bluuebunny/crossref_metadata_2025_split huggingface dataset:
SYNTHESES OF [3.3]CYCLOPHANES
Authors: Otsubo Tetsuo , Kitasawa Masashi , Misumi Soichi 
Published: July 2006

Abstract
Two synthetic methods of [3.3]cyclophanes via dithia[4.4]cyclophanes are presented. Direct photodesulfurization method is generally successful except in the cases of metapara- and meta-cyclophanes which are prepared by pyrolytic method of bissulfone.
THE PHOTOCHEMICAL BEHAVIOR OF DI-μ-OXO-BINUCLEAR MANGANESE COMPLEXES IN ACIDIC SOLUTION
Authors: Otsuji Yoshio , Sawada Keizo , Morishita Isao , Taniguchi Yukio , Mizuno Kazuhiko 
Published: July 2006

Abstract
Di-μ-oxo-dimanganese complex [Mn2IV,IIIO2(bpy)4](Clo4)3, which is stable in the ground state, is reduced by irradiation of 313 nm light in acidic solutions. On the other hand, [Mn2IV,IVO2(phen)4](Clo4)4 is reduced in the dark to the MnIV–MnIII complex and then further reduced upon irradiation. The photoreductions of the complexes are accompanied by the one-electron oxidation of water to generate hydroxyl radical.
PHOTOREDUCTION OF 2-PIPERIDINOANTHRAQUINONE BY AN ELECTRON TRANSFER VIA THE UPPER EXCITED nπ* TRIPLET STATE
Authors: Inoue Haruo , Kawabe Kiyoshi , Kitamura Noboru , Hida Mitsuhiko 
Published: July 2006

Abstract
The photoreduction of 2-piperidinoanthraquinone (1) by an electron transfer from hydroxide ion in 4:1 2-propanol-water mixture was reinvestigated. The reaction proceeded on irradiation with the light of λ = 365 nm, but hardly did with that of λ&gt;420 nm which excites (1) exclusively to the 1CT level. The fluorescence of (1) was not affected by hydroxide ion. 1,3-Cyclohexadiene as a triplet quencher retarded the photoreduction. The reactive state of (1) in the photoreduction was concluded to be not the intramolecular excited CT state, but the upper excited nπ* triplet state.
REACTIONS OF ISOCYANIDE-PALLADIUM(II) COMPLEXES WITH NITRILIMINES. NOVEL CYCLIC CARBENE-PALLADIUM(II) COMPLEXES
Authors: Hiraki Katsuma , Fuchita Yoshio , Morinaga Shigeki 
Published: July 2006

Abstract
cis-[PdCl2(PPh2R)(CN–C6H4–CH3–p)] (R=Ph or Et) reacted with nitrilimines, derived from N-phenylarylcarbohydrazonyl chlorides and triethylamine, to afford novel cyclic carbene-palladium(II) complexes, cis-[PdCl2(PPh2R){CN(C6H4–CH3–p)C(C6H4–R′−p)=N-NPh}].
PROPERTIES OF BENZANNELATED TRISDEHYDRO[10.10.2][14]ANNULENO[14]ANNULENES
Authors: Sakano Koichi , Akiyama Shuzo , Iyoda Masahiko , Nakagawa Masazumi 
Published: July 2006

Abstract
Increase of diatropicity of the dibenzotrisdehydro[14]annuleno[14]annulene as compared with that of benzotrisdehydro[14]annuleno[14]annulene, which is expected if the dibenzannulenoannulene is a peripheral conjugated system could not be observed. The observed NMR behavior seems to indicate that the dibenzo derivative is a fused system consisting of two 14π-electron systems.
EFFECT OF ALKYL SUBSTITUENTS ON CYCLOBUTYL-CYCLOPROPYLCARBINYL TYPE REARRANGEMENT OF 2-OXABICYCLO[4.2.0]OCTAN-3-ONES
Authors: Tobe Yoshito , Kakiuchi Kiyomi , Kawakami Yukio , Sakai Yasuo , Kimura Koji , Odaira Yoshinobu 
Published: July 2006

