bluuebunny/crossref_metadata_2025 huggingface dataset:
A MODEL STUDY OF REGENERATION PROCESS IN RHODOPSIN VISUAL CYCLE
Authors: Sakurai Minoru , Shirota Osamu , Inoue Yoshio , Chûjô Riichirô
Published: July 2006

The regeneration process in rhodopsin was studied by an estimation of isomer population at photoequilibrium for the model compounds of N-retinylidene phosphatidylethanolimine. We suggested that the preferential formation of 11-cis isomer may be induced by the through-bond effect of oxygen atom of imine moiety of a Schiff base.
TWO NEW SESQUITERPENOIDS (ALPINOLIDE AND HANAMYOL) FROM ALPINIA JAPONICA (THUNB.) MIQ.
Authors: Itokawa Hideji , Morita Hiroshi , Watanabe Kinzo , Takase Akiko , Iitaka Yoichi
Published: July 2006

Two new sesquiterpenoids (alpinolide and hanamyol) were isolated from Alpinia japonica (THUNB.) MIQ. and the structures were determined by the spectral, the chemical evidence and X-ray analysis. The chemical transformation of hanalpinol into alpinolide may suggest the biogenesis of furopelargone A and B.
THE MICHAEL REACTION OF 2-(PHENYLTHIO)-2-PENTEN-5-OLIDE WITH SOME BENZYLIC GRIGNARD REAGENTS. SYNTHESIS OF SECOCRISPIOLIDE
Authors: Kato Michiharu , Ouchi Akihiko , Yoshikoshi Akira
Published: July 2006

The electrophilic reactivity of 2-(phenylthio)-2-penten-5-olide toward some benzylic Grignard reagents was investigated, and 2-methylene-3-(2,6-dimethylbenzyl)-5-pentanolide (secocrispiolide) was synthesized from one of the Michael adducts.
ERYTHRO-SELECTIVE ALDOL REACTION USING PHENYLDICHLOROBORANE
Authors: Hamana Hiroshi , Sasakura Kazuyuki , Sugasawa Tsutomu
Published: July 2006

High erythro-selectivity could be attained in the aldol reaction of ethyl ketones with aldehydes using phenyldichloroborane in the presence of ethyldiisopropylamine.
A CHEMOSELECTIVE CONVERSION OF ALKYL AND ARYL AZIDES TO AMINES WITH SODIUM HYDROGENTELLURIDE
Authors: Suzuki Hitomi , Takaoka Koji
Published: July 2006

By treatment with sodium hydrogentelluride in ethanol/ether at room temperature, alkyl and aryl azides are easily converted to the corresponding primary amines in good yields.
HETEROGENEOUS ASYMMETRIC HYDROGENATION OF CHIRAL DEHYDROTRIPEPTIDES
Authors: Takasaki Michiaki , Harada Kaoru
Published: July 2006

Asymmetric catalytic hydrogenation of chiral tripeptides containing a dehydroalanine residue were carried out using palladium on charcoal as a catalyst. The asymmetric yield of the resulting alanine was in the range of 43 to 93%.
PRACTICAL SYNTHESIS AND POLYMERIZATION OF TRIFLUOROVINYLSILANES. A POSSIBLE PRECURSOR OF POLY(DIFLUOROACETYLENE)
Authors: Hiyama Tamejiro , Nishide Kiyoharu , Obayashi Michio
Published: July 2006

An improved procedure for the preparation of trifluorovinylsilanes was established which involved addition of butyllithium to a mixture of chlorosilanes and commercially readily available chlorotrifluoroethylene at −78 to −130 °C, and the resulting monomer was polymerized with a catalyst such as CsF or (R2N)3S+ F2SiMe3− to give black metallic polymer which showed conductivity of 10−9 to 10−10 Ω−1cm−1.
ENANTIOSELECTIVE SYNTHESIS OF MONOFLUORINATED MALONIC ACID MONOESTERS WITH ENZYMES OF MICROBIAL ORIGIN
Authors: Kitazume Tomoya , Sato Takehiko , Ishikawa Nobuo
Published: July 2006

The optically active (+)- and (−)-2-fluoro-2-substituted malonic acid monoesters useful as the practical chiral synthon were obtained by the microbial hydrolysis of the corresponding malonic acid diesters with esterases or cellulases.
INTRODUCTION OF CENTER OF CHIRALITY INTO FLUOROCOMPOUNDS BY MICROBIAL TRANSFORMATION OF 2,2,2-TRIFLUOROETHANOL
Authors: Kitazume Tomoya , Ishikawa Nobuo
Published: July 2006

2,2,2-Trifluoroethanol is found to be a valuable synthetic tool proceeding to the chiral trifluoromethylated compounds via enantiotopic differentiating reaction and carbon-carbon bond formation with active fermenting baker’s yeast.
MgBr2-PROMOTED ELECTROSYNTHESIS OF SULFENIMINES (THIOOXIMES) FROM α-AMINOALKANOATES AND DIARYL/DIALKYL DISULFIDES IN A CH2Cl2–H2O TWO-PHASE SYSTEM. A STRAIGHTFORWARD PREPARATION OF C(6)/C(7)-SULFENIMINE DERIVATIVES OF PENICILLIN AND CEPHALOSPORIN
Authors: Torii Sigeru , Tanaka Hideo , Hamano Sin-ichi , Tada Nobuhito , Nokami Junzo , Sasaoka Michio
Published: July 2006

Direct transformation of α-aminoalkanoates and diaryl or dialkyl disulfides to the corresponding sulfenimines by electrolysis in a CH2Cl2–H2O–MgBr2-(Pt electrodes) system and its application to the sulfenylation of C(6)/C(7)-amino groups of penicillin and cephalosporin are described.
A CONVENIENT METHOD FOR THE SYNTHESIS OF α-PHENYLTHIO-α,β-UNSATURATED KETONE BY STANNOUS TRIFLATE PROMOTED REARRANGEMENT OF α-SULFINYL KETONE
Authors: Akiyama Takahiko , Iwakiri Hiroshi , Shimizu Makoto , Mukaiyama Teruaki
Published: July 2006

α-Phenylthio-α,β-unsaturated ketones are prepared in fairly good yields on treatment of α-sulfinyl ketone with stannous triflate. α-Phenylthio-α,β-unsaturated cyanides are also prepared from α-sulfinyl cyanides according to the similar procedure.
SINGLET-PHOTOSENSITIZED RING-SPLITTING AND ISOMERIZATION REACTIONS OF 1,2-DIPHENYLCYCLOBUTANE BY AROMATIC NITRILES. A POSSIBLE PROBE FOR RELATIONSHIPS BETWEEN REACTIVITIES AND ELECTRONIC NATURE OF EXCIPLEX INTERMEDIATES
Authors: Pac Chyongjin , Fukunaga Takao , Ohtsuki Tomohito , Sakurai Hiroshi
Published: July 2006

The photosensitized reactions of cis-1,2-diphenylcyclobutane by 1,4-dicyanonaphthalene and 9,10-dicyanoanthracene gave styrene, the trans isomer, and 1-phenyltetralin whereas the photosensitization by 1-cyanonaphthalene effected the ring-splitting and cis,trans-isomerization reactions without the formation of 1-phenyltetralin. Similar reactions of the trans isomer were photosensitized by the aromatic nitriles though the trans,cis isomerization did not occur. Features of the reactions were discussed in terms of exciplex intermediates of different charge-transfer and excitation-resonance contributions.
IN VITRO CONVERSION OF HUMULENE TO (±)-PENTALENOLACTONE G, H, AND PENTALENOLACTONE
Authors: Ohtsuka Toshikazu , Shirahama Haruhisa , Matsumoto Takeshi
Published: July 2006

