bluuebunny/crossref_metadata_2025 huggingface dataset:
AN EFFICIENT PHOSPHORYLATION METHOD BY THE ACTIVATION OF ALCOHOL
Authors: Watanabe Yutaka , Mukaiyama Teruaki
Published: July 2006

The reaction of 2-alkyloxybenzoxazoles with diphenyl hydrogen phosphate proceeds smoothly to give the corresponding alkyl diphenyl phosphates in good yields. 2-Alkyloxybenzoxazoles can be readily prepared by treating the parent alcohols with 2-fluorobenzoxazole derived from 2-chlorobenzoxazole by the action of potassium fluoride.
BOROHYDRIDE REDUCTION OF METHYLENEANTHRONES: DETERMINATION OF SEQUENCE OF HYDRIDE ADDITION
Authors: Mitsuhashi Tsutomu , Oki Michinori
Published: July 2006

Derivatives of methyleneanthrone were reduced with sodium borohydride. While less crowded compounds were reduced both at the C=C and the C=O bonds, benzhydrylideneanthrone and tropylideneanthrone were initially reduced only at the C=O bond. The sequence of the two reductions is discussed on the ground of experimental results including deuterium labelling.
ASYMMETRIC ADSORPTION OF ALANINE AND ALANINE HYDROCHLORIDE BY QUARTZ FROM ETHANOL SOLUTION AT −80°C
Authors: Furuyama Shozo , Kimura Hiroko , Sawada Michio , Morimoto Tetsuo
Published: July 2006

It was found that the l-isomers of alanine and alanine hydrochloride were adsorbed preferentially by l,-quartz, while the d-isomers were adsorbed by d-quartz from ethanol solution at −80°C. The asymmetricity of adsorption fell in the range 1.3–2.2.
A NEW RING OPENING REACTION OF 2-FURALDEHYDE DIPHENYL DITHIOACETAL VIA REDUCTIVE SILYLATION. PREPARATION OF 2,3,4-TRIS(TRIMETHYLSILYL)-3-ALKENYL AND 3,4,4-TRIS(TRIMETHYLSILYL)-2-BUTENYL KETONES
Authors: Atsumi Kunio , Kuwajima Isao
Published: July 2006

5-Substituted 2-furaldehyde diphenyl dithioacetals are found to undergo facile ring-opening reaction and to give the corresponding polysilylated ketones when they were treated with metallic sodium in the presence of chlorotrimethylsilane.
INTRAMOLECULAR CYCLOADDITION PRODUCTS OF TETRAETHYL [3.3](1,4)NAPHTHALENO (9,10)ANTHRACENOPHANE- 2,2,15,15-TETRACARBOXYLATE AND TETRAETHYL [3.3]PARACYCLO(9,10)ANTHRACENOPHANE-2,2,11,11-TETRACARBOXYLATE
Authors: Shinmyozu Teruo , Inazu Takahiko , Yoshino Tamotsu
Published: July 2006

[3.3](1,4)Naphthaleno(9,10)anthracenophane derivative(3) was converted into the photoisomer(4) on exposure to light. The similar photochemical isomerization(7→8) was observed in the case of [3.3]paracyclo(9,10)anthracenophane derivative(7). Besides this, the isomer(6) due to the intramolecular Diels–Alder reaction was also formed by heating 7 at ca. 100°.
LIQUID TELLURIUM AS A CATALYST FOR THE DEHYDROGENATION OF SEVERAL POLYNUCLEAR HYDROCARBONS
Authors: Takahashi Katsumi , Ogino Yoshisada
Published: July 2006

Liquid tellurium has been found to catalyze selectively the dehydrogenation of certain polynuclear hydrocarbons, i.e. tetralin, indane, acenaphthene, 9,10-dihydroanthracene, 9,10-dihydrophenanthrene, 1,2,3,4,5,6,7,8-octahydrophenanthrene.
ACID-CATALYZED OLIGOMERIZATION BETWEEN 4-(1-ETHYL-1-PROPENYL)MORPHOLINE AND BENZYLIDENEANILINES. SYNTHESIS OF 1,2,3,4,7a,8-HEXAHYDRO-4-AZA-s-INDACENE DERIVATIVES
Authors: Nomura Yujiro , Kimura Muneaki , Takeuchi Yoshito , Tomoda Shuji
Published: July 2006

Reaction of 4-(1-ethyl-1-propenyl)morpholine with benzylideneanilines in acetic acid provided 1,2,4,6,7-pentaaryl-3,5,7a-trimethyl-1,2,3,4,7a,8-hexahydro-4-aza-s-indacene in decent yield. The reaction mechanism involving the conrotatory cyclization of an intermediate pentadienyl cation has been proposed.
A NEW METHOD FOR THE PREPARATION OF KETONES BY DECARBONYLATION OF α-HYDROXYCARBOXYLIC ACID WITH 2-CHLOROBENZOXAZOLIUM SALT
Authors: Mukaiyama Teruaki , Echigo Yoshiaki
Published: July 2006

Treatment of α-hydroxycarboxylic acids with 2-chloro-3-ethylbenzoxazolium tetrafluoroborate and triethylamine at room temperature affords ketones in good yields.
THE NATURE OF THE “CHANNEL 3” DECAY MECHANISM IN BENZENE
Authors: Kanamaru Nobuaki
Published: July 2006

A simple but realistic mechanism for the “channel 3” decay in benzene is proposed where energy levels of isomers are incooporated as intermediate states of S1 → S0 internal conversion.
1-ARYLSULFINYL-1-ALKEN-1-YLLITHIUM
Authors: Okamura Hisashi , Mitsuhira Yoshiyuki , Miura Morikazu , Takei Hisashi
Published: July 2006

The generation of the title compound (2) by the treatment of alkenyl aryl sulfoxide (1) with lithium diisopropylamide (LDA), and the reactions of 2 with methyl iodide, carbonyl compounds, and oxiranes were described.
AN ELECTRON SPIN RESONANCE SPECTROSCOPIC INVESTIGATION OF N-SULFINYLAMINYLS
Authors: Miura Yozo , Nakamura Yuji , Kinoshita Masayoshi
Published: July 2006

