bluuebunny/crossref_metadata_2025_split huggingface dataset:
Rotationally Resolved ZEKE Photoelectron Spectrum of Benzene. Dynamic Jahn-Teller Effect in the ν6(e2g) Mode
Authors: Sekiya Hiroshi , Lindner Reiner , Müller-Dethlefs Klaus 
Published: April 2006

Abstract
The rotationally resolved zero-kinetic energy spectrum of benzene has been measured for ionization into the 61 level of the electronic ground state of benzene cation. Conclusive assignments have been given for the Jahn-Teller components j = 1/2 and j = ±3/2, arising from the linear and quadratic couplings.
Proposed Mechanism for Production of Stable Aminoxyl Radical Impurities in the Synthesis of Substituted 5,5-Dimethylpyrroline-N-oxide (DMPO) Spin Traps
Authors: Janzen Edward G , Zhang Yong-Kang , Arimura Masana 
Published: April 2006

Abstract
Paramagnetic impurities in nitrone spin traps are bothering researchers in the practice of spin trapping. By use of mass spectroscopy, a hydroxylamine dimer of 2,5,5-trimethylpyrroline-N-oxide (M3PO) has been found in samples of M3PO. Air oxidation of the hydroxylamine may produce the aminoxyl radical impurity detected. Mechanisms for the generation of impurities in DMPO and derivatives are proposed.
Negative Photochromic Polymers. Synthesis and Photochemical Properties of Poly(methyl methacrylate) Having Spirobenzoselenazolinobenzopyran Side Groups
Authors: Miyashita Akira , Nakano Shinji , Hirano Masafumi , Nohira Hiroyuki 
Published: April 2006

Abstract
A series of novel negative photochromic poly(methyl methacrylate) having spirobenzoselenazolinobenzopyran side groups was newly synthesized, and their reversible photochemical color changes were studied: their metastable colorless spiro-forms induced by Vis light irradiation was stabilized more than 90 days, although that dispersed in polymer film was thermally unstable turning to the stable merocyanine-form. Kinetic study to investigate their thermocoloration process was performed.
Synthesis of Novel Electron Acceptor, 2,5-Bis[4′-(dimethylamino)pyridinio]-3,6-difluoro-7,7,8,8-tetracyanoquinodimethane Bis(trifluoromethanesulfonate), in the Form of Charge-Transfer Complex
Authors: Iwatsuki Shouji , Kubo Masataka , Iwase Hironori 
Published: April 2006

Abstract
2,5-Bis[4′-(dimethylamino)pyridinio]-3,6-difluoro-7,7,8,8-tetracyanoquinodimethane bis(trifluoromethanesulfonate) was obtained as a 1:1 charge-transfer complex with 4-(dimethylamino)pyridine in the reaction of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (TCNQF4) with N-trimethylsilyl-4-(dimethylamino)pyridinium trifluoromethanesulfonate. Its first reduction potential was measured in cyclic voltammetry to be as high as 0.96 V (vs. Ag/AgCl), exceeding that of 2,5,7,7,8,8-hexacyanoquinodimethane (TCNQ(CN)2) by 0.29 V.
Prediction of the Optimum Reaction Time for Carbon-11 Labelling Reactions. The Rate Constants for the Carboxylation of Grignard Reagents
Authors: Yamazaki Hiroyoshi , Hayashi Nobuyoshi 
Published: April 2006

Abstract
The rate constants for the carboxylation of a series of aliphatic Grignard reagents were measured as part of the development of a computer assisted automated synthesis apparatus. A good correlation was obtained between the rate constants and Taft’s Es values.
Preparation of 2-(Alkylseleno)benzothiazoles. Direct Incorporation of the Alkyl Group of Alcohols into Benzothiazolylseleno Residue
Authors: Shibata Koichi , Mitsunobu Oyo 
Published: April 2006