Pentalenolactone (PL), PLH, and PLG were derived from 3,6-epoxy -3,6-seco-7(13)-protoilluden-10-ol which in turn was obtained from humulene. Conformation of PL’s was studied by NMR.
THE BROMINATION OF METHYLARENES WITH NBS BY IRRADIATION USING A TUNGSTEN LAMP. PREPARATION OF BENZOTRIBROMIDES
Authors: Mataka Shuntaro , Kurisu Masayoshi , Takahashi Kazufumi , Tashiro Masashi
Published: July 2006

Bromination of toluene and its meta- and para-substituted derivatives with NBS by irradiation using a tungsten lamp gave benzotribromides and cis- and trans-1,2-dibromo-1,2-diarylethylenes, while ortho-substituted toluenes gave benzal bromides. o-Xylene gave tetra- and pentabromides and m-xylene afforded a mixture of dibromodiarylethylenes.
PREPARATION OF OPTICALLY ACTIVE 1,6,12c,12d-TETRAMETHYL-12c,12d-DIHYDROCORONENE WITH KNOWN ABSOLUTE CONFIGURATION
Authors: Yamamoto Koji , Ueda Tatsuo , Yumioka Hiriya , Okamoto Yoshio , Yoshida Toshikatsu
Published: July 2006

Starting from (M)-(−)-dibromopentahelicene derivative, the novel optically active dihydrocoronene with known absolute configuration was synthesized.
A NEW AND CONVENIENT SYNTHESIS OF ARYL-SUBSTITUTED BUTATRIENES USING NICKEL-CATALYZED COUPLING OF ARYL-SUBSTITUTED 1,1-DIBROMOETHENES
Authors: Iyoda Masahiko , Sakaitani Masahiro , Miyazaki Tatsuya , Oda Masaji
Published: July 2006

The reactions of aryl-substituted 1,1-dibromoethenes with in situ generated tetrakis(triphenylphosphine)nickel(0) in the presence of tetraethylammonium iodide give aryl-substituted butatrienes.
Rh(I) CATALYZED CYCLOREVERSION OF TRISHOMOCUBANONES
Authors: Ogino Toshio , Awano Kazuyuki , Ogihara Tsutomu , Isogai Koji
Published: July 2006

Two types of trishomocubanones, pentacyclo[5.4.0.02,6.03,10.04,8]undecan-11-ones and pentacyclo[5.4.0.2,60.3,10O.5,8]undecan-9-ones are catalytically cycloreverted by [Rh(CO)2Cl]2 in different cleavage modes. The mechanism is discussed on the basis of a kinetic study.
VAPOR PHASE CARBONYLATION OF METHANOL WITH SOLID ACID CATALYSTS
Authors: Fujimoto Kaoru , Shikada Tsutomu , Omata Kohji , Tominaga Hiro-o
Published: July 2006

Vapor phase carbonylation of methanol was catalyzed by strong solid acids in the absence of halogen promoter under pressurized conditions. Methyl acetate, methyl formate and acetic acid were obtained as carbonylated product with dimethyl ether as main by product. Hydrocarbons were also formed at high temperature.
DIASTEREOFACE-DIFFERENTIATING ADDITION OF ORGANOMETALLICS TOWARD CHIRAL α-KETOENAMINES
Authors: Fujisawa Tamotsu , Watanabe Makoto , Sato Toshio
Published: July 2006

The diastereoface-differentiating reaction of Grignard reagents or organolithium reagents toward chiral cyclic α-ketoenamines, prepared from the corresponding cycloalkane-1,2-dione and optically active pyrrolidine derivatives, was found to give, after hydrolysis, (R)- or (S)-α-hydroxycycloalkanones, respectively, in high enantiomeric excess.
PREPARATION OF DURABLE MODIFIED RANEY NICKEL CATALYST (MRNi)
Authors: Tai Akira , Tsukioka Kazumasa , Ozaki Hiroshi , Harada Tadao , Izumi Yoshiharu
Published: July 2006

A new type of asymmetrically modified Raney nickel catalyst with high durability has been prepared by treating the Raney nickel modified with tartaric acid and NaBr with a small amount of amine. The resulting catalyst showed high enantioface-differentiating ability and hydrogenation activity even after repeated uses of ten times upon the hydrogenation of methyl acetoacetate to methyl 3-hydroxybutyrate.
MUTUAL OPTICAL RESOLUTION OF BIS-β-NAPHTHOL AND SULFOXIDES. ABSOLUTE CONFIGURATION AND CRYSTAL STRUCTURE OF A 1:1 MOLECULAR COMPLEX
Authors: Toda Fumio , Tanaka Koichi , Mak Thomas C W
Published: July 2006

X-Ray analysis of a 1:1 complex of (R)-(+)-bis-β-naphthol with (R)-(+)-methyl m-tolyl sulfoxide has established the absolute configuration and showed that the two molecular components are alternately linked by O–H···O hydrogen bonds to form infinite zigzag chains parallel to the a axis. The bis-β-naphthol molecule adopts a cisoid conformation with a torsion angle of −78,2(2)° about the C–C bond joining the aromatic rings.
SINGLE CRYSTALS OF TOTALLY SYNTHETIC AMPHIPHILES, DIALKYLDIMETHYLAMMONIUM BROMIDES
Authors: Okuyama Kenji , Soboi Yoshie , Hirabayashi Kiyoshi , Harada Akira , Kumano Atsushi , Kaziyama Tisato , Takayanagi Motowo , Kunitake Toyoki
Published: July 2006

It has been shown by optical microscopy and X-Ray diffraction method that dimethylammonium bromides having two long alkyl chains (n=16, 18) form single crystals. This finding is the first example of the formation of single crystals of totally synthetic amphiphiles. The unit cell dimensions of the crystals of these compounds were similar to one another.
HIGHLY SELECTIVE OXIDATION OF BENZYLIC ALCOHOLS WITH CETYLTRIMETHYLAMMONIUM PERMANGANATE
Authors: Rathore R , Bhushan Vidya , Chandrasekaran S
Published: July 2006

Cetyltrimethylammonium permanganate (CTAP) has been found to be a mild and highly selective reagent for the oxidation of benzylic alcohols to the corresponding aldehydes or ketones.
CRYSTAL STRUCTURE AND ELECTRICAL CONDUCTIVITY OF A NEW CONDUCTING BISDITHIOLATE COMPLEX Li0.5[Pt(mnt)2]·2H2O
Authors: Kobayashi Akiko , Sasaki Yukiyoshi , Kobayashi Hayao , Underhill Allan E , Ahmad Munir M
Published: July 2006

The X-ray crystal structure analysis of Li0.5[Pt(mnt)2]·2H2O (mnt= 1,2-dicyanovinylene-1,2-dithiolato, C4N2S22−) has revealed that the [Pt(mnt)2]0.5− anions are stacked face-to-face along the a-axis to form a fourfold platinum chain. In contrast to the regular chain in the metallic compound Li0.8[Pt(mnt)2]·2H2O, the fourfold structure can be regarded as a Peierls insulating structure. The room temperature conductivity is about 1 S cm−1.
ISOLATION AND STRUCTURES OF TWO NEW p-HYDROXYSTYRENE GLYCOSIDES, PTELATOSIDE-A AND PTELATOSIDE-B FROM BRACKEN, PTERIDIUM AQUILINUM VAR. LATIUSCULUM, AND SYNTHESIS OF PTELATOSIDE-A
Authors: Ojika Makoto , Wakamatsu Kazumasa , Niwa Haruki , Yamada Kiyoyuki , Hirono Iwao
Published: July 2006