N-Sulfinylaminyls (2) were generated from sulfinamides (1) by hydrogen-abstraction using t-butoxyls, and were investigated by ESR spectroscopy. The ESR parameters for 2 suggest that in 2 the most of the unpaired electron resides on the nitrogen and the N-phenyl ring, negligibly delocalizes onto the sulfinyl group.
A NEW APPROACH TO THE SYNTHESIS OF THIOPHENOPHANES. SYNTHESIS OF [n.1.1]PARACYCLO(2,5)THIOPHENOPARACYCLOPHANES
Authors: Miyahara Yuji , Inazu Takahiko , Yoshino Tamotu
Published: July 2006

A new method for the synthesis of thiophenophanes which consists of cyclization of bischloroacetyl compounds with sodium sulfide and condensation of the resulting keto sulfides with glyoxal was developed. As an application a series of [n.1.1]paracyclo(2,5)thiophenoparacyclophanes (n=3,4,5,6,7,8,10) were synthesized.
SYNTHESIS OF Nβ-METHYL-l-β-ARGININE, A COMPONENT AMINO ACID IN A NEW ANTIBIOTIC LL-BM547β
Authors: Nomoto Shinya , Shiba Tetsuo
Published: July 2006

First synthetic method for preparation of N-methyl guanidino β-amino acid was established. Thus, Nβ -methyl-l-β-arginine, a component of the antibiotic LL-BM547β, was synthesized from Nγ-t-butoxycarbonyl-Nα-tosyl-l-α,γ-diaminobutyric acid through a successive reaction of Nα-methylation of tosylamino group with diazomethane, the Arndt–Eistert synthesis, and guanidination of the ω-amino group. The synthetic product was identical with the natural amino acid with respect to a specific rotation and NMR spectrum.
A MECHANISM OF THE PHOTOCHEMICAL ISOMERIZATION OF QUINOLINE N-OXIDES
Authors: Hata Norisuke , Oguro Toshiyuki
Published: July 2006

The photochemical behavior of 2-cyanoquinoline N-oxide and 4-methylquinoline N-oxide in aqueous ethanol containing potassium iodide or ethyl iodide was examined. The results indicate that Process I (N-oxide → lactam) proceeds via a protonation of the N→O group through a hydrogen-bonding interaction in the S1 state, whereas Process II (N-oxide → oxazepine) occurs with the formation of oxaziridine intermediate from the S1 state.
ENANTIOFACE-DIFFERENTIATING (ASYMMETRIC) ADDITION OF DIALKYLMAGNESIUM TO ALDEHYDES BY USING THE LITHIUM SALT OF (2S, 2′S)-2-HYDROXYMETHYL-1-[(1-METHYLPYRPOLIDIN-2-YL)METHYL]PYRROLIDINE AS A CHIRAL LIGAND
Authors: Sato Toshio , Soai Kenso , Suzuki Keisuke , Mukaiyama Teruaki
Published: July 2006

Optically active alcohols possessing the R-configuration are produced in good optical yields by treating aromatic and aliphatic aldehydes with dialkylmagnesium by using the lithium salt of (2S, 2′S)-2-hydroxymethyl-1-[(1-methylpyrrolidin-2-yl)methyl]pyrrolidine as a chiral ligand.
SYNTHESIS OF SILYL ENOL ETHER. REACTION OF SILYLENE WITH CARBONYL COMPOUNDS
Authors: Ando Wataru , Ikeno Masayuki
Published: July 2006

Under neutral and mild conditions, silyl enol ethers are synthesized in good yields by the reactions of ketones or aldehydes with dimethylsilylene, which generated by the photolysis of dodecamethylcyclohexasilane.
SYTHESIS OF OPTICALLY ACTIVE COMMON PRECURSOR OF SEX PHEROMONE OF PINE SAWFLIES: AN APPLICATION OF ENANTIOFACE-DIFFERENTIATING HYDROGENATION WITH MODIFIED NICKEL
Authors: Tai Akira , Imaida Motomasa , Oda Toshihiko , Watanabe Hiroshi
Published: July 2006

Synthesis of optically active 3,7-dimethylpentadecan-2-ol (1), a common precursor of sex pheromone of pine sawflies, was carried out. (+)-(2S,3S)-, (−)-(2R,3R)-, and (±)-(2R*, 3S*)-1 were prepared from (+)-(2R, 3S)-, (−)-(2S, 3R)-, and (±)-(2R*, 3S*)-3-hydroxy-2-methylbutyric acid, respectively under the conservation of their stereochemistry. Enantioface-differentiating (asymmetric) hydrogenation of methyl 2-methyl-3-oxobutyrate over tartaric acid-modified nickel catalyst gave methyl 3-hydroxy-2-methylbutyrate in high diastereomer and enantiomer excess, enabling us to obtain the optically active starting materials in high yields.
INSERTION OF CARBON DIOXIDE INTO THE Ni–R BOND OF NiR2(bpy) (R = CH3, C2H5) AND ELIMINATION OF DIETHYL KETONE FROM THE INTERMEDIATE PRODUCT Ni (C2H5) (OCOC2H5) (bpy)
Authors: Yamamoto Takakazu , Yamamoto Akio
Published: July 2006

Ni(C2H5)2(bpy) (bpy = 2,2′-bipyridine) reacts with CO2 in benzene at 40–50 °C to afford diethyl ketone and nickel propionate. Diethyl ketone seems to be formed through an intramolecular rearrangement in an intermediate product Ni(C2H5) (OCOC2H5) (bpy). A similar reaction of Ni(CH3)2(bpy) gives nickel acetate.
SENDANAL, A NEW LIMONOID FROM MELIA AZEDARACH LINN. VAR. JAPONICA MAKINO
Authors: Ochi Masamitsu , Kotsuki Hiyoshizo , Tokoroyama Takashi
Published: July 2006

A new limonoid of biogenetic interest, sendanal, has been isolated from the fruit of M. azedarach Linn. var. japonica Makino and its structure also been deduced from its spectral data coupled with chemical evidence.
A NEW METHOD FOR GLYCOSYLATION WITH CARBODIIMIDES; NUCLEOPHILIC SUBSTITUTION OF GLYCOSYLISOUREAS
Authors: Tsutsumi Hideo , Awai Yoshio , Ishido Yoshiharu
Published: July 2006

A glycosyl isourea, prepared from a sugar derivative with free 1-hydroxyl group and a carbodiimide in the presence of cuprous chloride, was successfully subjected to the reaction with a series of protic nucleophiles to give the corresponding glycosyl compounds, i.e., 1-O-acylglycoses, phenyl glycosides, alkyl glycosides including disaccharides, and purine nucleosides, in good yields.
ISOTOPE EFFECT IN THE REDUCTION OF TRIFLUOROACETOPHENONE
Authors: Ohno Atsuyoshi , Yamamoto Hiroyuki , Okamoto Tadashi , Oka Shinzaburo , Ohnishi Yutaka
Published: July 2006

