bluuebunny/crossref_metadata_2025 huggingface dataset:
NEUROKININ α AND β, SYNTHESIS AND PHARMACOLOGICAL PROPERTIES
Authors: Munekata Eisuke , Okada Masahiro , Kimura Sadao , Sugita Yoshiki , Kanazawa Ichiro , Matsudo Takayuki , Otsuka Masanori
Published: July 2006

Two novel neuropeptides, neurokinin α and β, isolated from porcine spinal cord were chemically synthesized by solution method. The amino acid sequences proposed were confirmed to be correct and pharmacological properties of neurokinin peptides were studied.
THE SYNTHESIS OF REGIO- AND STEREOSPECIFICALLY SUBSTITUTED 1,4-DIENES OR CONJUGATED ENYNES FROM INTERNAL ALKENYLDIALKYLBORANES
Authors: Hoshi Masayuki , Masuda Yuzuru , Nunokawa Yutaka , Arase Akira
Published: July 2006

Internal alkenyldialkylboranes give regio- and stereospecifically designed 1,4-dienes or conjugated enynes, bearing a substituent at the internal alkenyl carbon atom, by a coupling reaction with allyl bromide or 1-bromo-1-alkynes.
ELECTROCHEMICAL REDUCTIVE COUPLING OF ALLYL AND BENZYL HALIDES IN THE PRESENCE OF Cu(acac)2
Authors: Tokuda Masao , Satoh Kuniaki , Suginome Hiroshi
Published: July 2006

The electroreduction of allyl and benzyl bromides takes place at a reduction potential less negative than that of the bromides to give coupling products with enhanced yields if Cu(acac)2 is added to the solution, while the yields of the couplings of allyl- and benzyl chlorides and allyl iodide are unaffected by the addition of Cu(acac)2.
SYNTHESIS OF 2,4-DIACETYL-6-C-β-d-GLUCOPYRANOSYLPHLOROGLUCINOL
Authors: Obara Heitaro , Hattori Masahiko , Matsui Yuzo
Published: July 2006

2,4-Diacetyl-6-C-β-d-glucopyranosylphloroglucinol was directly obtained by the glucosylation of 2,4-diacetylphloroglucinol with 2,3,4,6-tetra-O-acetyl-α-d-glucopyranosyl bromide in the presence of sodium in methanol.
AN IMPROVED ROUTE TO (+)-9(O)-METHANO-Δ6(9α)-PROSTAGLANDIN-I1 (ISOCARBACYCLIN)
Authors: Torisawa Yasuhiro , Okabe Hiromitsu , Shibasaki Masakatsu , Ikegami Shiro
Published: July 2006

An improved synthesis of the title compound and a synthesis of its derivatives are described, in which the regiospecific transformation of the diene into the diol was effectively achieved by using thexylborane.
NIOBIC ACID AS AN EFFICIENT CATALYST FOR VAPOR PHASE ESTERIFICATION OF ETHYL ALCOHOL WITH ACETIC ACID
Authors: Chen Zai-hu , Iizuka Tokio , Tanabe Kozo
Published: July 2006

The niobic acids calcined at moderate temperatures of 120–300 °C showed high catalytic activities (52–75% conv. in 1 h) and selectivities (100%) for the esterification at reaction temperatures of 120–160 °C. No catalyst deactivation was observed even after the use for 60 h. The niobic acid catalysts were more effective than cation exchange resin, SiO2–Al2O3, HZSM-5, and solid super acids such as ZrO2–SO42−, TiO2–SO42−, and Fe2O3–SO42−.
BILAYER FORMATION FROM SINGLE-CHAIN AMMONIUM AMPHIPHILES DUE TO MULTIPLE HYDROGEN BONDING
Authors: Kunitake Toyoki , Yamada Norihiro , Fukunaga Nobuto
Published: July 2006

Stable bilayer assemblies were spontaneously formed in water from single-chain, alkylammonium surfactants which possess multiple hydrogen bonding capacities. The specific component interaction in the bilayer matrix was inferred from the DSC study.
NMR DETECTION OF A HIGHLY CONDUCTIVE PHASE IN A COMPOSITE SOLID ELECTROLYTE LiBr·H2O–Al2O3
Authors: Asai Takeshi , Kawai Shichio
Published: July 2006

Occurrence of a highly conductive phase was confirmed by a 7Li NMR study in a composite solid electrolyte LiBr·H2O–Al2O3. Thickness of an interfacial layer on a dispersed alumina particle was estimated to be 0.2 μm for 3LiBr·H2O–2Al2O3. Changes of the relative intensity in an X-ray diffraction pattern were pointed out.
ENONE FORMATION FROM ALLYL β-KETO ESTERS, ALKENYL ALLYL CARBONATES, SILYL ENOL ETHERS, AND ENOL ACETATES BY THE PHOSPHINE-FREE PALLADIUM CATALYST
Authors: Tsuji Jiro , Minami Ichiro , Shimizu Isao , Kataoka Hideaki
Published: July 2006

The effect of phosphine ligands on the palladium catalyzed enone formation from allyl β-keto esters, alkenyl allyl carbonates, silyl enol ethers, and enol acetates has been reinvestigated, and clean enone formation was observed by a phosphine-free palladium catalyst.
REACTION OF A DIPHOSPHENE WITH BUTYLLITHIUM
Authors: Yoshifuji Masaaki , Shibayama Katsuhiro , Inamoto Naoki
Published: July 2006

1,2-Bis(2,4,6-tri-t-butylphenyl)diphosphene reacted with butyllithium to give 1-alkyl-2 -butyl-1,2 -bis(2,4,6-tri-t-butylphenyl)diphosphanes after quenching with various alkyl halides, sulfurization of which afforded diphosphane monosulfides.
HARD-SOFT AFFINITY INVERSION: DEHALOGENATION OF α-HALOKETONES
Authors: Fuji Kaoru , Node Manabu , Kawabata Takeo , Fujimoto Mayumi
Published: July 2006

Treatment of α-bromo and α-iodoketones with aluminum chloride and ethanethiol gave rise to dithioacetals of the corresponding dehalogenated ketones. α-Chloro and α-fluoroketones were also dehalogenated with the same reagent system through in situ hard-soft affinity inversion.
ESTER ENOLATE CLAISEN REARRANGEMENT OF 2-BUTENYL 3-HYDROXYBUTANOATE
Authors: Fujisawa Tamotsu , Tajima Kazuhisa , Ito Masamichi , Sato Toshio
Published: July 2006

The ester enolate Claisen rearrangement of (E)- or (Z)-2-butenyl 3-hydroxybutanoate was found to give predominantly each one of four isomers of 3-methyl-4-methoxycarbonyl-5-hydroxy-1-hexene by the selection of the reaction conditions via the enolate dianions or silyl ketene acetals.
ROTATIONAL DISTRIBUTION OF CN FRAGMENT PRODUCED BY THE 266 nm PHOTOLYSIS OF ICN IN A SUPERSONIC FREE JET
Authors: Suzuki Toshinori , Ebata Takayuki , Anezaki Yoshikazu , Mikami Naohiko , Ito Mitsuo
Published: July 2006

Rotational distributions of CN(X2Σ+, v″=0) generated by the 266.0 nm photolysis of ICN in a supersonic free jet have been determined by the measurements of the fluorescence excitation spectrum. The distributions are expressed as the sum of three Boltzmann distributions characterized by temperatures of 12, 230, and 2000 K.
COPPER(II)-CATALYZED TRANSAMINATION OF HYDROPHOBIC PYRIDOXAMINE WITH PYRUVIC ACID IN BILAYER MEMBRANE: PHASE TRANSITION EFFECT
Authors: Murakami Yukito , Kikuchi Jun-ichi , Akiyoshi Kazunari
Published: July 2006