Two new p-hydroxystyrene glycosides, ptelatoside-A and ptelatoside-B were isolated from the carcinogenic fraction of aqueous extracts of bracken, Pteridium aquilinum var. latiusculum, and their structures were established to be p-β-primeverosyloxystyrene and p-β-neohesperidosyloxystyrene, respectively by chemical and spectral means. A synthesis of ptelatoside-A was achieved.
HIGHLY EFFICIENT ASYMMETRIC SYNTHESIS OF (S)-2,2-DIMETHYL-1,3-DIOXOLANE-4-METHANOL FROM GLYCEROL
Authors: Mukaiyama Teruaki , Tanabe Yoo , Shimizu Makoto
Published: July 2006

(S)-2,2-Dimethyl-1,3-dioxolane-4-methanol was prepared from glycerol in high yield with high optical purity by simple procedure. The procedure involves acylation of cyclic tin(IV) alkoxide with an optical active acid chloride in the crucial step.
A NEW METHOD FOR SYNTHESIS OF RUTHENIUM(III) AND RUTHENIUM(II) COMPLEXES OF β-DIKETONES FROM “RUTHENIUM BLUE” SOLUTION
Authors: Endo Akira , Shimizu Kunio , Satô Gen P , Mukaida Masao
Published: July 2006

The blue solution obtained by reducing hydrated ruthenium(III) trichloride with ethanol is used as a convenient starting material in the synthesis of several tris(β-diketonato)ruthenium(III) and tris(β-diketonato)ruthenate(II) complexes. The Hammett constants of the substituents on the ligand serve as a helpful guide for choosing the operating conditions.
2-CHLORO-1,3-BUTADIENE AS AN EFFICIENT ENOPHILE IN THE DIELS–ALDER REACTION WITH ANTHRACENE-1,4,9,10-TETRAONE. A SIMPLE SYNTHESIS OF THE 4-DEMETHOXYANTHRACYCLINONE INTERMEDIATE
Authors: Kimura Yoshikazu , Suzuki Michiyo , Matsumoto Teruyo , Abe Rumiko , Terashima Shiro
Published: July 2006

Diels-Alder reaction of 2-chloro-1,3-butadiene with anthracene-1,4,9,10-tetraone was found to occur exclusively at the external(C2,3) double bond, giving the adduct in an excellent yield. The adduct was readily converted to the 4-demethoxyanthracyclinone intermediate, (±)-7-deoxy-4-demethoxydaunomycinone, by way of 5,12-dihydroxy-l,2,3,4-tetrahydronaphthacene-2,6,11-trione.
ION-EXCHANGE PROPERTIES OF COPRECIPITATED SILICA-TITANIA GEL FOR ALKALI METAL IONS
Authors: Kaneko Shoji , Tsukamoto Kazuyoshi
Published: July 2006

Silica-titania gel of mole ratio 3:1 prepared by a coprecipitation method was found to exhibit excellent cation-exchange abilities, which were enhanced by the pretreatment with HCl and the heat treatment at 200 °C, as compared with silica or titania gel. Separation of cesium from sodium in aqueous solution with the silica-titania gel was complete.
TOTAL SYNTHESIS OF (−)-SWAINSONINE, AN α-MANNOSIDASE INHIBITOR ISOLATED FROM SWAINSONA CANESCENS
Authors: Suami Tetsuo , Tadano Kin-ichi , Iimura Youichi
Published: July 2006

The alkaloidal toxin, (−)-swainsonine: (1S,2R,8R,8aR)-1,2,8-trihydroxyoctahydroindolizine has been synthesized stereoselectively starting from methyl 3-acetamido-2,4,6-tri-O-acetyl-3-deoxy-α-d-mannopyranoside in a 15 steps reaction.
REVERSIBLE PHOTODIMERIZATION OF WATER-SOLUBLE ANTHRACENES INCLUDED IN γ-CYCLODEXTRIN
Authors: Tamaki Takashi
Published: July 2006

Anthracene-1- or 2-sulfonic and 2-carboxylic acids were found to form one host-two guest inclusion complexes with γ-cyclodextrin in aqueous solutions. The complex formation greatly enhanced the photodimerization of these anthracenes.
CYCLIZATION OF E,E-HOMOFARNESIC ACID AND ITS RELATED COMPOUNDS
Authors: Saito Akira , Matsushita Hajime , Kaneko Hajime
Published: July 2006

Acid-catalyzed cyclization of homofarnesic acid was examined in detail. E,E- and Z,E-homofarnesic acid in dichloromethane cyclyzed by catalysis of boron trifluoride etherate at −20°C to afford trans-anti-trans and trans-syn-cis norambreinolide in 38% and 52% yield respectively. Cyclization mechanism was discussed.
(+)-ACETOXYODONTOSCHISMENOL, A NEW DOLABELLANE DITERPENOID FROM THE LIVERWORT ODONTOSCHISMA DENUDATUM
Authors: Matsuo Akihiko , Uohama Katsumi , Hayashi Shtûchi , Connolly Joseph D
Published: July 2006

A new dolabellane diterpenoid, (+)-acetoxyodontoschismenol, displaying antifungal properties, has been isolated from the liverwort Odontoschisma denudatum, and its structure, including the absolute configuration, has been determined as (1R,6R,11R,12S)-6-acetoxy-12-hydroxydolabella-3E,7E-diene on the basis of the chemical and spectroscopic evidence.
REACTION OF DIPHOSPHENES WITH ELEMENTAL SELENIUM. ISOLATION AND CHARACTERIZATION OF SELENADIPHOSPHIRANES AND DISELENOXOPHOSPHORANE
Authors: Yoshifuji Masaaki , Shibayama Katsuhiro , Inamoto Naoki
Published: July 2006

Sterically protected thermally stable 1,2,3-selenadiphosphirane and diselenoxophosphorane were isolated from the reaction of E-bis-(2,4,6-tri-t-butylphenyl) diphosphene with elemental selenium.
LIGHT-INDUCED FIXATION OF CARBON DIOXIDE WITH ZINC PORPHYRIN
Authors: Inoue Shohei , Nukui Masahiro , Kojima Fumitoshi
Published: July 2006

N-Methyltetraphenylporphinatozinc ethyl reacts with carbon dioxide in the presence of secondary amine or alcohol to form novel metalloporphyrins containing metal carbamate or carbonate group. Some of these reactions are accelerated remarkably upon irradiation with visible light.
OXIDATION OF AZULENE DERIVATIVES. AUTOXIDATION OF 4,6,8-TRIMETHYLAZULENE IN A POLAR APROTIC SOLVENT
Authors: Matsubara Yoshiharu , Takekuxma Shin-ichi , Yokoi Katsumi , Yamamoto Hiroshi , Nozoe Tetsuo
Published: July 2006

Autoxidation of 4,6,8-trimethylazulene at 120 °C in N,N-dimethylformamide yielded twelve separable products (including four known compounds), which were assigned to be azulenoquinone, inden-1-one, and azulenyl-1-indanone derivatives. A comparison of the present results with those of guaiazulene was made to obtain a mechanistic aspect of the oxidation reaction.
SUBSTITUTION OF ALKYL AND HYDROXYALKYL GROUP FOR RING HYDROGEN AND OF HYDROXYALKYL GROUP FOR CYANO GROUP IN GAMMA-IRRADIATION OF PYRIDINECARBONITRILES IN ALCOHOL
Authors: Sugimori Akira , Mori Shoji , Maeda Kazuo , Nishijima Masayuki
Published: July 2006