Kinetic (kH/kD) and product (YH/YD) isotope effects have been studied for the reduction of α,α,α-trifluoroacetophenone with 1-propyl-1,4-dihydronicotinamide in acetonitrile in the presence or absence of magnesium perchlorate. It is concluded that the magnesium ion catalyzes the initial electron-transfer process of the reduction.
SYNTHESIS AND REACTIONS OF NEW HIGHLY STRAINED UNSATURATED PROPELLANES, [4.2.1]PROPELLA-2,4,7-TRIENES
Authors: Toda Fumio , Yoshioka Takayuki , Kawada Masao
Published: July 2006

The title propellane, 2,7-di-tert-butyl-11,11-dichloro-4,5,9,10-tetraaryl-tetracyclo[6.2.1.0.03,6]undeca-2,4,6,9-tetraene (3), was prepared by cycloaddition of dichlorocarbene to the benzene nucleus of 2,7-di-tert-butyl-4,5,9,10-tetraaryl-tricyclo[6.2.0.03,6]deca-1,3(6),4,7,9-pentaene (1). On Ag+-induced methanolysis and acetolysis of 3a, its endo-Cl reacted easily and endo-methoxy (6) and endo-acetoxy derivative (9) were obtained, respectively, probably via bishomoallyl cation of pyramidal structure (5). Hydrolysis of 3a and 9 afforded 1a.
A STEREOSELECTIVE SYNTHESIS OF 1,2-DIALKYLETHENYL BROMIDES VIA MONOHYDROBORATION OF 1-BROMO-1-ALKYNES WITH DIALKYLBORANES
Authors: Masuda Yuzuru , Arase Akira , Suzuki Akira
Published: July 2006

Treatment of 1-bromo-1-alkenyldialkylboranes with lead(IV) acetate or iodosobenzene diacetate afforded 1-bromo-1,2-dialkylethylenes in moderate yields. Furthermore, both E-isomers and Z-isomers could be independently obtained as the main products by the use of different reaction conditions.
ELECTROCHEMICAL REACTION OF TRIALKYLBORANES WITH ACETONE
Authors: Takahashi Yuzuru , Tokuda Masao , Itoh Mitsuomi , Suzuki Akira
Published: July 2006

Trialkylboranes are readily electrolyzed in acetone solution, containing tetraalkylammonium salts to give corresponding 2-alkyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolanes (1) and 2-alkyl-4,4,6-trimethyl-1,3,2-dioxaborinanes (2) in good yields.
RAMAN SCATTERING STUDY ON TAUTOMERISM OF l-HISTIDINE
Authors: Ashikawa Ikuo , Itoh Koichi
Published: July 2006

The Raman spectra of l-histidine in basic aqueous solutions show the scattering peaks clearly assignable to the 1-N and 3-N protonated forms of the imidazole ring. From the measurement of the spectra as a function of temperature, it was concluded that the 1-N protonated form is energetically more stable than the 3-N protonated form and ΔH is 1.0±0.3kcal/mol.
3-AMINOCARBONYL-N-BENZYL-1,4-DIHYDROQUINOLINE: A NOVEL NADH MODEL COMPOUND WHICH RESISTS THE ACID CATALYZED DECOMPOSITION
Authors: Shinkai Seiji , Hamada Hisatake , Ide Toyoko , Manabe Osamu
Published: July 2006

The title NADH model compound resists acids unlike the conventional NADH model compounds. Thus, added acids accelerate the reduction of a carbonyl substrate selectively in the general-acid catalyzed manner.
A FACILE TRANSFORMATION OF ESTER GROUPS TO VINYL GROUPS BY THE ELECTROREDUCTIVE METHOD
Authors: Shono Tatsuya , Matsumura Yoshihiro , Kashimura Shigenori
Published: July 2006

A facile method of the transformation of esters to vinyl compounds was developed by using the electroreductive 1,2-elimination as a key step. β-Hydroxysulfones were electrochemically reduced to vinyl compounds in good yields. Hydroxyolefins could be also prepared from the corresponding lactones.
STRUCTURES OF PLATYCODIN-D3, PLATYCONIC ACID-A, AND THEIR DERIVATIVES, SAPONINS ISOLATED FROM ROOT OF PLATYCODON GRANDIFLORUM A. DE CANDOLLE, DETERMINED BY CARBON-13 NMR SPECTROSCOPY
Authors: Ishii Hiroshi , Tori Kazuo , Tozyo Takehiko , Yoshimura Yohko
Published: July 2006

Six new saponins (5–10) and three new prosapogenins (13, 14, and 16) have been isolated from the root of Platycodon grandiflorum A. DC. Their structures have been elucidated by 13C NMR spectroscopy.
A ROLE OF 2,7-DIISOPROPYL GROUPS IN THE STABILITY OF THIEPIN
Authors: Yano Shigeo , Nishino Keitaro , Nakasuji Kazuhiro , Murata Ichiro
Published: July 2006

2,6-Diisopropyl-4-methylthiopyrylium tetrafluoroborate (18) was converted into the diazoester (19) by reaction with ethyl lithiodiazoacetate. Treatment of 19 with Pd(II) complex resulted in exclusive formation of ethyl 4,5-diisopropyl-2-methylbenzoate (21) through sulfur extrusion of the intermediate thiepin (20) even at −70°C.
BINDING AND PHOTOIONIZATION OF N-SUBSTITUTED 2-CHLOROPHENOTHIAZINES IN SDS MICELLES
Authors: Iwaoka Teiki , Kondo Michio
Published: July 2006

The analogs of chlorpromazine with different length of methylene unit, were synthesized and examined on their binding sites and on the photochemical reactions in the aqueous micelle of sodium dodecyl sulfate (SDS). In spite of the difference of the binding position in the micelle, all the compounds employed show the same photochemical behaviors of the transient species and give the same types of photoproducts.
CATALYTIC ACTIVITY OF TiO2 TREATED WITH HEXAFLUOROACETONE IN THE ISOMERIZATION OF 1-BUTENE
Authors: Okazaki Susumu , Kurosaki Akito
Published: July 2006