The gel–liquid-crystalline phase transition effect on the copper(II)-catalyzed transamination of 2-methyl-3-hydroxy-4-aminomethyl-5-[(N,N-dihexadecylamino)methyl]pyridine with sodium pyruvate was investigated in single-walled bilayer vesicles of N,N-dihexadecyl-Nα-[6-(trimethylammonio)hexanoyl]-l-alaninamide bromide.
TOTAL SYNTHESIS OF SWAINSONINE
Authors: Yasuda Nobuyoshi , Tsutsumi Hideo , Takaya Takao
Published: July 2006

Swainsonine, a potential immunoregulator, was synthesized from d-mannose via an intermediate, methyl 4,8-imino-2,3-O-isopropylidene-4,6,7,8-tetradeoxy-α-d-manno-octopyranoside.
PALLADIUM OR RUTHENIUM CATALYZED REACTION OF α-HALO KETONES WITH TRIBUTYLTIN ENOLATES: PREPARATION OF UNSYMMETRICAL 1,4-DIKETONES
Authors: Kosugi Masanori , Takano Izumi , Sakurai Motoi , Sano Hiroshi , Migita Toshihiko
Published: July 2006

Palladium or ruthenium catalyzed cross-coupling of α-halo ketones with tributyltin enolates gave unsymmetrical 1,4-diketones, The method was applied to the dihydrojasmone synthesis.
pH-RESPONSIVE PERMEATION OF BILAYER-COATED CAPSULE MEMBRANES BY AMBIENT pH CHANGES
Authors: Okahata Yoshio , Seki Takahiro
Published: July 2006

Nylon capsule membranes coated with synthetic bilayers containing an dissociative, cationic head group (2C16-gly-NH3+) were prepared. Permeation through the membrane of a fluorescent probe trapped in the inner aqeous phase was reversibly controlled by pH changes of the outer medium. This pH-sensitive permeation occured only at the temperature above Tc of coating bilayers, but not below their Tc.
GENERATION AND DIELS–ALDER REACTION OF 1-SILOXY-3-ARYLISOBENZOFURANS FROM 3-ARYLPHTHALIDES
Authors: Iwao Masatomo , Inoue Hisao , Kuraishi Tsukasa
Published: July 2006

1-t-Butyldimethylsiloxy-3-arylisobenzofurans, a new type of isobenzofurans, were generated from 3-arylphthalides by sequential treatment with LDA and TBDMSCl. The isobenzofurans, thus formed, were intercepted in situ by dimethyl fumarate to give stable Diels–Alder adducts in good yields. These adducts were converted into 4-aryl-1-naphthols by acid treatment. This new route for the preparation of naphthols was applied to the synthesis of natural arylnaphthalide lignan, diphyllin.
ELEMENTAL ANALYSIS OF ZEOLITES BY INDUCTIVELY COUPLED PLASMA EMISSION SPECTROSCOPY VIA DIRECT INJECTION
Authors: Mackey J R , Murphy W J
Published: July 2006

A method is described for determining the elemental analyses of zeolites in which the elements are determined as ratios of the aluminum content. This method is accurate, significantly faster and allows more rapid repeat analyses (enabling statistical significance of data to be defined) than any other technique currently available. The zeolite in a suspension of xylene is injected directly into the ICPES argon plasma and the metal ratios are measured simultaneously. This technique allows a sample turnaround time of ≈15 min with a repeat analysis every 2 min.
DSC STUDY OF POLYMORPHIC TRANSITIONS OF Dl-2-AMINOBUTYRIC ACID AND Dl-NORLEUCINE
Authors: Matsumoto Masayuki , Kunihisa Kazuko S
Published: July 2006

The polymorphic transitions in Dl-2-Aminobutyric acid and Dl-norleucine were studied by differential scanning calorimetry(DSC). The experimental results show that the α-form of Dl-norleucine is converted into a new γ-form at 390 K which is not the β-form or the superlattice deduced by Mathieson(Acta Crystallogr., 6, 399 (1953)) from crystal structures of α-and β-Dl-methionine, and that the value of transition heat is about 5 kJ mol−1, and is of the same order compared with that of the B-A transition in Dl-2-Aminobutyric acid.
EFFECT OF PREPARATION VARIABLES ON MORPHOLOGICAL AND CATALYTIC PROPERTIES OF PRECIPITATED NICKEL-SILICA CATALYSTS
Authors: Nitta Yuriko , Utsumi Teruo , Imanaka Toshinobu , Teranishi Shiichiro
Published: July 2006

Composition of the precursors and its effect on the crystallinity of Ni–SiO2 catalysts were studied using thermal gravimetry and X-ray diffraction measurement. The severer preparation conditions led to the lower proportion of NiCO3 in the precursor. The mean crystallite size of Ni in H2-reduced catalysts, and hence the activity and enantioselecivity of modified catalysts, were found to depend on the proportion of NiCO3.
DIANIONS OF N-MONOSUBSTITUTED-3-(PHENYLSULFONYL)PROPANAMIDES. CONVENIENT REAGENTS FOR THE SYNTHESIS OF 5-ALKYL-2(5H)-FURANONES
Authors: Tanaka Kazuhiko , Wakita Hisanori , Yoda Hidemi , Kaji Aritsune
Published: July 2006

Treatment of N-phenyl-3-(phenylsulfonyl)propanamide with 2 equiv. of butyllithium at −78 °C afforded the dianion. Aldehydes and ketones upon treatment with the dianion provided stable γ-hydroxy amides, which were converted in good yields to 5-alkyl-2(5H)-furanones. Optically active (R)- and (S)-5-octyl-2(5H)-furanones, and (R)- and (S)-5-tridecyl-2 (5H)-furanones were prepared from aldehydes and the dianions, derived from chiral N-monosubstituted-3-(phenylsulfonyl)propanamides.
A MILD REDUCTION OF ARENESULFONIC ACID AND ITS DERIVATIVES WITH DIPHOSPHORUS TETRAIODIDE
Authors: Suzuki Hitomi , Tani Hiroyuki , Osuka Atsuhiro
Published: July 2006

When treated with diphosphorus tetraiodide in boiling acetonitrile or under neat conditions, arenesulfonic acids, their salts, chlorides, esters, and amides are reduced to aryl disulfides in good to moderate yields.
HIGHLY ENANTIOSELECTIVE ALDOL REACTION OF METHYL KETONES VIA CHIRAL STANNOUS AZAENOLATES
Authors: Narasaka Koichi , Miwa Tetsuo , Hayashi Hiroki , Ohta Masako
Published: July 2006

Chiral 1,3-oxazolidines are readily prepared from methyl ketones and chiral norephedrine. Formation of stannous azaenolates from the oxazolidines and reaction with aldehydes followed by removal of the chiral auxiliary lead to the aldol products in high level of enantiomeric purity.
CONFORMATIONAL CHANGES IN SOLID FILMS AMONG α-HELICES WITH DIFFERENT HELIX SENSES AND π-HELIX FOR COPOLYMERS OF POLY (ASPARTATE ESTERS) WITH BENZYL AND (m-PHENYLAZO)BENZYL SIDE CHAINS
Authors: Ueno Akihiko , Morikawa Yasushi , Anzai Jun-ichi , Osa Tetsuo
Published: July 2006