Gamma-irradiation of pyridinecarbonitriles in alcohol in the presence of sulfuric acid brings about the substitution of the alkyl group derived from alcohol for the ring hydrogen, while that in the absence of sulfuric acid causes the substitution of hydroxy-alkyl group for CN at the 2- and 4-positions. Hydroxyalkyl radicals and solvated electrons play important role in the substitution.
ACID-BASE INTERACTION IN THE COMPLEXATION WITH A NICOTINOYL FUNCTIONALIZED CYCLODEXTRIN
Authors: Goren Zafrir , Dan Phyllis , Willner Itamar
Published: July 2006

Association of p-nitrothiphenol to a nicotinoyl functionalized α-cyclodextrin, is 5-fold enhanced as compared with its binding to nonfunctionalized α-cyclodextrin. This enhancement is attributed to an acid-base interaction operative in the association process.
N2-HYDROGENATION ON SOLID SURFACE WITH GLOW DISCHARGE
Authors: Miyahara Koshiro
Published: July 2006

The steady and selective N2-hydrogenation to hydrazine on solid surface was performed at room temperature by the use of glow discharge of N2 gas over higher hydrocarbon film held on solid surface. Formation of ammonia from H2/N2 mixture was found to be due to the simple wall effect of solid surface on the plasma.
FLOW INJECTION ANALYSIS WITH AMPEROMETRIC DETECTOR UTILIZING THE REDOX REACTION OF IODATE ION
Authors: Ikeda Sanae , Satake Hiromu , Kohri Yasuyuki
Published: July 2006

A flow injection method for the determination of oxidizable compounds was developed by utilizing the redox reaction of iodate ion with the sample. Decrease of iodate ion concentration was monitored by measuring its reducing current at a platinum wire electrode held at +0.6 V vs. a silver tubing electrode. Furthermore, L-ascorbic acid, hydrazine and L-cysteine could be determined continuously by using only a hydrazine calibration curve in the concentration range 10−4–10−3 mol dm−3 with 20 μl samples.
REACTION OF 3,3,3-TRIFLUOROPROPENE WITH BENZENE OVER Al2O3 TREATED WITH CF3Cl
Authors: Takusari Hisanori , Okazaki Susumu
Published: July 2006

The reaction between 3,3,3-trifluoropropene and benzene in a vapor phase was carried out over various Al2O3. Trifluoropropylbenzene was obtained selectively when CF3Cl-treated Al2O3 was used as a catalyst.
METAL-CATALYZED REARRANGEMENT OF PHENYLATED BIS-HOMOCUBANE
Authors: Yokoyama Kinichi , Saegusa Yumi , Miyashi Tsutomu , Kabuto Chizuko , Mukai Toshio
Published: July 2006

The reaction of the phenylated bis-homocubane with Fe(III) exclusively afforded the [2+2]cycloreversion product (6), whereas that with Ag(I) gave 6 together with the skeletal rearranged snoutane derivative.
PERMEATION PROPERTY OF BUILT-UP THIN FILM OF ARTIFICIAL LIPID WITH HYDROPHILIC AND HYDROPHOBIC SURFACES
Authors: Kajiyama Tisato , Kumano Atsushi , Takayanagi Motowo , Kunitake Toyoki
Published: July 2006

Artificial lipid was spread on water surface as a monomolecular layer and the monolayer was built up on the polymeric film. The built-up film was formed by the bimolecular layer structure and exhibited the crystal-liquid crystal phase transition. In the case of the built-up film with the hydrophilic surface contacting with a salt solution, the diffusive permeability coefficient, P of K+ ion increased discontinuously about 100 times over the range of crystal-liquid crystal phase transition temperature, Tc. In the case of that with the hydrophobic surface, the slope of the P vs. 1/T plot increased with a break at Tc.
PHOTOCHEMICAL 2+2 CYCLOADDITION OF 2-CHLORO-1,4-NAPHTHOQUINONE TO ALKENES. A NOVEL SYNTHESIS OF 1,2-DIHYDROCYCLOBUTA[b]NAPHTHALENE-3,8-DIONES
Authors: Naito Toshihiko , Makita Yoshihiko , Kaneko Chikara
Published: July 2006

2-Chloro-1,4-naphthoquinone undergoes photochemical 2+2 addition at its 2- and 3-positions to alkenes. An elimination of hydrogen chloride from the adducts provides a facile and general synthetic method of 1,2-dihydrocyclobuta[b]naphthalene-3,8-diones.
KINETIC AND THERMODYNAMIC CONTROL OF ASYMMETRIC INDUCTION BY CHIRAL DIPHOSPHINE IN RING CONTRACTION OF (CHIRAL DIPHOSPHINE)NiCH2CH2CH2COO TO (CHIRAL DIPHOSPHINE) NiCH (CH3)CH2COO
Authors: Sano Kenji , Yamamoto Takakazu , Yamamoto Akio
Published: July 2006

An (S,S)-CHIRAPHOS-coordinated six-membered ring complex NiCH2CH2CH2COO undergoes facile ring contraction to give a mixture of ((S,S)-CHIRAPHOS)-(R)-NiCH(CH3)CH2COO (2a) and ((S,S)-CHIRAPHOS)-(S)-NiCH(CH3)CH2COO (2b). Complex 2a is kinetically favored, whereas 2b is thermodynamically favored; a thermodynamically equilibrated mixture contains 2b in 54% de.
SYNTHESIS OF DOUBLE FITS REAGENTS
Authors: Umemoto Teruo , Nakamura Takehiko
Published: July 2006

Perfluoroalkylene bisaryliodonium triflates(D-FITS) were synthesized as useful agents for introduction of perfluoroalkylene groups.
RATES OF DISSOCIATION OF N-(1,3-DITHIOLAN-2-YL)PYRIDINIUM PERCHLORATE IN POLAR APROTIC SOLVENTS
Authors: Oki Michinori , Morita Toshiari
Published: July 2006

Rates of dissociation of the C–N bond in the title compound have been obtained by the dynamic NMR technique. The barriers to dissociation are 16.4 and 16.5 kcal/mol at 273 K in CD3CN and CD3NO2, respectively.
STRUCTURAL STUDY OF POLY(CARBON DISELENIDE)
Authors: Kobayashi Akiko , Sasagawa Nobuyoshi , Sasaki Yukiyoshi , Asakura Kiyotaka , Yokoyama Toshihiko , Ishii Hiromu , Kosugi Nobuhiro , Kuroda Haruo , Kobayashi Hayao
Published: July 2006

Poly(carbon diselenide) is metallic in an ordered crystalline state and it becomes less conductive when crystalline imperfection increases. EXAFS spectra show the existence of Se–Se bonds and the co-ordination number of Se in metallic poly(carbon diselenide) is almost 2.0, indicating the infinite chains of Se atoms. Extended Huckel calculation gave a reasonable interpretation of the metallic nature of crystalline poly(carbon diselenide).
A TWO-STEP MECHANISM FOR THE INCLUSION REACTIONS OF α-CYCLODEXTRIN WITH MONO ALKYL-SUBSTITUTED HYDROXYPHENYLAZO DERIVATIVES OF SULFANILIC ACID
Authors: Seiyama Akitoshi , Yoshida Noboru , Fujimoto Masatoshi
Published: July 2006

