bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of Ion Transport across Amphoteric Ion-Exchange Membrane. VI. Multi-Ionic Potential, Membrane Permeability, and Ion-Sieve Effect
Authors: Kaibara Kozue , Kumagai-Ueda Kyoko , Inoue Hiroyoshi 
Published: August 2006

Abstract
The transport characteristics of an amphoteric ion-exchange membrane were examined by electrochemical measurements for a multi-ionic system, in which NH4Cl and tetraalkylammonium chloride (TAA·Cl) solution phases are divided by the membrane phase. Membrane permeability values were estimated for two cations, NH4+ and TAA+, and Cl−, as well as for whole cations as an averaged quantity describing the cation transport process relative to the anion transport process. The present study indicated that ion-sieve permeation characteristics, which have been demonstrated as a fundamental transport mechanism across an amphoteric ion-exchange membrane in the concentration-cell systems, still play a dominant role in the multi-ionic system. Satisfactory linear relationships of the logarithmic membrane permeabilities to NH4+, Cl−, and a series of TAA+ ions against the hydrated ionic radii of respective ions were obtained. This linear relation was not affected appreciably by the combination of electrolytes separated by the membrane. Thermodynamic analyses on the multi-ionic transport across an amphoteric ion-exchange membrane contribute to improve the selective performances of membrane materials and to survey more efficient operating conditions of the membrane processes.
Indirect Determination of Iodide Using Flame Atomic Absorption Spectrometry
Authors: Nag Jiban Kumar , Chattaraj Sarnath , Das Arabinda K 
Published: August 2006

Abstract
An indirect atomic absorption spectrometric determination of iodide has been proposed. The method involves the formation of chelate complex, [Cu(bptc)I], where BPTC, Hbptc = 2-benzoyl pyridine thiosemicarbazone, within a wide pH range (4.3—8.5), extraction of the complex into butyl acetate solvent and determination of copper signal by flame AAS and hence indirectly determining iodide. The method gave a linear graph upto 10. 4 μg ml−1 of iodide with a limit of detection (3σ) value of 47 ng ml−1. The proposed method was free of spectral interferences from large number of metal ions, anions, and organics. Hence it was successfully applied to iodide determination in laboratory chemicals and commercial grade salts.
Electrochemical Reactions of Dihalobis(isocyanide)nickel(II) at Platinum and Mercury Electrodes
Authors: Yamamoto Yasuhiro , Ehara Kazuko , Takahashi Katsuo 
Published: August 2006

Abstract
Electrochemical reactions of divalent nickel complexes, NiX2(RNC)2 (1) (X = I, Br, Cl; R = 2,6-Me2C6H3 (Xyl), 4-Br-2,6-Me2C6H2, 2,4-t-Bu2-6-MeC6H2, 2,4,6-t-Bu3C6H2) were carried out at Hg and Pt electrodes. Cyclic voltammograms (CVs) of 1 at a Pt electrode showed a quasi-reversible redox wave at ca. −0.50 V, due to two-electron reduction [(1) (1)2−]. The reduction potential of the iodide (1a) or bromide (1f) complex (R = Xyl) shifted to the positive side by ca. 0.3 V in the presence of isocyanide, due to the electrochemical reaction of NiX2(RNC)3 (X = I, Br). The chloride complex (1e) showed a similar potential in the presence or absence of isocyanide; there exists no five-coordinated complex. The CV of 1a at a Hg electrode showed a redox wave at −0.74 V, due to the redox reaction of the unsaturated species, “[Ni(RNC)2HgI2]” (4) formed from the reaction of 1a with Hg, suggesting the CE mechanism. Compound 1a had a redox potential at −0.72 V in the presence of 2,6-xylyl isocyanide, being responsible for [Ni(RNC)4HgI2]2. The bromide complex showed a similar behavior, but the chloride complex underwent a very complicated reaction. The electrochemical mechanism of NiX2(RNC)2 with or without isocyanide is discussed.
Studies on Mixed Chelates. XX. Mono- and Binuclear Nickel(II) and Copper(II) Complexes with N,N,N′,N″,N″′,N″′-Hexamethyltriethylenetetramine and β-Diketonates
Authors: Shintani Noriko , Kotaki Junko , Sone Kozo , Fukuda Yutaka 
Published: August 2006

