bluuebunny/crossref_metadata_2025 huggingface dataset:
PHOTOINDUCED REACTIONS. LXXII. REACTIVITY OF SINGLET OXYGEN TOWARD CYCLIC OLEFINS
Authors: Matsuura Teruo , Horinaka Akio , Nakashima Ruka
Published: July 2006

The relative reactivities of various cyclic olefins toward singlet oxygen generated by photosensitized oxygenation were determined. The differences in reactivity are mainly rationalized in term of the conformational requirements of olefins for the concerted “ene” mechanism.
CHLORINATION OF TRANS-1,4-DICHLORO-2-BUTENE
Authors: Shinoda Kiyonori
Published: July 2006

The chlorination of trans-1,4-dichloro-2-butene (tr-DCB-2) in chlorinated hydrocarbon solvents yielded solid and liquid isomers. When methylene chloride (I) was used as a solvent, the solid isomer was obtained in high yield. The ionic pathway dominated in I and was an exclusive trans-addition process.
MAGNETIC PROPERTIES OF MOLTEN CHLORIDE SYSTEMS MnCl2–KCl, CoCl2–KCl AND NiCl2–KCl
Authors: Tanemoto Kei , Nakamura Tetsuro , Sata Toshiyuki
Published: July 2006

Magnetic susceptibilities of chloride systems containing paramagnetic ions Mn2+(3d5), Co2+(3d7) and Ni2+(3d8) were measured with increasing temperatures from their solid states to molten states. The susceptibility of each system obeyed the Curie–Weiss law in the both states and jumped at the melting temperature. The magnetic moments increased on melting in the systems of Co2+ and Ni2+ (L≠0).
ELECTRON TRANSFER FROM AMINES TO LIQUID SULFUR DIOXIDE
Authors: Nagai Toshikazu , Katayama Kaoru , Tokura Niichiro
Published: July 2006

Epr spectra were obtained from solutions of amines in liq·SO2 due to the radical cations of the amines which might be the first observation of the electron transfer from organic molecules to liq·SO2.
CHEMICAL CLEAVAGE OF PEPTIDE BOND AT TRYPTOPHAN RESIDUE : AN IMPROVED METHOD
Authors: Sakiyama Fumio , Masuda Nobuhito
Published: July 2006

An improved method for selective chemical cleavage of the tryptophyl bond according to a principle proposed previously is described. By the present method, tryptophyl bonds in several synthetic oligopeptides were cleaved nearly quantitatively.
EFFECT OF SALT ON THE CONFORMATION OF GEL-FORMING β-1,3-d-GLUCAN IN ALKALINE SOLUTION
Authors: Ogawa Kozo , Tsurugi Jitsuo , Watanabe Takehiko
Published: July 2006

Effect of sodium chloride on the conformation of a gel-forming β-1,3-d-glucan in sodium hydroxide solution was studied. The increase of the salt concentration causes the conformational transition of the glucan from a random coil to an ordered structure when the alkaline concentration is below 0.3 N.
THE REACTION OF TRIALKYLBORANES WITH THE (α-LITHIO DERIVATIVES OF BIS(PHENYLTHIO)METHANE AND OF 1,1-BIS(PHENYLTHIO)PENTANE. A CONVENIENT METHOD FOR THE PREPARATION OF ALDEHYDES AND KETONES
Authors: Yamamoto Shoji , Shiono Manzo , Mukaiyama Teruaki
Published: July 2006

It was found that various aldehydes and ketones were readily prepared in good yields by the reactions of α-lithio derivatives of thioacetals with trialkylboranes.
PYRROLIZIDINE ALKALOIDS. THE TOTAL SYNTHESIS OF RETUSAMINIC ACID
Authors: Kiyooka Syun’ichi , Hase Tsunao , Edwards J D
Published: July 2006

(±)-Retusaminic acid has been synthesized from diethyl 1-methylacetonylmalonate and resolved by means of cinchonidine. The synthesized enantiomer was shown to be identical with natural retusaminic acid.
TIME-RESOLVED PHOSPHORESCENCE SPECTRA OF EDA COMPLEXES OF AROMATIC CARBONYLS WITH ANILINES
Authors: Hayashi Hisaharu , Hirota Noboru , Nagakura Saburo
Published: July 2006

Time-resolved phosphorescence spectra were measured at 77 K for several systems containing benzophenone or p-chlorobenzaldehyde as an electron acceptor and aniline, N-methylaniline, or N,N-dimethylaniline as an electron donor in 2-methyltetrahydrofuran. The phosphorescences of the electron donor–acceptor complexes under consideration showed a strong tendency for bimolecular quenching.
BASE-CATALYZED AUTOXIDATION OF 9,10-DIHYDROANTHRACENE WITH ELECTRO-GENERATED SUPEROXIDE ION
Authors: Osa Tetsuo , Ohkatsu Yasukazu , Tezuka Meguru
Published: July 2006

The superoxide ion formed by the electrolysis of oxygen molecule dissolved in pyridine was shown to act as a base-catalyst in autoxidation of 9,10-dihydroanthracene. Iron and cobalt phthalocyanine accelerated the reaction. The rate equation of oxygen consumption was given. The effect of metal phthalocyanine was discussed by cyclic voltammetry.
FLASH PHOTOLYSIS OF A GOLD(III) COMPLEX
Authors: Asai Michihiko , Tazuke Shigeo , Okamura Seizo , Ohno Takeshi , Kato Shunji
Published: July 2006

Flash photolysis of tetra-n-butylammonium tetrabromoaurate (III) was investigated in tetrahydrofuran. Two sorts of transient spectra appeared at 365 nm and 475 nm were analyzed kinetically, the former being assigned to Br2− radical-anion. Additive effect of N-vinylcarbazole was examined.
THE SYNTHESIS OF DIPEPTIDES WHICH CONTAIN α-AMINONITRILES AS THEIR C-TERMINAL RESIDUES
Authors: Kawashiro Katsuhiro , Yoshida Hideyuki , Morimoto Shiro
Published: July 2006

The synthesis of some dipeptides which contain α-aminonitriles as their C-terminal residues is described. The coupling reactions of active esters of N-tritylamino acids, p-nitrophenyl esters or cyanomethyl esters, with α-aminonitriles were carried out in N,N-dimethylformamide. The N-trityl protecting groups of the reaction products were removed by acid hydrolysis without affecting their nitrile groups. In this way, glycylaminoacetonitrile acetate(8), glycyl-Dl-α-aminopropionitrile acetate(10) and Dl-alanylaminoacetonitrile acetate(11) were synthesized.
PHOTOLYTIC AND THERMAL DECOMPOSITIONS OF 2-DIAZOPHENOL. FORMATION OF FULVENE DERIVATIVES
Authors: Yagihara Morio , Kitahara Yoshio , Asao Toyonobu
Published: July 2006

Photolytic decomposition of 2-diazophenol in methanol afforded 6-hydroxy-6-methoxy-2-(2-hydroxyphenylazo)fulvene, guaiol, phenol, and dimer of methyl cyclopentadienecarboxylate. The decomposition in water gave 6,6-dihydroxyfulvene derivative. Thermal decomposition of 2-diazophenol gave fulvenylidenebenzo-1,3-dioxole. Structure and mechanism of the formation of these products are discussed.
CARBOXYLATION OF ACTIVE METHYLENE COMPOUNDS WITH CARBON DIOXIDE IN THE PRESENCE OF FERRIC ALKOXIDE
Authors: Ito Takehiko , Takami Yasuo
Published: July 2006