Abstract
Reaction of alcohols with 2-(1,2-diphenyl-2-oxoethylseleno)benzothiazole in the presence of tributylphosphine gave the corresponding 2-alkylselenobenzothiazoles, where inversion of the secondary carbinol center of the alcohols took place. 1,3-Butanediol reacted at the primary hydroxyl group, while 1-phenyl-1,2-ethanediol reacted at the secondary hydroxyl group.
Stereoselective Synthesis of β-Phenylserine from Glycine and Benzaldehyde as Mediated by Catalytic Bilayer Membranes, Artificial Vitamin B6-dependent Enzymes
Authors: Kikuchi Jun-ichi , Takashima Toru , Nakao Hidetoshi , Hie Ken-ichi , Etoh Hiroshi , Noguchi Yasuhiro , Suehiro Kazuaki , Murakami Yukito 
Published: April 2006

Abstract
The aldolation of glycine with benzaldehyde to yield β-phenylserine was catalyzed by supramolecular assemblies formed with a synthetic peptide lipid, a hydrophobic vitamin B6 derivative, and zinc(II) ions in aqueous media under mild conditions. A diastereomeric ratio of the reaction products was much dependent on a size and a phase property of the vesicular catalyst.
Synthesis of Enones and Cyclopropanes by the Reaction of Telluronium Ylides Generated from Bis(2-oxoalkyl)tellurium Dichlorides
Authors: Han Li-Biao , Kambe Nobuaki , Ryu Ilhyong , Sonoda Noboru 
Published: April 2006

Abstract
The reaction of bis(2-oxoalkyl)tellurium dichlorides (1) with a base gave either 1,4-dioxo-2-alkenes or 1,2,3-triacylcyclopropanes depending on the conditions employed. The reaction of 1 with LDA followed by the addition of an aldehyde led to the Wittig-type olefination to give E-α,β-unsaturated ketones in good yields. The cyclopropanes and 1,4-dioxo-2-alkenes could also be synthesized conveniently by a one-pot procedure from the corresponding ketones by the aid of TeCl4 and LDA.
Molecular Geometry of the Photooxygenation Product of Diphenanthro[5,4,3-abcd:5′,4′,3′-jklm]perylene
Authors: Sakai Ken-ichi , Nagashima Umpei , Fujisawa Shoji , Uchida Akira , Ohshima Shigeru , Oonishi Isao 
Published: April 2006

Abstract
The photooxygenation of diphenanthro[5,4,3-abcd:5′,4′,3′-jklm]perylene (DPP) is investigated by using semi-empirical molecular orbital methods. It was shown theoretically that molecular oxygen (O2) attaches to the central part of DPP, causing a large bend of the molecular plane. The experimental observation was reasonably explained on the basis of the calculated oscillator strengths of optically allowed transitions in DPP and photooxygenated DPP.
The First Preparation and Structures of Dibenzo[bc,fg][1,4]-diselenapentalene and -selenathiapentalene
Authors: Kimura Takeshi , Ishikawa Yasuhiro , Furukawa Naomichi 
Published: April 2006

Abstract
Dibenzodiselenapentalene and dibenzoselenathiapentalene were prepared by thermolysis of 1,9-disubstituted dibenzoselenophenes and their structures were determined by X-ray crystallographic analysis.
Tris(trimethylsilyl)silane in the Alkylation of Heteroaromatic Bases with Alkyl Halides
Authors: Togo Hideo , Hayashi Ken , Yokoyama Masataka 
Published: April 2006

Abstract
Protonated heteroaromatic bases were easily alkylated via radical pathways using alkyl halides in the presence of tris(trimethylsilyl)silane under photochemical or thermal conditions.
Enantioselective β-Replacement Reaction Mediated by an Artificial Enzyme Composed of a Hydrophobia Vitamin B6, Chiral Bilayer-forming Lipids, and Copper(II) Ions
Authors: Murakami Yukito , Hisaeda Yoshio , Miyajima Tetsuya , Sakata Hiroyuki , Kikuchi Jun-ichi 
Published: April 2006

