bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis, Structure, and Oxidation of Novel 4,7-Disubstituted Benzotrithioles. Formation and Characterization of Radical Cations with 11π Electron Framework
Authors: Ogawa Satoshi , Saito Satoshi , Kikuchi Takamasa , Kawai Yasushi , Niizuma Shigeya , Sato Ryu
Published: March 2006

Novel benzene fused cyclic polysulfides, 4,7-disubstituted benzotrithioles, are synthesized and characterized by X-ray crystallographic analysis, and their one-electron oxidation resulted in the formation of stable 4,7-disubstituted benzotrithiolium radical cations with an 11π electron framework.
Structural Properties Required for Two-photon Photochromism of Pyran Derivatives
Authors: Uchida Manabu , Irie Masahiro
Published: March 2006

The photochromism of two new photochromic quinone monomethide derivatives was examined. While the 12aH-12a-methylnaphtho[3,2]chromene underwent a two-photon photochromic reaction, only a single-photon photochromic reaction between a keto form and an oxabicylcohexene form was observed for the phenanthrene analog.
Protoporphyrin and Zinc Protoporphyrin in the Blood of Tumor Transplanted Mice
Authors: Nishisaka Tsuyoshi , Fukami Takaaki , Tabata Kenji , Wohrle Dieter , Okura Ichiro
Published: March 2006

Fluorescence at 630 nm was detected from the blood of tumor implanted mice. The fluorescence was attributed to protoporphyrin and zinc protoporphyrin. The fluorescence intensity increased with the increase of the period from tumor implantation and then decreased. By measuring the fluorescence intensity of the blood, the progress of cancer will be followed.
NADH Models in the Pyrrolo[3,4-b]pyridine Series. Role of the Cyclized Structure in the Stereocontrol of Reductions
Authors: Bédat Joëlle , Levacher Vincent , Dupas Georges , Quéguiner Guy , Bourguignon Jean
Published: March 2006

The synthesis of a chiral NADH model in pyrrolo[3,4-b]pyridine series is described and the asymmetric reduction of methyl benzoylformate is studied. Its asymmetric behavior compared with a cyclized analogue in naphthyridine series suggests that the orientation of the carbonyl group of the lactam plays an important role in the stereochemical control of the reduction.
N-Alkyloxycarbonyl Isobutylamides as Readily Prepared Diamide Derivatives of Amino Acids for Separation of Enantiomeric Isomers by Chiral Phase Capillary Gas Chromatography
Authors: Abe Iwao , Kawazuma Masatoshi , Fujimoto Noriteru , Nakahara Taketoshi
Published: March 2006

Amino acid diamide derivatives of N-alkyloxycarbonyl isobutylamides have been prepared from corresponding N-alkyloxycarbonyl 2,2,2-trifluoroethyl esters and provided for use in separation of enantiomeric isomers by chiral phase capillary gas chromatography. The substitution reaction of 2,2,2-trifluoroethyl ester with isobutylamine was found to proceed almost completely within 5 min at room temperature. All the diamide derivatives prepared have increased the separation factor including Pro.
Photoinduced Hydrogen Evolution with Hydrogenase and Cytochrome c3
Authors: Kamachi Toshiaki , Hiraishi Tomohiro , Okura Ichiro
Published: March 2006

The photoreduction of cytochrome c3 using ZnTPPS as photosensitizer was investigated and the photoinduced hydrogen evolution with hydrogenase using cytochrome c3 as electron carrier was established. The quenching of photoexcited triplet state of ZnTPPS with cytochrome c3 was measured and the rate constant was 1.2 × 109 M−1s−1(1M = 1 mol dm−3).
Structure of Sargassumketone, a Novel Highly Oxygenated Ketone from Sargassum Kjellmanianum
Authors: Nozaki Hiroshi , Ohira Susumu , Takaoka Daisuke , Senda Naoto , Nakayama Mitsuru
Published: March 2006

The structure and stereochemistry of sargassumketone, a novel highly oxygenated ketone isolated from Sargassum kjellmanianum (the marine brown algae), have been elucidated on the basis of the spectroscopic and X-ray diffraction analysis.
Electro-Optical Properties of Polymer/(Liquid Crystal) Composite Film Fabricated by Two-step Phase Separation Method
Authors: Kawatsuki Nobuhiro , Ono Hiroshi
Published: March 2006

A polymer/liquid crystal (LC) composite film was fabricated by a combination of a solvent-induced phase separation method and a photo-polymerization-induced one, using polymethylmethacrylate (PMMA), LC and photo-curable monomers. Electro-optical properties for the composite films had a low driving voltage of 18 Vrms, a rapid turn-on time of 0.8 ms, a rapid turn-off time of 10 ms and a small hysteresis of less than 1Vrms.
Palladium(II) Catalyzed Carboxylation of Aromatic Compounds with CO under Very Mild Conditions
Authors: Taniguchi Yuki , Yamaoka Yoshinori , Nakata Kazuyuki , Takaki Ken , Fujiwara Yuzo
Published: March 2006

Aromatic compounds in trifluoroacetic acid were readily carboxylated with CO in the presence of a catalytic amount of palladium(II) acetate under mild conditions to give aromatic carboxylic acids in good yields.
Theoretical Analysis of the Hydrogen Wave on Platinum Single Crystal Electrodes
Authors: Narumi Hideyuki , Kita Hideaki , Murakami Hiroshi
Published: March 2006

The hydrogen waves on the low index planes of platinum single crystal electrode except the square-wave part for Pt(111), were qualitatively explained by the Huckel method for the adsorbed hydrogen orbitals with the periodic boundary conditions. The square-wave part was explained by the free electron model in the two dimentional adsorption layer.
A General Synthetic Procedure for N-Unsubstituted Isoxazolidines via Nitrone-Olefin Cycloaddition. Remarkable Catalytic Effect of Bu2SnO
Authors: Abiko Atsushi
Published: March 2006

The remarkable catalysis of Bu2SnO for nitrone formation in the nitrone-olefin cycloaddition reaction has been discovered, and has led to the development of a general method for the synthesis of N-unsubstituted isoxazolidine derivatives.
Multiple Hydrogen Bonding Network: A Novel Mode of Self-Recognition in a Layered Crystalline Structure of a Guanosine Derivative
Authors: Araki Koji , Abe Masanori , Ishizaki Akira , Ohya Tsutomu
Published: March 2006

A lamella-like layered structure of the nucleoside derivative was formed by tert-butyldimethylsilylation of the ribose hydroxy groups upon recrystallization from methanol, in which a novel mode of self-recognition of the guanine unit by multiple hydrogen bonding interaction plays an essential role to stabilize the crystal structure.
Extraction of Uranium(VI) from Nitric Acid Solution into Supercritical Carbon Dioxide Containing Tri-n-butylphosphate
Authors: Iso Syuichi , Meguro Yoshihiro , Yoshida Zenko
Published: March 2006