Copolymers of β-(m-phenylazo)benzyl L-aspartate and β-benzyl L-aspartate exist as left-handed α-helix (αL), right-handed α-helix (αR) or π-helix (πL) in solid films at 25 °C. Conformational transitions from αL to πL and from αR to πL were found to occur by heating.
EMARKABLE ABILITY OF TETRAHYDROFLUORANTHENE IN THE LIQUEFACTION OF A SUB-BITUMINOUS COAL AT UNUSUALLY HIGH TEMPERATURE UNDER A MODERATE PRESSURE
Authors: Mochida Isao , Otani Kazumasa , Korai Yozo
Published: July 2006

An Australian sub-bituminous coal was effectively liquefied under high temperature short contact time conditions at about 30 kg/cm2 using 1,2,3,3a-tetrahydrofluoranthene (4HFL) as the solvent. The yields of the oil and asphaltene, the target products, were as high as 54 and 16%, respectively, for a reaction at 560 °C with zero contact time. 4HFL was principally converted into fluoranthene together with some undefined four ring aromatic compounds. The efficacy of the present liquefaction procedures is introduced.
CRYSTALLOGRAPHIC PROPERTIES OF LnCoO3(Ln = La–Eu) PEROVSKITE IN A HYDROGEN ATMOSPHERE
Authors: Arakawa Tsuyoshi , Ohara Nobuhiko , Shiokawa Jiro
Published: July 2006

The crystallographic properties of LnCoO3 under a hydrogen atmosphere were determined by X-ray diffraction and the thermograv-imetric analysis which were carried out to pursue in situ the reaction of reduction of LnCoO3. It was shown that the reduction process proceeded through the formation of a series of oxygen-deficient structures in keeping the perovskite structure.
AMINATED POLYSTYRENE-BOUND Rh CLUSTER CATALYSTS FOR THE WATER GAS SHIFT REACTION
Authors: Kaneda Kiyotomi , Kobayashi Masaya , Imanaka Toshinobu , Teranishi Shiichiro
Published: July 2006

Various aminated polystyrenes are synthesized by treatment of chloromethylated polystyrene with amines. The aminated polymers are examined as an insoluble support for Rh6(CO)16 in the water gas shift reaction (WGSR). Diethylenetriamino polymer is the most effective support for the WGSR. This heterogenization does not lower the WGSR activity in homogeneous systems.
PORTULIDE, A CLERODANE DITERPENOID FROM PORTULACA GRANDIFLORA HOOK
Authors: Ohsaki Ayumi , Matsumoto Keishi , Shibata Kozo , Tokoroyama Takashi , Miura Iwao
Published: July 2006

A clerodane diterpene, portulide has been isolated firstly from Portulaca grandiflora Hook and the structure also been elucidated on the basis of spectral evidences and chemical correlation.
STUDY ON THE SIZE DISTRIBUTION OF IRON PARTICLES DISPERSED IN SiO2 SUPPORT
Authors: Tanabe Syuji , Ida Takasi , Suginaga Masao , Ueno Akifumi , Kotera Yoshihide , Tohji Kazuyuki , Udagawa Yasuo
Published: July 2006

A new method to control the size of iron particles in Fe/SiO2 catalyst was studied. The catalyst was prepared by drying and then calcining a gel obtained by hydrolysis of the mixed solution of ethyl silicate and iron(III) nitrate dissolved in ethylene glycol. Iron particles were deposited in a controlled size level by reducing the calcined catalyst in a hydrogen stream. EXAFS and IR spectroscopies were employed to see the reason why the size of iron particles was controlled in the catalyst thus prepared.
A NOVEL ROUTE TO 5-FLUOROURACILS FROM CHLOROTRIFLUOROETHENE
Authors: Fuchikami Takamasa , Yamanouchi Akiko , Suzuki Yasuyuki
Published: July 2006

Diethyl fluoromalonate was prepared in one-pot from chlorotrifluoroethene via trifluoroacrylic acid lithium salt in 79% yield. Diethyl fluoromalonate was easily converted to 5-fluoro-6-chlorouracils, reductions of which gave 5-fluorouracils in good yields.
REACTIONS OF CHLOROMETHYL PHENYL SULFONE CARBANION WITH NITROBENZOPHENONES. THE VICARIOUS SUBSTITUTION OF HYDROGEN Versus THE DARZENS CONDENSATION
Authors: Makosza Mieczyslaw , Golinski Jerzy , Baran Janusz , Dziewonska-Baran Danuta
Published: July 2006

Carbanion of chloromethyl phenyl sulfone replaces hydrogen atoms o′- and p- to the nitro group in o-nitrobenzophenone, whereas with p-nitrobenzophenone it enters the Darzens condensation followed by rearrangement and decarbonylation. Reaction course with m-nitrobenzophenone depends on the conditions (base concetration). When an excess of a base is present the vicarious substitution of hydrogen takes place whereas low concentration of a base favours the Darzens condensation.
NUCLEOPHILIC FORMYLATION OF NITROARENES VIA VICARIOUS SUBSTITUTION OF HYDROGEN WITH TRISPHENYLTHIOMETHANE
Authors: Makosza Mieczyslaw , Winiarski Jerzy
Published: July 2006

Carbanion of phenyl trithioorthoformate reacts with nitroarenes according to the vicarious substitution scheme replacing hydrogen in the para position to the nitro group. The reaction offers a new method of nucleophilic formylation of nitroarenes.
HYDROXYLATION REACTION OF AROMATIC RINGS IN AQUEOUS SOLUTION INDUCED BY HYDROGEN–OXYGEN FLAME
Authors: Takasaki Michiaki , Nomoto Shinya , Harada Kaoru
Published: July 2006

It was found that direct hydroxylation of aromatic rings proceeded in aqueous solution of phenyl-containing amino acids by using hydrogen–oxygen flame and that the active species of the reaction could be considered as hydroxyl radicals generated in the burning flame.
CRYSTAL STRUCTURES OF HEPTAKIS(2,6-DI-O-METHYL)-β-CYCLODEXTRIN COMPLEXES WITH p-IODOPHENOL AND p-NITROPHENOL
Authors: Harata Kazuaki
Published: July 2006

Crystal structures of heptakis (2,6-di-O-methyl)-β-cyclodextrin (dimethyl-β-CDx) complexes with p-iodophenol and p-nitrophenol were determined by the X-ray method. The dimethy1-β-CDx molecule is in the round shape, which is maintained by the intramolecular hydrogen bonds formed between adjacent 2,6-di-O-methylglucose residues. The guest molecules in both complexes are not included within the host cavity, but located in intermolecular spaces between dimethyl-β-CDx molecules. The host cavity includes three water molecules and a methoxyl group of adjacent dimethyl-β-CDx.
CRYSTAL STRUCTURE OF (BMDT-TTF)3ClO4(1,2-DICHLOROETHANE). MOLECULAR DESIGN FOR THE MULTI-DIMENSIONAL MOLECULAR CONDUCTOR
Authors: Kato Reizo , Kobayashi Hayao , Kobayashi Akiko , Sasaki Yukiyoshi
Published: July 2006

In the crystal of (BMDT-TTF)3ClO4(1,2-dichloroethane), inclined BMDT-TTF (bis(methylenedithio)TTF) molecules with dihedral angles of 57–58° construct the two-dimensional S···S network parallel to the ac plane. The steric and electronic features of BMDT-TTF suggest that BMDT-TTF will take a wide variety of the molecular arrangement which lead to the multi-dimensional molecular conductors.
BINDING BEHAVIOR OF ANTITUMOR R,R-1,2-CYCLOHEXANEDIAMINE PLATINUM(II) WITH OLIGONUCLEOTIDES AND DNA
Authors: Inagaki Kenji , Kasuya Kyoko , Kidani Yoshinori
Published: July 2006