Abstract
Nine mixed chelates of Ni(II) and Cu(II) with N,N,N′,N″,N″′,N″′-hexamethyltriethylenetetramine (hmtt) and β-diketonate (dike) ligands were prepared and characterized. Except for [Ni(dipm)(hmtt)]ClO4 (dipm = dipivaloylmethanate), all of them were found to be binuclear chelates: (i) [M2(dike)4(hmtt)] (M = Ni, dike = dipm,acac(acetylacetonate), tfac, or hfac(tri- or hexafluoroacetylacetonate); M = Cu, dike = hfac), (ii) [Ni2(NO3)2(dike)2(hmtt)] (dike = dipm, acac), and (iii) [Cu2(acac)2(hmtt)](ClO4)2. Although they are similar to their mononuclear analogues containing N,N,N′,N′-tetramethylethylenediamine (tmen), a number of characteristic differences exist. Though the Ni(II) chelates are only slightly solvatochromic, the Cu(II) chelates are strongly so.
Preparation and Properties of Vanadium (III) Complexes with l-Cysteinate and d-Penicillaminate
Authors: Maeda Haruyo , Kanamori Kan , Michibata Hitoshi , Konno Takumi , Okamoto Ken-ichi , Hidaka Jinsai 
Published: August 2006

Abstract
The coordination geometry of bis(l-cysteinato) vanadate(III) was determined by single-crystal X-ray crystallography. The vanadium(III) center coordinates octahedrally two tridentate l-cysteinate ligands via trans S, cis O, and cis N atoms. Bis(d-penicillaminato) vanadate(III) was characterized so as to adopt a similar trans(S) configuration based on its electronic spectrum. The coordination chemistry of the two complexes in solution was examined on the basis of the ligand-to-metal charge-transfer band. One of the two V(III)–S bonds of each complex is easily cleaved in solution.
Synthesis and Properties of 3-, 4-, and 5-Nitro-2-pyridinecarbaldehyde 2-pyridylhydrazones and Characterization of Their Metal Complexes
Authors: Odashima Tsugikatsu , Sakakura Kei , Kohata Katsunori , Ishii Hajime 
Published: August 2006

Abstract
Three hydrazones, 3-, 4-, and 5-nitro-2-pyridinecarbaldehyde 2-pyridylhydrazones, were synthesized. Their properties and reactivities with metal ions and the extraction and characteristics of the resultant complexes have been investigated and compared with one another. As a result, useful information on the molecular design of highly sensitive hydrazone reagents has been obtained.
Synthetic Utility of Amine–Cyanoborane Complexes as Reducing Agents
Authors: Das Mrinal Kanti , Maiti Pradip Kumar , Bhaumik Arpita 
Published: August 2006

Abstract
Investigations with amine–cyanoborane complexes as new viable reducing agents have shown that the reactivity of amine–cyanoborane complexes is highly dependent on the nature of the component amine and on the solvent used, and that the amine–cyanoborane complexes derived from primary amines are highly efficient and chemoselective reducing agents compared to those derived from secondary and tertiary amines.
Generation of β-Carbonyl Radicals from Cyclopropanol Derivatives by the Oxidation with Manganese(III) 2-Pyridinecarboxylate and Their Reactions with Electron-Rich and -Deficient Olefins
Authors: Iwasawa Nobuharu , Hayakawa Satoshi , Funahashi Masahiro , Isobe Koichi , Narasaka Koichi 
Published: August 2006

Abstract
Various β-carbonyl radicals are generated oxidatively from cyclopropanol derivatives by the use of manganese(III) 2-pyridinecarboxylate (Mn(pic)3). These β-carbonyl radicals react with electron-rich olefins such as conjugated silyl enol ethers, a ketene thioacetal, a ketene dithioacetal, and a vinyl ether intermolecularly to give crossed-addition products in good yield. Furthermore, the combined use of Mn(pic)3 and tributylhydridotin makes it possible to carry out the 1 : 1 addition reaction of these β-carbonyl radicals with electron-deficient olefins such as acrylonitrile, acrylaldehyde, methyl acrylate, methyl vinyl ketone, and N,N-dimethylacrylamide, and the corresponding products are obtained in moderate to good yield.
Synthesis and Inclusion Properties of Carbonyl-Bridged Analogs of Acyclic p-t-Butylphenol–Formaldehyde Oligomers
Authors: Ohba Yoshihiro , Irie Keisaku , Zhang Fu Sheng , Sone Tyo 
Published: August 2006