Active methylene compounds such as cyclohexanone and acetophenone are carboxylated by the reaction with carbon dioxide in the presence of ferric ethoxide under mild conditions to give β-ketoacids.
A STABILITY-SELECTIVITY RELATIONSHIP FOR PHENOLYSES OF ALKYL CHLORIDES AND p-NITROBENZOATES
Authors: Okamoto Kunio , Kinoshita Tomomi
Published: July 2006

The existence of a linear free-energy relationship between the phenolic reactivity and the selectivity for attack of the phenol molecule on carbonium ion intermediates has been established for the titled substrates. The examples are the first ones for the reaction between the carbonium ions and an ambident molecule.
REGIOSPECIFIC NEIGHBORING-GROUP PARTICIPATION BY DITHIOCARBAMATE FUNCTION DURING BROMINATION OF γ-SUBSTITUTED S-ALLYL N,N-DIMETHYLDITHIOCARBAMATES
Authors: Hiratani Kazuhisa , Nakai Takeshi , Okawara Makoto
Published: July 2006

Bromination of the title compounds 1 resulted in the formation of the corresponding 2-dimethylamino-4-bromomethyl-1,3-dithiolan-2-ylium bromide (2) via regiospecific (S-5) participation by the dithiocarbamate function, irrespective of substitution on the γ-carbon atom. This is in contrast to the C-protonation of 1 in which the ratio of S-5 vs. S-6 depends on the γ-substitution.
α-THIOCARBONYL-STABILIZED PHOSPHORANES: STRUCTURE AND ALKYLATION REACTION OF ALKOXYTHIOCARBONYLMETHYLENETRIPHENYLPHOSPHORANES
Authors: Yoshida Hiroshi , Matsuura Hironori , Ogata Tsuyoshi , Inokawa Saburo
Published: July 2006

NMR spectra of alkoxythiocarbonylmethylenetriphenylphosphoranes (II; R=Me, Et, i-Pr) show existence of cis and trans isomers. Alkylation of II took place exclusively at sulfur in quantitative yields. The effects of solvents and alkylating reagents on the products ratio (IIIcis/IIItrans)were also studied.
PHOTOELECTRON SPECTRUM OF DISPIRO[2.2.2.2]DECA-4,9-DIENE. CONJUGATION OF WALSH ORBITALS OF CYCLOPROPANE RINGS WITH ORBITALS OF DIENE
Authors: Harada Yoshiya , Ohno Koichi , Seki Kazuhiko , Inokuchi Hiroo
Published: July 2006

To study the interaction between the Walsh orbitals of cyclopropane rings and its adjacent π-orbitals the photoelectron spectrum of dispiro[2.2.2.2]deca-4,9-diene has been measured by using the 21.22 eV helium resonance line. The first four bands in the PE spectrum have been assigned on the basis of a modified CNDO/2 approximation.
SYNTHESES TOTALES DE L’ACIDE (dl)-CARPAMIQUE ET DE L’ACIDE (dl)-ISO-3 CARPAMIQUE
Authors: Brown Eric , Bourgouin André
Published: July 2006

Hydrolysis of the bis-lactonic alkaloid carpaine 1 is known to yield all-cis 6-(7-carboxy hept-1-yl) 2-methyl piperidin-3-ol 2 (carpamic acid). The first recorded total synthesis is described of (dl)-carpamic acid in five steps, starting from the known β-keto ester Me2C=CH–CH2–CH2–CO–CH2COOEt.
SYNTHESIS AND REACTIONS OF YLIDIC THIABENZENES
Authors: Hori Mikio , Kataoka Tadashi , Shimizu Hiroshi , Narita Ken’ichi , Ohno Sachio , Aoki Harumi
Published: July 2006

Synthesis and structure of novel ylidic thiabenzenes, 1-cyano-and benzoyl-2-methyl-2-thianaphthalenes (VI and X), are discussed. The reactions of VI with several electrophiles such as dimethyl acetylenedicarboxylate, methyl propiolate, diphenylcyclopropenethione, and diphenylcyclopropene are described together with the mechanisms of the reactions.
NEW CYCLIC α-KETOSULFENES
Authors: Tsuge Otohiko , Noguchi Michihiko
Published: July 2006

New cyclic α-ketosulfenes 2 and 8 were generated in situ from the treatment of 2-chlorosulfonyl-1-tetralone (1) and -1-indanone (7) with NEt3. It was found that these two α-ketosulfenes show different characteristics in their dimerization and cycloaddition reactions.
FURTHER EVIDENCE OF INVERSION MECHANISM FOR THE CIS-TO-TRANS THERMAL ISOMERIZATION OF 4-DIMETHYLAMINOAZOBENZENE DERIVATIVES. ADDITIVITY RULE OF SUBSTITUENT CONSTANTS
Authors: Sueyoshi Toshinobu , Nishimura Norio , Yamamoto Shunzo , Hasegawa Shigeo
Published: July 2006

The thermal cis-to-trans isomerization of some substituted 4-dimethylaminoazobenzenes was studied. Substituent effects on the isomerization rate strongly support the view that the isomerization proceeds via inversion at either one of the azo-nitrogen atoms.
THE REACTION OF TETRATHIOFULVALENES WITH 2,3-DICHLORO-5,6-DICYANO-p-BENZOQUINONE. NEW STABLE CATION- and ANION-RADICAL COMPLEXES
Authors: Ueno Yoshio , Okawara Makoto
Published: July 2006

Tetrathiofulvalene derivatives Ia-e reacted with an equimolar amount of 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) in hot acetonitrile or benzene to give new stable cation-radical and anion-radical complexes IIa-e, which had various mole ratios (1:1, 1:2, 2:1).
ONE-STEP SYNTHESIS OF A NEW HETEROCYCLE, 6-METHYLENE-4,7-DIOXABICYCLO[3.2.1]OCT-2-ENE
Authors: Toda Fumio , Fujikawa Masazumi
Published: July 2006

The reactions of 2,2-dibenzoylpropane (Ia) and 1,1-dibenzoylcyclopentane (Ib) with two molar amounts of sodium acetylide in liquid ammonia afforded 8,8-dimethyl-6-methylene-1,5-diphenyl-4,7-dioxabicyclo[3.2.1]oct-2-ene (IIIa) and 6-methylene-1,5-diphenyl-4,7-dioxabicyclo[3.2.1]oct-2-ene-8-spirocyclopentane (IIIb), respectively. Some reactions of III were described.
CATALYSIS BY IRON-POLYPHTHALOCYANINE. REDUCTIVE DEHALOGENATION OF α-CHLORODEOXYBENZOIN WITH 1-BENZYL-1,4-DIHYDRONICOTINAMIDE
Authors: Inoue Hiroo , Aoki Ryuji , Imoto Eiji
Published: July 2006