Kinetic studies on the inclusion reactions of the title azo compounds with α-cyclodextrin (α-CDx) in aqueous solution by means of the stopped-flow method reveal a two-step inclusion mechanism involving a fast binding process of the guest compounds to α-CDx followed by the slow intramolecular transformation of the intermediate inclusion complex. Activation parameters for each step were determined.
PHOTOISOMERIZATION OF 7-SUBSTITUTED NORBORNADIENE-CYCLODEXTRIN INCLUSION COMPLEXES
Authors: Yumoto Takaari , Hayakawa Kiyoshi , Kawase Kaoru , Yamakita Hiromi , Taoda Hiroshi
Published: July 2006

The photoisomerization of 7-substituted norbornadiene-cyclodextrin inclusion complexes, in which the substituents are t-butoxyl, acetoxyl, and hydroxyl groups, gave 7-substituted quadricyclene-cyclodextrin inclusion complexes.
REGIOSELECTIVE CYCLOADDITION REACTIONS OF ALLYLSILANES AND SILYL ENOL ETHERS WITH NITRONES AND NITRILE OXIDES. SYNTHESIS OF HOMOALLYLAMINES
Authors: Hosomi Akira , Shoji Hiroaki , Sakurai Hideki
Published: July 2006

Allylsilanes and silyl enol ethers add to nitrones and nitrile oxides regioselectively to give the corresponding isoxazolidines and isoxazolines in good yield. Hydrogenative cleavage of the N–O bond of [3 + 2] cycloadducts with allylsilanes affords homoallylamines. In contrast, cyanosilane reacts smoothly with nitrones in a 1,3-conjugate mode.
1H-ENDR OF DI-t-BUTYL NITROXIDE EFFECT OF THE 14N HYPERFINE INTERACTION
Authors: Yamauchi Jun , Deguchi Yasuo
Published: July 2006

ENDOR spectra of di-t-butyl nitroxide have been observed at −90 °C in heptane. Two ENDOR lines near the free proton frequency had different absorption intensities and their line-shape showed a clear dependence on the nitrogen spin quantum number. This indicates an important spin cross relaxation by the nitrogen nucleus in the proton spin system and suggests a negative sign of the proton hyperfine coupling constant.
INFLUENCE OF CYCLODEXTRINS ON THE SODIUM BOROHYDRIDE REDUCTION OF CYCLOHEXENONES
Authors: Chênevert Robert , Chamberland Daniel
Published: July 2006

The sodium borohydride reduction of cyclohexenones in aqueous medium is changed in the presence of cyclodextrins. β-cyclodextrin favours the 1,4-reduction over the 1,2-reduction whereas α-cyclodextrin favours the 1,2-reduction.
STEREOCONTROLLED SYNTHESIS OF TRICYCLO[6.2.1.04.9]UNDECANE RING SYSTEM OF ACONITIUM ALKALOIDS
Authors: Ihara Masataka , Ishida Yohhei , Abe Mariko , Toyota Masahiro , Fukumoto Keiichiro , Kametani Tetsuji
Published: July 2006

Intramolecular double Michael reaction of the α,β-unsaturated enone ester gave the tricyclo[ 5.2.2.01,5]undecane derivative, which was stereoselectively converted into the tricyclo[6.2.1.04,9]undecane derivative.
SYNTHESIS OF HEXAACETYLTETRAHYDROAUCUBIN A
Authors: Obara Heitaro , Kimura Hiroshi , Tanaka Yasuhiko
Published: July 2006

The synthesis of hexaacetyltetrahydroaucubin A, (1S,4aR,5R,7S,7aR)-5-acetoxy-7-acetoxymethyl-1-(2,3,4,6-tetraacetyl-β-d-glucopyranosyloxy)octahydrocyclopenta[c]pyran, has been carried out.
PREPARATION AND PROPERTIES OF INCLUSION COMPOUNDS OF (η6-ARENE)TRICARBONYLCHROMIUM(0) COMPLEXES WITH CYCLODEXTRINS
Authors: Harada Akira , Saeki Kohji , Takahashi Shigetoshi
Published: July 2006

One-to-one inclusion compounds were obtained in high yields by the treatment of β- and γ-cyclodextrin(CD) with (η6-arene)tricarbonylchromium(0) complexes; the formation of inclusion compounds is selective.
BREAKDOWN LUMINESCENCE OF PURE AND COBALT-DOPED ZnO ELECTRODES IN SUPPORTING ELECTROLYTE UNDER PULSED ANODIC EXCITATION
Authors: Fichou Denis , Kossanyi Jean
Published: July 2006

An intense breakdown current occurs at 9.7 V vs. SCE with pure (ND=5×1018 cm−3) and Co-doped n-ZnO electrodes in supporting electrolyte. A simultaneous light emission is observed, extending over the visible and near IR regions, which decays in 1 and 30 ms respectively. The exp (−bxV1⁄2) potential dependence of the electroluminescence intensity suggests an impact-ionization mechanism.
HIGHLY ENANTIOSELECTIVE SYNTHESIS OF ANTI(THREO)-ALDOLS BY THE ASYMMETRIC ALDOL REACTION UTILIZING A CHIRAL AZAENOLATE
Authors: Narasaka Koichi , Miwa Tetsuo
Published: July 2006

Diastereo- and enantioselective aldol reaction between 3-pentanone and aldehydes is achieved utilizing a chiral oxazolidine derived from 3-pentanone and chiral norephedrine. The reaction of a tin(II) azaenolate generated from the chiral oxazolidine with aldehydes affords predominantly anti(threo)-aldols of high enantiomeric purity.
A NOVEL AND USEFUL METHOD FOR THE PREPARATION OF METHYL ESTERS FROM DIMETHYL ACETALS
Authors: Mukaiyama Teruaki , Kato Jun-ichi , Miyoshi Norikazu , Iwasawa Nobuharu
Published: July 2006

In the presence of a catalytic amount of trityl perchlorate, acetal-type peroxides are successfully prepared from dimethyl acetals and t-butyl trimethylsilyl peroxide in good yields. The peroxides thus obtained are converted to the corresponding methyl esters also in good yields.
APPLICATION OF OPTICALLY ACTIVE ORGANOSILANE TO THE DETERMINATION OF OPTICAL PURITIES OF AMINES, ALCOHOLS, AND CARBOXYLIC ACIDS
Authors: Terunuma Daiyo , Kato Masato , Kamei Masanao , Uchida Hidekatsu , Nohira Hiroyuki
Published: July 2006

Application of optically active carbonfunctional organosilanes for the determination agent of optical purities of chiral amines, alcohols, and carboxylic acids by using NMR spectrometer were investigated.
IMMOBILIZED CATALYST DIRECTED TO SYNTHETIC CONTROL. CROSS-ALDOL REACTION
Authors: Mukaiyama Teruaki , Iwakiri Hiroshi
Published: July 2006

Cross-aldol adducts are stereoselectively formed in good yields by treating acetals or aldehydes and silyl enol ethers in a heterogeneous system with a catalytic amount of polymer-supported trityl perchlorate.
ASYMMETRIC SYNTHESES OF (5R,6R)-AEGINETOLIDE AND (5R)-DIHYDROACTINIDIOLIDE FROM (R)-2-HYDROXY-2-METHYLCYCLOHEXANONE
Authors: Sato Toshio , Funabora Makoto , Watanabe Makoto , Fujisawa Tamotsu
Published: July 2006