Abstract
A series of compounds in which a part or all of the methylene bridges of acyclic p-t-butylphenol–formaldehyde oligomers are replaced by C=O bridge(s) has been synthesized. The carbonyl-bridged tetramers, except for that with no methylene bridge, formed crystalline host–guest complexes with various organic compounds; those with two C=O bridges were superior regarding complexation, regardless of the position of the bridges. Exclusive guest selectivity of the tetramer with one terminal C=O bridge was observed for benzene and its methyl derivatives in a two-component system. The fully carbonyl-bridged dimer, trimer, tetramer, and pentamer had no complexing-capability. The thermal stability of benzene complexes (host : guest = 2 : 1) of the tetramers with one C=O bridge, as estimated from their thermal dissociation rates, are remarkably lower than that of the parent tetramer. Oximes derived from the tetramers with one C=O bridge were much more effective than the corresponding carbonyl-bridged ones regarding their complex-forming capability.
Spectrophotometric and Calorimetric Studies on Nickel(II) Chloro Complexes in Acetonitrile
Authors: Suzuki Honoh , Ishiguro Shin-ichi 
Published: August 2006

Abstract
Complexation equilibria between nickel(II) and chloride ions have been studied in acetonitrile (MeCN) by spectrophotometry and calorimetry at 25 °C. Formation of four mononuclear complexes, [NiIICln](2−n)+ (n = 1—4), has been found, and their formation constants, enthalpies and entropies have been determined. Individual electronic spectra of the complexes are obtained for both charge-transfer (CT) bands (230—350 nm) and d-d transition bands (320—840 nm). These spectra indicate coordination geometries of octahedral complexes {[Ni(MeCN)6]2+, [NiCl(MeCN)5]+, [NiCl2(MeCN)4]} and tetrahedral ones {[NiCl3(MeCN)]−, [NiCl4]2−}. The tetrachloronickelate (II) complex is less stable and the overall formation is more endothermic than the analogous copper(II) and zinc(II) complexes. For these metal systems, the overall complexation reactions are more favored and more exothermic in MeCN than in N,N-dimethylformamide (DMF), which is ascribed to the much weaker solvation toward hard metal ions in MeCN.
Footprint Catalysis. V. Substituent Effects of Template Molecules on the Catalytic Behavior of Imprinted Molecular Footprint Cavities
Authors: Shimada Toyoshi , Kurazono Ritsuko , Morihara Kensaku 
Published: August 2006

Abstract
“Footprint catalysts” are silica(alumina) gel catalysts with tailored substrate specificities; they are easily prepared by the present authors' molecular imprinting procedures with an appropriate template. Four footprint catalysts were newly prepared by imprinting using p-acetamido-substituted derivatives of benzenesulfonamide and benzamide as templates. They catalyzed transacylations of benzoic anhydride and 4-(acetamido)benzoic benzoic anhydride, respectively. The effects of the acetamido substituents apart from the reaction center on the substrate specificities were investigated.
N-Hydroxyamide-Containing Heterocycles. Part 2. Synthesis and Iron(III) Complex-Forming Tendency of 1-Hydroxy-2(1H)-pyrimidinone and -pyrazinone
Authors: Ohkanda Junko , Tokumitsu Takeshi , Mitsuhashi Keiryo , Katoh Akira 
Published: August 2006

Abstract
The reaction of N-(benzyloxy)urea with 1,1,3,3-tetraethoxypropane, 4,4-dimethoxy-2-butanone, and 2,4-pentanedione under acidic conditions gave the corresponding 1-benzyloxy-2(1H)-pyrimidinones (3 and 3′) in moderate yields. In contrast, the reaction of N-(benzyloxy)urea or N-methoxyurea with 1-phenyl-1,3-butanedione exclusively gave 3-alkoxyimino derivatives (4). 1-Benzyloxy-2(1H)-pyrazinones (9a and 9b) were synthesized via three steps starting from N-(t-butoxycarbonyl)glycine. The hydrogenation or treatment with 30% HBr in acetic acid of compounds 3c, 9a, and 9b afforded 1-hydroxy-4,6-dimethyl-2(1H)-pyrimidinone (HOPY), and 1-hydroxy- (HOPR-H), and 1-hydroxy-5,6-dimethyl-2(1H)-pyrazinone (HOPR-Me), respectively. They form 3 : 1 complexes of iron(III) with the N-hydroxyamide groups in the acidic region, but the stability constants of their iron(III) complexes are far below that of natural ferrioxamine B.
A Highly Regioselective Reaction of Allylic Acetates with Silylated Carbon Nucleophiles Directed by a Sulfenyl Group. Scope, Limitation, and Mechanistic Aspects
Authors: Kudo Kazuaki , Hashimoto Yukihiko , Houchigai Hitoshi , Hasegawa Masaki , Saigo Kazuhiko 
Published: August 2006