Iron-polyphthalocyanine catalyzed the reductive dehalogenation of α-chlorodeoxybenzoin with 1-benzyl-1,4-dihydronicotinamide in benzene or 80 vol% aqueous methanol. The accelerating activity of the iron-polyphthalocyanine became larger as compared with those of various iron complexes under the similar condition.
HYPOCHROMISM OF VINYLPOLYMERS WITH LARGE PENDANT π-ELECTRON SYSTEMS
Authors: Okamoto Ken-ichi , Itaya Akira , Kusabayashi Shigekazu
Published: July 2006

The absorption spectra of vinylpolymers with large pendant π-electron systems show the hypochromism, change in the structure of the 1Bb or 1Ba band, and lower (or higher)-frequency shift in comparison with the spectra of the monomeric models. These arise from some electronic interactions between neighboring chromophores in a polymer chain.
HETERA-p-CARBOPHANES. V. EFFECT OF OXYGENATION OF SULFUR ON THE ROTATIONAL BARRIER IN A THIAPARACYCLOPHANE DERIVATIVE
Authors: Sakamoto Kazuhiko , Oki Michinori
Published: July 2006

Dynamic nuclear magnetic resonance study of 17,20-dimethyl-3,13-dioxa-8-thia-2,14-dioxo[15]paracyclophane and its oxygenated derivatives revealed that the barrier to rotation of the aromatic ring increased in the order of sulfide <sulfoxide<sulfone. Transannular interaction of the charge transfer type is discussed as a possible cause for the change in barriers.
ON THE STRUCTURES OF THE FRFF RADICAL PRODUCTS FORMED BY THE REACTION OF DEHYDROASCORBIC ACID WITH AMINO ACIDS
Authors: Yano Midori , Hayashi Tateki , Namiki Mitsuo
Published: July 2006

In addition to the radical products of a triplet esr signal (R-A) and a quintet-doublet (R-B), a new radical product of multiplet signal was isolated from tic of the reaction mixture of dehydroascorbic acid with an amino acid. Structures were postulated for these radical products based on the esr spectral analysis and their properties in relation with the red pigment.
BRILLOUIN SCATTERING SPECTRA OF SURFACTANT SOLUTIONS
Authors: Okabayashi Hirofumi , Okuyama Masataka , Matsuura Hiroatsu , Miyazawa Tatsuo
Published: July 2006

Brillouin scattering was measured for aqueous solutions of potassium n-hexanoate and potassium n-octanoate. The sound velocity in the surfactant solutions increased successively with an increase in surfactant concentration, but it became almost constant at the critical micelle concentration.
THE NEW MICHAEL REACTION
Authors: Narasaka Koichi , Soai Kenso , Mukaiyama Teruaki
Published: July 2006

It was found that silyl enol ethers react with α,β-unsaturated ketones and esters in the presence of TiCl4 under mild (−78°C) conditions to give 1,5-dicarbonyl compounds in good yields. Further, it was also found that 1-phenyl-1,5-hexanedione and its monoacetal were obtained by the TiCl4-promoted reaction of methyl vinyl ketone ethylene acetal with α-trimethylsiloxystyrene.
A NEW SYNTHETIC METHOD FOR β-SUBSTITUTED Δα,β-BUTENOLIDES
Authors: Iwai Kiyoshi , Kosugi Hiroshi , Uda Hisashi
Published: July 2006

α-Phenylsulfinyllactones 2 underwent the Pummerer rearrangement and subsequent elimination of acetic acid by treating with hot acetic anhydride to give α-phenylthiobutenolides 4. Conjugate addition reaction of 4 with organocopper reagents or malonic ester followed by oxidation to sulfoxides and pyrolysis afforded β-monosubstituted or β,γ-disubstituted butenolides 6 in moderate overall yields.
NOVEL FORMATION OF AROMATIC NITRILES BY FRIEDEL-CRAFTS REACTION IN NITROMETHANE
Authors: Yoshifuji Masaaki , Tanaka Susumu , Inamoto Naoki
Published: July 2006

Mesitylene and benzene gave the corresponding nitriles by reaction with anhydrous aluminum chloride and nitromethane at 80°C, together with the corresponding aldoximes.
FREE RADICAL PRODUCT FORMED BY THE REACTION OF DEHYDROASCORBIC ACID WITH AMINO ACIDS
Authors: Namiki Mitsuo , Yano Midori , Hayashi Tateki
Published: July 2006

A short time heating of the reaction mixture of dehydroascorbic acid and amino acid was found to give a fairly stable free radical product(s) which could be isolated on tic as a blue fraction and showed the hyperfine esr spectra.
APPLICATIONS OF ADIABATIC RAPID PASSAGE TO CORRELATION NMR SPECTROSCOPY. I. SOLVENT LINE SUPPRESSION
Authors: Arata Yoji , Ozawa Hiroshi
Published: July 2006

An adiabatic rapid passage method has been proposed for eliminating unwanted lines in correlation NMR spectroscopy. As illustrative examples, correlation NMR spectra of bovine pancreatic ribonuclease A and HEW lysozyme are given where the HDO line is suppressed by the present technique.
NMR STUDY OF AMINO ACIDS AND THEIR DERIVATIVES: DISSOCIATION CONSTANT OF EACH ROTATIONAL ISOMER OF AMINO ACIDS
Authors: Fujiwara Shizuo , Ishizuka Hidehiro , Fudano Shintaro
Published: July 2006

Dissociation constants of each of the three rotational isomers of amino acids, l-serine, l-aspartic acid, l-histidine and l-phenylalanine have been determined by the use of the fractional weights obtained from the NMR coupling constants at several pH values.
NATURE OF ORDERED STRUCTURE OF UNIONIZED POLY-γ-GLUTAMIC ACID STUDIED BY POTENTIOMETRIC TITRATION METHOD
Authors: Homma Etsuko , Ogawa Kozo , Watanabe Takehiko
Published: July 2006

The potentiometric titration of poly-γ-glutamic acid in aqueous solutions has been studied. The results indicate the conformational transition of this polymer in pH 3 to 5, in agreement with the data obtained by ORD and viscosity measurements. The standard free energy change of the conformational transition ΔG°, standard enthalpy change ΔH° and standard entropy change ΔS° were obtained. The results indicate that the content of the ordered structure in unionized state is small compared with the case of normally presented ordered form of α-polypeptides.
CARBON-13 NUCLEAR MAGNETIC RESONANCES OF COBALT(III) COMPLEXES CONTAINING AMINO-ACIDS
Authors: Ama Tomoharu , Yasui Takaji
Published: July 2006

The 13C-NMR spectra of α-amino-acids and their trans(O)-[Co en2(aaH)2]3+ complex ions were measured. The changes in chemical shift on protonation of carboxyl anion group of amino-acids were 2.5∼3.2 ppm and 1.1∼2.1 ppm upfield for the carboxyl carbons and α-carbons, and on coordination of carboxyl group to the cobalt(III) ion 3.8∼4.4 ppm downfield and almost zero for the former and latter carbons, respectively.
SYNTHESIS OF 1-β-(3-PHENYLPYRAZOL-4-YL)-d-RIBOFURANOSIDE, A C-NUCLEOSIDE
Authors: Arakawa Kiichi , Miyasaka Tadashi , Hamamichi Norimitsu
Published: July 2006