Abstract
Cyclobutyl-cyclopropylcarbinyl type rearrangement of 2-oxabicyclo[4.2.0]octan-3-ones and remarkable effect of alkyl substituents at the bridgehead positions on this rearrangement are described.
ACTIVE FIXED Mo CATALYSTS FOR OLEFIN METATHESIS AND CHEMICAL STATE OF THE ACTIVE SITE
Authors: Iwasawa Yasuhiro , Ogasawara Sadao , Soma Mitsuyuki 
Published: July 2006

Abstract
The fixed Mo catalysts with well-defined structures prepared by the facile reactions between Mo(χ-C3H5)4 and acidic OH groups of supports like γ-alumina, silica-alumina and silica, followed by the stoichiometric uptake of H2, O2 or Cl2, were very active for olefin metathesis, where the coordinatively unsaturated tetravalent Mo uniformly populated on the surface was found to be the actual active site.
A DUALITY OF MECHANISM IN THE HOMOLYTIC SUBSTITUTION REACTION OF ANTHRONE WITH 1-CYANO-1-METHYLETHYL RADICALS
Authors: Mitsuhashi Tsutomu , Oki Michinori 
Published: July 2006

Abstract
The mechanism of the homolytic substitution reaction of anthrone with 1-cyano-1-methylethyl radicals has been discussed on the basis of kinetic isotope effects as well as CIDNP. Under non-basic conditions the abstraction-combination mechanism is suggested, whereas the addition-disproportionation mechanism via anthranol prevails under basic conditions.
OXETANES DERIVED FROM N-METHYLGLUTARIMIDE AND THEIR ISOMERIZATION IN ACIDIC MEDIA
Authors: Maruyama Kazuhiro , Ogawa Takuji , Kubo Yasuo 
Published: July 2006

Abstract
Irradiation of an acetonitrile solution of N-methylglutarimide 3 and an olefin 4 gave oxetanes 5 in a high yield. The oxetanes 5 were converted smoothly to homoallyl alcohols, 3,4-dihydro-6-(2-hydroxyalkyl)-1-methyl-2(1H)-pyridones 6 by refluxing in acidic media.
DETERMINATION OF RADIOACTIVE RARE GASES BY SOLVENT EXTRACTION FOLLOWED BY γ-RAY SPECTROMETRY
Authors: Yanokura Minoru , Horiuchi Kimiko , Nakahara Hiromichi , Murakami Yukio 
Published: July 2006

Abstract
Low levels of radon in various samples such as natural waters and the non-condensable gas from geothermal wells were extracted with toluene, and submitted to γ-ray spectrometry. This extraction method remarkably improved the detection limit so that identification and determination of low level radioactive rare gases became feasible.
PHOTOLYSIS AND THERMOLYSIS OF 2,2-DIPHENYL-2-HYDROXYETHYL-BIS(DIMETHYLGLYOXIMATO)PYRIDINE COBALT(III), 2,2-DIPHENYL-2-HYDROXYETHYL COBALOXIME
Authors: Tada Masaru , Okabe Masami , Miura Kyo 
Published: July 2006

Abstract
Photolysis of 2,2-diphenyl-2-hydroxyethyl cobaloxime in the absence of oxygen gave deoxybenzoin, with phenyl rearrangement, and 1,1-diphenylethanol, with hydrogen abstraction, in various solvents. Thermolysis gave the similar results but the formation of 1,1-diphenylethylene becomes a major process.
SYNTHESIS OF BrMe2Sn–Mn(CO)3(PPh3)2 BY AN UNUSUAL METHYL ELIMINATION REACTION FROM Me3SnBr IN THE PRESENCE OF [Mn(CO)3(PPh3)2]− ANION AND ITS CRYSTAL STRUCTURE ANALYSIS
Authors: Onaka Satoru 
Published: July 2006

Abstract
A reaction of the title anion with Me3SnBr at reflux temperature in THF gave unexpected BrMe2Sn–Mn(CO)3(PPh3)2 in low yield. Its characterization and crystal structure are described.
IMPROVED MODIFIED RANEY NICKEL CATALYST FOR ENANTIOFACE-DIFFERENTIATING (ASYMMETRIC) HYDROGENATION OF METHYL ACETOACETATE
Authors: Harada Tadao , Izumi Yoshiharu 
Published: July 2006