Abstract
α-(Sulfenylmethyl)allyl acetates reacted with silylated carbon nucleophiles in the presence of a catalytic amount of TMSOTf to give products substituted at the α-position of the sulfenylmethyl group in moderate to good yields with high regioselectivity. The theoretical calculation on an intermediate cationic species indicated that an episulfonium ion was a stable form; the observed regioselectivity was rationalized qualitatively on the basis of the coefficients of LUMO of the cation. Some transformations of the products were also demonstrated.
Electron-Transfer Photosensitized Oxygenation of Stilbene and Naphthalene Derivatives in the Presence of Acetate Ion. Controlling the Reaction of the Cation Radicals by Weak-Nucleophilic Salts
Authors: Yamashita Toshiaki , Tsurusako Taiji , Nakamura Nobuya , Yasuda Masahide , Shima Kensuke 
Published: August 2006

Abstract
The 9,10-Dicyanoanthracene (DCA)- or 9-cyanoanthracene-sensitized photooxygenation of trans-stilbene derivatives gave benzaldehyde derivatives efficiently in the presence of weak-nucleophilic salts, such as Et4NOAc and KOAc/18-crown-6 ether. The product distribution of this photooxygenation was apparently different from that of each photooxygenation in the presence of Mg(ClO4)2 and Et4NBF4 or in the absence of the salt. The DCA-sensitized photooxygenation of 2-methylnaphthalene gave phthalic acid and 4-methylphthalic acid in the presence of Et4NOAc. These products were different from the products generated from each photooxygenation in the presence of Et4NBF4 and KClO4 or in the absence of the salt. Also, such ring-oxygenation occurred in the DCA-sensitized photooxygenation of 2,3-dimethylnaphthalene and naphthalene in the presence of Et4NOAc. These photooxygenations in the presence of Et4NOAc proceeded by the addition of an acetate ion to the cation radical of the substrate generated by a photochemical electron transfer from the substrate to the sensitizer and the subsequent reaction with O2 and the related oxygen species.
Structures of New Pseudo-Peptide Antibiotics, Sperabillins
Authors: Hida Tsuneaki , Tsubotani Shigetoshi , Funabashi Yasunori , Ono Hideo , Harada Setsuo 
Published: August 2006

Abstract
Sperabillins, novel antibiotics, were isolated from the culture filtrate of Pseudomonas fluorescens YK-437. The structure of sperabillin A was elucidated to be 3-[[(3R,5R)-3-amino-6-[(2E,4Z)-2,4-hexadienoylamino]-5-hydroxyhexanoyl]amino]propanamidine dihydrochloride. Sperabillin B has a methyl substituent at the C-6 position of sperabillin A. Sperabillin C and D are (2E,4E)-isomers of the 2,4-hexadienoyl moiety of sperabillin A and B, respectively.
Synthetic Photochemistry. LX. One-pot Formation of Spirocyclic 3-Acetyl-2-hydroxy-2-cyclopentenone Derivatives from Methylenecycloalkanes and Methyl 2,4-Dioxopentanoate
Authors: Hatsui Toshihide , Ikeda Shin-ya , Takeshita Hitoshi 
Published: August 2006

Abstract
A series of proto-photocycloadducts of methyl 2,4-dioxopentanoate to methylenecycloalkanes and -alkenes spontaneously caused retro-benzilic acid rearrangement in high yields. The results are utterly different from those of sterically-crowded acyclic alkenes, with which the rearrangement occurred by thermolysis as a minor process.
Studies of the Selective O-Alkylation and Dealkylation of Flavonoids. XIV. A Convenient Method for Synthesizing 5,6,7-Trihydroxy-3-methoxyflavones from 6-Hydroxy-3,5,7-trimethoxyflavones
Authors: Horie Tokunaru , Tominaga Hideaki , Yoshida Isao , Kawamura Yasuhiko 
Published: August 2006