1-β- and 1-α-(3-Phenylpyrazol-4-yl)-d-ribofuranosides (7) and (8) have been prepared from 2,3,5-tri-O-benzoyl-d-ribofuranosyl bromide (1) through ethynylation with mercuric phenylacetylide (2) and subsequent 1,3-dipolar addition of diazomethane, followed by removal of the protecting groups with ammonia.
A STUDY OF ELECTRON SPIN RESONANCE SPECTRA OF THE 1,1,2,2-TETRAMETHYLDISILANYL RADICAL
Authors: Sakurai Hideki , Kira Mitsuo , Sato Michiko
Published: July 2006

The title radical, (CH3)2SiSi(CH3)2H, was generated by hydrogen abstraction from H(CH3)2SiSi(CH3)2H. The most stable conformation of the radical at low temperature deduced from the ESR spectrum is the one in which the β-Si–H bond eclipses the p orbital on the silyl radical site.
TRAPPING EXPERIMENT OF RADICAL SPECIES PRODUCED BY GLOW DISCHARGE REACTION OF SOME AROMATIC COMPOUNDS
Authors: Kikkawa Shoichi , Nomura Masakatsu , Morita Yukio , Hosokawa Noritaka
Published: July 2006

The authors have described the successful application of spin trapping as a diagnosis of short-lived free radicals formed from the glow discharge reaction of aromatic compounds. For example, in the decomposition of toluene, benzyl radical was trapped by nitrosobenzene or pheny1-N-t-butylnitrone.
CYCLIC TETRAMERS OF CHIRAL AZIRIDINES. II. ISOLATION OF FOUR STEREOISOMERS
Authors: Tsuboyama Kaoru , Tsuboyama Sei , Uzawa Jun , Higashi Iwami
Published: July 2006

1-Benzyl-2-ethylaziridine (I) was oligomerized to give the cyclic tetramer (II). Four geometrical isomers are possible for II and all of them were isolated and characterized.
THE REACTION OF 3-METHYL-2-BUTENYL PHENYL SULFIDE WITH ALDEHYDES AND KETONES. APPLICATION TO THE SYNTHESIS OF 2,2-DIMETHYLCYCLOPROPANECARBALDEHYDES
Authors: Kondo Kiyosi , Matsui Kiyohide , Negishi Akira
Published: July 2006

The base promoted addition of 3-methyl-2-butenyl phenyl sulfide to aldehydes and ketones occurred selectively on the γ-position of the allylic moiety. The product was converted to the methanesulfonate. Treatment of the resulting homoallylic ester with nucleophiles induced the cyclization to give cyclopropane derivatives in excellent yields.
AN OPTICAL ROTATION STOPPED FLOW APPARATUS
Authors: Watanabe Fumiyuki , Nagamura Toshihiko
Published: July 2006

A stopped flow apparatus has been proposed for optical rotation changes. This apparatus, even when the signals of optical rotation changes are masked by absorption changes, can detect only the signals of optical rotation changes. The apparatus is examined by several model reactions: The maximum sensitivity is 0.01 degree of rotation, the dead time ca. 80 msec. The 50% change of transmittance does not affect the signals of optical rotation changes.
CRITICAL COMPOSITION AND CRITICAL SOLUTION TEMPERATURE OF A BINARY MIXTURE OF ACETONITRILE AND WATER DETERMINED BY VARIABLE-TEMPERATURE PMR SPECTROSCOPIC METHOD
Authors: Morinaga Ken-ichi , Miyaji Kiyoshi , Tsurumi Makoto
Published: July 2006

Each of two PMR signals for a mixture of acetonitrile and water has been found to split into two peaks in a limited composition range at low temperatures. The splittings are attributable to the two-phase separation of the mixture. The critical composition and the critical solution temperature have been estimated by use of this phenomenon.
AN EFFECTIVE SYNTHESIS OF A BROMINE-CONTAINING ANTIBACTERIAL COMPOUND FROM MARINE SPONGES
Authors: Yamada Yasuji , Kim Jin-Suk , Iguchi Kazuo , Suzuki Michio
Published: July 2006

An antibacterial compound 1, 4-acetamido-2,6-dibromo-4-hydroxy-2,5-cyclohexadien-1-one, was effectively synthesized by an oxidation of phenolic amide 3 with thallium triperchlorate in aqueous media.
STRUCTURAL STUDY OF MUCOPOLYSACCHARIDE, CRYSTAL STRUCTURE OF CHONDROSINE MONOHYDRATE
Authors: Senma Masanori , Taga Tooru , Osaki Kenji
Published: July 2006

The structure of chondrosine monohydrate was determined by an X-ray study. The zwitter-ionic character of the molecule and the intermolecular hydrogen bondings stabilize the crystal structure. An intramolecular hydrogen bond is found between the axial oxygen O(4′) and the ring oxygen O(5). The galactosamine moiety has α-configuration in the crystalline state.
THE STEREOSPECIFIC PREPARATION OF METHYL FARNESOATE AND SYNTHETIC PRECURSORS OF C18- AND C17 JUVENILE HORMONES
Authors: Kobayashi Susumu , Mukaiyama Teruaki
Published: July 2006

The new method for the stereospecific preparation of 1,5-diene units was successfully applied to the syntheses of methyl farnesoate and the synthetic precursors of C18- and C17 juvenile hormones, 15 and 20.
A New Synthesis of Carbonohydrazide, Semicarbazide, and Carbazate
Authors: Kondo Kiyoshi , Sonoda Noboru , Sakurai Hiroshi
Published: July 2006

The reaction of carbon monoxide with N,N-dialkylhydrazine in the presence of selenium gave a salt of 3,3-dialkylselenocarbazic acid with hydrazine (I), which was oxidized quantitatively to give carbonohydrazide, water, and selenium. Aminolysis and alcoholysis of I followed by oxidation yielded semicarbazide and carbazate respectively in excellent yields under mild conditions.
PHOTOCHEMISTRY OF N2O5 WITH ADAMANTANES
Authors: Tabushi Iwao , Kojo Shosuke , Yoshida Zen-ichi
Published: July 2006

Photochemical reaction of N2O5 with adamantane is investigated. Products were 1-adamantyl nitrate(I), 1-nitroadamantane(II) , adamantanone(III), and 2-nitroadamantane(IV) , in the ratio of 5.5 : 4.4 : 2.2 : 1. The reaction is shown to proceed via triplet state of N2O5 and to have a typical chain character from the quantum yield measurement. NO3· is shown to be a chain carrier.
o-THIOQUINOMETHIDES. PREPARATION AND THE EQUILIBRIUM WITH THE [4+4] DIMER
Authors: Okazaki Renji , Inamoto Naoki
Published: July 2006

Photochemical reactions of 4,5-benzo-1,2-dithiole-3-thione with cycloalkenes afforded deep blue o-thioquinomethides which are in thermal equilibrium with the colorless dimers.
AMINOALUMINUM HYDRIDE AS NEW REDUCING AGENTS. I. SELECTIVE REDUCTION OF CARBOXYLIC ACIDS TO ALDEHYDES
Authors: Muraki Masayoshi , Mukaiyama Teruaki
Published: July 2006