The catalytic activity of TiO2 is markedly enhanced by treatment with hexafluoroacetone. The IR spectrum of pyridine adsorbed on treated TiO2 and the selectivity of 2-butene indicate that the active sites are Brönsted acid formed by the interaction between hexafluoroacetone and the TiO2 surface.
A PRODUCT ON THE SURFACE OF COPPER-EVAPORATED POLYMERIC FILM PREPARED BY SUCCESSIVE TREATMENTS OF ELECTRON BOMBARDMENT AND HEATING
Authors: Ohno Shin
Published: July 2006

On a copper-evaporated polymeric film consisting of a poly(vinylchloride) type matrix and a photo- or thermo-chromic benzospiran compound, a hydrophobic covering product was selectively prepared under successive treatments of electron bombardment in vacuo and heating in nitrogen. In the part bombarded at a high intensity, the chemical properties of the surface copper were preserved during the heating. In the non-bombarded part, on the other hand the copper was covered by diffused components from the organic layer during the heating and the film surface was turned insoluble in acid.
PHOTO-INDUCED ADDITION OF IMIDES TO OLEFINS—REMARKABLE DIFFERENCE BETWEEN PHTHALIMIDES AND SUCCINIMIDES
Authors: Maruyama Kazuhiro , Kubo Yasuo
Published: July 2006

On irradiation, phthalimides 4 dissolved in acetonitrile reacted with various olefins 1 to give 5, while the reaction of succinimides with the corresponding olefins resulted in the formation of oxetanes. Photolysis of N-alkenylphthalimides 8 in acetonitrile afforded 9. The presence of N-alkenyl δ,ε double bond (counted from N atom) is extremely preferable for the formation of 9.
A CONVENIENT METHOD FOR THE PREPARATION OF ALLENES FROM PROPARGYL ALCOHOLS USING 1-ETHYL-2-FLUORO-4,6-DIMETHYLPYRIDINIUM TETRAFLUOROBORATE
Authors: Mukaiyama Teruaki , Kawata Ken
Published: July 2006

In the presence of a catalytic amount of copper(I) iodide, Grignard reagents reacted with 2-propargyloxypyridinium salts, formed in situ from propargyl alcohols and 1-ethyl-2-fluoro-4,6-dimethylpyridinium tetrafluoroborate, to produce various substituted allenes in good yields.
A CONVENIENT ROUTE FROM 1-ALKENES TO TERMINAL ACETYLENES VIA HYDROALUMINATION REACTIONS
Authors: Sato Fumie , Kodama Hiroyuki , Sato Masao
Published: July 2006

Hydroalumination of 1-alkenes with lithium aluminum hydride by catalysis of titanium tetrachloride followed by treatment with bromopropadiene was found to be a convenient route to add the acetylene moiety to the terminal double bond.
REACTION OF α-CHLORO KETONES WITH ALLYLTRI-n-BUTYLTIN. CONTROL OF REACTION SITE BY THE VARIATION OF REACTION CONDITIONS
Authors: Kosugi Masanori , Arai Haruyoshi , Yoshino Akihiro , Migita Toshihiko
Published: July 2006

Reaction of α-chloro ketones with allyltri-n-butyltin proceeds to afford 4-butenyl ketones in the presence of azobisisobutyronitrile, while in the presence of catalytic amounts of tetrakis(triphenylphosphine)palladium allyl epoxides are obtained.
APPLICATION OF HYDROALUMINATION REACTIONS IN ORGANIC SYNTHESES. A CONVENIENT ROUTE TO TERMINAL ALLENES FROM 1-OLEFINS
Authors: Sato Fumie , Oguro Kaoru , Sato Masao
Published: July 2006

Hydroalumination of 1-olefins with lithium aluminum hydride followed by treatment with 3-bromo-1-propyne in the presence of a catalytic amount of copper(I) chloride resulted in coupling. This new development provides a general method for the synthesis of terminal allenes.
REACTION OF ALKYL ARYL SULFOXIDE WITH METHYL PHENYL N-CHLOROSULFOXIMIDE. DIRECT SYNTHESIS OF OPTICALLY ACTIVE α-CHLORO SULFOXIDE WITH OPTICALLY ACTIVE N-CHLOROSULFOXIMIDE
Authors: Morita Hiroyuki , Itoh Hideaki , Furukawa Naomichi , Oae Shigeru
Published: July 2006

Treatment of a few alkyl aryl sulfoxides with methyl phenyl N-chlorosulfoximide resulted in the quantitative formation of α-chloro sulfoxides. When the optically active methyl phenyl N-chlorosulfoximide was used, the α-chloro sulfoxides having optical activity on the sulfinyl sulfur were obtained from the corresponding sulfoxides.
REACTIONS OF AN ISOCYANIDE–PALLADIUM(II) COMPLEX WITH NITRILYLIDES
Authors: Hiraki Katsuma , Fuchita Yoshio
Published: July 2006

cis-[PdCl2(PPh2Et)(CN–C6H4–CH3–p)] reacted with nitrilylides, derived from N-[(p-nitrophenyl)methyl]arylcarboximidoyl chlorides and triethylamine, to afford novel cyclic carbene–palladium(II) complexes, cis-[PdCl2(PPh2Et){CN(C6H4–CH3-p)C(C6H4–R-p)=N–CH(C6H4–NO2-p)}].
LONG-RANGE 13CSP2–19F SPIN–SPIN COUPLINGS IN MONOFLUORO[2.2]CYCLOPHANES
Authors: Takemura Tetsuo , Mori Nobuo
Published: July 2006

The title couplings are observed in 8-fluoro[2.2]metacyclophane, 1, and 8-fluofo[2.2]metaparacyclophane, 2, but not in 4-fluoro[2.2]paracyclophane, 3.
TRIFLIC ACID CATALYZED DOUBLE-CYCLIZATION OF N,N-DIBENZYL-2-PROPYNYLAMINE AND REIATED COMPOUNDS
Authors: Takayama Hiroaki , Suzuki Takayoshi , Nomoto Takashi
Published: July 2006