Uranium(VI) in the aqueous solution of (3–6) M (1 M = 1 mol dm−3) HNO3 + 3 M LiNO3 was extracted into supercritical CO2 fluid containing 3 vol% of tri-n-butylphosphate (TBP) at 60 °C and (1.5–3.5) × 107 Pa. Rapid and complete removal of CO2 medium from the extract was attained by gasification of CO2 at atmospheric temperature and pressure.
Preparation and Reactivities of Acyl(carboxylato)palladium Complexes
Authors: Nagayama Kazuhiro , Kawataka Futoshi , Sakamoto Masato , Shimizu Isao , Yamamoto Akio
Published: March 2006

Acyclic acid anhydrides oxidatively add to Pd(styrene)(PMe3)2 with C-O bond cleavage to give corresponding acyl(carboxylato)palladium(II) complexes 3a-3e that are isolated and identified. The acetato ligand in 3a is exchanged with added acetic acid. Treatment of 3a with formic acid at room temperature yields acetaldehyde, acetic acid and CO2. Reaction of 3a with dihydrogen liberates acetaldehyde, acetic acid and ethanol. Catalytic hydrogenolysis of octanoic and benzoic anhydrides into aldehydes and carboxylic acids was found to be catalyzed by Pd(PPh3)4.
A Novel Ru(VII)/Ru(IV) Mediatory System for Electrooxidation of Primary and Secondary Alcohols, Leading to Aldehydes and Ketones
Authors: Torii Sigeru , Yoshida Akihito
Published: March 2006

A soluble Ru(VII)/Ru(IV) redox system in MeCN/H2O(9/1 v/v)-Bu4NOH-(Pt/Pt) was found to be a mild oxidizing method for the electrochemical conversion of primary and secondary alcohols into their corresponding aldehydes and ketones under basic conditions.
Effect of Polyelectrolytes on Coal-Water Mixture in Dispersed/Coagulated States
Authors: Ukigai Toshiyuki , Sugawara Hitoshi , Tobori Norio
Published: March 2006

The Dispersion mechanism of highly loaded coal-water mixture (CWM) in the presence of a polyelectrolyte additive was investigated. Two important factors have been found : the ability of the additive to apply a sufficient electric repulsive force to the coal particles, and an appropriate affinity of the additive to the coal surface.
The Building of Antiparallel Four α-Helix Bundle Structure with a Pair of Pyrenylalanines on a Cyclic Pseudo-peptide Template
Authors: Arai Toru , Ide Yuji , Tanaka Yuji , Fujimoto Tsutomu , Nishino Norikazu
Published: March 2006

The 4α -helix bundle structure bearing a pair of pyrenylalanines as a fluorescence probe was built on a cyclic pseudo-peptide template and characterized by the pyrene excimer emission.
[4π+2π]Cycloadditions of o-Quinones and Symmetrical 6,6-Dialkyl and Cycloalkylfulvenes
Authors: Nair Vijay , Kumar Sasi , Rath Nigam P , Morton George O
Published: March 2006

3,5-Di-tert-butyl-o-benzoquinone on reaction with 6,6-dimethylfulvene furnished the bicyclo[2.2.2]adduct 9 whereas the 6,6-tetramethylenefulvene afforded a novel product 10, which presumably arises by the hetero Diels-Alder reaction of the quinone with the isomerized fulvene. The structure of 10 was confirmed by X-ray crystallography.
Reduction of NO at Very Low Concentration in Air with NH3 at Room Temperature over a Series of Calcined Pitch Based Active Carbon Fibers
Authors: Mochida Isao , Kawano Shizuo , Hironaka Motohiro , Yatsunami Shunsuke , Korai Yozo , Matsumura Yuji , Yoshikawa Masaaki
Published: March 2006

Catalytic activities of a series of pitch based active carbon fibers (ACFs) were examined for the reduction of NO (10 ppm) with NH3 (20 ppm) at 293 K. A particular ACF of 840 m2 g−1 surface area exhibited the excellent activities after the calcination at 1123 K, providing conversions of 75 and 47 % in dry and wet (80 % relative humidity) air, respectively, at W/F of 5 × 10−3 g min ml−1. The ACF of the largest surface did not show the largest activity.
Formation of Bilayer Structure in Organic Solvents from Amphiphiles Due to Interpeptide Hydrogen Bonding
Authors: Yamada Norihiro , Koyama Emiko , Kaneko Makoto , Seki Hiroko , Ohtsu Hiroshi , Furuse Takeshi
Published: March 2006

In order to produce molecular organization in a wide variety of media, novel amphiphiles containing an associative tripeptide moiety were prepared. Electron microscopy revealed bilayer formation from the amphiphile not only in water but also in nonpolar organic solvents. 1H-NMR spectroscopy gave direct evidence of interpeptide hydrogen bonding in the aggregate.
Farnesyl Diphosphate Synthase Reactions with Dimethylallyl Diphosphate Analogues Having Oxygen Atoms in Their Chains
Authors: Maki Yuji , Kurihara Masayo , Endo Takae , Abiko Megumi , Saito Kazuhiro , Watanabe Gotaro , Ogura Kyozo
Published: March 2006

Six dimethylallyl diphosphate analogues having oxygen atoms in their alkyl chains were found to act as substrate in the reaction catalyzed by pig liver farnesyl diphosphate synthase to give geranyl diphosphate analogues or farnesyl diphosphate analogues. The number of IPP incorporated into the product depended on not only the length of the chain but also its hydrophobicity.
A Novel Method for Constructions of β-d-Mannosidic, 2-Acetamido-2-deoxy-β-d-mannosidic, and 2-Deoxy-β-d-arabino-hexopyranosidic Units from the Bis(triflate) Derivative of β-d-Galactoside
Authors: Sato Ken-ichi , Yoshitomo Akira
Published: March 2006

The useful constructions of β-d-mannosidic, 2-acetamido-2-deoxy-β-d-mannosidic, and 2-deoxy-β-d-arabino-hexopyranosidic units from the same intermediate, 2,4-bis(O-trifluoromethanesulfonyl) derivative of β-d-galactoside, were achieved in a stepwise inversion at C-4 and C-2 by using cesium acetate, Bu4NBH4 and Bu4NN3 in good yields. Convenient and practical protections of β-d-mannoside to the straightforward synthesis of antennary oligosaccharides also achieved by using cesium trifluoroacetate.
Peptide Synthesis Mediated by Thiolsubtilisin Using Peptide Thioester as Building Block
Authors: Mihara Hisakazu , Maeda Shuko , Kurosaki Ryo , Ueno Satoko , Sakamoto Seiji , Niidome Takuro , Hojo Hironobu , Aimoto Saburo , Aoyagi Haruhiko
Published: March 2006