Abstract
A hybrid bilayer membrane, composed of a synthetic lipid having an (S)-alanine residue, one having (S)-binaphthol and (S)-alanine moieties, a hydrophobic pyndoxal derivative, and copper(II) ions, exhibited a tryptophan synthase-like reactivity that affords tryptophan from serine and indole in an enantiomeric excess of the (S)-isomer.
Effect of Cold-drawing on the Carbonization of Polyimide Films
Authors: Takeichi Tsutomu , Takenoshita Hidehiro , Ogura Satoshi , Inagaki Michio 
Published: April 2006

Abstract
Kapton-type polyimide films that were cold-drawn at the stage of polyamic acids were carbonized. Electrical conductivity of the carbonized films increased proportionally with the draw ratio from 70 S/cm for the undrawn films up to almost 200 S/cm for the 70% drawn films.
Photorearrangement of Thiophenetriptycene
Authors: Ishii Akihiko , Maeda Kiyoto , Nakayama Juzo , Hoshino Masamatsu 
Published: April 2006

Abstract
Photoirradiation of 4,8-dihydro-4,8[3′,2′]thiophenobenzo[1,2-b:5,4-b′]dithiophenes (thiophenetriptycenes) results in di-π-methane rearrangement to provide the corresponding semibullvalenes. In the initial stage of the di-π-methane rearrangement, C(7a)-C(8a) bridging occurs exclusively regardless of bridgehead substituents.
Structure of Transient Cr(CO)5(phen) Studied by Time-resolved Infrared Spectroscopy
Authors: Oishi Shigero , Watanabe Masao , Muraishi Tomoyoshi 
Published: April 2006

Abstract
Cr(CO)5(phen) generated as an intermediate in the photochemical carbonyl substitution of Cr(CO)6 with 1,10-phenanthroline (phen) has been investigated by laser flash photolysis with infrared detection. Cr(CO)5(phen) was found to have a capped-octahedron type structure; five carbonyls maintained a square-pyramidal geometry and phen coordinated unusually in a monodentate fashion.
Control of a Dye Formation Reaction in a Single Micrometer-Sized Oil-Droplet by Laser Trapping and Microelectrochemical Methods
Authors: Nakatani Kiyoharu , Uchida Tatsuya , Funakura Seiji , Sekiguchi Atsushi , Misawa Hiroaki , Kitamura Noboru , Masuhara Hiroshi 
Published: April 2006

Abstract
A dye formation reaction between 4-N,N-diethyl-2-methylquinonediimine and a phenol derivative at the oil-droplet/water interface was studied by a microelectrochemical method combined with laser trapping of an individual droplet in an oil-in-water emulsion system. The reaction in a single droplet with ≈ 10 μm diameter was shown to be controlled by the distance between the droplet and a microelectrode.
One-pot Deprotection and Coupling of Peptides by the Fmoc Strategy
Authors: Ueki Masaaki , Nishigaki Naohiko , Aoki Hiroko , Tsurusaki Takeshi , Katoh Tsuyoshi 
Published: April 2006

Abstract
9-Fluorenylmethyloxycarbonyl (Fmoc) group can be quickly removed with tetrabutylammonium fluoride hydrate (TBAF·xH2O) in the presence of a large excess of phenylmethanethiol or 1-octanethiol. Subsequent oxidation of the thiol with bis(1-methyl-1H-tetrazol-5-yl) disulfide simultaneously inactivated the TBAF and enabled one-pot peptide bond elongation by the Fmoc strategy.
Optical Resolution of a d-Biotin Chiral Intermediate by Use of Lipoprotein Lipase
Authors: Tokuyama Shinji , Yamano Toru , Aoki Isao , Takanohashi Kunio , Nakahama Kazuo 
Published: April 2006