Triflic acid catalyzed double-cyclization reactions of N,N-dibenzyl-2-propynylamine, N-benzyl-N-phenethyl-2-propynylamine, and N-(α-benzylphenethyl)-2-propynylamine afforded 1-aza-5-methyldibenzo [c,f]bicyclo [3.3.1] nona-3,6-diene,1-aza-6-irethyldibenzo[d,q]bicyclo[4.3.1]deca-4,7-diene and 6-aza-1-methyldibenzo[b,i]bicyclo[3.3.2]nona-2,8-diene in high isolated yields, respectively.
SYNTHESIS AND CONFORMATION OF cyclo(-d- OR l-TYR(ME)-l-ILE-l-PRO-l-LEU-), DIASTEREOMERIC AND SIMPLIFIED ANALOGS OF CYL-2
Authors: Yasutake Akira , Lee Sannamu , Aoyagi Haruhiko , Kato Tetsuo , Izumiya Nobuo
Published: July 2006

Diastereomeric cyclotetrapeptides, cylol (-d- or l-Tyr(Me)-l-Ile-l-Pro-l-Leu-) (1d or 1l) which are simplified analogs of a phytotoxin Cyl-2, have been synthesized. A conformation with trans-trans-cis-trans peptide bonds,l-Ile-l-Pro bond being cis, is proposed for 1d on the basis of 1H-and 13C-NMR data.
BIS(FLUOROALKOXY)TRIPHENYLPHOSPHORANES: PREPARATION AND REACTIONS
Authors: Kubota Toshio , Kitazume Tomoya , Ishikawa Nobuo
Published: July 2006

Bis(fluoroalkoxy)triphenylphosphoranes were prepared by the replacement of bromines of triphenylphosphine dibromide by fluoroalkoxides [C6H5C(CF3)2ONa, and CF3CH2ONa]. Alcohols and carboxylic acids readily reacted with Ph3P(OCH2CF3)2 to form corresponding 2,2,2-trifluoroethyl ethers and esters, respectively. Ph3P(OC(CF3)2C6H5]2, however, was so stable that it did not undergo reactions with these hydroxyl compounds.
THE FORMATION OF SCHIFF BASE FROM DIMETHYL α, β-DIBROMOSUCCINATE AND AN ASYMMETRIC SYNTHESIS OF ASPARTIC ACID
Authors: Harada Kaoru , Nakamura Isao
Published: July 2006

The reaction of α-methylbenzylamine with dimethyl meso and racemic dibromosuccinate resulted in the formation of trans-aziridine(Ib) and Schiff base(III) of dimethyl oxaloacetate. The optically active III was hydrogenated and hydrogenolyzed to form optically active aspartic acid(V). The optical purity of V reached up to 49 %.
REACTION OF BENZOYL PEROXIDE WITH ALLYLTRIMETHYLTIN
Authors: Kosugi Masanori , Hanh Phan Quoc , Nakayama Mitsumasa , Migita Toshihiko
Published: July 2006

Decomposition of benzoyl peroxide in allyltrimethyltin affords allyl benzoate and trimethyltin benzoate. Kinetic investigation shows that the reaction mainly proceeds through the cyclic transition state. This is the first example of molecular reaction between peroxide and allyltin compound.
SYNTHESES OF S-PHENYL 3-OXOBUTANETHIOATES AND 2H-1-BENZOTHIOPYRAN-2-ONE DERIVATIVES (THIOCOUMARINS)
Authors: Nakazumi Hiroyuki , Kitao Teijiro
Published: July 2006

S-Phenyl 3-oxobutanethioates,precursor for preparation of thiocoumarins, were prepared from benzenethiols and diketene in the presence of triethylamine. Cyclization of these compounds with PPA gave thiocoumarin and/or isomeric thiochromone derivatives.
CHARGE TRANSFER COMPLEXES OF THIAHETEROHELICENES WITH 7,7,8,8-TETRACYANOQUINODIMETHANE. A NEWLY FASHIONED STERIC EFFECT
Authors: Yamada Koh-ichi , Yamada Takako , Kawazura Hiroshi
Published: July 2006

The title effect in the charge transfer complexes of thiaheterohelicenes and tetracyanoquinodimethane was characterized by their spectroscopic and electrical properties.
RAMAN SPECTROSCOPIC STUDIES ON CONFORMATIONAL POLYMORPHISM OF 1-BROMOPENTANE
Authors: Ogawa Yoshiki , Tasumi Mitsuo
Published: July 2006

Two crystal modifications of l-bromopentane gave entirely different Raman spectra, which undoubtedly indicated simultaneous occurrence of a crystal transformation and a conformational change of molecules in the crystal. The molecular conformation is trans-trans-trans (TTT) in one crystal modification (Crystal I) and trans-trans-gauche (TTG) in the other (Crystal II). The polymorphism of l-iodopentane, which presents a contrast to the case of 1-bromopentane, is also described.
THREE ACETYLATED DITERPENE DIOLS OF VERRUCOSANE TYPE FROM THE LIVERWORT, Mylia verrucosa
Authors: Hayashi Shûichi , Matsuo Akihiko , Nozaki Hiroshi , Nakayama Mitsuru , Takaoka Daisuke , Hiroi Mitsuru
Published: July 2006

Three new monoacetates of diterpene diols were isolated from Mylia verrucosa and the structures were determined as [2], [3] and [9] on the basis of chemical and spectral evidence.
THE SYNTHESIS AND REACTION OF 3,4-DIMETHYLENE-1,5-CYCLOHEPTADIENE
Authors: Oda Mitsunori , Kato Kazuo , Kitahara Yoshio , Kuroda Shigeyasu , Morita Noboru , Asao Toyonobu
Published: July 2006

Title compound (5) has been synthesized by conversion of dimethyl 1,3,5-cycloheptatriene-3,4-dicarboxylate to 3,4-bis(bromomethyl)-1,3,5-cycloheptatriene followed by zinc-copper reduction. 5 changed to spiro dimer (13) on standing at room temperature and reacted with dienophiles to give Diels–Alder adducts fused with cycloheptatriene.
A MILD AND EFFICIENT METHOD FOR THE ESTERIFICATION OF CEPHALOSPORANIC ACIDS
Authors: Matsueda Rei
Published: July 2006

A mild and efficient method for the preparation of esters of cephalosporanic acids via the 3-nitro-2-pyridinethiol ester, easily prepared by the reaction of cephalosporanic acid salt with 3-nitro-2-pyridinesulfenyl halide and triphenylphosphine, is reported. Pure Δ3-esters of various cephalosporanic acids were prepared in good yields by this method without accompanying isomerization of the thiazine ring.
STUDIES ON PHOTOACTIVATED ELCTRON-TRANSPORT SYSTEMS. II. ELECTRON-TRANSFER QUENCHING OF PHOTOEXCITED RUTHENIUM(II) COMPLEXES BY VARIOUS BIPYRIDINIUM IONS
Authors: Takuma Keisuke , Shuto Yoshito , Matsuo Taku
Published: July 2006