Peptides were efficiently synthesized by the catalysis of chemically engineered protease, thiolsubtilisin, with peptide thioesters as substrate building blocks. The ligation method was successfully applied to the synthesis of a partial sequence of DNA-binding c-Myb protein.
Contact Plating of Organic Thin Films onto a Novel Metal and ITO Plates by Reduction of Nonionic Surfactants Containing an Azobenzene Group
Authors: Saji Tetsuo , Igusa Yoshio , Kobayashi Ken , Liu Shunlin
Published: March 2006

Contact plating of organic thin films is demonstrated onto a noble metal (or ITO) plate short-circuited with an aluminum (or zink) plate in an aqueous dispersion containing organic pigments which are stabilized by nonionic surfactants containing an azobenzene group.
Formation of Pyruvic Acid by Oxidative Dehydrogenation of Lactic Acid
Authors: Ai Mamoru , Ohdan Kyoji
Published: March 2006

Lactic acid is converted to pyruvic acid with a high selectivity by a vapor-phase air oxidation over iron phosphate catalysts with a P/Fe atomic ratio of 1.2. The partially reduced iron phosphates show better catalyst performances than the fresh, fully reduced, or reoxidized iron phosphates.
Synthesis of a Carbocyclic Oxetanocin Using Photocycloaddition
Authors: Somekawa Kenichi , Hara Ryosuke , Kinnami Kazushige , Muraoka Fumiko , Suishu Takaaki , Shimo Tetsuro
Published: March 2006

All-cis-3-acetoxycyclobutane-1,2-dicarboxylate 4 was provided from a photochemical endo-[2+2]cycloadduct between maleic anhydride and vinyl acetate, and 4 was coupled with adenine and reduced with LiAlH4 to give a carbocyclic oxetanocin 6.
Ferromagnetic Spin Coupling of tert-Butylnitroxide Diradicals through a Conjugated Oligo(1,2-phenylenevinylene)-Coupler
Authors: Kaneko Takashi , Toriu Shuichi , Tsuchida Eishun , Nishide Hiroyuki , Yamaki Daisuke , Maruta Goro , Yamaguchi Kizashi
Published: March 2006

Ferromagnetic spin coupling of the tert-butylnitroxide diradicals connected to the oligo(1,2-phenylenevinylene)-skeleton was studied to relate with their π-conjugated electronic structure. The spin coupling constant (J) determined from their magnetic susceptibility increased with the degree of oligomerization in the conjugated skeleton and was reduced in response to the conjugated but spacing phenylenevinylene unit. These 2J values qualitatively agreed with the semiempirically calculated ones.
Synthesis and Structure of Novel Thiolato-, Selenolato- or Tellurolato-Bridged 1,1′-Ferrocenediyldiplatinum Complexes
Authors: Onitsuka Kiyotaka , Yoshida Toshiya , Ichimura Akio , Adachi Tomohiro , Yoshida Toshikatsu , Sonogashira Kenkichi
Published: March 2006

Reaction of 1,1′-ferrocenediyldiplatinum complex with disulfide, diselenide or ditelluride results in the formation of thiolato-, selenolato- or tellurolato-bridged 1,1′-ferrocenediyldiplatinum complexes. The structure of a μ-thiolato complex was determined by an X-ray crystallography. The μ-thiolato complex was also prepared by the treatment of the μ-hydroxo 1,1′-ferrocenediyldiplatinum complex with thiophenol.
Preparation and Property of Langmuir-Blodgett Film of N,N′-ω-p-Xylene-bis-[stearyldimethylammonium chloride]
Authors: Takahashi Masashi , Tajima Kazuo , Takaoka Kyo , Kobayashi Koichi
Published: March 2006

The fabrication of Langmuir-Blodgett (LB) film of N,N′-ω-p-xylene-bis-[stearyldimethylammonium chloride] (XSAC) and the adsorption of α-naphthol orange (NO) molecules onto these XSAC LB films were investigated by FTIR and UV-visible spectroscopies. It was found that the adsorption of NO molecules onto the XSAC LB film took place selectively at the molar fraction of XSAC, 0.25 and NO molecules on the LB film were almost oriented parallel to the substrate surface.
Convenient Synthesis of (+)-Decarestrictine L
Authors: Nokami Junzo , Taniguchi Takuya , Ogawa Yôzo
Published: March 2006

(+)-Decarestrictine L was prepared via intramolecular 1,4-addition of the oxy-anion, derived from trialkylsilyl ether with Bu4NF, to the internal γ-hydroxy enone functionality, formed by the reaction of p-chlorobenzenesulfinylpropan-2-one with R-5-t-butyldimethylsilyloxyhexanal.
Ionic Conductivity of Ln10(SiO4)6O3 (Ln = La, Nd, Sm, Gd and Dy)
Authors: Nakayama Susumu , Aono Hiromichi , Sadaoka Yoshihiko
Published: March 2006

Electrical properties were investigated for lanthanoid-silicates of Ln10(SiO4)6O3(Ln = La, Nd, Sm, Gd and Nd). The conductivity at 773 K was 2.3 × 104 S cm−1 for Nd10(SiO4)6O3. The sole carrier is the O2− ion, which was determined using an O2 gas concentration cell.
A Direct Evidence for Trivalent Ion Conduction in Solids
Authors: Imanaka Nobuhito , Kobayashi Yasuyuki , Adachi Gin-ya
Published: March 2006

In order to realize a higher valency ion conduction in solids, the Sc2(WO4)3 material which possesses a larger tunnel size for ion migration was selected to reduce the electrostatic interaction and the single crystals of Sc2(WO4)3 were grown to eliminate grain boundary effects found in polycrystalline state. By both the alternative and direct current measurements, a direct evidence of Sc3+ trivalent ion migration in single crystal Sc2(WO4)3 has been successfully demonstrated.
A Slab-Optical-Waveguide Absorption Spectroscopy of Langmuir-Blodgett Films with a White Light Excitation Source
Authors: Kato Kenji , Takatsu Akiko , Matsuda Naoki , Azumi Reiko , Matsumoto Mutsuyoshi
Published: March 2006

A novel slab optical waveguide (SOWG) technique with a white light excitation source was applied to the spectroscopy of LB monolayer samples. Absorption spectra of a Cu-porphyrin complex in LB films at concentrations of 0.1–0.5 monolayers were observed in the wavelength range of 380 to 650 nm. Polarized spectra giving information on the molecular orientation in the ordered thin films were also measured.
Synthesis, Structure, and Complexation Properties of Monoazacryptands
Authors: Nakatsuji Yohji , Sunagawa Takuya , Masuyama Araki , Kida Toshiyuki , Ikeda Isao
Published: March 2006