Abstract
The enantioface-differentiating ability of the modified Raney nickel was enhanced by the use of an inorganic salt as an ingredient of the modifying solution. An optical yield of near 90 % was attained in the hydrogenation of methyl acetoacetate to methyl 3-hydroxybutyrate when tartaric acid and sodium bromide were chosen as the modifying reagents.
EFFECT OF PHENOL DERIVATIVE ON THE SELECTIVITY OF ORGANIC SULFONATE SELECTIVE ELECTRODE
Authors: Fujinaga Taitiro , Okazaki Satoshi , Hara Hirokazu 
Published: July 2006

Abstract
The interference of inorganic anions such as perchlorate,thiocyanate, and iodide against p-toluenesulfonate selective electrode decreased remarkably by the addition of p-t-octylphenol in o-dichlorobenzene medium. After infrared investigations, this phenomenon was attributed to the presence of hydrogen bonding between p-t-octylphenol and p-toluenesulfonate.
ISOLATION OF RISHITIN-M-1 FROM DISEASED POTATO TUBER TISSUE SLICES
Authors: Masamune Tadashi , Murai Akio , Takahashi Yu-koh , Yagihashi Fujio , Katsui Nobukatsu , Doke Noriyuki , Tomiyama Kohei 
Published: July 2006

Abstract
Isolation of rishitin-M-1, a metabolite of rishitin produced in healthy tissues of white potato, from diseased potato tuber slices and its convenient preparation from rishitin are described.
SHAPE-SELECTIVE CRACKING OF OCTANES OVER PARTIALLY CATION EXCHANGED H-MORDENITE
Authors: Namba Seitaro , Yashima Tatsuaki 
Published: July 2006

Abstract
Cracking of octanes over H–Y, H-mordenite, and partially cation exchanged H-mordenite was carried out. It was found that the original reactivities of octanes were 3-methylheptane &gt; 2,2,4-trimethylpentane &gt;&gt; octane and in the case of H-mordenite the order changed to octane&gt;&gt; 3-methylheptane &gt; 2,2,4-trimethylpentane. By the partial cation exchange only 2,2,4-trimethylpentane reactivity was decreased with the ionic radius of exchanged cation.
FERROMAGNETIC SPIN-EXCHANGE INTERACTION IN COPPER(II)–OXOVANADIUM(IV) COMPLEXES WITH 3-FORMYLSALICYLIC ACID-DIAMINE SCHIFF BASES. THE IMPORTANCE OF GROUND ELECTRONIC CONFIGURATION IN SPIN–SPIN COUPLING
Authors: Torihara Naoyuki , Okawa Hisashi , Kida Sigeo 
Published: July 2006

Abstract
Copper(II)-oxovanadium(IV) hetero-metal binuclear complexes with 3-formylsalicylic acid-diamine Schiff bases were prepared and their magnetic properties were explored in the temperature range 78–300°K. They obeyed the Curie–Weiss law (χM=C/(T-θ)) with positive Weiss constant (θ=18∼20°K), indicating ferromagnetic spin-exchange interaction between the metal ions. The magnetic properties of the present complexes were discussed in comparison with those of Cu(II)–M(II) complexes with the same ligands.
PALLADIUM CATALYZED REACTION OF BUTADIENE WITH ALCOHOLS USING ALKYL- AND ARYLSULFINATES AS COCATALYSTS
Authors: Tamaru Yoshinao , Kagotani Masahiro , Suzuki Ryoshu , Yoshida Zen-ichi 
Published: July 2006

Abstract
Sodium alkyl- and arylsulfinates serve as excellent cocatalysts for the palladium catalyzed dimerization of butadiene in alcohols to give 2,7-octadienyl alkyl (Me, Et, Pr, and i-Pr) ethers selectively together with small amounts of 2,7-octadienyl sulfones. 1,3,7-Octatriene is formed in less than 4% yield.
ANOMALOUS LIGHT SCATTERING OF POLY(2-METHYL-5-VINYLPYRIDINE) IN NITROETHANE
Authors: Sakamoto Noriyuki , Aramatsu Keisuke , Toki Kenji 
Published: July 2006

Abstract
The peculiar anomalous light scatterings have been repeatedly observed for poly(2-methyl-5-vinylpyridine) in nitroethane, which were suppressed by the addition of tetramethylammonium iodide. Such behaviors were found due to the intermolecular interference caused by some ionization of the polymer in the solution.
THE SYNTHESIS OF USEFUL CHIRAL PROSTANOID INTERMEDIATES AND NATURALLY OCCURRING PROSTAGLANDINS FROM AUCUBIN
Authors: Naruto Masanobu , Ohno Kiyotaka , Naruse Norio 
Published: July 2006