Platinum modified oligonucleotides (5′-d(CpCpGpG)-3′ and 5′-d(GpGpCpC)-3′) and DNA were digested by endo- and exo-nuclease and the products digested were identified by means of HPLC. R,R-1,2-Cyclohexanedlamlne platinum(II) complex selectively binds to guanine residues to form intrastrand crosslink between two adjacent guanine bases through N(7)–N(7) sites.
DIRECT PHOTOLYSIS AT 185 nm OF 1-ALKENES IN SOLUTION. MOLECULAR ELIMINATION OF TERMINAL HYDROGENS
Authors: Inoue Yoshihisa , Mukai Toshio , Hakushi Tadao
Published: July 2006

Direct irradiations at 185 nm of 1-octene and 2-methyl-1-pentene in pentane gave alkylidene carbenes through the molecular elimination of terminal hydrogens, as well as double-bond migration products via 1,3-shift of allylic hydrogen and radical-derived products.
TRITYL PERCHLORATE AS AN EFFICIENT CATALYST IN THE ALDOL-TYPE REACTION
Authors: Mukaiyama Teruaki , Kobayashi Shu , Murakami Masahiro
Published: July 2006

In the presence of a catalytic amount of trityl perchlorate, silyl enol ethers and ketene silyl acetals react with acetals and methyl orthoformate to give the corresponding aldol-type addition products in good yields.
STEREOCONTROLLED TOTAL SYNTHESIS OF (+)-ASTEROMURIN A, A PICROTOXANE SESQUITERPENE ISOLATED FROM THE SCALE INSECT ASTEROCOCCUS MURATAE KUWANA
Authors: Wakamatsu Kazumasa , Niiyama Kenji , Niwa Haruki , Yamada Kiyoyuki
Published: July 2006

The first total synthesis of (+)-asteromurin A, a picrotoxane sesquiterpene isolated from the scale insect Asterococcus muratae KUWANA is described.
PROPENE OLIGOMERIZATION OVER TiO2–ZrO2 CATALYSTS
Authors: Espinoza Rafael L , Scurrell Michael S , Walsem Hendrik J Van
Published: July 2006

Titania–zirconia mixed oxides may be prepared in high specific area form, and with or without nickel are active as catalysts for the oligomerization of propene. The presence of nickel favors the formation of oligomers containing more than ten carbon atoms per molecule.
NEW SYNTHETIC METHOD OF (Z)-4-ALKENOIC ACIDS USING RING-OPENING REACTION OF (Z)-4-HEXENOLIDE WITH ORGANOCOPPER REAGENT
Authors: Fujisawa Tamotsu , Umezu Kazuto , Kawashima Masatoshi
Published: July 2006

(Z)-4-Hexenolide reacted regioselectively with diorganocuprates to give (Z)-4-alkenoic acids in high yields. Synthetic utility was demonstrated by the convenient synthesis of cis-jasmone.
KINETIC STUDIES ON THE HIGH-PRESSURE DIELS–ALDER REACTION OF TROPONE WITH MALEIC ANHYDRIDE
Authors: Takeshita Hitoshi , Sugiyama Shigeru , Hatsui Toshihide
Published: July 2006

The rates and activation parameters of the (4+2)π cycloaddition of tropone with maleic anhydride were measured in the range of 105–135 °C at pressures up to 2000 bar in cumene and in DMF. The values of activation volume and the volume change of reaction revealed a deviation to a great extent from those of (6+4)π process of tropone with cyclopentadiene, but to a small extent from the other (4+2)π process.
POLYMER-SUPPORTED QUATERNARY AMMONIUM CYANIDES AND THEIR USE AS CATALYSTS IN THE BENZOIN CONDENSATION
Authors: Castells Josep , Duñach Elisabet
Published: July 2006

Polymer-supported quaternary ammonium cyanides, active as catalysts in the benzoin condensation, were prepared by using a Merrifield resin as starting material. Participation of the ammonium counter-ion in the transition state of the benzoin condensation is shown by the optical activity of benzoin when a chiral ammonium cyanide is used as the catalyst.
STRUCTURE OF GÜIMAREDIOL, A NEW REARRANGED SESQUITERPENOID FROM THE RED ALGA LAUBENCIA SP.
Authors: Gonzalez Antonio G , Martin Julio D , Martin Victor S , Perez Ricardo , Drexler Steven A , Clardy Jon
Published: July 2006

The structure of güimarediol, a new brominated tricyclic sesquiterpene with a new rearranged isoprenoid skeleton isolated from the red seaweed Laurencia sp., was determined by spectroscopic methods and X-ray crystallography.
MERCURY(II)-ADSORPTIVITY OF LIQUID POLYBUTADIENE-INORGANIC SUPPORT SYSTEM
Authors: Ikeda Isao , Shibata Yukio , Kishimoto Yoshihisa , Okahara Mitsuo
Published: July 2006

The liquid polybutadiene-silica gel system revealed the good adsorptivity toword mercury(II) in water, and the concentration of mercury(II) was reduced from 380 ppm to 0.3 ppm by shaking with this adsorption system in a batch process.
DETERMINATION OF CHEMICALLY BOUND OXYGEN BY 15O-O TRACER METHOD. APPLICATION TO HEMOGLOBIN- AND SYNTHETIC HEME-BOUND OXYGEN
Authors: Yuasa Makoto , Ogata Yoshitaka , Nishide Hiroyuki , Tsuchida Eishun , Iwamoto Masako , Nozaki Tadashi
Published: July 2006

Oxygen-15 radiotracer method was applied to the determination of chemically bound oxygen. Volume of oxygen bound with red blood cell suspension or with synthetic heme was evaluated within an error of ca. ±5%.
SYNTHESIS OF OPTICALLY ACTIVE PSEUDO-α-d-GLUCOSE AND PSEUDO-β-l-ALTROSE
Authors: Suami Tetsuo , Tadano Kin-ichi , Kameda Yukiaki , Iimura Youichi
Published: July 2006

Optically active two pseudo-sugars, pseudo-α-d-glucose and pseudo-β-l-altrose have been synthesized by cyclization of 2,3,4-tri-O-benzyl-5-deoxy-5-iodo-l-arabinose with dimethyl malonate in the presence of sodium hydride as a key reaction.
A FACILE ENTRY TO 3-(1-HYDROXYETHYL)-2-AZETIDINONES FROM METHYL (R)-3-HYDROXYBUTANOATE BASED ON THE ESTER ENOLATE-ALDIMINE CONDENSATION
Authors: Chiba Toshiyuki , Nagatsuma Masako , Nakai Takeshi
Published: July 2006

The reaction of the dianion of methyl (R)-3-hydroxybutanoate with the N-silylimine generated from trimethylsilylpropynal afforded (3R,4S)-3-[(R)-1-hydroxyethyl]-4-trimethylsilylethynyl-2-azetidinone as the major product, of which the stereochemistry was assigned through its stereospecific conversion to the (+)-4-acetoxy derivative.
REACTION OF PROPARGYL BROMIDE AND TRIMETHYLSILYLPROPARGYL IODIDE WITH METALLIC TIN, ALUMINUM, AND ALDEHYDES OR KETONES. SELECTIVE SYNTHESIS OF β-ACETYLENE, β-TRIMETHYLSILYLACETYLENE, AND α-TRIMETHYLSILYLALLENE ALCOHOLS
Authors: Nokami Junzo , Tamaoka Takashi , Koguchi Tadao , Okawara Rokuro
Published: July 2006