Abstract
An efficient optical resolution of (±)-(3aα,4α,6aα)-1,3-dibenzyl-3a,4,6,6a-tetrahydro-4-hydroxy-1H-thieno[3,4-d]imidazol-2(3H)-one [(RS)-1] was accomplished by acylation with lipoprotein lipase from Pseudomonas aeruginosa TE3285 in toluene. The lipase acylated (R)-1 enantioselectively, and unreacted (S)-1, which is a chiral d-biotin intermediate, was isolated in excellent chemical and optical yields (&gt;99% e.e.). Effects of acylating agents, water content and molecular sieves were also investigated.
Electron-rich Triarylbismuthines as Selective Condensation Reagent under Neutral Conditions. Condensation of Aliphatic Carboxylic Acids with Amines and Alcohols
Authors: Ogawa Takuji , Hikasa Tetsuya , Ikegami Tohru , Ono Noboru , Suzuki Hitomi 
Published: April 2006

Abstract
On heating with amines or alcohols in the presence of tris(2-methoxy phenyl)- or tris(2,6-dimethoxyphenyl)bismuthine, carboxylic acids bearing α-hydrogen are readily converted into the corresponding amides or esters in good yields while those without α-hydrogen remain intact.
Reduction of Carboxylic Acid with 2-Propanol over Zirconia-Titania
Authors: Takahashi Kyoko , Shibagaki Makoto , Kuno Hideyuki , Matsushita Hajime 
Published: April 2006

Abstract
The reduction of long carbon chain carboxylic acids or the esters with 2-propanol proceeded efficiently over zirconia-titania at atmospheric pressure, and the corresponding alcohols were obtained. Methyl 9-octadecenoate was reduced to give 9-octadecen-1-ol in a 58% yield.
New Synthesis of Macrocyclic Compounds from Tetraazapentalene Derivatives with the Hypervalent Sulfur
Authors: Matsumura Noboru , Hirase Ryuji , Mori Osamu , Inoue Hiroo 
Published: April 2006

Abstract
2,3-Bis[(p-isothiocyanatomethylphenyl)methyl]-6,7-dihydro-5H-2a-thia(2a-SIV)-2,3,4a,7a-tetraazacyclopent[cd]indene-1,4(2H,3H)-dithione, prepared from 2,3-dialkyl substituted tetraazapentalene derivatives and p-xylylene diisothiocyanate, reacted with N,N′-dialkyl substituted diamines to give macrocyclic compounds by ring closure in good yields. These macrocyclic compounds were converted into desulfurized macrocyclic compounds by treatment with NaBH4 and CF3COOH.
Effect of the Twisted Nitro Group on Gas Phase Acidities of Phenol, Toluene, Aniline, and Benzoic Acid. Steric Inhibition of Intrinsic Resonance Effect
Authors: Mishima Masaaki , Kang Chul Hyun , Huh Chul , Fujio Mizue , Tsuno Yuho 
Published: April 2006

Abstract
Gas phase acidities have been determined for 3,5-dimethyl-4-substituted phenols, toluenes, anilines, and benzole acids. The reduced effect of the 4-nitro group on acidity was observed for all series compared with that in the unhindered system, being attributed to steric inhibition of resonance effect. From this result a dihedral angle between the benzene ring and the nitro group was estimated to be 38 ± 2° for these acids.
Structural Study of ZnZr4(PO4)6 Solid Electrolyte
Authors: Nomura Katsuhiro , Ikeda Shoichiro , Masuda Hideki , Einaga Hisahiko 
Published: April 2006

Abstract
The crystal structure of ZnZr4(PO4)6, a member of β-Fe2(SO4)3-type solid electrolyte, has been determined by X-ray diffraction method. There are two disordered zinc ions in zirconium phosphate framework, which are characterized by distorted polyhedra of Zn(1)O5 and Zn(2)O5 with the occupation ratio of about 2 : 1. The ionic conduction behavior of this solid electrolyte is compared with that of NASICON-type one.
Facile Synthesis of Lactones from Silyl ω-Siloxycarboxylates Using p-Trifluoromethylbenzoic Anhydride and a Catalytic Amount of Active Lewis Acid
Authors: Mukaiyama Teruaki , Izumi Jun , Miyashita Mitsutomo , Shiina Isamu 
Published: April 2006