A new method for the preparation of aldehydes from carboxylic acids by use of diaminoaluminum hydride is described. Reducing agents, diaminoaluminum hydrides, were prepared from aluminum hydride and two moles of various secondary amines. It was found that bis(4-methylpiperazinyl)aluminum hydride is the most suitable reducing agent, which reduces carboxylic acids to the corresponding aldehydes at room temperature or under reflux in good yields.
CONTROL PARAMETERS ON THE STEREOSELECTIVITY OF THE MICHAEL-TYPE ADDITION TO SUGAR NITROOLEFINS
Authors: Funabashi Masuo , Okamura Yuzuru , Mikami Kazutoshi , Yoshimura Juji
Published: July 2006

The stereoselectivity on the addition reaction of nucleophiles (CH3O− and PhCH2S−) to three model compounds, 6-deoxy-1,2-o-isopropylidene-6-nitro-3-o-substituted-α-d-xylo-hex-5-enofuranoses (1a, 1b and 1c) was examined in terms of six control parameters.
ACTIVATION ENERGY FOR HOLE INJECTION AND ANALYSIS OF THE SPACE CHARGE LAYER IN ANTHRACENE CRYSTALS
Authors: Kotani Masahiro , Watanabe Yoko , Kato Tomoko
Published: July 2006

It was found that the activation energy for hole injection at Ce4+/anthracene interface depends on the applied voltage. From an analysis of the voltage dependence the thickness of the space charge layer and the charge concentration in it could be estimated.
VERATRENONE, A NEW ALKALOID FROM VERATRUM SPECIES
Authors: Takasugi Mitsuo , Castro-Araya Victor Hugo , Masamune Tadashi , Furusaki Akio , Matsumoto Takeshi
Published: July 2006

A new alkaloid, designated as veratrenone, was isolated from Veratrum album L. var. glandiflorum Maxima. and assigned formula I on the basis of the spectral data and X-ray crystallography. The alkaloid is the first compound, whose structure represents the transition between the Fritillaria and ceveratrum alkaloids.
THE REACTION OF LITHIUM TRIALKYLVINYLBORATES AND ALDEHYDES AS APPLIED TO THE SYNTHESIS OF 1,3-DIOLS, γ-CHLOROALCOHOL, AND CYCLOPROPANE
Authors: Utimoto Kiitiro , Uchida Keiichiro , Nozaki Hitosi
Published: July 2006

Reaction of lithium trialkylvinylborates with aldehydes gives non-isolable boron compounds, 1,2-oxaborolane-bases borates (II) whose oxidative work-up furnishes 1,3-diols (III) smoothly. Successive treatment of a cyclic borate with phosphorus pentachloride and aqueous alkali provides a cyclopropane.
BARBARALYLIDENE, A NEW TYPE OE NUCLEOPHILIC CARBENE
Authors: Tsuruta Haruki , Mori Seiichi , Nishizawa Yoshinori , Mukai Toshio , Murahashi Shunichi , Hino Kenichi , Bansho Kenji , Moritani Ichiro
Published: July 2006

This study was carried out to elucidate the properties of barbaralylidene (II). Vacuum thermolysis of sodium salt of barbaralone tosylhydrazone (III) afforded mainly ethynylcycloheptatrienes (IV, V, and VI). The carbene (II), which was derived from III, did not add to electron-rich olefins, but instead added to electron-deficient olefins such as dimethyl fumarate, maleate or methyl acrylate to give spiro-cyclopropane derivatives (VII or XII) in addition to VIII or IX.
PREPARATION OF SQUARATO-COMPLEXES AND THE THERMAL SE REACTION THEREOF IN SOLID-PHASE
Authors: Tsuchiya Ryokichi , Uehara Akira , Sakui Masako , Kyuno Eishin
Published: July 2006

[Cr(NH3)6][Al(C4O4)3] was prepared by the reaction of [Cr(NH3)6] (NO3)3 with K3[Al(C4O4)3]·2H2O, where C4O42− designates squarate ion. The thermal reaction of the complex in the solid-phase was investigated by means of derivatography. It was found that the squarate ion initially coordinated to Al(III) ion migrates to Cr(III) ion upon heating through the formation of a transient intermediate in which the squarate ion is coordinated bilaterally toward both metal ions; the complex is converted finally into Al[Cr(C4O4)3].
DEAMINATION OF 2-BENZOYLAZIRIDINES BY FERROUS IODIDE
Authors: Imamoto Tsuneo , Yukawa Yasuhide
Published: July 2006

2-Benzoylaziridines (Ia–c and IIa,b) were deaminated to the corresponding trans-benzalacetophenones in high yields at room temperature by ferrous iodide.
THE CRYSTAL STRUCTURE OF 1-(2-THIAZOLYLAZO)-2-NAPHTHOL
Authors: Kurahashi Masayasu
Published: July 2006

Crystal and molecular structure of 1-(2-thiazolylazo)-2-naphthol has been determined by X-ray analysis. Evidence for the coexistence of the azo and hydrazone tautomer was obtained.
HALOGENOBENZOQUINOPHTHALONE AS A NEW PIGMENT TO REPLACE CADMIUM YELLOW
Authors: Matsuoka Masaru , Kitao Teijiro , Konishi Kenzo
Published: July 2006

A new organic pigment, 5,8-dibromo-3′-hydroxybenzo[b]quinophthalone, has been developed to replace cadmium yellow. This compound is very similar to cadmium yellow in colour and has excellent pigment properties, such as good fastness to light, heat, migration, acid, alkali and organic solvents.
POLAROGRAPHY OF TRIS(2,2′-BIPYRIDINE)VANADIUM(0)
Authors: Saji Tetsuo , Aoyagui Shigeru
Published: July 2006

Polarograms and cyclic voltammograms of tris(2,2′-bipyridine)vanadium(0) were taken in a DMF solution. They exhibited three one-electron reduction waves corresponding to VL3−/VL3 (L=2,2′-bipyridine)-VL32−/VL3− and VL33/VL32− and two oxidation waves corresponding to VL3/VL3+ and VL3+/VL32+. The oxidation-reduction potential difference for VL3+ was anomalously small. This was explained by assuming diamagnetism of VL3+.
SOLID-PHASE THERMAL SE REACTION OF METAL COMPLEXES
Authors: Tsuchiya Ryokichi , Uehara Akira , Kyuno Eishin
Published: July 2006

A new type of solid-phase thermal reaction of metal complexes was found with [Cr(NH3)6][Al(ox)3] and [Cr(H2O)(NH3)5][Al(ox)3] by means of derivatography. Both the complexes were found to convert finally into Al[Cr(ox)3]. The reaction is differentiated from prior thermal SN reaction of metal complexes in respect to the involvement of metal substitution.
ARYLATION OF TETRAZOLIDE WITH DIARYLIODONIUM HALIDES: EVIDENCE FOR INTERMEDIACY OF BENZYNE
Authors: Akiyama Tetsuo , Imasaki Yoshio , Kawmisi Mituyosi
Published: July 2006

By the reaction with sodium 5-phenyltetrazolides (II) di-p-tolyliodonium bromide (I) afforded 1-m-tolyl-(III), 2-m-tolyl-5-phenyltetrazole (IV), t-butyl m-tolyl ether (V) together with corresponding p-isomers. This result infers the existence of the pathway through a benzyne.
REACTIVITIES OF 4,5-BRIDGED QUINAZOLINES
Authors: Sakane Kazuo , Otsuji Yoshio , Imoto Eiji
Published: July 2006