β-Acetylenic and α-allenic alcohols were synthesized selectively by the reaction of aldehydes and ketones with organotin compounds prepared by treatment of propargyl bromide or trimethylsilylpropargyl iodide with metallic tin and aluminum in a suitable solvent.
DOUBLY-CHELATED CYCLOPALLADATED COMPLEXES OF 1,3-BIS(2-PYRIDYL)PROPANE
Authors: Hiraki Katsuma , Fuchtta Yoshio , Matsumoto Yasuhiro
Published: July 2006

1,3-Bis(2-pyridyl)propane reacted with palladium(II) acetate in acetic acid at 100 °C, resulting in the formation of a brown oil. The oil was treated with lithium chloride to give a doubly-chelated cyclopalladated complex, [Pd{(C5H4N)CH2CHCH2(C5H4N)}Cl].
ELECTRODE REACTIONS OF THIOCYANATOPENTACYANOCOBALTATE(III) COMPLEX
Authors: Maki Nobufumi , Kato Takashi
Published: July 2006

It has been difficult to judge decisively whether the [CoII(CN)5]3−/[CoI(CN)5]4− system is nernstian or not, since the [CoI(CN)5]4− ion extracts a proton from water to dimerize itself into an electroinactive dimeric species, [{CoI(CN)5}2H]7−. The present study affirmed that a completely reversible electrode reaction of the Co(II)/Co(I) couple proceeds in 100% dimethyl sulfoxide. The standard electrode potential of the [CoII(CN)5]3−/[CoI(CN)5]4− couple was −1.272 V vs. NHE at (25±0.1) °C (ΔG°=+122.7 kJ mol−1).
TRIALKYLBORANE-INDUCED CHLORINATIONS OF ALKANE WITH CHLORINE, t-BUTYL HYPOCHLORITE AND N-CHLOROSUCCINIMIDE
Authors: Hoshi Masayuki , Masuda Yuzuru , Arase Akira
Published: July 2006

Trialkylboranes initiated the chlorinations of alkanes with radical chlorinating agents such as chlorine, t-butyl hypochlorite and N-chlorosuccinimide. The reactions proceeded at 20 °C even in the dark giving monochloroalkanes.
PHOTOCYCLOBUTENOLIZATION OF 2,4,6-TRIISOPROPYLBENZOPHENONE AND ITS DERIVATIVES STUDIED BY PICO- AND NANOSECOND SPECTROSCOPY
Authors: Nakayama Toshihiro , Hidaka Toshiharu , Kuramoto Tetsunobu , Hamanoue Kumao , Teranishi Hiroshi , Ito Yoshikatsu , Matsuura Teruo
Published: July 2006

By pico- and nanosecond spectroscopy methods, the transient absorption spectra and lifetimes of the triplet states of 2,4,6-triisopropylbenzophenones, the 1,4-biradicals and the dienols were measured. The decays of the T′←T1 absorptions were accompanied by the rate matching increase in the absorptions -of the biradicals.
A NOVEL SYNTHESIS OF DIALKYL KETONES AND α-SULFENYLATED CARBONYL COMPOUNDS FROM α,β-EPOXY SULFOXIDES
Authors: Satoh Tsuyoshi , Kaneko Youhei , Kumagawa Takumi , Izawa Takao , Sakata Kiichi , Yamakawa Koji
Published: July 2006

Treatment of α,β-epoxy sulfoxides with excess sodium phenylselenide and various kinds of alkylthiolates gave dialkyl ketones and α-sulfenylated carbonyl compounds, respectively, in good yields under mild conditions.
CATALYTIC ASSAY OF l-LACTATE OR PYRUVATE WITH AN ENZYME ELECTRODE BASED ON IMMOBILIZED LACTATE OXIDASE AND LACTATE DEHYDROGENASE
Authors: Mizutani Fumio , Shimura Yukio , Tsuda Keishiro
Published: July 2006

An enzyme electrode using immobilized lactate oxidase and lactate dehydrogenase is prepared for the catalytic assay of l-lactate or pyruvate: the rate of the circulating enzymatic reactions between l-lactate and pyruvate is monitored by an oxygen electrode. Either of the substrates is determined in the concentration range 0.08–8 μM.
ACID-CATALYZED CYCLIZATION OF OCTADIENYNE DERIVATIVES. FACILE FORMATION OF CYCLOPENTADIENE, ISOBENZOTHIOPHENE, AND 18-MEMBERED CYCLIC ETHER
Authors: Iyoda Masahiko , Tanaka Shigeyoshi , Aso Yoshio , Nakagawa Masazumi
Published: July 2006

Treatment of substituted octa-2,6-dien-4-yne-1,8-dial derivatives with CF3COOH gave cyclopentadiene, thiophene, or isobenzothiophene derivatives. Formation of an 18-membered cyclic ether was observed in the case of octa-2,7-dien-4-yne-1,6-diol derivative.
NICKEL CATALYZED LOW TEMPERATURE GASIFICATION OF GRAPHITE BY CARBON DIOXIDE
Authors: Yamada Tetsuo , Suzuki Tsutomu , Homma Tsuneyuki
Published: July 2006

Gasification of various graphites mechanically mixed with nickel catalysts by carbon dioxide was carried out in a thermobalance at temperatures up to 1000 °C. It was observed that some graphites gave large weight loss in the low temperature region of 500–750 °C. The weight loss in this region were increased with increase of the catalyst loading until graphite was completely gasified.
A STEADY STATE APPROXIMATION OF POPULATION DENSITY DISTRIBUTIONS OF ARGON ATOMS IN AN INDUCTIVELY COUPLED PLASMA AS AN EXCITATION SOURCE FOR ATOMIC SPECTROMETRY
Authors: Hasegawa Tetsuya , Fuwa Keiichiro , Haraguchi Hiroki
Published: July 2006

The population density distributions of argon atoms in an inductively coupled plasma (ICP) are calculated based on the collisional-radiative model under a steady state approximation. The results obtained help to interpret the physical states of the argon plasma and to elucidate the characteristics of the ICP as an excitation source for spectrochemical analysis.
PHYSICOCHEMICAL PROPERTIES OF 3,6-DI-t-BUTYL-1,4-DIHYDROPYRROLO[3,2-b]PYRROLE AND ITS N-METHOXYCARBONYL DERIVATIVES
Authors: Satake Kyosuke , Kumagai Tsutomu , Mukai Toshio
Published: July 2006

3,6-Di-t-butyl-1,4-dihydropyrrolo[3,2-b]pyrroles and its N-methoxycarbonyl derivatives were synthesized and their IR, NMR, and UV spectra as well as the oxidation potentials were measured. On the basis of these data, aromaticity and basicity of this novel 10π-aromatic system 1,4-dihydropyrrolo [3,2-b]pyrrole were discussed.
A NEW POLYMORPH OF METAL-FREE PHTHALOCYANINE
Authors: Takano Shigemasa , Enokida Toshio , Kakuta Atsushi , Mori Yasuki
Published: July 2006