Abstract
The synthesis of optically active intermediate 9 for prostanoids from aucubin 1 was described, in which stepwise cleavage of intramolecular cyclic acetal of tetrahydroanhydroaucubigenin 2 by ethanethiol in the presence of boron trifluoride was successfully accomplished. The synthesis of naturally occurring prostaglandins was also described.
POLYMERIZATION OF METHYL METHACRYLATE INITIATED WITH VANILLIN
Authors: Imoto Minoru , Maeda Takamasa , Ouchi Tatsuro 
Published: July 2006

Abstract
Vanillin was found to initiate the polymerization of methyl methacrylate(MMA) in benzene at 85 °C. The effects of the concentrations of vanillin and MMA on the rate of polymerization and on the degree of polymerization of poly-MMA were investigated. A probable initiation mechanism proposed. The polymerization is assumed to proceed through a radical mechanism. The polymeric effect of the polymer containing vanillin units was also studied.
SYNTHESIS AND PYROLYTIC DECARBONYLATION OF 4-CYCLOPENTENE-1,2,3-TRIONE
Authors: Kasai Masaji , Oda Masaji , Kitahara Yoshio 
Published: July 2006

Abstract
4-Cyclopentene-1,2,3-trione 1 is synthesized by either dehydration of 2,2-dihydroxy-4-cyclopentene-1,3-dione 4 or pyrolysis of 2-chloro-2-formyloxy-4-cyclopentene-l,3-dione 5 Pyrolysis of 1 gives the bis-ketene 6 by decarbonylation, which is confirmed by ring closure to cyclobutenedione 2 as well as by trapping with methanol or hydrogen chloride.
COOPERATIVE INCORPORATION OF POTASSIUM AND NITROGEN INTO METALLIC RUTHENIUM
Authors: Ohya Asao , Urabe Kazuo , Ozaki Atsumu 
Published: July 2006

Abstract
Nitrogen uptake by metallic ruthenium is enhanced by the presence of potassium vapor, simultaneously increasing the stable incorporation of potassium, demonstrating a “binder action” of nitrogen. The molar ratio of nitrogen uptake to the stable potassium suggests a chemical formula (KN2Ru)n, as supported by formation of hydrazine on hydrolysis.
SYNTHESIS AND PROPERTIES OF DIAMINOCYCLOPROPENYLIDENE TRANSITION METAL COMPLEXES
Authors: Konishi Hisatoshi , Matsumoto Shiro , Kamitori Yasuhiro , Ogoshi Hisanobu , Yoshida Zen-ichi 
Published: July 2006

Abstract
Neutral and cationic diaminocyclopropenylidene complexes of palladium (II) and platinum (II), trans-X2-μ-X2M2II(C3(NR2)2)2, (2; M=Pd, 3; M=Pt) , cis-R3′PX2MIIC3(NR2)2 (4; M=Pd), and [trans-(R3′P)2 XMIIC3(NR2)2]+ClO4− (5; M=Pd, 6; M=Pt) were synthesized. Stereochemistry of the peripheral dialkylamino groups was briefly discussed on the basis of infrared and 13C-nmr spectra. Low C–N stretching frequency and small rotational barrier about the C–N bond indicate that diaminocyclopropenylidene coordinates to the transition metal as a carbene.
THE SYNTHESIS OF dl-5-ACETYL-2-(1-HYDRXYMETHYLVINYL)-2,3-DIHYDROBENZOFURAN AND ITS ESTERS
Authors: Kawase Yoshiyuki , Yamaguchi Seiji , Kondô Seizô , Shimokawa Keiko 
Published: July 2006

Abstract
dl-Tremetone, synthesized conveniently from phenol in two steps, was oxidized by selenium dioxide in acetic anhydride to give dl-5-acetyl-2-(1-acetoxymethylvinyl)-2,3-dihydrobenzofuran, which was hydrolized to dl-form of the natural alcohol. The dl-alcohol was further esterified to dl-forms of the two natural esters.
ACID-CATALYZED [4+2]CYCLOADDITION BETWEEN ENAMINES AND BENZYLIDENEANILINES. SYNTHESIS OF 1,2,3,4-TETRAHYDROQUINOLINE DERIVATIVES
Authors: Nomura Yujiro , Kimura Muneaki , Takeuchi Yoshito , Tomoda Shuji 
Published: July 2006