Abstract
The lactonization of silyl ω-siloxycarboxylates is successfully carried out under mild conditions in good to high yields by using p-trifluoromethylbenzoic anhydride and a catalytic amount of active acidic species generated in situ from TiCl4 and AgClO4.
Interaction between Metal Compounds and Dioxygen Molecule in the Presence of Aliphatic Aldehydes
Authors: Nishida Yuzo , Takahashi Shigeyuki , Watanabe Izumi 
Published: April 2006

Abstract
We have obtained the electrochemical evidence for the enhanced interaction between dioxygen molecule and the metal compounds such as manganese(II) and nickel(II) complexes in the presence of cyclohexanecarboxyaldehyde.
Substituent Effects on the Photosolvolyses of 2-Chloropropiophenones in 2,2,2-Trifluoroethaol
Authors: Usui Satoshi , Nishimoto Jyunji , Ohkubo Katsutoshi 
Published: April 2006

Abstract
The substituent effects on the product distributions of the photosolvolyses of 2-chloropropiophenones in 2,2,2-trifluoroethanol were investigated. A π-electron-donating methoxy substituent at p-and m-position enhanced the heterolytic product of the nucleophilic substitution over that of phenyl-rearrangement.
Synthesis of Sulfonated Hyaluronan Derivatives Containing Nucleic Acid Bases
Authors: Wada Takehiko , Chirachanchai Suwabun , Izawa Naoto , Inaki Yoshiaki , Takemoto Kiichi 
Published: April 2006

Abstract
The conjugation of nucleic acid base with sulfonated hyaluronan was achieved by the ring opening reaction of 1,2-O-ethano derivatives of nucleic acid bases. The conditions of sulfonation of sodium hyaluronate were studied. Thymine and 5-bromouracil base were quantitatively conjugated to sulfonated hyaluronan in 15% and 24%, respectively.
Effects of Additive Salts on Electrochemical Characteristics of Neutral Carrier Based Electrodes
Authors: Wakida Shin-ichi , Hayano Kensou , Shibutani Yasuhiko , Yakabe Kenji , Shono Toshiyuki , Yoshikawa Susumu , Higashi Kunishige 
Published: April 2006

Abstract
Remarkable effects of such additive salts as tetraphenylborate derivatives on low detection limit and slope sensitivity were found in electrochemical characteristics of sodium-selective neutral carrier based electrodes by using bis(12-crown-4).
Regioselective Synthesis of Prenylisoflavones. Syntheses of 2,3-Dehydrokievitone and Related Compounds
Authors: Tsukayama Masao , Tsurumoto Ken , Kishimoto Kazuto , Higuchi Daisuke 
Published: April 2006

Abstract
The palladium-catalyzed coupling reaction of 2′,4′,5,7-tetrakis(benzyloxy)-8-iodoisoflavone with 2-methyl-3-butyn-2-ol gave the corresponding 8-(3-hydroxy-3-methylbutynyl)isoflavone 8. Dehydration of the benzoate obtained from 8 in two steps gave a mixture of 8-prenylisoflavone 10 and its regioisomer [8-(3-methyl-3-butenyl)isoflavone]. Treatment of the mixture with aq. Hg(NO3)2 allowed the isolation of 10, which was hydrolyzed to give 2,3-dehydrokievitone. Similarly, 2,3-dehydrokievitone tetramethyl ether was also synthesized from 8-iodo-2′,4′,5,7-tetramethoxyisoflavone.
Synthesis of a Potential Heparanase Inhibitor
Authors: Takahashi Shunya , Kuzuhara Hiroyoshi 
Published: April 2006