Rate constants for quenching emission from photoexcited tris-(2,2′-bipyridine)- and tris(1,10-phenanthroline)Ru(II) complexes by bipyridinium ion vary with the redox potential of the quencher. Annihilation of the geminate ion pairs at the quenching step can be reduced by the addition of EDTA. The effect of EDTA increases with the concentration but quickly reaches asymptotic values as expected in the presence of an extremely fast geminate recombination of ion pairs in a cage.
SYNTHESIS OF CARPACHROMENE
Authors: Jain A C , Khazanchi R , Kumar A
Published: July 2006

Acacetin (4) on reaction with prenyl bromide in the presence of metbanolic sodium methoxide yielded 6,8-di-C, C-prenyl-(5) and 6-C-prenyl-(9) derivatives. DDQ reaction with 9 followed by methylation afforded di-O-methyl carpachromene (2). Nuclear prenylation of apigenin (3) gave 6,8-di-C,C-prenyl-(15) and its 7-prenyl ether (14) and 6-C-prenyl-(16) derivatives. DDQ reaction of 16 provided natural carpaoEromene.2 The structure of the isopentenylated apigenin isolated by Dreyer et al.3 requires re-examination.
SYNTHESIS OF RACEMIC 8-C-PRENYL-6″,6″-DIMETHYLPYRANO(2″, 3″:7,6)NARINGENIN
Authors: Jain A C , Gupta R C , Sarpal P D
Published: July 2006

Reaction of naringenin (1) with 2-methylbut-3-en-2-ol in the presence of BF3–Et2O gives a mixture of 6-C-prenyl-(5), 8-C-prenyl-(8) and 6,8-di-C,C-prenyl-(2) derivatives. The last compound (2) with DDQ afforded 8-C-prenyl-6″,6″-dimethylpyrano(2″,3″:7,6)naringenin (11) along with its angular isomer (10) in racemic forms.
HIGH CATALYTIC ACTIVITY OF NICKEL SUPPORTED ON BASIC OXIDE FOR HYDROGENATION OF N,N-DIMETHYL-2-PROPENYLAMINE
Authors: Imai Hisaya , Hattori Hideshi , Tanabe Kozo
Published: July 2006

Various metal oxides were used as supports of Ni catalyst for hydrogenation of N,N-dimethyl-2-propenylamine. In general, the activities of basic oxide-supported Ni catalysts were higher than those of acidic oxide-supported ones. Among the catalysts examined, Ni/MgO exhibited the highest activity.
THE RHODIUM CATALYZED N-HETEROCYCLIZATION. THE SYNTHESIS OF QUINOLINES FROM AMINOARENES AND ALDEHYDES
Authors: Watanabe Yoshihisa , Yamamoto Michihiro , Shim Sang Chul , Mitsudo Take-aki , Takegami Yoshinobu
Published: July 2006

Aminoarenes react with aldehydes in the presence of a catalytic amount of a rhodium complex at 180°C to give substituted quinolines in good to excellent yields. Thus, quinaldine derivatives are readily prepared from aminobenzenes and ethanal.
SILVER ION INDUCED CYCLIZATION REACTIONS OF 1,1-DIMETHYL-2 -TRIMETHYLSILOXYALLYL CHLORIDE WITH 1,3-DIENES
Authors: Shimizu Nobujiro , Tsuno Yuho
Published: July 2006

1,1-Dimethyl-2-trimethylsiloxyallyl chloride in the presence of 1,3-dienes gives seven-membered cyclic enones on treatment with silver perchlorate in yields of 85% with furan, 91% with cyclopentadiene, and 64% with isoprene, whereas the reaction with 2-methylfuran yields a mixture of two (5-methyl-2-furyl)butanone derivatives and two bicyclic enones.
ONE OF THE SIMPLEST METHODS FOR THE REPLACEMENT OF DIAZONIUM GROUPS BY HYDROGEN OR DEUTERIUM
Authors: Shono Tatsuya , Matsumura Yoshihiro , Tsubata Kenji
Published: July 2006

A simple and versatile method for the replacement of aromatic diazonium groups by hydrogen or deuterium was exploited by utilizing thiophenol as a reducing agent. The yields were over 84% for 14 examples and the isotopic purity was 100%. The reaction may involve a free radical mechanism.
INFLUENCE OF THE FLUIDITY OF DIALKYLAMMONIUM BILAYER MEMBRANES ON THE CATALYTIC HYDROLYSIS OF p-NITROPHENYL PALMITATE
Authors: Kunitake Toyoki , Sakamoto Tetsuo
Published: July 2006

In the hydrolysis of p-nitrophenyl palmitate catalyzed by a long-chain imidazole in the presence of the aqueous bilayer membrane of double-chain ammonium surfactants, the Arrhenius plots showed inflection points which were apparently related to the phase transition of the bilayers.
REACTIONS OF t-ALKYL THIONITRATES WITH p-AMINOPHENOLS: ONE POT SYNTHESES OF N-(t-ALKYLTHIO)-p-BENZOQUINONEIMINES
Authors: Oae Shigeru , Shinhama Koichi , Kim Yong Hae
Published: July 2006

Various N-(alkylthio)-p-benzoquinoneimines were readily synthesized by treating corresponding p-aminophenols with t-alkyl thionitrates.
A CONVENIENT METHOD FOR THE PREPARATION OF α-CHLORONITRILES
Authors: Mukaiyama Teruaki , Kawata Ken , Sasaki Akira , Asami Masatoshi
Published: July 2006

2-Chloro-3-ethylbenzoxazolium tetrafluoroborate reacts smoothly with various cyanohydrins in the presence of tetraethylammonium chloride to afford α-chloronitriles in good yields.
SYNTHESIS OF [2]PARACYCLO[2]PARACYCLO[2](1,1′)FERROCENOPHANE DERIVATIVES
Authors: Kasahara Akira , Izumi Taeko , Shimizu Iwao
Published: July 2006

[2]Paracyclo[2]paracyclo[2](1,1′)ferrocenophane derivatives having olefinic or acetylenic bonds and aromatic rings were synthesized by intramolecularly titanium-induced reductive coupling of carbonyl compounds. The transannular π-electronic interactions between two olefinic or acetylenic bonds and two benzene rings were examined on the basis of electronic spectra.
EFFECT OF WATER ON STABILITY OF CARBON BLACK DISPERSED IN NONAQUEOUS AEROSOL OT SOLUTIONS
Authors: Kitahara Ayao , Tamura Takamitsu , Matsumura Shigeru
Published: July 2006