Introduction of the 4,5-bridged five-membered ring to quinazoline derivatives enhanced the rate of the acid-catalized hydrolysis of the quinazoline ring in the derivatives due to a steric effect caused by the presence of the bridged ring. This steric effect also reflected in their pKa values and polarografic half-wave potentials.
THE 13C CIDNP STUDIES ON THE PHOTOLYSIS OF METHYL DIAZOACETATE IN CHLORO-SUBSTITUTED METHANES
Authors: Iwamura Hiizu , Imahashi Yuzo , Oki Michinori , Kushida Katsuhiko , Satoh Shiro
Published: July 2006

The photolysis of methyl diazoacetate in CCl4, CHCl3, CH2Cl2, and CFCl3 has been examined by the 13C CIDNP methods. The insertion products Cl2XCCHClCO2CH3 (X=Cl and H) show emission for the carbonyl and C-3 carbons and enhanced absorption for C-2. The cage recombination of geminate pairs ‾Cl2XC· ·CHClCO2CH3 formed by the cleavage of the corresponding chloronium ylides is responsible for the polarization.
EFFECTS OF LIGANDS ON VARIOUS NMR PARAMETERS OF β-METHOXYISOBUTYLMERCURY COMPOUNDS
Authors: Ibusuki Takashi , Saito Yasukazu
Published: July 2006

Effects of ligands on various nmr parameters have been studied for (CH3)2C(OCH3)CH2HgL, and a linear relationship is found between 1JHgC and 2JHgH. With regard to δ199Hg and δ13C vs. 2JHgH, deviations from linearity occurring for the CN and SCN ligands are discussed in terms of π-bonding effect.
PHOTOELECTRON SPECTRUM (HeI) OF 9-METHYLANTHRACENE
Authors: Hino Shojun , Inokuchi Hiroo
Published: July 2006

A photoelectron spectrum of 9-methylanthracene, with first five π bands located at 7.25, 8.43, 9.07, 9.87, and 10.30 eV, is presented. Assignments of the bands based on CNDO and INDO calculations are given. In comparison with the spectrum of anthracene, the effects of the methyl group in 9-methylanthracene on the photoelectron spectrum are explained well by the MO calculations.
A CONVENIENT METHOD FOR THE SYNTHESIS OF γ-SUBSTITUTED-β -ACETYL- γ -BUTYROLACTONES
Authors: Mukaiyama Teruaki , Hanna Junichi , Inoue Tan , Sato Toshio
Published: July 2006

It was established that γ-substituted-β-acetyl-γ-butyrolactones are prepared in good yields by the reaction of α -angelicalactone with various aldehydes in the presence of BF3·O(C2H5)2.
PHOTOOXYGENATION OF ROTENONE
Authors: Chubachi Mitsuo , Hamada Masayuki
Published: July 2006

In the photooxygenation of rotenone(I) in pyridine solution, two isomers of rotenolones, 6aβ, 12aβ- and 6aβ, 12aα-rotenolones (II and III), were obtained besides dehydrorotenone(V) and rotenonone(VI). As one of acidic products, a keto-acid (IVa) was also isolated.
X-RAY PHOTOELECTRON SPECTRA OF PHOSPHORUS YLIDES. PROBING THE PHOSPHORUS-CARBON YLIDE BOND
Authors: Seno Manabu , Tsuchiya Shinji , Asahara Teruzo
Published: July 2006

The nature of the phosphorus-carbon ylide bond was investigated by means of XPS. The binding energies of P-2p electrons of Ph3P=CHCOR (R=p-nitrophenyl, phenyl, p-methoxyphenyl) were found to be lower than that of Ph3P=CHCOOMe. The binding energies of ylides are lower than those of the corresponding salts. These results are qualitatively consistent with IR data and 13P-nmr data.
DETERMINATION OF THE OPTICAL PURITY OF AMINO ACIDS BY COMPLEX FORMATION
Authors: Fujii Yuki , Yoneda Hayami
Published: July 2006

A new method has been established to determine the optical purity of small amount of amino acids (alanine, valine, and leucine). The method utilizes the fact that when the optically active amino acid is dissolved in an alkaline solution of K[Co(baen)(gly)2] complex, the mixed solution shows much larger optical rotation than that of the free amino acid in the visible region.
RING TRANSFORMATIONS OF OXYGEN CONTAINING HETEROCYCLES INTO NITROGEN CONTAINING HETEROCYCLES OVER SYNTHETIC ZEOLITES
Authors: Hatada Kou , Shimada Masatoshi , Fujita Katsuhiro , Ono Yoshio , Keii Tominaga
Published: July 2006

Synthetic zeolites are found to be effective catalysts for ring transformation of heterocycles. Furan reacts with ammonia over BaY to form pyrrole in 100% selectivity at 330°C. Tetrahydrofuran is converted to pyrrolidine in 70% selectivity over HY and MgY at 320°C, and γ-butyrolactone is converted to 2-pyrrolidone in 80% selectivity over CuY.
FACILE CONVERSION OF THIOLESTERS INTO THIOLS USING CYSTEAMINE
Authors: Endo Tadashi , Oda Kuniyuki , Mukaiyama Teruaki
Published: July 2006

It has been found that thiols having functional groups susceptible to hydrolysis and reduction such as acylurea and nitro groups are readily prepared in high yields by simply treating the corresponding thiolesters with cysteamine in acetonitrile at 65°C for 10–40 min.
SPECIFIC BEHAVIOR OF KBF3OH OBSERVED IN PMR ON THE INTERACTION BETWEEN La(III)-NITRILOTRIACETATE CHELATE AND FLUOROBORATES
Authors: Moriguchi Yoshiki
Published: July 2006

The effects of NaF, KBF3OH and NaBF4 on the proton magnetic resonance spectra of La(III)-NTA chelate were investigated in 1:2 molar ratio of La to NTA in H2O solution at 35°C. The remarkable change of PMR spectra occurs in the presence of KBF3OH, which is not explained by simple effect of free F− formed by hydrolysis from BF4− and BF3OH−.
AN EVALUATION OF THE AROMATICITY IN TROPOTHIONE BASED ON C-13 NUCLEAR MAGNETIC RESONANCE
Authors: Machiguchi Takahisa , Inagaki Yoshio , Hoshino Masamatsu , Kitahara Yoshio
Published: July 2006

Analyses of the C-13 FT-NMR spectra of tropothione (I) appeared recently as a new troponoid compound and its parent tropone (II) in dilute solutions are reported in order to evaluate the aromatic character in (I). Polyolefinic character of (I) is confirmed and remarkable differences in chemical shifts between (I) and (II) are observed in accordance with the SCF MO calculations.
β-l-IDOFURANOSE DERIVATIVES CONTAINING HETEROCYCLIC RING AT C-5 AND C-6
Authors: Iwakawa Masaharu , Yoshimura Juji
Published: July 2006

Two pairs of 3-O-benzyl-1,2-O-isopropylidene-β-l-idofuranose derivative containing thiazolidine-2-thione and oxazoline-rings at C-5 and C-6 were synthesized.
ENZYMATIC SYNTHESIS OF SQUALENE ANALOGS FROM GERANYL PYROPHOSPHATE ANALOGS
Authors: Koyama Tanetoshi , Ogura Kyozo , Seto Shuichi
Published: July 2006