Abstract
Aza-analog of the basic disaccharide unit in heparan sulfate was designed as a potential inhibitor against heparanase produced by solid tumor cells, and synthesized via a coupling reaction of a phenyl 2-azido-1-thio-d-glucopyranoside derivative with a partially protected 1-deoxynojirymycin derived from d-glucose, followed by manipulation such as imino acid formation, O-sulfation.
Synthesis and Structural Characterization of a Unique Octanuclear Bismuth(III) Thiosalicylate Complex with a Disk-like Cluster Core
Authors: Asato Eiji , Katsura Kosho , Arakaki Takahiro , Mikuriya Masahiro , Kotera Takanori 
Published: April 2006

Abstract
The octanuclear bismuth(III) thiosalicylate complex, [Bi8(tsal)12(DMF)6](DMF)6 (H2tsal = thiosalicylic acid, DMF = N,N′-dimethylformamide), has been prepared and structurally characterized. The single crystal X-ray structure analysis has demonstrated that the eight Bi atoms form a disk-like cluster core and that each lone pair of two Bi atoms as the asymmetric unit is stereochemically activated.
Generation, ESR Spectra, and Isolation of N-(Arylthio)-4-t-butyl-2,6-diphenylphenylaminyl Radicals
Authors: Miura Yozo , Fuchikami Tomohiro , Momoki Masayoshi 
Published: April 2006

Abstract
Oxidation of N-(arylthio)-4-t-butyl-2,6-diphenylanilines yields quite persistent and oxygen-insensitive N-(arylthio)-4-t-butyl-2,6-diphenylphenylaminyls which, in solution, give a characteristic blue, purple, or wine-red color. Among the aminyls generated, N-(4-nitrophenylthio)-4-t-butyl-2,6-diphenylphenylaminyl is isolated as radical crystals. The ESR spectra are split into a simple 1 : 1 : 1 triplet by the interaction with a nitrogen nucleus. Upon deuteration of the phenyl groups at the 2 and 6 positions of the anilino group, the 1 : 1 : 1 triplets are split further by the interaction with the meta protons of the anilino group and the ortho protons of the arylthio group. The spin density distribution in the radical is discussed on the basis of the hyperfine coupling constants.
Proximately Assisted and Chemoselectively Cleavable Protecting Groups for Alcohols, 2-[2-(Arylmethyloxy)ethyl]benzoic Esters
Authors: Watanabe Yutaka , Ishimaru Masanori , Ozaki Shoichiro 
Published: April 2006

Abstract
Alcohols were protected by esterification with new protecting reagents, 2-[2-(arylmethyloxy)ethyl]benzoic acids and the esters were chemoselectively deprotected in a proximately assisted manner even in the presence of acetyl, levulinyl, and silyl groups.
Zinc-Diethylaluminium Chloride Induced Coupling Reaction of Dibromofluoroacetate with Carbonyl Compounds. New Efficient and Selective Synthesis of α-Bromo-α-fluoro-β-hydroxy and α-Fluoro-β,β′-dihydroxy Esters
Authors: Ishihara Takashi , Matsuda Takayuki , Imura Katsunori , Matsui Hirofumi , Yamanaka Hiroki 
Published: April 2006

Abstract
Treatment of ethyl dibromofluoroacetate with aldehydes or ketone in the presence of zinc and diethylaluminium chloride at −20 °C gave rise to the corresponding α-bromo-α-fluoro-β-hydroxy alkanoic acid ethyl esters in good yields, while the use of two equivalents each of aldehyde, zinc, and diethylaluminium chloride in the reaction resulted in a double coupling reaction affording the 1 : 2 adducts, α-fluoro-β,β′-dihydroxy esters in high yields.
Steric Control of Redox Potentials of Cobalt(II) Schiff Base Complexes with Phenyl Substituents
Authors: Hirotsu Masakazu , Kojima Masaaki , Nakajima Kiyohiko , Kashino Setsuo , Yoshikawa Yuzo 
Published: April 2006