New types of monoazacryptands were prepared and their complexation properties towards alkali metal cations were examined using the solvent extraction method, UV spectroscopy, X-ray crystal analysis, and liquid membrane transport. A lipophilic macrobicyclic polyether consisting of two 18-crown-6 rings and one 20-crown-6 ring was found to be a highly selective potassium ion carrier through a bulk liquid membrane by pH control.
The Photocatalytic Isomerization of 2-Butenes on ZrO2 Catalyst with Low Coordinated Surface Sites
Authors: Moon Sang-Chul , Hieida Takeshi , Yamashita Hiromi , Anpo Masakazu
Published: March 2006

The photocatalyzed isomerization of cis-2-butene has been investigated on active ZrO2 catalysts which exhibited a typical photoluminescence associated with low coordinated surface sites. A geometrical isomerization reaction occurred predominantly and with high efficiency under UV-irradiation of the ZrO2 catalyst in the presence of cis-2-butene. A good parallel between the photoluminescence intensity and the rate of photocatalytic activity clearly indicated that the low coordinated surface sites play a significant role in the photocatalytic isomerization of cis-2-butene on the active ZrO2 catalysts.
Acid-promoted C1-C2 Bond Fission and Subsequent 1,5-Sulfenyl Shift of 1-Acceptor-1-sulfenyl-substituted 2-Vinylcyclopropanes. Formation of 6-Sulfenyl-α,β-γ,δ-unsaturated Carboxylic Esters and Nitriles
Authors: Kataoka Tadashi , Matsumoto Harutoshi , Iwama Tetsuo , Shimizu Hiroshi
Published: March 2006

1-Acceptor-1-sulfenyl-substituted 2-vinylcyclopropanes were isomerized to 6-sulfenyl-α,β-γ,δ-unsaturated carboxylic esters and nitriles via a C1-C2 bond fission and via a 1,5-sulfenyl shift using an acid catalyst.
Preparation of Alkyl Silyl Acetals from Carboxylic Esters with tert-Butyldimethylsilyldihalomethyllithium. 1,3-Rearrangement of Silyl Group from Carbon to Oxygen
Authors: Shinokubo Hiroshi , Oshima Koichiro , Utimoto Kiitiro
Published: March 2006

Treatment of ethyl benzoate or isopropyl formate with tert-butyldimethylsilyldibromomethyllithium gave alkyl silyl mixed acetal via 1,3-rearrangement of silyl group from carbon to oxygen. The reaction of the mixed acetals with allylsilane in the presence of Lewis acid afforded allylated ethers.
Synthesis and Structure of Octahedral Nickel(IV) Complexes Containing Two Chelating Acylphenolato Ligands
Authors: Klein Hans-Friedrich , Bickelhaupt Alfred , Lemke Mathias , Jung Thomas , Röhr Caroline
Published: March 2006

2-Acylphenolato complexes can be oxidized using iodine or diiodoalkanes at ambient conditions to afford low-spin d6 complexes . The molecular structure of the 5-tert-butyl-3-methyl derivative contains two axial trimethylphosphines and a cisoidal arrangement of two acylphenolato dianions in equatorial positions.
Reactivity Enhanced Selectivity. Dienophile Dependent π-Facial Selectivity in the Diels-Alder Reactions of 5-Substituted 1,3-Cyclopentadienes
Authors: Ishida Masaru , Kakita Shizuko , Inagaki Satoshi
Published: March 2006

Against a frequently held view in organic chemistry, it was proposed that the selectivity is enhanced by the reactivity in a certain class of reactions. The reactivity-enhanced selectivity (RES) theory was experimentally confirmed by the π-facial selectivities in the Diels-Alder reactions of 5-phenylthiocyclopentadiene dependent on the reactivities of dienophiles.
Characteristic O2-Binding of Lipidprotoheme in Phospholipid Bilayer Membrane
Authors: Kawai Noriyuki , Komatsu Teruyuki , Yanagimoto Tetsuya , Nishide Hiroyuki , Tsuchida Eishun
Published: March 2006

A protoporphyrin IX derivative having three long alkyl chains and an axial imidazole (lipidprotoporphyrin) was homogeneously embedded into the bilayer membrane of the phospholipid vesicle. The O2-binding affinity of the lipidprotoheme was affected by the phase transition of the bilayer membrane, reflecting the change in the O2-association rate constant.
Synthesis of RGDFPASS-containing Cystine Peptides and Isolation of RGD-recognizing Receptor in Sand Dollar Embryo by the Peptide-Affinity Chromatography
Authors: Yamamoto Yasuo , Katow Hideki , Sofuku Shosuke
Published: March 2006

RGDFPASS-containing cystine decapeptides were synthesized by the solution method. These peptides strongly inhibited platelet aggregation. N-Acetyl and C-methoxy peptide ([Phe5]-FR-1-AM) having amphiphilic structure exhibited especially high activity as a platelet aggregation inhibitor. A 240 kDa RGD-recognizing receptor was obtained from a sand dollar embryo by RGDFPASS-containing peptide-affinity chromatography.
Magnesium Bromide-Promoted E⁄Z-Isomerization of Carbonyl-Conjugated Nitrones and Highly Stereo- and Regioselective Cycloadditions to Allylic Alcohol Dipolarophiles
Authors: Kanemasa Shuji , Tsuruoka Takashi
Published: March 2006

A Lewis acid promotes the E- to Z-isomerization of carbonyl-conjugated nitrones. The MgBr2•Et2O-catalyzed cycloadditions to allylic alcohols lead to the exclusive formation of the exo-stereoisomers of isoxazolidine-5-methanols. Participation of the Z-nitrone/MgBr2 complexes is suggested.
Photocontrolled Attachment of Anti-Azobenzene Antibody onto Azobenzene-Linked Quartz Surfaces
Authors: Kawashima Kazuo , Sisido Masahiko , Ichimura Kunihiro
Published: March 2006

Peptides carrying azobenzene group were covalently linked to surfaces of quartz plates and the plates were reacted with a monoclonal antibody against trans-azobenzene group. The amount of antibody attached was estimated by an AFM observation of gold-labeled anti-mouse IgG antibodies that were bound to the anti-azobenzene antibody. The number of the gold particles decreased significantly when the peptides on the quartz plate were irradiated with UV light prior to the attachment of the anti-azobenzene antibody.
Synthesis of 5,6,17,18-Bisdehydrotetrathia[24]annulene[2.2.2.2]. A Strained Planar Annulene Devoid of Peripheral Conjugation
Authors: Kawase Takeshi , Darabi Hossein Reza , Uchimiya Rika , Oda Masaji
Published: March 2006

5,6,17,18-Bisdehydrotetrathia[24]annulene[2.2.2.2], synthesized through a sequence of the McMurry coupling of 1,1-dichloro-2,2-di(5-formyl-2-thienyl)ethene and a novel double Fritsch-Buttenberg-Wiechell rearrangement, has a planar X-ray structure with bent triple bonds and short S-S contacts but shows little sign of peripheral conjugation.
Synthesis of Quinolines via Intramolecular Cyclization of Benzylacetone Oxime Derivatives Catalyzed with Tetrabutylammonium Perrhenate(VII) and Trifluoromethanesulfonic Acid
Authors: Kusama Hiroyuki , Yamashita Yuko , Narasaka Koichi
Published: March 2006