The spectroscopic characterization of a novel polymorph of metal-free phthalocyanine(τ-form), showing the particular X-ray diffraction peaks, was investigated by comparing the other polymorphs. In this paper, the precise ir spectrum obtained by FTIR and visible absorption spectrum of the τ-form are reported.
A CONVENIENT SYNTHESIS OF N-BROMOAMIDES BY USE OF SODIUM BROMITE
Authors: Kajigaeshi Shoji , Nakagawa Takashi , Fujisaki Shizuo
Published: July 2006

Reaction of aliphatic and aromatic amides in acetic acid with aqueous sodium bromite (NaBrO2) under mild conditions gave N-bromoamides in fairly good yields.
A FACILE METHOD FOR THE STEREOSELECTIVE PREPARATION OF ACYCLIC syn-1,3-AMINO ALCOHOLS FROM β-HYDROXY KETONES
Authors: Narasaka Koichi , Yamazaki Shigeru , Ukaji Yutaka
Published: July 2006

Treatment of acyclic β-hydroxy ketones with O-benzylhydroxylamine hydrochloride gave a mixture of stereoisomers of the corresponding O-benzyloximes. The mixture of the both isomers was reduced with lithium aluminum hydride in the presence of sodium or potassium methoxide to afford syn-1,3-amino alcohols in a highly stereoselective manner.
PHOTOCHEMICAL REACTIONS OF NAPHTHALENEDICARBOXIMIDES. EFFECT OF ARENE STRUCTURE IN IMIDE COMPOUNDS ON REACTION WITH OLEFINS
Authors: Kubo Yasuo , Tojo Sachiko , Suto Manami , Toda Rie , Araki Takeo
Published: July 2006

Photolyses of N-methylnapathalenedicarboximides (1,8-NI, 2,3-NI, and 1,2-NI) with various olefins were investigated in benzene. The reaction pathways depended largely on the structure of arene moiety of the imides. The main reactions of 1,8-NI, 2,3-NI, and 1,2-NI were found as cyclobutane formation, oxetane formation, and insertion of olefin between the C(=O)–N bond of imide moiety, respectively.
COMPLEX FORMATION OF CYCLODEXTRINS IN ALCOHOL SOLUTIONS
Authors: Harada Akira , Takahashi Shigetoshi
Published: July 2006

β-Cyclodextrin(β-CD) was found to form inclusion complexes in ethylene glycol, diethylene glycol, triethylene glycol, 2-methoxyethanol, 2-ethoxyethanol, methanol, and glycerine solutions. γ-CD also formed complexes in ethylene glycol solution. The binding of ferrocene by β-CD is stronger in ethylene glycol than in dimethyl sulfoxide and dimethyl formamide.
PHOTOCHEMICAL C–P BOND CLEAVAGE OF (p-NITOROPHENYL)METHYLPHOSPHONIC ACID
Authors: Okamoto Yoshiki , Iwamoto Narimasa , Takamuku Setsuo
Published: July 2006

(p-Nitrophenyl)methylphosphonic acid underwent easily photochemical C–P bond cleavage in alkaline 80% ethanol solution, resulting in the formation of p-nitrotoluene, orthophosphate, and ethyl phophate. In acidic solution, the phosphonic acid was stable on irradiation.
SYNTHESIS AND UNAMBIGUOUS CHARACTERIZATION OF OPTICALLY PURE (+)-4-DEMETHOXYADRIAMYCIN HYDROCHLORIDE
Authors: Kimura Yoshikazu , Suzuki Michiyo , Terashima Shiro
Published: July 2006

The title compound showing mp 226–229 °C(decomp) and [α]D20 +190°(CH3OH) was synthesized by two different synthetic routes and fully characterized by its spectral properties. These studies suggested that the compound previously claimed to be 4-demethoxyadriamycin hydrochloride, mp 186–188 °C(decomp), might be (+)-14-formyloxy-4-demethoxydaunorubicin hydrochloride.
COPPER SITE OF NITRITE REDUCTASE FROM ALCALIGENES SP. STRUCTURAL EVIDENCE FROM X-RAY ABSORPTION SPECTROSCOPY
Authors: Sano Mitsuru , Matubara Teruo
Published: July 2006

The EXAFS study has been carried out for the copper site of nitrite reductase from Alcaligenes sp. The curve-fitting results showed that the copper site has N2S with Cu–N=1.97 and Cu–S=2.17 Å.
A MILD CYCLIZATION OF 2-AMINOALCOHOLS TO AZIRIDINES USING DIPHOSPHORUS TETRAIODIDE
Authors: Suzuki Hitomi , Tani Hiroyuki
Published: July 2006

The reaction of 2-aminoalcohols with diphosphorus tetraiodide in benzene at room temperature leads to the corresponding aziridines in good to moderate yields.
A CONVENIENT SYNTHESIS OF γ-ACYL- AND RELATED δ-LACTONES
Authors: Kato Michiharu , Saito Hiroaki , Yoshikoshi Akira
Published: July 2006

γ-Acyl- and related δ-lactones having no 6 substituents were synthesized in a sequence of reactions, 1,4-conjugate additions of sulfurstabilized acetate anions to α,β-unsaturated ketones, followed by trapping of the resultant ketone enolates with formaldehyde, mild lactonization, and desulfurization.
PREPARATION AND CHARACTERIZATION OF AN OCTOPUS AZAPARACYCLOPHANE AS A HOST FOR VARIOUS HYDROPHOBIC GUEST MOLECULES
Authors: Mirakami Yukito , Kikuchi Jun-ichi , Suzuki Masashi , Takaki Toshihiko
Published: July 2006

An octopus azaparacyclophane bearing eight hydrophobic chains, N,N′,N″,N'″-tetrakis[2-[N-[1-(N,N-ditetradecylcarbamoyl)-5-ammonio-1-pentyl]carbamoyl]ethyl]-3,10,21,28-tetraoxo-2,11,20,29-tetraaza[3.3.3.3]paracyclophane tetrachloride [APC(C2Lys2C14)4], was prepared and its substrate-binding behavior was examined in comparison with that of related azaparacyclophanes.
NONSELECTIVE DISPROPORTIONATION OF ISOMERIC HYDROXYCYCLOHEXADIENYL RADICALS TO PHENOLS
Authors: Tezuka Takahiro , Marusawa Hiroshi , Ichikawa Kazuhiko
Published: July 2006

Comparison of the isomer ratios and yields of cresol, methoxyphenol, and nitrophenol, which were obtained by the aromatic hydroxylation with hydroxyl radical in the presence or absence of benzoquinones in anhydrous media, indicates that disproportionation of hydroxycyclohexadienyl radicals occurs nonselectively.
THE CHIRAL SYNTHESIS OF BICYCLOMYCIN
Authors: Yoshimura Juji , Yamaura Masanori , Suzuki Tsuneji , Hashimoto Hironobu
Published: July 2006

The optically active bicyclomycin was successfully synthesized in 17 steps from N,N′-diacetyl-anhydroglycine.
REMARKABLE CATALYTIC ACTIVITY OF THERMALLY MODIFIED CoTPP SUPPORTED ON TiO2 FOR NO-CO REACTION
Authors: Mochida Isao , Iwai Yasuo , Fujitsu Hiroshi
Published: July 2006

CoTPP supported on fine TiO2-120s pretreated by the evacuation at 250 °C exhibited a remarkable activity, 2.2 mol NO/mol Co.min, for the reduction of NO with CO at 100 °C. The pretreatment modified the structures of CoTPP to be insoluble in benzene but still soluble in quinoline. Such an activity is assumed to originate from the thermally-modified CoTPP of dimeric form with major loss of phenyl groups interacting more favorably with the properly dehydrated support.
DYNAMIC TRANSFORMATION OF THE MORPHOLOGY OF DIALKYLAMMONIUM BILAYER AGGREGATES
Authors: Nakashima Naotoshi , Asakuma Sumitoshi , Kunitake Toyoki , Hotani Hirokazu
Published: July 2006

