariko , Sakuragi Hirochika , Sawatari Katsuhiko , Suehiro Tadashi , Tokumaru Katsumi , Yoshida Masayuki 
Published: July 2006

Abstract
N-Benzylidene-t-butylamine oxide (PBN), N-benzylideneaniline oxide (DPN), and 2,3,5,6-tetraraethylnitrosobenzene (ND) trap phenyl radicals in a relative rate of 1 : 0.72 : 2.6, whereas they trap phenylcyclohexadienyl radicals in a relative rate of 1 : 2.3 : 130. The origin of such different spin-trapping abilities of these spin traps towards phenylcyclohexadienyl radicals is discussed.