Intramolecular cyclization reaction on the nitrogen atom of benzylacetone oxime derivatives, which have electron donating group(s) on the phenyl group, proceeds by treatment with tetrabutylammonium perrhenate, trifluoromethanesulfonic acid, and 4-chloranil in refluxing 1,2-dichloroethane to afford quinoline derivatives in good yield.
C=S Bond Fission in Coordinated Thioureas and Formation of a Sulfide-bridged Dinuclear Pd(II) Complex
Authors: Okeya Seichi , Kameda Hidemi , Kawashima Hiromu , Shimomura Hiroshi , Nishioka Takanori , Isobe Kiyoshi
Published: March 2006

A reaction of [Pd(tol2TU−1-N,S)2] (tol2TU = 1,3-di(o-tolyl)thiourea) with dppm affords [Pd(tol2TU−2-N,S)(tol2TU-S)(dppm-P)] (1). Complex 1 is gradually converted into [Pd2(μ-S)(μ-dppm)2(tol2TU−1-S)2] (2), with a sulfide bridge via CS bond activation in tol2TU. X-ray diffraction study shows that complex 2 has an A-frame dinuclear Pd(II) structure without a Pd-Pd.
Convenient and Simple Preparation of Nitroolefins Nitration of Olefins with Nitric Oxide
Authors: Mukaiyama Teruaki , Hata Eiichiro , Yamada Tohru
Published: March 2006

Nitroolefins are conveniently prepared in high yields by nitration of olefins under an atmospheric pressure of nitric oxide at room temperature and subsequent treatment with acidic alumina.
Highly Efficient Regeneration of Carbonyl Compounds from Oximes, Tosylhydrazones, 1,3-Dithiolanes, and 1,3-Dithianes Using Cupric Nitrate Supported on Silica Gel
Authors: Lee Jong Gun , Hwang Je Pil
Published: March 2006

Cupric nitrate supported in silica gel is exceptionally efficient in regenerating aldehydes and ketones from oximes, tosylhydrazones, 1,3-dithiolanes, and 1,3-dithianes.
Optochemical HCl Gas Detection Based on Zinc Tetrabromotetraphenylporphyrin Dispersed in Ethyl Cellulose
Authors: Sadaoka Yoshihiko , Rodriguez Nena V , Tagliatesta Pietro
Published: March 2006

For zinc tetrabromotetraphenylporphyrin dispersed in a polymer matrix, the obsorbance at 479 nm and 722 nm is sensitive to sub-ppm levels of HCl gas and also good reversibilty is abserved at room temperature.
Application of Modified Mosher’s Method to α-Aromatic Secondary Alcohols. Exception of the Rule and Conformational Analyses
Authors: Ohtani Ikuko I , Hotta Kaori , Ichikawa Yoshiyasu , Isobe Minoru
Published: March 2006

The modified Mosher’s method was applied to the secondary alcohols possessing an aromatic ring on α-carbon. Some of the alcohols had the irregular Δδ values on β-protons, which were presumably due to the anisotropic effects of α-aromatic groups. In these cases, the absolute configurations were successfully determined by the modified Mosher’s method with elimination of irregular Δδ data.
Synthetic Model Approach to “Through-Bond” and “Through-Space” Electron Transfer Pathways
Authors: Higashida Suguru , Tsue Hirohito , Sugiura Ken-ichi , Kaneda Takahiro , Tanaka Yoshinori , Taniguchi Seiji , Okada Tadashi , Sakata Yoshiteru
Published: March 2006

In order to understand electron transfer pathways through bond and through space, a covalently linked porphyrin-quinone molecule with an inserted phenyl ring between the redox pair was prepared. The inserted π-system is not used as a stepping stone in electron-transfer pathways.
Double-Layered Tetrathiafulvalene as a Novel Electron Donor
Authors: Matsuo Koji , Takimiya Kazuo , Aso Yoshio , Otsubo Tetsuo , Ogura Fumio
Published: March 2006

A double-layered tetrathiafulvalenophane with four alkylenedithio spacers has been synthesized as a novel electron donor. Its structure has been elucidated by an X-ray crystal analysis to have a pair of face-to-face tetrathiafulvalenes with a small cavity in the center. Its electronic spectrum and cyclic voltammetry show a transannular interaction between both TTF units.
BF3-Catalyzed Reaction of Cyclobutene-1,2-dione Monoacetal and Its Vinylog with Allylsilanes. Regioselective Synthesis of 4-Allyl-4-ethoxycyclobutenones from Squaric Acid and Their Conversion to Bi- and Tricycloalkanones
Authors: Yamamoto Yoshihiko , Ohno Masatomi , Eguchi Shoji
Published: March 2006

Regioselective allylation of 2,4- and 4,4-diethoxycyclobutenones was performed with allylsilanes in the presence of BF3•Et2O via a common ethoxycarbenium ion intermediate. A merit of this reaction was demonstrated in an efficient conversion of the obtained 4-allyl-4-ethoxycyclobutenones to bi- and tricycloalkanones.
X-Ray Diffraction Study on Smectic Liquid Crystal State of Dimyristoylphosphatidylcholine
Authors: Tajima Kazuo , Imai Yoko , Ando Kazuto , Nakamura Akio , Koshinuma Masakatsu
Published: March 2006

In order to make clear the physical states of dimyristoylphosphatidylcholine (DMPC) in the smectic liquid crystal phase, the repeat distance of the bilayer was measured as a function of temperature by low-angle X-ray diffraction. It was found that the repeat distance decreased with increasing temperature, and its temperature dependence was different below and above T* (= about 29 °C), which was higher than the gel-liquid crystal temperature (TM = 23.9 °C). This T* temperature was interpreted as a temperature at which the bilayer of the (Lα + H2O) phase transformed from a partly pseudostable state to a fully stable state.
Syntheses and Characterization of Palladium and Platinum Complexes of Phosphorin
Authors: Shiotsuka Michito , Tanamachi Takahiro , Matsuda Yoshihisa
Published: March 2006

Palladium and Platinum complexes of 4,5-dimethyl-2-phenylphosphorin (dmppn) were synthesized through ligand exchange reactions with M(C6H5CN)2Cl2 (M = Pd, Pt). It was confirmed by means of 31P- and 13C-NMR spectroscopy that these complexes effect strong π-back donation from metal to phosphorin and have a square planar stucture with cis configuration in dichloromethane solution.
Synthesis and Electro-Optical Properties of Dihydrobenzofurans and Dihydrofuropyridines as Chiral Dopants for Ferroelectric Liquid Crystals
Authors: Kusumoto Tetsuo , Sato Ken-ichi , Hiyama Tamejiro , Takehara Sadao , Ito Kayoko
Published: March 2006