Optical and electron microscopies showed dynamic morphological changes of the aqueous bilayer aggregate of dialkylammonium salts among large vesicles, fibers and small vesicles.
HIGHLY ENANTIOSPECIFIC AND ERYTHRO-SELECTIVE [2,3]-WITTIG REARRANGEMENT OF ENANTIOMERICALLY-ENRICHED ALLYLIC BENZYL ETHERS. A NEW, FORMAL CHIRAL SYNTHESIS OF l-EPHEDRINE
Authors: Sayo Noboru , Kitahara Ei-ichiro , Nakai Takeshi
Published: July 2006

The [2,3]-Wittig rearrangement of chiral (Z)-allylic benzyl ethers provides 94–97% of asymmetric transfer (enantiospecificity), along with 90–96% of erythroselectivity. Its synthetic potential is illustrated through the stereocontrolled synthesis of an optically-active precursor of l-ephedrine.
ISOLATION AND IDENTIFICATION OF THE MALE SEX PHEROMONE OF THE GRAPE BORER XYLOTRECHUS PYRRHODERUS BATES (COLEOPTERA: CERAMBYCI DAE)
Authors: Sakai Tsutomu , Nakagawa Yoshiko , Takahashi Jiro , Iwabuchi Kikuo , Ishii Kenji
Published: July 2006

The sex pheromone of grape borer, Xylotrechus pyrrhoderus Bates, was isolated from body extracts and container washings of male insects, and was determined to be a mixture of (2S,3S)-octanediol (1) and (2S)-hydroxy-3-octanone (2). Each compound showed special response in electroantennogram experiments. The females were attracted by 80:20 to 95:5 mixtures of 1 and 2. This is the first time that the male sex pheromone from Cerambycidae species has been isolated and determined.
PHOTOOXIDATION OF MONOSACCHARIDES WITH METAL CATALYSIS. OXIDATION WITH ATMOSPHERIC OXYGEN BY COUPLING WITH THE OXIDATION-REDUCTION CYCLE OF METAL IONS
Authors: Araki Koji , Shiraishi Shinsaku
Published: July 2006

d-Fructose was oxidatively degraded to d-erythrose by atmospheric oxygen with irradiation of a Pyrex-filtered light in the presence of catalytic amount of FeCl3 at near neutral pH range. The reaction proceeded by coupling with the oxidation-reduction cycle of iron ion. d-Glucose-FeCl3 and d-fructose-MnCl2 systems were also found to be susceptible to the catalytic photooxidation.
INTRAMOLECULAR 1,3-DIPOLAR CYCLOADDITIONS TO A FURAN RING
Authors: Tsuge Otohiko , Ueno Kazunori , Kanemasa Shuji
Published: July 2006

1,3-Dipolar systems derived from o-(2-furylmethyloxy)benzaldehyde undergo an intramolecular cycloaddition to the furan ring, giving the corresponding cycloadducts; this provides the first example for the intramolecular 1,3-dipolar cycloaddition to a furan ring.
23Na CHEMICAL SHIFTS OF SOME INORGANIC AND ORGANIC COMPOUNDS IN THE SOLID STATE AS DETERMINED BY THE MAGIC ANGLE SPINNING AND HIGH POWER NMR METHODS
Authors: Tabeta Ryoko , Saito Hazime
Published: July 2006

23Na chemical shifts and linewidths of some inorganic and organic salts were examined by magic angle spinning and high power NMR methods. We found that 23Na linewidths are considerably narrowed when magic angle spinning was employed. Displacements of 23Na chemical shifts were also discussed.
OXIDATION OF COORDINATED DITHIOCARBAMATE AND 2-PYRIDINETHIOLATE; SYNTHESIS AND CHARACTERIZATION OF [Co(N,N-DIMETHYLAMINOTHIOXO-METHANESULFINATO-S,O)(en)2]2+ AND [Co(2-PYRIDINESULFENATO-S,N OR-O-N)(en)2]2+ COMPLEXES
Authors: Kita Masakazu , Yamanari Kazuaki , Shimura Yoichi
Published: July 2006

The H2O2 oxidation of [Co(N,N-dimethyldithiocarbamato-S,S′)(en)2]2+ and [Co(2-pyridinethiolato-S,N(en)2]2+ in acid media gave the novel complexes [Co (N,N-dimethylaminothioxomethanesulfinato-S,O)(en)2]2+ and [Co(2-pyridinesulfenato-S,N)(en)2]2+, respectively. The latter S,N-chelated isomer was photochemically converted into the O,N-chelated linkage-isomer [Co(2-pyridinesulfenato-O,N)(en)2]2+, accompanying ring-expansion from a four- to five-membered chelate ring. These complexes were characterized by the absorption, circular dichroism, and X-ray photoelectron spectra.
FACILE CONVERSION OF 1,3-DISUBSTITUTED THIOUREAS TO THE CORRESPONDING UREAS BY SUPEROXIDE RADICAL ANION (O2·−) IN DIMETHYL SULFOXIDE
Authors: Kim Yong Hae , Yon Gyu Hwan , Kim Hyung Jin
Published: July 2006

Treatment of 1,3-disubstituted thioureas with superoxide radical anion (O2·−) at 20 °C in dimethyl sulfoxide resulted in the formation of 1,3-disubstituted ureas in excellent yields. The desulfurization appears to proceed by the formation of peroxy-sulfur intermediates such as peroxy-sulfenate, -sulfinate and/or -sulfonate.
PHOTOELECTRON SPECTRA OF DIARYLDIPHOSPHENES
Authors: Gleiter Rolf , Friedrich Gert , Yoshifuji Masaaki , Shibayama Katsuhiro , Inamoto Naoki
Published: July 2006

The He(I) photoelectron (PE) spectra of bis(2,4,6-tri-t-butylphenyl)diphosphene and mesityl(2,4,6-tri-t-butylphenyl)diphosphene are reported. An interpretation based on semiempirical calculations and comparison with other data is suggested.
CRYSTAL STRUCTURE OF HOFMANN-DMA-TYPE BENZENE CLATHRATE BIS(DIMETHYLAMINE)CADMIUM(II) TETRACYANONICKELATE(II)-BENZENE (2/1)
Authors: Nishikiori Shin-ichi , Iwamoto Toschitake
Published: July 2006

The title clathrate Cd(NH(CH3)2)2Ni(CN)4·\frac12C6H6 has a layered host structure of metal complex network [CdNi(CN)4]∞ linked by the CN ligands and the benzene molecule is enclathrated in a cage-like cavity formed between the layers. The channel-like cavity, observed along with the cage-like one for the Hofmann-dma-type toluidine clathrates, is collapsed owing to the fold of the layers to minimize void space.
ON THE PECULIAR REACTIVITIES OF N(5)-HYDROGEN-BONDED FLAVIN. A MODEL APPROACH TO FLAVIN ACTIVATION THROUGH HYDROGEN-BONDING
Authors: Shinkai Seiji , Honda Noriaki , Ishikawa Yuichi , Manabe Osamu
Published: July 2006