Abstract
The structure of the cobalt(II) complex of the tetradentate Schiff base ligand derived from 2-hydroxybenzophenone and rac-1,2-diphenylethylenediamine was determined by the X-ray method to show that the phenyl groups in the N-N chelate moiety are in axial positions. The redox potential of the cobalt(II/III) couple in CH3CN for the complex is shifted in a more positive direction by ca. 300 mV than that for [CoII(salen)]. The significant anodic shift is ascribed to the steric effect of the axial phenyl groups.
Chiral Discrimination in Exciplex Quenching of 2,2′-Dimethyl-1,1′-bianthryl-N,N-Dimethylaniline System
Authors: Nishiyama Toshinori , Mizuno Kazuhiko , Otsuji Yoshio , Inoue Hiroo 
Published: April 2006

Abstract
Emission associated with exciplex between (R)-(−)- or (S)-(+)-2,2′-dimethyl-1,1-bianthryl (R-(−)-1 or S-(+)-1) and N,N-dimethylaniline (DMA) was quenched by (+) and (−)-menthyl cinnamates at room temperature. The chiral exciplexes were discriminated by the two enantiomeric quenchers that interact with the exciplexes in an enantioselective manner.
Synthesis of Sterically Overcrowded Deca- and Undecaphenylporphyrins via Mixed Condensation of 3,4-Diphenylpyrrole with Benzaldehyde and Formaldehyde
Authors: Takeda Jun , Sato Mitsuo 
Published: April 2006

Abstract
Sterically overcrowded unsymmetrical porphyrins bearing ten and eleven phenyl groups are synthesized using mixed condensation of diphenylpyrrole with benzaldehyde and formaldehyde and characterized by FAB-MS, UV-VIS, and NMR spectra.
Determination of the Structure of [1-13C]Glycine-[15N]Alanine Double Labeled Bombyx mori Silk Fibroin Fibers Using Solid State 15N NMR
Authors: Asakura Tetsuo , Demura Makoto , Hiraishi Yoshiaki , Ogawa Katsuaki , Uyama Atsuo 
Published: April 2006

Abstract
The 13C-15N dipolar splitting was observed for the oriented [1-13C]glycine-[15N]alanine Bombyx mori silk fibroin rods placed parallel to the magnetic field with 15N solid state NMR spectroscopy. The isotope labeled and oriented silk fibroin samples were prepared by the cultivation of the middle silkgland from the silkworm. The angle between the 13C-15N peptide bond of the glycine-alanine sequence and the oriented axis was determined as 141° from the coupling constant.
Formation of σ-(Acyl)cobalt(III) Porphyrins by the Reaction of Cobalt(II) Porphyrins with Aldehydes in the Coexistence of NaBH4 and t-BuOOH
Authors: Setsune Jun-ichiro , Watanabe Jun-ya 
Published: April 2006

Abstract
Cobalt(II) porphyrins reacted with various aldehydes in the presence of NaBH4 and t-BuOOH to form σ-(acyl)cobalt(III) porphyrins in good yields. When t-BuOOH was replaced by molecular oxygen in the reaction with propanal, σ-(1-formylethyl)cobalt(III) porphyrin and its oxygenated byproduct, σ-(1-formylethoxy)cobalt(III) porphyrin, were obtained predominantly.
Hydrothermal Synthesis and Characterization of Lead Titanate Powder
Authors: Kikuta Ko-ichi , Tosa Akifumi , Yogo Toshinobu , Hirano Shin-ichi 
Published: April 2006

Abstract
Lead titanate fine powders were synthesized by the hydrothermal method without using alkali mineralizers such as KOH. Preparation conditions influenced strongly the resultant phases, morphologies, and compositions of the lead titanate powders. Some observations on the prepared lead titanate were also carried out by the transmission electron microscopy and ζ-potential measurement.