Optically active dihydrobenzofurans and dihydrofuropyridines were synthesized and shown to be good chiral dopants for ferroelectric liquid crystals.
Enzymatic Preparation of Alkanedicarboxylic Acid Monoesters
Authors: Ozaki Eiji , Uragaki Toshitaka , Sakashita Keiichi , Sakimae Akihiro
Published: March 2006

Hydrolysis of alkanedicarboxylic acid dimethyl esters using esterase from Pseudomonas putida MR-2068 gave exclusively pure monoesters. Hydrolytic activities were dependent on the carbon chain length of the substrates. This esterase also catalysed enantio- and regio-selective hydrolysis of α-methylalkanedicarboxylic acid dimethyl esters.
Partial Oxidation of Propane to Acrylic Acid over Reduced Heteropolymolybdate Catalysts
Authors: Ueda Wataru , Suzuki Yasuhiro
Published: March 2006

Propane was catalytically oxidized to acrylic acid and acetic acid with molecular oxygen at 360 °C over heteropolymolybdophosphoric acids which were treated with pyridine in the catalyst preparation. Under presently optimized reaction conditions 24% selectivity to acrylic acid and 15% to acetic acid were achieved at 12% conversion of propane. A reduced state of the catalyst generated by heat-treatment of the pyridine-treated heteropoly acid is important for the selectivities.
Diastereodivergent Chiral Synthesis of the Furofuran Lignans (+)-Sesamin and (−)-Asarinin
Authors: Samizu Kiyohiro , Ogasawara Kunio
Published: March 2006

Two diastereomeric lignans (+)-sesamin and (−)-asarinin have been prepared diastereodivergently via the common intermediate generated by the chirotopical Heck reaction.
Formation and Cycloreversion of Dioxadiazole Intermediates in the Reaction of Diazo Compounds with Singlet Oxygen
Authors: Nojima Takayuki , Ishiguro Katsuya , Sawaki Yasuhiko
Published: March 2006

Product ratios of N2/N2O as an indicator for carbonyl oxide formation in the 1O2 oxygenation of phenyl diazomethanes were not affected by protic solvents but were significantly increased by electron-donating substituents. A mechanism is suggested in which 1,2,3,4-dioxadiazole intermediates are formed by the cycloaddition of 1O2 and diazomethanes and its cycloreversion is controlled by the relative stability of resulting carbonyl oxides.
Photolysis of 1,2,4,5-Benzenetetracarboxylic Dianhydride in a Low-Temperature Argon Matrix. Direct Observation of Reactive Intermediates Stepwise Produced
Authors: Moriyama Masaya , Ohana Tsuruyoshi , Yabe Akira
Published: March 2006

Irradiation of 1,2,4,5-benzenetetracarboxylic dianhydride produced stepwise a cyclopropenone and benzyne intermediates with the release of CO2 and CO in a low-temperature argon matrix. In the final stage the further extrusion of CO2 and CO gave 1,3,5-hexatriyne which was a potential product in the ring-opening reaction of benzdiyne.
Oxidation of Allylic Alcohols by Means of Electrochemical Methodology. Novel Rearrangement of Prenol under Direct Anodic Oxidation Conditions
Authors: Maki Shojiro , Konno Katsuhiro , Takayama Hiroaki
Published: March 2006

Electrochemical oxidation of naturally occurring allylic alcohols is described. Under direct anodic oxidation conditions, prenol 1 was readily oxidized, followed by rearrangement presumably on the surface of the anodic electrode, to give 3-hydroxy-2,2′-dimethyl-1,1′-dimethoxy propane 2 in high yield, whereas geraniol 5 afforded citral 6 under the same conditions.
Hydrogen Absorption Characteristics of Crystalline LaNi5 Prepared by Mechanical Alloying
Authors: Sakaguchi Hiroki , Sugioka Takuo , Adachi Gin-ya
Published: March 2006

Crystalline LaNi5 powder was synthesized by mechanical alloying of constituent metals preceding annealing at lower than a melting point of the alloy. The structure of the sample as mechanically alloyed was amorphous. After two-step heat treatments at 723 K in a stream of hydrogen and at 1273 K in helium, the crystalline sample was obtained. The hydrogen absorption characteristics of the crystalline sample were in fair agreement with those of the alloy prepared by a conventional melting technique.
Study of Interfacial Degradation of the Vapor-Deposited Bilayer of Alq3/TPD for Organic Electroluminescent (EL) Devices by Photoluminescence
Authors: Han Eun-Mi , Do Lee-Mi , Yamamoto Noritaka , Fujihira Masamichi
Published: March 2006

The interfacial change of a vapor-deposited TPD (N,N′-diphenyl-N,N′-bis-(3-methylphenyl)-[1,1′-biphenyl]-4,4′-diamine) and Alq3 (Tris-(8-hydroxyquinoline) aluminum) bilayer film was characterized by photoluminescence (PL) in the temperature range from room temperature to 80 °C under an ambient atmosphere. The TPD and the Alq3 film are widely used as a hole transport and an emitter layer, respectively, in organic electroluminescent (EL) devices (ITO/TPD/Alq3/metal). As the substrate plate, a slide glass was used in this work.

In an Alq3/TPD bilayered structure, two PL bands from Alq3 and TPD were observed and the relative PL intensity of Alq3 to that of TPD was increased with time. The change was accelerated with increasing temperature. In case of a co-deposited single layer of TPD and Alq3, an Alq3 PL band predominated and, in addition, the PL intensity was not changed remarkably with increasing temperature. These results support that the PL change observed for the Alq3/TPD bilayered structure is ascribed to quenching of photo-excited TPD by Alq3 as a result of diffusion of the components into each other layer.
Synthesis and X-Ray Structure of 1,8-Bis(phenyltelluro)naphthalene and Its Peri Tellurium-Tellurium Interaction
Authors: Fujihara Hisashi , Ishitani Hideya , Takaguchi Yutaka , Furukawa Naomichi
Published: March 2006

New 1,8-diaryl and dialkyl substituted ditelluronaphthalenes, 1,8-bis(phenyltelluro)naphthalene (1) and 1,8-bis(butyltelluro)naphthalene, have been synthesized. The cyclic voltammogram of 1 showed the reversible electrochemical oxidation with remarkably low oxidation potential. The peri telluronio-tellurenyl interaction in the telluronium cation of 1 was identified by 125Te NMR spectroscopy.
Three-Dimensional Sulfur-Based π-Donor: A Novel Dimeric TTF Derivative of a Cross-Cyclophane Type
Authors: Tanabe Jun , Kudo Tomoyuki , Okamoto Maki , Kawada Yuzo , Ono Go , Izuoka Akira , Sugawara Tadashi
Published: March 2006