8-n-Butylgeranyl pyrophosphate and 10,11-dihydrofarnesyl pyrophosphate act as substrates for the “tail-to-tail” condensation catalyzed by pig liver microsomal enzyme, yielding the corresponding squalene analogs.
CRYSTALLIZATION OF 3Ln2O3·5Ga2O3 GLASSES
Authors: Yajima Seishi , Okamura Kiyohito , Shishido Toetsu
Published: July 2006

The oxide glasses of 3Ln2O3·5Ga2O3 were prepared, using Pr, Nd, Sm, Eu or Gd as a lanthanoid element. Crystallization of the glasses was studied by DTA and X-ray diffraction. A metastable phase was found on the way of the crystallization process of 3Pr2O3·5Ga2O3 and 3Nd2O3·5Ga2O3 glasses terminating in the transition into garnet. However, the phase transition transforming the amorphous phase directly into garnet not through a metastable phase was observed in case of 3Ln2O3·5Ga2O3 glasses (Ln=Sm, Eu or Gd).
A NEW ROUTE FOR SYNTHESIS OF 3,6-DIALKYL-1,4-DIMETHYL-3,6-EPITHIO-AND -3,6-EPIDITHIO-2,5-PIPERAZINEDIONES
Authors: Yoshimura Juji , Nakamura Hiroshi , Matsunari Kenji , Sugiyama Yuichi
Published: July 2006

Five-steps conversion of 3,6-dialkyl-1,4-dimethyl-2,5-piperazinediones into the corresponding 3,6-epithio and -epidithio derivatives: i.e. conversion into 3,3α,6,6α-tetrabromide, substitution of 3,6-bromine atoms with methanol, reduction of 3α,6α-bromine atoms, conversion of 3,6-methoxyl groups into mercapto groups, and then oxidation, is described.
REACTION OF VINYL SULFIDES WITH ALDEHYDES IN THE PRESENCE OF LEWIS ACIDS
Authors: Mukaiyama Teruaki , Kamio Kunimasa , Narasaka Koichi
Published: July 2006

A wide variety of ethyl 3-indenyl sulfides were easily prepared by the reaction of vinyl sulfides with aldehydes in the presence of various Lewis acids such as aluminum chloride.
CIRCULAR DICHROISM OF d-PHENYLGLYCINE
Authors: Takagi Shoji , Nomori Hiroyuki , Hatano Masahiro
Published: July 2006

The vibrational structure in circular dichroism spectrum of d-phenylglycine in the wavelength region corresponding to the α-band of the phenyl chromophore was observed at room temperature and at liquid nitrogen temperature. We analyzed this vibrational structure in comparison with that of l-phenylalanine.
HYDROCRACKING OF 9,10-ANTHRAQUINONE
Authors: Sakai Tomoya , Hattori Masayuki
Published: July 2006

Non-catalytic hydrocracking of 9,10-anthraquinone at 600–900°C proceeded as a typical consecutive reaction yielding fluorenone plus CO in the first step, biphenyl plus CO and benzene in the succeeding steps. The found reaction which is expected to occur for general quinones has an important industrial meaning in the hydrocracking of petroleum heavy residues.
NUCLEOPHILIC SUBSTITUTION AND ELIMINATION REACTIONS ON NITROGEN ATOM—REACTION OF N,N-DIBENZYL-O-p-NITROBENZOYLHYDROXYLAMINE WITH VARIOUS NUCLEOPHILES IN DIPOLAR APROTIC SOLVENT
Authors: Oae Shigeru , Sakurai Tadamitsu , Kozuka Seizi
Published: July 2006

The reactions of N,N-dibenzyl-O-p-nitrobenzoylhydroxylamine (DNH) with nucleophiles were found to give benzaldehyde, benzylamine and p-nitrobenzoate ion in good yields, respectively. It has been suggested that these reactions would proceed via E2 mechanism on the nitrogen atom on the basis of kinetic isotope experiment. Furthermore, SN2 mechanism on the nitrogen atom has been inferred for the reaction of DNH with cyanide ion.
ABSORPTION SPECTRA OF ORIENTED AND AMORPHOUS NAPHTHACENE AND PENTACENE FILMS
Authors: Kamura Yusuke , Shirotani Ichimin , Inokuchi Hiroo , Maruyama Yusei
Published: July 2006

The absorption spectra of the oriented and amorphous naphthacene and pentacene films were measured at room temperature. The electronic state and the reactivity for both states were discussed.
THE MOLECULAR STRUCTURES OF PALLADIUM(II), COPPER(II) AND NICKEL(II) CHELATE OF 1-(2-THIAZOLYLAZO)-2-NAPHTHOL
Authors: Kurahashi Masayasu
Published: July 2006

The structures of palladium(II), copper(II) and nickel(II) chelate of 1-(2-thiazolylazo)-2-naphthol have been determined by X-ray analysis. The coordination configuration around the metal atom has been found to be square-planar, square-pyramidal and octahedral for palladium, copper and nickel, respectively.
SELECTIVE CLEAVAGE OF N-t-BUTOXYCARBONYL PROTECTING GROUP
Authors: Kinoshita Hideki , Kotake Hiroshi
Published: July 2006

The selective cleavage of BOC-peptide-OBut was investigated by the use of 85% formic acid, and it was found that BOC-peptide-OBut gave H-peptide-OBut in good yield by this procedure. This method was also applied to investigation of the selectivity of di-t-butyl esters of dibasic amino acids and N-deprotection of peptides containing these amino acids.
HOMOGENEOUS HYDROGENATION OF ALKENES BY THE COMPLEX OF POLYACRYLIC ACID WITH RHODIUM(III)
Authors: Nakamura Yoshio , Hirai Hidefumi
Published: July 2006

The complex of polyacrylic acid with rhodium(III) functions as a homogeneous catalyst for the hydrogenation of terminal alkenes in methanol solution at 30°C under an atmospheric pressure of hydrogen. The triethylammonium salt of the complex is effective for the hydrogenation of internal alkenes as well as terminal alkenes.
REACTION OF MIXED CARBOXYLIC ANHYDRIDES WITH GRIGNARD REAGENTS. A CONVENIENT METHOD FOR THE PREPARATION OF 1,4- OR 1,6-DIKETONES
Authors: Araki Masashi , Sakata Shigeru , Takei Hisashi , Mukaiyama Teruaki
Published: July 2006

It was found that mixed carboxylic anhydrides of γ- or ε-oxocarboxylic acids react with Grignard reagents to give 1,4- or 1,6-diketones in 32∼71% yields by one step procedure.
SYNTHESES OF FURANS AND PYRROLES FROM ACYCLIC 1,3-DIENES VIA 3,6-DIHYDRO-1,2-DIOXINS
Authors: Kondo Kiyosi , Matsumoto Masakatsu
Published: July 2006

Base-catalyzed isomerization of 3,6-dihydro-1,2-dioxins followed by dehydration and the isomerization in the presence of primary amines provide useful, high yield routes to furans and pyrroles, respectively.
POTENTIOMETRIC ANALYSIS OF THE FORMOSE REACTION
Authors: Matsuura Teruo , Shigemasa Yoshihiro , Sakazawa Chikahiro
Published: July 2006