Abstract
The enamines having an α-hydrogen, R1R2N-αCH=βCR3CH3, reacted with a variety of benzylideneanilines to provide the [4+2] cycloadducts, 1,2,3,4-tetrahydroquinoline derivatives, in acetic acid or in methanol containing a catalytic amount of p-toluenesulfonic acid in considerable yield.
FUNCTIONALIZATION OF AN UNACTIVATED CARBON ATOM IN A TRITERPENE BY DRY OZONATION. A FORMATION OF 15- AND 16- OXOFRIEDELATES
Authors: Akiyama Eri , Tada Masahiro , Tsuyuki Takahiko , Takahashi Takeyoshi 
Published: July 2006

Abstract
Dry ozonation of friedelane (1) afforded 18β,19β-epoxyfriedelane (2), 19-oxofriedelane (3), 16-oxofriedelane (5), and a new carbonyl compound, 15-oxofriedelane (4). On SeO2 oxidation, 4 and 5 gave the same 15 ,16-dioxofriedelane (6).
EFFECTS OF α- AND β-CYCLODEXTRINS ON BASE-CATALYZED ISOMERIZATION OF PROSTAGLANDIN A1 AND PROSTAGLANDIN A2
Authors: Uekama Kaneto , Hirayama Fumitoshi , Daiguji Masanori 
Published: July 2006

Abstract
Both α- and β-cyclodextrins (α-CyD, β-CyD) increased the isomerization rates of A-type prostaglandins (prostaglandin A1 and prostaglandin A2) in alkaline condition, where acceleration effect of α-CyD was somewhat different from that of β-CyD. Importance of the spacial relationship between host and guest molecules was reflected in kinetically determined formation constants, activation parameters, and thermodynamic parameters for inclusion complex formation.
LIMONOIDS FROM MELIA AZEDARACH LINN. VAR.JAPONICA MAKINO. III. THE STRUCTURES OF OHCHINAL AND OHCHININ ACETATE
Authors: Ochi Masamitsu , Kotsuki Hiyoshizo , Kataoka Toshiko , Tada Tetsuro , Tokoroyama Takashi 
Published: July 2006

Abstract
Two new limonoids, ohchinal and ohchinin acetate, have been isolated from the fruit of M. azedarach Linn. var. japonica Makino and their structures established as 1 and 2 on the basis of chemical and spectroscopic evidence.
IONIC DISSOCIATION CONSTANT OF TRIETHYLAMINE IN METHANOL UNDER HIGH PRESSURE AT 25°C
Authors: Inoue Hisayuki , Hara Kimihiko , Osugi Jiro 
Published: July 2006

Abstract
The ionic dissociation constant of the ionization of triethylamine in methanol have been determined from the measurements of electrical conductivities at high pressures up to 2000 kg/cm2 at 25°C. The observed dissociation constant increased from 0.50×10−6 mol/kg at 1 atm to 5.78×10−6 mol/kg at 2000 kg/cm2, and its pressure dependence was quantitatively explained by the change of intrinsic volume and electrostrictive volume with pressure.
ACID-CATALYZED CYCLIZATION OF 6,7-EPOXYHUMULA-2,9-DIENE. FORMATION OF 5,9-DIHYDROXY-4,8,11,11-TETRAMETHYLTRICYCLO[6.3.0.02,4]UNDECANE
Authors: Namikawa Misuzu , Murae Tatsushi , Takahashi Takeyoshi 
Published: July 2006

Abstract
Treatment of 6,7-epoxyhumula-2,9-diene (1) with 1.8 M H2SO4–Me2CO (1:1) at room temperature gave a novel tricyclic diol shown to be 5,9-dihydroxy-4,8,11,11-tetramethyltricyclo [6.3.0.02,4]undecane (8a; diol B), besides tricyclohumuladiol (2; diol A), humulenol-II (3), a diol C (4a), a diol D (4b), and an acetonide (7), while the same reaction at O °C yielded only 2. The results together with a time-dependent product analysis showed the initial formation of 2, which then transformed into 3, 4a, 4b, 7, and 8a.
1-FORMYLCYCLOHEPTATRIENE. SYNTHESIS BY VILSMEIER REACTION AS NOVEL DIRECT SUBSTITUTION OF CYCLOHEPTATRIENE AND ITS SEVERAL REACTIONS
Authors: Asao Toyonobu , Kuroda Shigeyasu , Kato Kazuo 
Published: July 2006