C11-Cyclic terpenes, (5R,6R)-(−)-aeginetolide and (5R)-(−)-dihydroactinidiolide have been synthesized stereoselectively starting from (R)-2-hydroxy-2-methylcyclohexanone in short steps.
FRIEDEL–CRAFTS REACTION OF 3,6-DIHYDRO-4-METHYL-2H-PYRAN WITH PHENOLS. A CONVENIENT SYNTHESIS OF A KEY INTERMEDIATE OF ALPHA-TOCOPHEROL
Authors: Fujita Yoshiji , Shiono Manzo , Ejiri Katsushi , Saita Kazumi
Published: July 2006

The Friedel–Crafts reaction of 3,6-dihydro-4-methyl-2H-pyran with 2,3,5-trimethylhydroquinone afforded 3,4-dihydro-6-hydroxy-2,5,7,8-tetramethyl-2H-1-benzopyran-2-ethanol in good yield.
ZINC SULFIDE-CATALYZED PHOTOCHEMICAL CONVERSION OF PRIMARY AMINES TO SECONDARY AMINES
Authors: Yanagida Shozo , Kizumoto Hirotoshi , Ishimaru Yoshiteru , Pac Chyongjin , Sakurai Hiroshi
Published: July 2006

Nonmetallized ZnS catalizes efficiently the photochemical conversion of primary amines to secondary amines with liberation of ammonia under irradiation of the UV light of λ>290 nm. The conversion is interpreted as due to the two-hole-oxidation of primary amines to Schiff bases and their two-electron-reduction to secondary amines by the photogenerated electrons in ZnS.
PHOTOCHEMICALLY-INDUCED ASYMMETRIC MEMBRANE POTENTIAL ACROSS POLY(VINYL CHLORIDE)/SPIROBENZOPYRAN MEMBRANES
Authors: Anzaki Jun-ichi , Sasaki Hiroshi , Ueno Akihiko , Osa Tetsuo
Published: July 2006

The membrane potential across poly(vinyl chloride)/spirobenzopyran (1) membrane changed reversibly by UV and visible light irradiation even when no concentration gradient of electrolyte existed between two external solutions separated by the membrane. The photoresponse of the membrane potential strongly depended on the 1 content of the membranes. The results are explained in terms of formation of asymmetric membrane, namely the opened-1: closed-1 ratios of the two surfaces of the membrane were different from each other under UV light.
SYNTHESIS AND PROPERTIES OF 7-(2,3-DIPHENYLCYCLOPROPENYLIDENE)-1,6-METHANO-2(7H)-[10]ANNULENONE. A [3.10]QUINAREN-5-ONE DERIVATIVE HAVING POLYOLEFINIC CHARACTER
Authors: Takahashi Kazuko , Ohnishi Keiichi , Takase Kahei
Published: July 2006

The title quinarenone 2 in which the electron donating and electron accepting groups are located at the separate sites bisected by the 1,6-methano bridge, has been prepared. This compound has a preferable contribution of quinonoid resonance structure 2a to dipolar structure 2b in the ground state in order to maintain the weak conjugation between the two terminal chromophores, steming the C-1,6 overlap.
THE HIGHLY REGIOSELECTIVE COUPLING REACTION OF ALLYLIC ALCOHOLS WITH LITHIUM ENOLATE OF DITHIOESTERS USING 1-CHLORO-2-METHYL-N,N-TETRAMETHYLENEPROPENYLAMINE
Authors: Fujisawa Tamotsu , Umezu Kazuto , Sato Toshio
Published: July 2006

1-Chloro-2-methyl-N,N-tetramethylenepropenylamine was found to be a good condensation reagent for the regioselective coupling reaction of allylic alcohols with lithium enolate of dithioesters under mild conditions to afford γ,δ-unsaturated dithioesters, which proceeds by a thio-Claisen rearrangement of S-allylic ketene dithioacetals initially formed.
DIASTEREOSELECTIVE SYNTHESIS OF 2-HYDROXY-3,4-ALKADIENOIC ACIDS BY THE ESTER ENOLATE CLAISEN REARRANGEMENT OF PROPARGYL GLYCOLATES
Authors: Fujisawa Tamotsu , Maehata Eisaku , Kohama Hiromasa , Sato Toshio
Published: July 2006

The ester enolate Claisen rearrangement of propargyl glycolates gave 2-hydroxy-3,4-alkadienoic acids with high diastereoselectivity, which was confirmed by stereospecific transformation of the acids into dihydrofuranmethanols.
AN EFFICIENT METHOD FOR SYNTHESIS OF 1-CYANO-2-SUBSTITUTED-ISOINDOLES BY STRECKER REACTION USING o-PHTHALALDEHYDE AND PRIMARY AMINES
Authors: Takahashi Kazumasa , Suenobu Kazuhiko , Ogura Katsuyuki , Iida Hirotada
Published: July 2006

An efficient sequence proposed here provides a new synthetic method for preparation of 1-cyano-2-substituted-isoindoles by Strecker reaction using o-phthalaldehyde and primary amines.
FACILE REDUCTION OF ORGANIC HALIDES AND PHOSPHINE OXIDES WITH LiAlH4–CeCl3
Authors: Imamoto Tsuneo , Takeyama Toshiaki , Kusumoto Tetsuo
Published: July 2006

A new reagent system, LiAlH4–CeCl3, exhibits powerful and characteristic reducing ability. Organic halides including fluorine compounds are smoothly dehalogenated with this reagent. Phosphine oxides are also reduced to phosphines in excellent yields.
A NOVEL SYNTHESIS OF PSEUDO-α-l-ALTROPYRANOSE FROM d-GLUCOSE
Authors: Suami Tetsuo , Tadano Kin-ichi , Ueno Yoshihide , Fukabori Chiyoko
Published: July 2006

(1R,6R,8R,9R)-8,9-Isopropylidenedioxy-3-oxo-7-oxabicyclo[4.3.0]non-4-ene, a highly functionalized bicyclic compound, has been synthesized from d-glucose employing an intramolecular aldol condensation as the key reaction, and a transformation of it into pseudo-α-l-altropyranose was achieved efficiently.
STEREOCHEMISTRY OF AMINE-CATALYZED KNOEVENAGEL REACTIONS
Authors: Tanikaga Rikuhei , Konya Naoto , Kaji Aritsune
Published: July 2006

The amine-catalyzed Knoevenagel reactions of aldehydes and active methylene compounds containing two activating groups were found to involve many reversible steps, and the diastereomeric intermediary condensation compounds yielded thermodynamically stable products via carbanionic intermediates stabilized and sterically affected by two activating groups.
EOSIN Y-SENSITIZED CHEMILUMINESCENCE OF 7,7,8,8-TETRACYANOQUINODIMETHANE IN SURFACTANT VESICLES FOR DETERMINATION OF MANGANESE(II) AT SUB-NANOGRAM LEVELS BY FLOW INJECTION METHOD
Authors: Yamada Masaaki , Kamiyama Satoru , Suzuki Shigetaka
Published: July 2006

Luminous oxidation of 7,7,8,8-tetracyanoquinodimethane(TCNQ) by dissolved O2 is utilized for sensitive determination of Mn(II), The weak chemiluminescence of TCNQ is effectively sensitized by eosin Y in didodecyldimethylammonium bromide bilayor vesicles. The limit of determination is 0.01 ng(20-μl sample injection).
HYDROTHERMAL CRYSTAL GROWTH OF CALCITE IN NaCl AND KCl SOLUTIONS
Authors: Hirano Shin-ichi , Kikuta Ko-ichi
Published: July 2006