The course of the calcium hydroxide-catalyzed reaction of formalin to give monosaccharides was potentiometrically followed. Changes of the oxidation-reduction potential curve obtained were found to correspond satisfactorily to the reaction phases; induction period, accumulation of C3 products, saccharide formation, and gradual decomposition of saccharides, successively.
QUANTITATIVE ESTIMATES OF π-CONTACT TERM CONTRIBUTIONS TO THE LANTHANIDE-INDUCED 1H AND 13C SHIFTS IN ANILINE AND p-TOLUIDINE
Authors: Hirayama Masatoshi , Sato Michihiko
Published: July 2006

An attempt was made for the separation of contact term contributions from the Pr(FOD)3- and Eu(FOD)3-induced 1H and 13C shifts in aniline and p-toluidine, by using the contact shift pattern estimated theoretically. This suggested the transfer of negative and positive spin from the Eu ion and the Pr ion, respectively.
A NEW REAGENT FOR ALDEHYDE SYNTHESIS: METHYLENEBIS(N,N-DIMETHYLDITHIOCARBAMATE)
Authors: Nakai Takeshi , Okawara Makoto
Published: July 2006

Treatment of the title compound with n-butyllithium produces the lithiomethylene derivative (4) . The reagent 4 so generated has been shown to serve effectively as an equivalent of the formyl anion by alkylation of 4 with alkyl halides followed by hydrolysis with mercuric ion to the corresponding aldehyde.
ION-MOLECULE REACTIONS BETWEEN THALLIUM(I) AND VARIOUS LIGANDS: FORMATION OF 1:1 COMPLEXES IN GAS PHASE
Authors: Nakayama Hiroaki , Nishijima Chiho , Tachiyashiki Satoshi
Published: July 2006

Gas phase reactions of thallium(I) cation with several ligands were investigated by the use of hexafluoroacetylacetonatothallium(I) as a precursor of the ion. 1:1 complex formation with thallium(I) was observed.
IONIZATION OF LONG-LIVED HIGHLY EXCITED STATES OF HYDROGEN AND DEUTERIUM ATOMS BY COLLISION WITH WATER MOLECULES
Authors: Shibata Takemasa , Fukuyama Tsutomu , Kuchitsu Kozo
Published: July 2006

Long-lived highly excited Rydberg states of hydrogen (deuterium) atoms, H** or D**, were produced by impact of 80 eV electrons on H2O or D2O molecules. The ratio of the ionization cross sections forming protons and deuterons, σ(D**+D2O→D++D2O+e)/σ(H**+D2O→H++D2O+e), was estimated from the dependence of the ion intensities on the target gas pressures to be 1.35±0.15. This ratio is in close agreement with a theoretical estimate, 1.38, based on Matsuzawa’s theory predicting the transfer of the rotational energy of a polar target to the Rydberg electron when the excited atom is ionized.
SUBSTITUENT EFFECTS ON 13C CHEMICAL SHIFTS OF CARBOXYL CARBONS IN SUBSTITUTED BENZOIC ACIDS
Authors: Niwa Jun , Yamazaki Mitsuru
Published: July 2006

The 13C chemical shifts of carboxyl carbons of substituted benzoic acids in dimethyl sulfoxide-d6 show a linear relationship with pKa-values for m- and electron-withdrawing p-substituents, whereas for electron-donating p-substituents they show upfield deviations from the regression line. The chemical shifts are determined by Yukawa–Tsuno’s equation with a negative r-value.
SYNTHESES OF FLUORINE-CONTAINING INDANES AND INDENES: A NOVEL RADICAL CYCLOADDITION OF ALKYLBENZENES WITH HEXAFLUOROPROPENE
Authors: Kimoto Hiroshi , Muramatsu Hiroshige , Inukai Kan
Published: July 2006

Four 1-trifluoromethyl-1,2,2-trifluoroindanes(IV) were synthesized in one step from alkylbenzenes(I) and hexafluoropropene(II) in the presence of di-t-butyl peroxide. The dehydrofluorination of IV gave the corresponding 1-trifluoromethyl-1,2-difluoroindenes(V).
REACTION OF HALOANTHRAQUINONES WITH TRI-n-BUTYLPHOSPHINE
Authors: Arai Sadao , Yamagishi Takamichi , Hida Mitsuhiko
Published: July 2006

New phosphonium salts were obtained by the reaction of 1-amino-2,4-dibromoanthraquinone or sodium 1-amino-4-bromoanthraquinone-2-sulfonate with tri-n-butylphosphine in the presence of cuprous chloride. In these reactions, the bromine atom of anthraquinone derivatives was substituted by the phosphine to give phosphonium salts containing carbon–phosphorus bond.
SYNTHESIS OF Mg3(PO4)2·8H2O
Authors: Kanazawa Takafumi , Umegaki Takao , Wasai Eiji
Published: July 2006

Mg3(PO4)2·8H2O was prepared by converting Mg3(PO4)2·22H2O in an alkaline solution at a pH of about 9. The conversion period was reduced to 2–4 weeks by the addition of MgHPO4·3H2O to the 22-hydrate and the pH adjustment with Na2CO3.
INDUCED CIRCULAR DICHROISM OF DYES BURIED IN SOLID “LIQUID CRYSTAL” FILMS OF POLY-γ-METHYL-d-GLUTAMATE
Authors: Tsuchihashi Nobuaki , Nomori Hiroyuki , Hatano Masahiro , Mori Shigeo
Published: July 2006

Induced circular dichroism was found for achiral molecules when buried in the solid film of PMDG made by casting from solution. This circular dichroism is regarded to be induced by the dissymmetric field due to the supramolecular helical structure of PMDG molecules retained in the solid film.
THE REACTION OF METAL ACETYLACETONATES WITH CHLORAL
Authors: Uehara Kaku , Ohashi Yoshiyuki , Tanaka Makoto
Published: July 2006

The reaction of metal acetylacetonate(M(acac)n) with chloral has been investigated from the viewpoint of the catalyses of M(acac)n in the crossed aldol reaction of chloral with acetylacetone, and in the polymerization of chloral.
STRUCTURE AND REACTIVITY OF ORGANIC IONS IN GAS-PHASE RADIOLYSIS. VII. PROTON EXCHANGE REACTION IN ELECTROPHILIC AROMATIC SUBSTITUTION
Authors: Yamamoto Yukio , Takamuku Setsuo , Sakurai Hiroshi
Published: July 2006

In the gas-phase radiolysis of a C3H8(100 mm)–C6H6 mm)–C6D6(5 mm) mixture, it has been shown that isopropylbenzene (IPB) formed by the attack of i-C3H7+ ions to benzene consists of IPB-d1, -d2, -d3, and -d4 as well as IPB-d0 and -d5, indicating that a proton exchange between an intermediate complex and benzene molecules has occurred.
PHASE TRANSITION OF LEAD(II) SUCCINATE
Authors: Nagase Kenzo , Yokobayashi Hiroko
Published: July 2006

Lead(II) succinate exhibited a phase transition from tetragonal to cubic at 160°C, with ΔH = 0.6 kcal/mol and ΔS = 1.4 cal/mol deg. The phase transition was reversible and characterized by accompanying a great change in infrared absorption spectrum.