Abstract
1-Formylcycloheptatriene was obtained by Vilsmeier reaction as novel direct substitution of cycloheptatriene accompanying bitropyl. Reduction, Grignard reaction and condensation reaction of the formyl compound were investigated.
THE MOLECULAR STRUCTURE OF METHYLPHENYL(DIPHENYLSULFILIMINO)SULFONIUM PERCHLORATE
Authors: Nishikawa Yasuo , Matsuura Yoshiki , Kakudo Masao , Akasaka Takeshi , Furukawa Naomichi , Oae Shigeru 
Published: July 2006

Abstract
The structure of the titled compound (I) has been determined by X-ray crystallographic techniques. (I) crystallizes in a triclinic space group P\bar1 with a=9.98, b=11.06, c=9.71 Å, α=81.0, β=76.1, γ=75.3° and Z=2. The cationic charge of (I) localizes predominantly on the sulfur atom (S(2)) of methyl phenyl sulfide. The bond length between the nitrogen atom and the sulfur atom (S(1)) of diphenyl sulfide is shorter than that of N-S(2) (1.60 and 1.67 Å, respectively).
ANODIC OXIDATION OF 4-ALLYL-2-METHOXYPHENOL SYNTHESES OF DEMETHOXYASATONE AND DEMETHOXYISOASATONE
Authors: Iguchi Masanobu , Nishiyama Atsuko , Terada Yukimasa , Yamamura Shosuke 
Published: July 2006

Abstract
Anodic oxidation of 4-allyl-2-methoxyphenol was carried out under various conditions, using an undivided cell, to afford two dienones (3 and 4) and two dimeric compounds (5 and 6). The dienone (4) was readily converted into demethoxyasatone (6), which was further subjected to photochemical reaction giving demethoxyisoasatone (7) in a good yield.
A SYNTHESIS OF DIASTEREOMERS OF (±)-LABDA-7,14-DIEN-13-OL THROUGH STEREOSPECIFIC CYCLIZATION OF FARNESYL PHENYL SULFONE
Authors: Torii Sigeru , Uneyama Kenji , Kawahara Ichiro , Kuyama Manabu 
Published: July 2006

Abstract
The cyclization of farnesyl phenyl sulfone 1 by treatment with SnCl4 in benzene gave a drimane-type compound 2, which was converted to diastereomers of (±)-labda-7,14-dien-13-ol 3.
ABNORMAL THERMAL EXPANSION AND SOLID-STATE RACEMIZATION OF COBALOXIME COMPLEX CRYSTAL
Authors: Ohashi Yuji , Sasada Yoshio , Ohgo Yoshiaki 
Published: July 2006

Abstract
The crystals of R-α-cyanoethyl(S-α-methylbenzylamine)cobaloxime exhibit abnormally anisotropic thermal expansion coefficients. The racemization of the cyanoethyl group in the crystalline state by X-ray exposure [Ohashi and Sasada, Nature, 267, 142 (1977)], is no longer observed below 173K. From structure analyses at 173K and room temperature, the mechanism of the racemization has been made clear.
RESTRICTED ROTATION INVOLVING THE TETRAHEDRAL CARBON.XXI. DIRECT OBSERVATION OF HINDERED ROTATION ABOUT A Csp3–C(=O) BOND IN PERISUBSTITUTED 9-(1-METHOXYCARBONYL-1-METHYLETHYL)TRIPTYCENES BY 1H NMR SPECTRA
Authors: Otsuka Soichi , Kihara Hiroshi , Mitsuhashi Tsutomu , Oki Michinori 
Published: July 2006

Abstract
The methoxyl protons of the dl form of the title compound which carries a chloro group in one of the peri positions show a broad signal in 1H NMR spectra at room temperature. The phenomenon is attributed to slow rotation about the Cα–C(=O) bond in the ester moiety by DNMR study. A similar phenomenon is observed with the dl form of the triptycene bearing a methyl group, but neither of the meso forms of triptycenes show splitting of the methoxyl signal. Activation parameters are obtained by total line-shape analysis.
EFFECTS OF SOLVENTS ON THE ENANTIOFACE-DIFFERENTIATING (ASYMMETRIC) ADDITION OF BUTYLLITHIUM TO BENZALDEHYDE USING (2S, 2′S)-2-HYDROXYMETHYL-1-[(1-METHYLPYRROLIDIN-2-YL)METHYL]PYRROLIDINE AS A CHIRAL LIGAND
Authors: Soai Kenso , Mukaiyama Teruaki 
Published: July 2006