Abstract
Demethylation of 6-hydroxy-3,5,7-trimethoxyflavones and their acetates was studied and the following results were found. Demethylation of 6-hydroxy-3,4′,5,7-tetramethoxyflavone with 30% anhydrous aluminum chloride in acetonitrile afforded a mixture of 5,6-dihydroxy-3,4′,7-trimethoxyflavone and 5,6,7-trihydroxy-3,4′-dimethoxyflavone, but demethylation of its acetate formed the 5,6,7-trihydroxyflavone as a main product. The latter reaction was applicable as a general method for synthesizing 5,6,7-trihydroxy-3-methoxyflavones. On the other hand, the demethylation of 6-hydroxy-3,4′,5,7-tetramethoxyflavone with 10% anhydrous aluminum bromide in acetonitrile afforded the 5,6,7-trihydroxyflavone as a main product without cleavage of the 4′-methoxyl group and the reaction was more conveniently applicable for the synthesis of the 5,6,7-trihydroxyflavones. The method, however, was not adapted to the synthesis of the flavones with methoxyl groups adjacent to the hydroxyl group on the B ring, since the benzyloxyl group and the methoxyl group adjacent to the hydroxyl group were simultaneously cleaved under demethylating conditions. Seven 5,6,7-trihydroxy-3-methoxyflavones were synthesized by these methods and their properties were clarified.
Trityl Antimonate-Catalyzed Sequential Reactions of Epoxides with Silylated Nucleophiles. Rearrangement of Epoxides and C–C or C–O Bond Forming Nucleophilic Reaction onto the Intermediate Carbonyl Compounds
Authors: Harada Tsunehiro , Mukaiyama Teruaki 
Published: August 2006

Abstract
In the presence of a catalytic amount of trityl hexafluoroantimonate, sequential reactions of epoxides with silylated nucleophiles, rearrangement of epoxides and C–C or C–O bond forming nucleophilic reaction onto the intermediate carbonyl compounds, proceed smoothly to afford the corresponding products in fairly good yields by one-pot procedure. Trityl hexafluoroantimonate (5 mol %) efficiently promotes the above plural sequential reactions.
Preparation and Characterization of Tow kinds of cis-[RuCl(qn)2NO] (Hqn = 4-Methyl-, 2,4-dimetyl-, 2-ethly-, or 5-chloro-8-quinolinol), and the Photoinduced Preparation of the trans-[RuCl(qn)2NO] from the cis-Complex
Authors: Ikezawa Hidenori , Miki Eiichi , Mizumachi Kunihiko , Ishimori Tatujiro , Nagai Takashi , Tanaka Mikio 
Published: August 2006

Abstract
A mixture of hydrous trichloronitrosylruthenium(III) and 8-qulinolinol derivative (4-methyl-, 2,4-dimethyl-, 2-ethyl-, or 5-chloro-8-quinolinol) (mole ratio 1 : 4—5) was refluxed in ethyl alcohol in the dark to prepare two kinds of cis-type complexes, [RuCl(qn)2NO] (Hqn = 8–quinolinol derivative), cis-1 and cis-2, as major products. Using 2,4-dimethyl- or 2-ethyl-8-quinolinol, the trans complex was prepared in low yield with the cis-type complexes. The trans complex could be photochemically generated from the cis-1 complex in dichloromethane in good yield. The introduction of an alkyl group with an electrondonating nature to the 2-position in the quinolinol ring could induce the formation of the trans complex. The complexes were characterized by NMR, IR UV-vis, and field desorption mass spectrometries. From the cis-1-trans photoisomerization reaction in the presence of 15NO (15N atom % = 99), a bond rupture between Ru and NO was found to be involved in the reaction.
A Versatile Synthetic Method of 1-Alkylazulenes and Azulene by the Reactions of 3-Methoxycarbonyl-2H-cyclohepta[b]furan-2-one with in situ Generated Enamines
Authors: Yasunami Masafumi , Miyoshi Shiro , Kanegae Noriko , Takase Kahei 
Published: August 2006

Abstract
Methyl 3-alkylazulene-1-carboxylates were synthesized in high yields by the reaction of 3-methoxycarbonyl-2H-cyclohepta[b]furan-2-one with in situ generated morpholine enamines of aldehydes. Treatment of the esters with 100% phosphoric acid gave 1-alkylazulenes in excellent yields. Azulene was also synthesized in a good yield via methyl azulene-1-carboxylate with a modification of this method.
Optical Resolution and Absolute Configuration of anti Head-to-Head Umbelliferone Dimer
Authors: Adegawa Yutaka , Hashimoto Yukihiko , Fang Lan , Nakamura Masataka , Kinbara Kazushi , Hasegawa Masaki , Saigo Kazuhiko 
Published: August 2006