A new flavin with hydrogen-bonded N(5) (OHFl: sodium 1′-hydroxybenzo[2′, 3′-h]-10-methylisoalloxazine-5′-sulfate) was synthesized. The reactivity for NADH model compounds was similar to that of 3-methyllumiflavin(MeLFl), whereas the rate constants for the reactions with thiols were enhanced by 33–645 fold. The result implies that OHF1 is “specifically” active towards thiol oxidation, the reaction involving 4a-intermediates. Thus, OHFl can mimick part of the hydrogen-bond-dependent activation mechanism of flavoproteins.
ISOLATION AND STRUCTURE OF A NEW NATURAL CYCLOHEXADIENONE DERIVATIVE, WASABIDIENONE-A, FROM POTATO CULTURE SOLUTION OF PHOMA WASABIAE YOKOGI
Authors: Soga Osamu , Iwamoto Hidetoshi , Date Satoru , Watanabe Takeshi , Tanaka Kazuhiko , Hata Kuniharu , Takuwa Akio , Nakayama Mitsuru
Published: July 2006

A yellow pigment isolated from the title solution is proposed to be a tautomeric mixture of 3-hydroxy-5-methoxy-2,6-dimethyl-6-(2-methylbutyryloxy)-2,4-cyclohexadien-1-one and 3-hydroxy-5-methoxy-2,4-dimethyl-4-(2-methylbutyryloxy)-2,5-cyclohexadien-1-one on the basis of methylation experiment which give two products corresponding to both forms.
STRUCTURE OF (6-METHYL-6-(4-AMINO-2-AZA-BUTYL)-1,4-DIAZACYCLOHEPTANE)(ETHYLENEDIAMINE)COBALT(III) PERCHLORATE AND CORRELATION BETWEEN Co–N BOND LENGTH AND POSITION OF ABSORPTION MAXIMUM IN [Co(N)6] COMPLEXES
Authors: Sakaguchi Ushio , Tomioka Kanji , Yoneda Hayami
Published: July 2006

The structure of the title compound, [Co(C9H22N4)(C2H8N2)](ClO4)3, has been determined by X-ray techniques. The correlation between the λmax values in the absorption spectra and the average Co–N lengths in [Co(N)6] complexes has been used to explain the large red-shift in the absorption spectrum of this compound.
HYDROBORATION OF ALKENES AND ALKYNES WITH SODIUM BOROHYDRIDE CATALYZED BY TITANIUM COMPLEX
Authors: Lee Hyung Soo , Isagawa Kakuzo , Otsuji Yoshio
Published: July 2006

The titanium complex prepared from Cp2TiCl2 and NaBH4 in THF in the presence of crown ethers efficiently promotes the catalytic hydroboration of alkenes and alkynes with NaBH4 to give sodium alkyl- and alkenyl-borohydrides which are converted into alcohols and alkenes, respectively.
REACTION OF N-BENZYLOXYIMINES WITH LITHIATED ALKYL CARBOXYLATES. CONVENIENT SYNTHESIS OF N-BENZYLOXY-β-LACTAMS
Authors: Ikeda Kiyoshi , Yoshinaga Yumiko , Achiwa Kazuo , Sekiya Minoru
Published: July 2006

N-Benzyloxyimines have been shown to react with lithiated carboxylic esters to give N-benzyloxy-β-lactams in moderate to good yields.
A NEW METHOD OF β-KETO ALKYL CHAIN INTRODUCTION INTO 1,4-NAPHTHOQUINONE
Authors: Maruyama Kazuhiro , Otsuki Tetsuo , Tai Seiji
Published: July 2006

Photochemical reaction of 2,3-disubstituted 1,4-naphthoquinone with 2-methoxy-1-alkene and subsequent hydrolysis afforded 2-(2-alkanonyl)-1,4-naphthoquinone derivatives.
THE MICHAEL REACTION OF SIMPLE ESTER ENOLATES TO α,β-UNSATURATED ESTERS
Authors: Yamaguchi Masahiko , Tsukamoto Michinori , Hirao Ichiro
Published: July 2006

Lithium enolates generated from simple esters are found readily to add to α,β-unsaturated esters at −78 °C and glutarates are obtained in high yield.
RHODIUM CATALYZED REDUCTION OF ARYL IODIDES WITH A MODEL OF NAD(P)H
Authors: Yasui Shinro , Nakamura Kaoru , Ohno Atsuyoshi
Published: July 2006

Aryl iodides are reduced to the corresponding arenes with a model of NAD(P)H, 1-benzyl-1,4-dihidronicotinamide (BNAH), in the presence of a catalytic amount of rhodium complex. Nitro, carbonyl, and ester functions are inert under the condition.
INFRARED STUDY ON THE C≡P STRETCHING VIBRATION OF 1-PHOSPHAPROPYNE CH3C≡P AND ITS PERDEUTERIUM ANALOG CD3C≡P
Authors: Ohno Keiichi , Yamamoto Yasumasa , Matsuura Hiroatsu , Murata Hiromu
Published: July 2006

Unstable molecule 1-phosphapropyne was detected by gas-phase infrared spectroscopy and the vibration-rotation band of the C≡P stretching was analyzed for CH3C≡P and CD3C≡P.
ACTIVATION OF COBALT(III)-ALKYL BONDS THROUGH INTERACTION WITH ORGANIC OXIDANTS AND THE CATALYTIC EFFECT OF Mg2+ ION ON ALKYL TRANSFER REACTIONS FROM cis-DIALKYLCOBALT(III) COMPLEXES TO p-BENZOQUINONE DERIVATIVES
Authors: Fukuzumi Shunichi , Ishikawa Kunio , Tanaka Toshio
Published: July 2006

Alkyl transfer reactions from cis-dialkylcobalt (III) complexes, [R2Co(bpy)2]ClO4 (R = Me and Et; bpy = 2,2′-bipyridine), to p-benzoquinone derivatives in acetonitrile occurred in the presence of Mg(ClO4)2 which showed a remarkable catalytic effect. Formation of charge-transfer complexes between [R2Co(bpy)2]+ and p-benzoquinone derivatives is also reported.
STEREOSELECTIVE HYDROLYSIS OF AMINO ACID ESTERS IN MODIFIED LINEAR POLY(ETHYLENIMINE) DOMAINS
Authors: Kimura Yoshiharu , Kanda Shinichi , Nango Mamoru , Ihara Yasuji , Koga Joichi , Kuroki Nobuhiko
Published: July 2006

A large rate enhancement and a stereoselective preference are exhibited in the hydrolysis catalysed by N-decanoyl-l-histidine(2a) and a dipeptide containing l-histidyl residue (2b) in the domain of linear poly(ethylenimine) derivatives.
AN EFFICIENT ONE-STEP REDUCTIVE N-MONOALKYLATION OF α-AMINO ACIDS
Authors: Ohfune Yasufumi , Kurokawa Natsuko , Higuchi Naoki , Saito Masayuki , Hashimoto Masaki , Tanaka Takaharu
Published: July 2006

Reactions of protection-free a-amino acids with aldehydes or ketones in the presence of sodium cyanoborohydride afforded the N-monoalkylated amino acids in inorganic salt-free form. Application of this method to the synthesis of N-alkyl derivatives of biologically important amino acids is also described.
STEREOSELECTIVE HYDROALKYLIDENATION OF OLEFIN WITH PYRIDINIUM METHYLIDES
Authors: Tsuge Otohiko , Kanemasa Shuji , Takenaka Shigeori , Kuraoka Satoru
Published: July 2006

Acid-catalyzed elimination of pyridine from the stereoselective [3+2] cycloadducts between electron-deficient olefins and pyridinium methylides with ylide-stabilizing substituents offers a new type of C–C bond formation.