Abstract
Effects of solvents were examined on the enantioface-differentiating addition of butyllithium to benzaldehyde using (2S, 2′S)-2-hydroxymethyl-1-[(1-methylpyrrolidin-2-yl)methyl]pyrrolidine as a chiral ligand. Very high optical purity (95%) was attained when the addition was carried out in a 1:1 mixture of dimethoxymethane and dimethyl ether at −123°C.
ISOTOPE EFFECTS IN THE EMISSION CROSS SECTION OF THE BALMER LINES (β,γ,δ) PRODUCED BY CONTROLLED ELECTRON IMPACT ON HCl AND DCl
Authors: Ogawa Teiichiro , Higo Morihide , Toyoda Minoru , Ishibashi Nobuhiko 
Published: July 2006

Abstract
The relative emission cross section (σD⁄σH) of the excited hydrogen and deuterium atoms produced in the dissociative excitation of HCl and DCl by 300 eV electrons revealed an isotope effect, which varied with the principal quantum number of the excited atoms.
σD⁄σH β:0.83±0.04, γ:0.87±0.04, δ:0.93±0.05.
MÖSSBAUER SPECTROSCOPIC STUDY ON THE MIXED- AND AVERAGED-VALENCE FERROCENE DERIVATIVES
Authors: Motoyama Izumi , Watanabe Masanobu , Sano Hirotoshi 
Published: July 2006

Abstract
Mixed-valence compound of diferrocenylacetylene and averaged-valence compound of [2.2]ferrocenophane-1,13-dxyne were prepared by the reaction of the corresponding neutral compounds with iodine in benzene. The Mössbauer results have clearly shown that strong interactions through the conjugated π-systems between two iron atoms are present in the latter compound.
ALDOL CONDENSATION WITH COPPER(II) COMPLEX CATALYSTS. MODEL REACTIONS OF CLASS II ALDOLASE
Authors: Irie Kazuo , Watanabe Ken-ichi 
Published: July 2006

Abstract
The aldol condensation of benzaldehyde with 2-butanone, catalyzed by 2,2′-bipyridine or ethylenediamine copper(II) complexes, afforded the regioselective reaction product at the C1-position of 2-butanone. The yield and regioselectivity of the aldol condensation was affected by the ligand species and numbers of ligand molecule.
STEREOSPECIFICITY AND REGIOSELECTIVITY OF CYCLOADDITION REACTIONS OF o-THIOQUINONE METHIDE
Authors: Okazaki Renji , Kang Kyung-Tae , Sunagava Kazuhiko , Inamoto Naoki 
Published: July 2006

Abstract
o-Thioquinone methide reacted with maleonitrile, fumaronitrile, methyl vinyl ketone, and acrylamide to give [4+2] cycloadducts. The former two reactions proceeded stereospecifically and the latter two regioselectively. The mode of these reactions are compared with those of the reactions with an enamine and of dimerization.
PREPARATION AND PROPERTIES OF METHYL-SUBSTITUTED BENZANNELATED BISDEHYDRO[13]ANNULENONES
Authors: Ojima Juro , Fujiyoshi Masamitsu 
Published: July 2006

Abstract
Preparation of methyl-substituted monobenzo- 5, 6, and dibenzobisdehydro[13]annulenone 7 is described. The influence of methyl substituent and benzannelation upon the structure and tropicity of bisdehydro[13]annulenone is discussed.
ANALYSIS OF ETHYL NITRATE BY CHEMICAL IONIZATION MASS SPECTROMETRY
Authors: Suzuki Shin , Koga Osamu , Das Rebati C 
Published: July 2006

Abstract
Mass spectrometry by chemical ionization using CH4 and iso-C4H10 is found to be very suitable for identification and quantitative analysis of ethyl nitrate necessary for air-pollution study. It produces protonated molecular ion which is not obtained in the electron impact method.