Hydrothermal growth of calcite single crystal was studied by using NaCl and KCl solutions which have been considered to be naturally existing as the saline mineralizer. Both of NaCl and KCl solutions were found to be the effective mineralizer for the growth of calcite crystal of optical grade. Optically clear single crystals of calcite could be grown from each chloride solution.
ASYMMETRIC RING-OPENING OF CYCLOHEXENE OXIDE WITH VARIOUS THIOLS CATALYZED BY ZINC Lq-TARTRATE
Authors: Yamashita Hiroyuki , Mukaiyama Teruaki
Published: July 2006

Optically active trans-2-(arylthio or alkylthio)cyclohexanols are prepared by the asymmetric ring-opening of cyclohexene oxide with various arylthiols or alkylthiols in 52–85% ee by the use of zinc Lq-tartrate as a heterogeneous chiral Lewis acid catalyst.
PEPTIDE FORMATION FROM AMINO ACID WITH PARTICULATE SEMICONDUCTOR PHOTOCATALYSTS
Authors: Onoe Jun , Kawai Tomoji , Kawai Shichio
Published: July 2006

Peptides of diglycine to pentaglycine are formed from glycine under irradiation in the presence of particulate semiconductor photocatalysts such as TiO2, CdS, CdSe, MOS2, In2O3, and GaP, with and without Pt deposition. Platinization of the semiconductors efficiently enhanced the yield of the peptides.
ENRICHMENT OF NONIONIC SURFACTANTS WITH FLUOROCARBON POLYMER MEMBRANE
Authors: Igawa Manabu , Anzai Tsunehisa , Seno Manabu
Published: July 2006

Nonionic surfactants were enriched by the permeation through a fluorocarbon polymer membrane under a pressure gradient when the concentration of the surfactants were low. The enrichment factor increased with a decrease in the operating pressure and an increase in the lipophilicity of the surfactant.
SYNTHESIS AND REACTIONS OF CYCLIC α-HYDROXY SULFIDES
Authors: Takata Toshikazu , Huang Liren , Ando Wataru
Published: July 2006

Stable, optically active α-hydroxy sulfides are prepared in high yields by reduction of corresponding α-hydroperoxy sulfides obtained by stereospecific photohydroperoxidation of optically active thiazolidine derivatives. A few reactions as well as spectroscopic data characterize the alcohol structure.
CRYSTAL STRUCTURE OF [Et4N]2[Fe4S4(2,4,6-TRIMETHYLBENZENETHIOLATO)4]
Authors: Ueyama Norikazu , Sugawara Takashi , Fuji Michiaki , Nakamura Akira , Yasuoka Noritake
Published: July 2006

The crystal structure of [Et4N]2[Fe4S4(2,4,6-trimethylbenzenethiolato)4] was determined by X-ray diffraction. The complex crystallizes in orthorhombic space group (Pcnb). The Fe4S42+ core of the anion approaches C2 symmetry. The complex has relatively long Fe–S(Ph) bond lengths and small Fe–S–C angles. The results suggest the prevention of π-overlap between Fe(d)-SPh(p) orbitals by the steric hindrance of two methyl groups at o-positions of phenyl group.
THE FREQUENCY DEPENDENCE OF MOTT–SCHOTTKY PLOTS
Authors: Braun Christian M , Fujishima Akira , Honda Kenichi
Published: July 2006

The charging current of the space charge layer of a CdS(0001)/aq. KCl junction was measured by Time Domain Spectroscopy in the short time region. The relaxation spectrum consists of a multitude of exponentials, which is interpreted by a heterogeneous semiconductor surface. This explains the dependence of conventional Mott Schottky plots on frequency and resulting errors in the determination of flatband potential and donor density.
COPPER(I) IODIDE-MEDIATED ARYLATION OF DIALKYL CYANOMETHANEPHOSPHONATES. A NOVEL ROUTE TO α-ARYLATED ALKANENITRILES
Authors: Suzuki Hitomi , Watanabe Kazue , Yi QUI
Published: July 2006

Copper(I)-catalyzed arylation of dialkyl cyanomethanephosphonate anions in hot hexamethylphosphoric triamide affords α-arylalkanenitriles in moderate to good yields.
ELECTRICALLY STIMULATED RELEASE OF NEUROTRANSMITTER FROM A CONDUCTING POLYMER THIN FILM ON THE MODEL OF A SYNAPSE
Authors: Shinohara Hiroaki , Aizawa Masuo , Shirakawa Hideki
Published: July 2006

A microtip of polypyrrole film (50 μm in diameter) was devised on the model of a presynaptic membrane. The microtip incorporated neurotransmitter such as glutamic acid at an electrochemically oxidized state. The incorporated glutamic acid was released from the film on call by electric pulse stimulation.
A CONVENIENT METHOD FOR THE PREPARATION OF 6-PHENOXY-2-PYRIDINECARBALDEHYDE
Authors: Ozawa Kiyomi , Ishii Shigeru , Hatanaka Masataka
Published: July 2006

6-Phenoxy-2-pyridinecarbaldehyde was prepared in good yields through a few reaction steps utilizing Grignard reaction which has been regarded disadvantageous for preparation of pyridinecarbaldehydes.
APPLICATION OF A DUAL-DISC SEMICONDUCTORS TO A LEAN-BURN OXYGEN SENSOR
Authors: Shimizu Yasuhiro , Fukuyama Yoshiki , Arai Hiromichi
Published: July 2006

A lean-burn oxygen sensor composed of two different sintered semiconductors was made by electrically contacting the discs of SrAl0.01Ti0.99O3 and Cr2O3 with Pt mesh by mechanical pressing. The resistance-λ′ characteristic of the connected device was investigated in the exhaust gas of oxygen-propane combustion, where λ′ stands for the oxygen excess ratio. It was found that the SrAl0.01Ti0.99O3Cr2O3 device had promising properties for a lean-burn oxygen sensor, because the device exhibited a large change in the resistance in the lean-burn region with a negligible change in the rich-burn region.
ESR STUDY OF ELECTRONIC EFFECTS AND PREFERRED CONFORMATION OF ALKYL AND SILYL GROUPS ON THE BENZENE CATION RADICAL
Authors: Kira Mitsuo , Nakazawa Hiroko , Sakurai Hideki
Published: July 2006

Cation radicals of several alkyl- and silyl-substituted benzenes in frozen trichlorofluoromethane were investigated by ESR. All the substituents were found to act as an electron donor to the benzene cation, preferring the M–H σ bond eclipsing pπ orbitals. The results may afford a good evidence for the conformational consequences of hyperconjugation.
DITHIOL-FERROUS CHLORIDE CATALYZED SELECTIVE REDUCTION OF ALKYNES WITH SODIUM BOROHYDRIDE
Authors: Kijima Masashi , Nambu Yoko , Endo Takeshi
Published: July 2006

Simple dithiols-ferrous chloride or lipoamide-ferrous chloride were found to be effective catalysts for the selective reduction of substituted alkynes to alkenes with sodium borohydride presumably by forming active dithiol-Fe(II) complexes.
DIVERGENT SOLVENT EFFECTS ON PHOTOSENSITIZED REACTIONS OF cis-1,2-DIPHENYLCYCLOBUTANE BY AROMATIC NITRILES
Authors: Pac Chyongjin , Ohtsuki Tomohito , Fukunaga Takao , Yanagida Shozo , Sakurai Hiroshi
Published: July 2006