A novel dimeric TTF derivative (1) of a cross-cyclophane type was prepared through an intramolecular coupling of a cyclic tetramer of alkylated dmit. The crystal structure of 1·TCNQ indicates a unique sheet structure of 1 through face-to-face and two types of side-by-side interactions. Cyclic voltammetric measurement of 1 suggests the presence of intramolecular interaction between two donor units.
Selective Oxidative Coupling of p-Cresol Producing an ortho-ortho Direct-linked Dimer
Authors: Asakura Kouichi , Honda Eitoshi , Osanai Shuichi
Published: March 2006

The oxidative coupling reactions of p-cresol were carried out in its aqueous solution using FeCl3 as the oxidizing agent. In a highly concentrated p-cresol solution, the oxidative dimeric compound readily precipitated as oil droplets and was prevented from further oxidation to the trimeric compound. The formation of an ortho-ortho linkage has become superior to that of the ortho-para linkage in a more concentrated solution.
Stereospecific Deuteration of Chelated 2,2′-Thiodiacetate(tda) in [Co(dien)(tda)]+ (dien = diethylenetriamine) Observed in the Acidic D2O Solutions
Authors: Yonemura Toshiaki , Kawai Shoji , Ama Tomoharu , Kawaguchi Hiroshi , Yasui Takaji
Published: March 2006

Stereospecific deuteration rates of 2,2′-thiodiacetate (tda) in s-fac- and u-fac-[Co(dien)(tda)]+ were measured at 70.2 °C in D2O (pD range 4.4 – 6.4). The observed rate constants (k′) were proportional to the [OD−]. The large k′/[OD−] value (ca. 3.8 × 106) shows that the protons on the chelated -SCH2COO− ring are much more active than those on the chelated -NHCH2COO− ring.
Narrowing Size Distribution of CdS Nanocrystals by Size Selective Photocorrosion
Authors: Matsumoto Hajime , Sakata Takao , Mori Hirotaro , Yoneyama Hiroshi
Published: March 2006

Sequential irradiation with monochromatic light of 500, 480, 460, 430 nm of CdS nanocrystals (Q-CdS), whose average diameter was 4.9 nm with the standard deviation of 2.0 nm, steadily narrowed the size distribution to finally give a Q-CdS colloid having an absorption spectrum characteristic of highly monodispersed Q-CdS and an absorption onset of 430 nm.
Sodium Ion Photometry in Aqueous Media by a Dibenzo-16-crown-5 Chromoionophore
Authors: Hayashita Takashi , Kunogi Kenji , Takagi Makoto , Lee Jong Chan , Bartsch Richard A
Published: March 2006

A new chromoionophore sym-(decyl)(2-hydroxy-5-nitrobenzyloxy)dibenzo-16-crown-5 (1) is found to selectively respond to Na+ with a detection limit of 10−3 M (1 M = 1 mol dm−3) and no interference from K+ up to 0.05 M for detection of 10.0 mM Na+ in aqueous 1,4-dioxane solution.
Formation of a Vinylcarbene Complex of Chiral [Bis(4-isopropyloxazolin-2-yl)pyridine]-dichlororuthenium(II) from 3,3-Diphenylcyclopropene
Authors: Nishiyama Hisao , Park Soon-Bong , Itoh Kenji
Published: March 2006

A chiral vinylcarbene complex, (pybox)RuCl2(=CH-CH=CPh2) 3, [pybox = 2,6-Bis(4(S)-isopropyloxazolin-2-yl)pyridine], was obtained by reaction of (pybox)RuCl2(C2H4) 1 and 3,3-diphenylcyclopropene 2 at 60 °C for 4h. Asymmetric transfer of the vinylcarbene moiety from 3 to styrene was realized to give the corresponding trans- and cis-vinylcyclopropanes 7 and 8 in 74% yield with 53% ee and 56% ee, respectively.
Synthesis, Crystal Structure and Spectroscopic Properties of Singly Bridged Dinuclear Platinum(II) Complex: [Pt2(terpyridine)2(μ-N,N-diethyldithiocarbamato)](PF6)3
Authors: Akiba Masaharu , Umakoshi Keisuke , Sasaki Yoichi
Published: March 2006

Singly bridged dinuclear platinum(II) complex, [Pt2(trpy)2(μ-dtc)](PF6)3 (trpy = 2,2′:6′,2″-terpyridine, dtc = N,N-diethyldithiocarbamate), was synthesized and structurally characterized. The compound is luminescent in the glassy solution of propylene carbonate.
Chain Compounds Formed by the Reaction of Copper(II) Carboxylate [Cu2(O2CR)4] (R = C(CH3)3, CCl3) and Bridging Ligand L (L = Pyrazine, 4,4′-Bipyridine, and 1,4-Diazabicyclo[2.2.2]octane)
Authors: Mikuriya Masahiro , Nukada Ryoji , Morishita Hiroaki , Handa Makoto
Published: March 2006

Reaction of copper(II) carboxylates, Cu2(O2CR)4 (R = C(CH3)3 and CCl3) with bridging ligands, L (L = pyrazine (pyz), 4,4′-bipyridine (4,4′-bpy), and 1,4-diazabicyclo[2.2.2]octane (dabco)) gave compounds, [Cu2(O2CC(CH3)3)4L]n (L = pyz (1), 4,4′-bpy (2), and dabco (3)), [Cu2(O2CCCl3)4L2]·nH2O (L = pyz; n = 1 (4), L = 4,4′-bpy; n = 1 (5), and L = dabco; n = 3 (6)), and [Cu4(OCH3)4(O2CCCl3)4(CH3OH)2(pyz)]n·2nCH3OH (7). The X-ray structure analyses of 1 and 7 show chain structures where the carboxylate dimer units or the cubane tetranuclear units are linked by the pyrazine molecules.
Selenienoquinonoid-Extended Analogues of TTF, EDT-TTF, and BEDT-TTF. New Donors and Their Conductive Complexes
Authors: Takahashi Kazuko , Tomitani Kensuke , Ise Toshihiro , Shirahata Takashi
Published: March 2006

2,5-Bis(1,3-dithiol-2-ylidene)-2,5-dihydroselenophene (BDTS) and its ethylenedithio (EDT-BDTS) and bis(ethylenedithio) (BEDT-BDTS) derivatives, novel extended donors with a central selenium atom, have been synthesized by convenient methods. Of these, EDT-BDTS and BEDT-BDTS having outer chalcogen atoms afforded highly conducting molecular complexes with TCNQ (σ = 13 Scm−1 on a compressed pellet).
Synthesis of a New Chitin Derivative, (1-Carboxyethyl)chitosan
Authors: Shigemasa Yoshihiro , Ishida Atsushi , Sashiwa Hitoshi , Saimoto Hiroyuki , Okamoto Yoshiharu , Minami Saburo , Matsuhashi Akira
Published: March 2006