Water solubilized in the reversed micelle of Aerosol OT affected markedly the stability of carbon black dispersed in the solution. For the dilute dispersion of carbon black in the fixed concentration of Aerosol OT, the addition of water stabilized electrostatically the dispersion, following massive flocculation and finally recovered stability. The latter stability is due to the formation of network.
ELECTROCHEMICAL PHOTOCELL USING Li DOPED CdS FILM ANODE
Authors: Tsuiki Masayasu , Minoura Hideki
Published: July 2006

The doping of Li in a sprayed CdS film electrode results in a significant increase in the anodic photocurrent at this electrode. The quantum yield for the electron flow at short-circuit current condition of the photocell using the Li doped CdS film anode amounts to 50% at wavelengths shorter than 480nm and is several times greater than that using an undoped CdS film anode.
REDOX-PHOTOSENSITIZED STEREOMUTATION OF 1-PHENOXYPROPENE; CATALYSIS BY THE CATION RADICAL OF AROMATIC HYDROCARBONS
Authors: Majima Tetsuro , Pac Chyongjin , Sakurai Hiroshi
Published: July 2006

The stereomutaion of 1-phenoxypropene occurred by the redox-photosensitization using aromatic hydrocarbon-dicyanobenzene-acetonitrile systems, giving rise to a photostationary mixture of the cis- and trans-isomers in 1:1-ratio. The combined quantum yields for the trans→cis and cis→trans isomerizations were over unity. The mechanism is discussed in terms of catalysis by the cation radical of aromatic hydrocarbons.
RETENTION OF pro-4R HYDROGEN ATOM OF MEVALONIC ACID IN BIOSYNTHESIS OF CYCLIC MONOTERPENOIDS. EVIDENCE FOR INDIRECT FORMATION OF cis-ISOPRENE UNIT FROM ISOPENTENYL AND DIMETHYLALLYL PYROPHOSPHATES
Authors: Suga Takayuki , Shishibori Tsuyoshi
Published: July 2006

The pro-4R hydrogen atom of mevalonic acid was preserved in perillaldehyde, carvone, menthol, and limonene biosynthesized from the mevalonic acid by higher plants. This is evidence that such a condensation of isopentenyl pyrophosphate with dimethylallyl pyrophosphate as directly giving rise to a cis-isoprene unit is not involved in the biosynthesis of cyclic monoterpenoids in higher plants.
THE STRUCTURE OF THE OXIDATION PRODUCT OF ACONITINE WITH NITRIC ACID
Authors: Amiya Takashi , Kanaiwa Yoshio , Bando Hideo , Nakano Naomi , Suginome Harusada
Published: July 2006

The structure of nitronitrosoaconitinic acid which is an oxidation product of aconitine with nitric acid was confirmed by spectroscopic methods. This compound was found to be a new type of acid having a pKa value comparable to that of carboxylic acids.
X-RAY PHOTOELECTRON SPECTROSCOPIC STUDY OF HIGHLY CONDUCTIVE IODINE-DOPED POLYACETYLENE
Authors: Ikemoto Isao , Sakairi Minoru , Tsutsumi Takayoshi , Kuroda Haruo , Harada Issei , Tasumi Mitsuo , Shirakawa Hideki , Ikeda Sakuji
Published: July 2006

The X-ray photoelectron spectra of iodine-doped polyacetylene (CHIx)n films are studied. By comparing with the results of Raman spectroscopy, it is concluded that iodine is more concentrated in the surface region than in the bulk when the amount of the doped iodine is small (i.e., x<0.05). It is probable that in a heavily iodine-doped film, iodine is distributed more homogeneously throughout the film, and that a considerable amount of iodine in the surface region can be easily liberated when the film is kept in vacuum. The mole ratio of I5−/I3− is higher in the surface region than in the bulk.
SEPARATION AND CHARACTERIZATION OF SHORT-LIVED RADICALS IN Dl-METHIONINE AQUEOUS SOLUTION BY HIGH SPEED LIQUID CHROMATOGRAPH EQUIPPED WITH ESR SPECTROMETER
Authors: Makino Keisuke , Hatano Hiroyuki
Published: July 2006

Short-lived radicals produced in a Dl-methionine aqueous solution by γ-irradiation were converted into stable ones by spin-trapping, and they were separated and detected by a high speed liquid chromatograph equipped with an ESR spectrometer. The radicals separated in this way were characterized by a conventional ESR spectrometer. Consequently, the structures of four radicals were successfully identified.
ASYMMETRIC SYNTHESIS OF CYCLOPROPANES AND γ-BUTYROLACTONES BY THE REACTION OF DIMETHYLSULFOXONIUM METHYLIDE WITH (E)-(2R,3S)-6-ALKYLIDENE-3,4-DIMETHYL-2-PHENYLPERHYDRO-1,4-OXAZEPINE-5,7-DIONE
Authors: Mukaiyama Teruaki , Fujimoto Katsumi , Takeda Takeshi
Published: July 2006

Dihydrofuran and cyclopropane derivatives are produced by the reaction of (E)-(2R,3S)-6-alkylidene-3,4-dimethyl-2-phenylperhydro-l,4-oxazepine-5,7-diones with dimethylsulfoxonium methylide. The cyclopropane derivatives are hydrolyzed and esterified to give highly optically pure (>90%e.e.) dimethyl 2-alkylcyclopropane-1,1-dicarboxylates. Highly optically pure (>90%e.e.) 3-substituted γ-butyrolactones are obtained by the hydrolysis of the dihydrofuran derivatives.
REACTION OF AMIDOXIMES WITH DIPHENYLCYCLOPROPENONE. SYNTHESIS OF 2-ARYL-5,6-DIPHENYLPYRIMIDIN-4-ONES
Authors: Takahashi Masahiko , Watanabe Shin-ichi
Published: July 2006

The reaction of arylamidoximes with diphenylcyclopropenone in refluxing toluene gave 2-aryl-5,6-diphenylpyrimidin-4-ones in good yields.
REDUCTION OF β-SULFENYLATED α,β-UNSATURATED KETONES WITH NaBH4-METAL HALIDE
Authors: Nishio Takehiko , Omote Yoshimori
Published: July 2006