Abstract
(±)-anti Head-to-head umbelliferone dimer was resolved into a pair of optically active forms in good yields with high optical purity by a diastereomeric separation of two diastereomeric diamides obtained by the ring-opening addition reaction with optically pure erythro-2-amino-1,2-diphenylethanol or norephedrine, followed by hydrolysis and relactonization. The absolute configuration of the cyclobutane in (−)589-anti head-to-head umbelliferone dimer was confirmed to be (S,S,S,S) by an X-ray crystallographic analysis of the diamide derived from the (−)589-form by the ring-opening addition reaction with (S)-(−)589-1-(1-naphthyl)ethylamine. The absolute configuration of the cyclobutane in (−)589-anti head-to-head umbelliferone dimer is in agreement with that in (−)589-anti heat-to-head coumarin dimer.
Footprint Catalysis. VI. Chiral “Molecular Footprint” Catalytic Cavities Imprinted by a Chiral Template, Bis(N-benzyloxycarbonyl-l-alanyl)amine, and Their Stereoselective Catalyses
Authors: Morihara Kensaku , Kawasaki Satoko , Kofuji Miki , Shimada Toyoshi 
Published: August 2006

Abstract
Chiral “molecular footprint” catalytic cavities were formed on a silica(alumina) gel surface by molecular imprinting with a chiral template, bis(N-benzyloxycarbonyl-l-alanyl)amine. These cavities exhibited stereoselective catalyses in the transacylation of the corresponding substrates: l-, d-, and meso- forms of bis(benzyloxycarbonyl-alanyl) oxide.
Synthesis of 1-Substituted 1,2-Bis(trimethylsilyl)ethenes via Hydroboration of 1,2-Bis(trimethylsilyl)ethyne with Dialkylborane
Authors: Hoshi Masayuki , Masuda Yuzuru , Arase Akira 
Published: August 2006

Abstract
The reaction of 1,2-bis(trimethylsilyl)ethyne with a stoichiometric amount of dialkylborane proceeds to the monohydroboration stage, giving [(Z)-1,2-bis(trimethylsilyl)ethenyl]dialkylborane. In situ treatment of the above alkenylborane with iodine in the presence of aqueous sodium hydroxide provides highly pure (E)-1-alkyl-1,2-bis(trimethylsilyl)ethene whose alkyl group migrates from the boron atom. Successive treatment of [(Z)-1,2-bis(trimethylsilyl)ethenyl]dicyclohexylborane with copper(I) iodide, allyl bromide, and aqueous sodium hydroxide affords a cross-coupling product, (Z)-1,2-bis(trimethylsilyl)-1,4-pentadiene, stereoselectively. A similar cross-coupling reaction with 1-bromo-1-hexyne followed by UV irradiation affords (E)-1,2-bis(trimethylsilyl)-1-octen-3-yne stereoselectively.
Magnetic Field Effects on and Mechanism of Photoredox Reaction of Aromatic Nitro Group
Authors: Mutai Kiyoshi , Nakagaki Ryoichi , Tukada Hideyuki 
Published: August 2006

Abstract
Photoredox reaction mechanism of a homologous series p-O2NC6H4O(CH2)nNHPh (1) in acetonitrile and benzene is studied. The major products are p-ONC6H4O(CH2)n−1CHO (3) and aniline derived from intramolecular reaction, but the presence of minor amounts of intermolecular reaction products, p-O2NC6H4O(CH2)n−1CHO (4) and p-ONC6H4O(CH2)nNHPh (5) is confirmed in the reaction mixture. In the presence of an external magnetic field, the yield of 3 is suppressed and those of 4 and 5 are correspondingly increased, while the rates of the disappearance of 1 and of the formation of aniline remain unchanged, suggesting the presencer of biradical recombination process accompanied by intersystem crossing in a rate-determining step. On the basis of these observations, two reaction schemes are proposed. The magnetic field effects provide strong evidence for the presence of a transient species with (nitro)N(OH)–O–CHN&lt; group generally supposed for nitro oxygen transfer process in this type photoreaction.