A new chitin derivative, (1-carboxyethyl)chitosan, was synthesized from chitin and chitosan by the reaction with 2-chloropropionic acid, and its activation effect on canine polymorphonuclear cells (PMNs) was evaluated. The degree of substitution was increased by the repetition of the reaction, but the simultaneous N-deacetylation proceeded. N-Selective 1-carboxyethylation of chitosan was achieved by reductive N-alkylation with 2-oxopropionic acid and NaBH4.
Preferential Coordination of Mercury(II) Chloride to Ethereal Oxygens over Sulfurs in 23-Di-cyanomethylene-5,8,11,14,17-pentaoxa-2,20-dithiabicyclo[19.4.1]hexacosa-1(26),21,24-triene and 20-Dicyanomethylene-5,8,11,14,-tetraoxa-2,17-dithiabicyclo[16.4.1]tricosa-1(23),18,21-triene
Authors: Kubo Kanji , Mori Akira , Kato Nobuo , Takeshita Hitoshi
Published: March 2006

23-Dicyanomethylene-5,8,11,14,17-pentaoxa-2,20-dithiabicyclo[19.4.1]hexacosa-1(26),21,24-triene and HgCl2 formed a 1:1-complex in which Hg(II) was surrounded by only the five donor oxygens in a pentagonal bipyramidal coordination; the two sulfurs in the crown ring were free from the coordination. Analogously, in the HgCl2 complex of a lower homologue, 20-dicyanomethylene-5,8,11,14-tetraoxa-2,17-dithiabicyclo[16.4.1]tricosa-1(23),18,21-triene, four oxygen and one sulfur atoms were involved in the complexation, but one sulfur atom was free.
Preparation of a 1,8-Anthracene-linked Manganese(IV) Porphyrin Dimer and Its Reduction with H2O2. The O2 Evolution Stage by the Reduction of the Mn(IV)2 Complex Is Not a Rate-determining Step in the Catalytic Disproportionation of H2O2
Authors: Sasayama Masa-aki , Naruta Yoshinori
Published: March 2006

The reduction rate of 1,8-anthracene-linked Mn(IV) porphyrin dimer with H2O2 was photometrically determined. This process is 6.5 times faster than that of the overall O2-evolution rate in the catalytic disproportionation of H2O2 with the Mn(III) porphyrin dimer and the formation of the corresponding Mn(IV)2 complex is the rate-determining step in this catalytic reaction.
Infrared Chemiluminescence Study of Excited CO2 Produced by Molecular-Beam CO Oxidation on Pt(111)
Authors: Uetsuka Hiroshi , Watanabe Koji , Kunimori Kimio
Published: March 2006

The infrared emission spectra of CO2 molecules produced by CO oxidation on Pt(111) single crystal surface have for the first time been measured by molecular-beam/infrared chemiluminescence technique. The CO2 molecules were vibrationally excited (especially, antisymmetric stretch mode) compared with those desorbed from a polycrystalline Pt foil. This is the first information on the internal energy distribution from the steady state surface reaction on a well-defined single crystal surface.
Ferromagnetism in Organic Radical Crystal of 4-(p-Chlorobenzylideneamino)-2,2,6,6-tetramethylpiperidin-1-oxyl
Authors: Nogami Takashi , Ishida Takayuki , Tsuboi Hidenori , Yoshikawa Hajime , Yamamoto Hajime , Yasui Masanori , Iwasaki Fujiko , Iwamura Hiizu , Takeda Naoya , Ishikawa Masayasu
Published: March 2006

The magnetic measurements of the polycrystalline sample of the title radical exhibited a ferromagnetic phase transition at about 0.4 K. The relationship between the magnetic properties and crystal structures for derivatives possessing H, Br, or Ph in place of Cl is discussed. A possible mechanism of the ferromagnetic couplings was proposed.
A New Class of Stable Enol Based on the 2,2,6,6-Tetramethylheptane-3,5-diol Framework
Authors: Salter Matthew M , Suzuki Ichiro , Yamamoto Yoshinori
Published: March 2006

The enol content of 3-[(p-trifluoromethylphenyl)oxy]-2,2,6,6-tetramethyl-5-heptyl 3-oxobutanoate 3c in CDCl3 at room temperature is about 98%, although that of ordinary 3-oxobutanoates such as ethyl acetoacetate is around 10%.
Photoelectrochemical Responses of Gold Electrodes Co-modified with Sulfur-Containing Ruthenium Tris(2,2′-bipyridine) and Viologen Derivatives
Authors: Yamada Sunao , Kohrogi Hidehiro , Matsuo Taku
Published: March 2006

Gold electrodes co-modified with a sulfur-containing ruthenium tris(2,2′-bipyridine) homologue (RuS) and/or a viologen derivative (SC3V), and hexadecylmercaptane (C16SH) were prepared. In the presence of triethanolamine, the RuS-SC3V-C16SH modified electrode gave a larger anodic photocurrent than the RuS-C16SH modified one. The photocurrent was ascribed to RuS-sensitized redox cycles with SC3V as the mediator.
Novel Ferroelectric Liquid Crystals Derived from Trifluoromethylated Pyranoses Showing Very Large Spontaneous Polarization
Authors: Itoh Keizou , Takeda Mitsunori , Namekawa Masaaki , Nayuki Shinichi , Murayama Yoshinobu , Yamazaki Takashi , Kitazume Tomoya
Published: March 2006

Novel ferroelectric liquid crystals with a trifluoromethylated pyranose were synthesized and their mesomorphic properties were investigated. These compounds exhibited a chiral smectic C phase and showed very large spontaneous polarization over 700 nC·cm−2. Relationships between molecular structures and physical properties were discussed.
Reduction of Imines to Amines through Use of the Cp2MoH2 and Protonic Acid System
Authors: Minato Makoto , Fujiwara Yutaka , Ito Takashi
Published: March 2006

Imines are conveniently reduced to the corresponding amines by molybdenum dihydride Cp2MoH2 under mild conditions in good yields. In the presence of a ketone only an imine was reduced and the ketone was recovered quantitatively.
Correlation between Detrapped Valence States and Molecular Packing of Mixed-Valence Dinuclear Iron(II,III) Complexes of a Septadentate Polypyridine Ligand
Authors: Maeda Yonezo , Kawano Kota , Takashima Yoshimasa
Published: March 2006

Dinuclear iron(II,III) complexes with dicarboxylic acid [Fe2L(B)] (BF4)2 were prepared, where HL represents 2,6-bis[di(2-pyridylmethyl)aminomethyl]-4-methyl-phenol, H2B is dicarboxylic acid (HOOC(CH2)nCOOH). Rapid electron interexchange between iron(II) and iron(III) are observed for the complexes with n = 6 or n = 12.