Photosensitized reactions of cis-1,2-diphenylcyclobutane by aromatic nitriles, which mainly give styrene along with the trans isomer and 1-phenyltetralin revealed divergent solvent effects depending on the sensitizers.
X-RAY CRYSTAL STRUCTURE OF A 1:1 METHANOL COMPLEX OF WINE CUP-SHAPED HOST COMPOUND N,N,N′,N′,N″,N″-HEXACYCLOHEXYLMETHANE TRICARBOXAMIDE
Authors: Toda Fumio , Khan Mushfiquddin , Mak Thomas C W
Published: July 2006

The title novel wine cup-shaped host molecule was found to include a wide variety of guest compounds, and X-ray crystal structure of its 1:1 methanol complex was determined.
PARTICIPATION OF NONLAMELLAR PHASE IN FUSION OF BILAYER MEMBRANES FORMED WITH SYNTHETIC PEPTIDE LIPIDS
Authors: Murakami Yukito , Kikuchi Jun-ichi , Takaki Toshihiko
Published: July 2006

Participation of the nonlamellar phase in the fusion process of bilayer membranes was examined with an equimolar mixture of sodium N,N-dihexadecyl-Nα-(6-sulfohexanoyl)-l-alaninamide and N,N-dihexadecyl-Nα-[6-(dimethylamino)hexanoyl]-l-alaninamide in aqueous media by means of electron microscopy, differential scanning calorimetry, and turbidity measurements.
REGIOSELECTIVE SULFENYLATION OF OXIME DIANIONS. A NOVEL AND USEFUL METHOD FOR THE REGIOSELECTIVE RING CLEAVAGE
Authors: Hiroi Kunio , Otsuka Masahiko , Sato Shuko
Published: July 2006

Treatment of the dianions of cyclic ketoximes with diphenyl disulfide underwent a regioselective sulfenylation at the syn α-carbons. Regioselective alkylation of cyclic ketoxime dianions, followed by sulfenylation with diphenyl disulfide, produced α-alkyl-α′-phenylsulfenyl ketoximes. A Beckmann fragmentation of these sulfenylated ketoximes gave ring cleaved products. This procedure provides a synthetically useful method for the regioselective ring cleavage, remaining valuable functionalities.
HYDROLIQUEFACTION OF COAL AND HYDROGENATION OF PHENANTHRENE WITH IRON CATALYSTS ACTIVATED BY NEW METHOD
Authors: Ogata Eisuke , Hatakeyama Kazuya , Kamiya Yoshio
Published: July 2006

Iron catalysts obtained by the CO pretreatment of iron oxide and iron ore suspended in hydrocarbon solvents presented high catalytic activities for the hydroliquefaction of coal and hydrogenation of phenanthrene.
REGIOSELECTIVE TRANSFORMATION OF UNSYMMETRICAL BIS(N-NITROSOSULFONAMIDES) LEADING TO OPTICALLY ACTIVE CYCLIC IMINO ACID DERIVATIVES FROM l-LYSINE AND l-ORNITHINE
Authors: Iwata Masaaki , Kuzuhara Hiroyoshi
Published: July 2006

Chiral cyclic imino acid derivatives were prepared from unsymmetrical bis(N-nitrososulfonamides) of diaminocarboxylic acids, l-lysine and l-ornithine, in good yields through kinetically controlled regioselective N-nitrososulfonamide-sulfonate rearrangement.
THREE-DIMENSIONAL INTERMOLECULAR Se···Se NETWORK IN (BEDSe-TSeF)PF6
Authors: Kato Reizo , Kobayashi Hayao , Kobayashi Akiko , Sasaki Yukiyoshi
Published: July 2006

In the crystal of (BEDSe-TSeF)PF6 (space group; C2/m), there exists face-to-face overlap of the BEDSe-TSeF molecules along the c axis. Intermolecular interaction by the short Se···Se contact is also observed in the 〈1,1,2〉 and 〈1,1,4〉 directions, which results in the three-dimensional Se···Se network.
HYDROGENATION OF CO OVER SILICA-SUPPORTED Mo–Ir CATALYSTS
Authors: Kuwahara Yasushi , Hamada Hideaki , Kintaichi Yoshiaki , Ito Takehiko , Wakabayashi Katsuhiko
Published: July 2006

Silica-supported Mo–Ir bimetallic catalysts exhibited much higher activity than the monometallic Mo or Ir catalyst for the hydrogenation of CO at 220–240 °C and 21 atm. Alcohols up to four carbon atoms were found to be produced over the bimetallic catalysts.
PALLADIUM CATALYZED SYNTHESIS OF ALLYLIC SULFONES. UTILIZATION OF α-NITRO OLEFINS AS ALLYLIC NITRO COMPOUNDS
Authors: Tamura Rui , Hayashi Koji , Kakihana Masato , Tsuji Masanori , Oda Daihei
Published: July 2006

α-Nitro olefins reacted with sodium benzenesulfinate in the presence of tertiary amine and palladium(0) catalyst to afford allylic sulfones. The competition experiment showed that relative rate of the sulfonylation of an α-nitro olefin to that of the corresponding allylic acetate was about 2.2.
FLUORINATION BY USE OF TRANSITION METAL FLUORIDE–BIPYRIDINE COMPLEX IN APROTIC ORGANIC SOLVENTS
Authors: Sonoda Hiroshi , Sonoda Takaaki , Kobayashi Hiroshi
Published: July 2006

Bipyridine complexes of transition metal fluorides which are soluble in aprotic organic solvents are used for the fluorination of organic halides under mild conditions.
A NEW SYNTHESIS OF α-CYANOAMINES. LEWIS ACID PROMOTED NUCLEOPHILIC SUBSTITUTION OF α-SILOXYAMINES USING TRIMETHYLSILYL CYANIDE
Authors: Tokitoh Norihiro , Okazaki Renji
Published: July 2006

α-Siloxyamines obtained from tertiary amines via their N-oxides were treated with titanium tetrachloride and trimethylsilyl cyanide to give α-cyanated tertiary amines in good yields.
REDUCTION OF NITROALKENES WITH STANNOUS CHLORIDE IN NON-ACIDIC AND NON-AQUEOUS MEDIUM. SYNTHESIS OF α-SUBSTITUTED OXIMES
Authors: Varma Rajender S , Kabalka George W
Published: July 2006

α,β-Unsaturated nitroalkenes are readily reduced by SnCl2·2H2O in alcoholic media to the α-alkoxy oxime derivatives in high yields. In the presence of ethanethiol, the corresponding α-alkylthio oximes are formed.
ABSOLUTE CONFIGURATION OF CRINITOL. AN ACYCLIC DITERPENE INSECT GROWTH INHIBITOR FROM THE BROWN ALGAE SARGASSUM TORTILE
Authors: Kubo Isao , Matsumoto Takeshi , Ichikawa Nobutaka
Published: July 2006

The absolute configuration of the insect growth inhibitor crinitol, isolated from the marine algae Sargassum tortile, has been established by application of the recently developed acyclic allylic benzoate method.
A GENERAL METHOD FOR THE STEREOSELECTIVE CONSTRUCTION OF DES-AB-CHOLESTANES. A FIRST TOTAL SYNTHESIS OF (+)-8α-PHENYLSULFONYL-DES-AB-CHOLESTANE
Authors: Nemoto Hideo , Kurobe Hiroshi , Fukumoto Keiichiro , Kametani Tetsuji
Published: July 2006

(+)-8α-Phenylsulfonyl-des-AB-cholestane, a potential intermediate of vitamin D3, was stereoselectively synthesized from (−)-indanone derivative possessing the required chiralities, at the C13,C14,C17, and C20 Positions of steroidal skeleton.