Reduction of β-sulfenylated α,β-unsaturated ketones (1) with sodium borohydride (NaBH4) in the presence of a catalytic amount of metal halide (CoCl2 or NiCl2) gave the saturated ketones (3). However, FeCl2, FeCl3, CuI, and CuCl2 showed no effect in the reduction of 1.
THE SYNTHESIS OF 5-SUBSTITUTED PYRROLO[4,3,2-de]ISOQUINOLINE DERIVATIVES
Authors: Somei Masanori , Yamada Fumio , Kaneko Chikara
Published: July 2006

5-Substituted pyrrolo[4,3,2-de]isoquinolines, suitable intermediates for the synthesis of both 3,4-disubstituted indoles and Ergot alkaloids, were prepared from readily available 2-methyl-5-nitroisoquinolinium iodide.
REACTION OF CARBON DIOXIDE WITH EPOXIDES IN THE PRESENCE OF PENTAVALENT ORGANOANTIMONY COMPOUNDS
Authors: Matsuda Haruo , Ninagawa Akira , Nomura Ryoki
Published: July 2006

The reaction of carbon dioxide(CO2) with epoxides in the presence of pentavalent organoantimony compounds gave corresponding cyclic carbonates as a product in almost quantitative yields even under mild conditions.
THE SYNTHESIS OF d-EVALOSE
Authors: Yoshimura Juji , Hong Namgi , Sato Ken-ichi
Published: July 2006

d-Evalose (1: 6-deoxy-3-C-methyl-d-mannose) was synthesized from methyl 3, 3′-anhydro-4, 6-O-benzylidene-3-C-hydroxymethyl-2-O-methyl-α-d-mannopyranoside (3) through five-step derivations, and the structure was confirmed by the conversion into d-nogaloside (8: methyl 6-deoxy-3-C-methyl-2,3,4-tri-O-methyl-α-d-mannopyranoside).
A NEW PEPTIDE SYNTHESIS USING 3-(SUCCINIMIDOXY)-1,2-BENZOISOTHIAZOLE-1,1-DIOXIDE. APPLICATION TO SYNTHESIS OF LEUCINE-ENKEPHALIN
Authors: Inomata Katsuhiko , Kinoshita Hideki , Fukuda Hirohiko , Miyano Osamu , Yamashiro Yoshihiro , Kotake Hiroshi
Published: July 2006

3-(Succinimidoxy)-l,2-benzoisothiazole-l,1-dioxide was found to be a useful reagent to convert the carboxylic acids to the corresponding N-hydroxysuccinimide esters. Various dipeptides and leucine-enkephalin were prepared using the reagent in good yields.
A FACILE ROUTE TO CINNOLINES
Authors: Somei Masanori , Kurizuka Yoko
Published: July 2006

A general procedure for the synthesis of cinnolines from 1-aminoindoles has been established.
SYNTHESIS OF 7-AMINOMETHYL-7-DEAZAGUANINE, ONE OF THE NUCLEOSIDE Q (QUEUOSINE) PRECURSORS FOR THE POST-TRANSCRIPTIONAL MODIFICATION OF tRNA
Authors: Ohgi Tadaaki , Kondo Tadao , Goto Toshio
Published: July 2006

7-Aminomethyl-7-deazaguanine, which is one of the precursors of nucleoside Q (queuosine) biosynthesis, was synthesized from 2-methylthio-6-methoxy-7-methyl-7-deazapurine in 13 steps.
ON THE STRUCTURES OF ADDUCTS BETWEEN 3-METHOXYCARBONYLMETHYLENE-2-OXOINDOLINE AND CYCLOPENTADIENE
Authors: Okada Kunisuke , Sakuma Hiroteru , Inoue Shoji
Published: July 2006

The structure and stereochemistry of the Diels–Alder adducts between 3-methoxycarbonylmethylene-2-oxoindoline and cyclopentadiene are discussed on the basis of the spectral and chemical data.
SYNTHESIS OF [3.3](1,1’) AND [5.5](1,1’)FERROCENOPHANE DERIVATIVES
Authors: Kasahara Akira , Izumi Taeko , Shimizu Iwao
Published: July 2006

[3.3](1,1’) and [5.5](1,1’)Ferrocenophane derivatives with one or two olefinic linkages and one carbonyl group between ferrocene systems were synthesized by intermolecularly base-catalyzed condensation. The transannular π-electronic interaction between the olefinic groups were examined on the basis of electronic spectra.
CATALYTIC ACTIVITY OF VARIOUS 12-MOLYBDOPHOSPHATES FOR METHACROLEIN OXIDATION
Authors: Eguchi Koichi , Aso Isao , Yamazoe Noboru , Seiyama Tetsuro
Published: July 2006

12-Molybdophosphoric acid and its salts were examined as catalysts for methacrolein oxidation. The catalytic activity was strongly dependent on the kind of counter ion, the highest activity being attained by Co(II) salt. The effect of counter ion was well expressed in terms of ionic potential.
SYNTHESIS OF as-INDACENEBIS(CYCLOPENTADIENYLIRON)
Authors: Iijima Sei’ichiro , Motoyama Izumi , Sano Hirotoshi
Published: July 2006

Iron(II) chloride reacts with a mixture of lithium cyclopentadienide and dilithium as-indacenide in tetrahydrofuran to give asindacenebis(cyclopentadienyliron) (1). The results of NMR and solubility studies of (1) indicate that (1) is one of the new analogues of biferrocene or cyclopentadienyl(indenyl)iron rather than that of bis(as-indacenyliron).
REGIO- AND STEREOSPECIFIC Z-IODO - AND Z-BROMOCHLORINATION OF ALKYLPHENYLACETYLENES VIA Z-CHLOROTELLURATION
Authors: Uemura Sakae , Miyoshi Haruo , Okano Masaya
Published: July 2006

Reaction of alkylphenylacetylenes with tellurium(IV) tetrachloride in carbon tetrachloride gives Z-(2-chlorovinyl)tellurium (IV) trichloride derivatives in over 75% yield, which afford the corresponding Z-chloroiodoalkenes or Z-bromochloroalkenes in good yields by halogenodetelluration with iodine in acetonitrile or N-bromosuccinimide in carbon tetrachloride.
SYNTHETIC UTILITY OF ALLYLIC THIOLCARBAMATES. STEREOSELECTIVE SYNTHESIS OF SIMPLE NATURAL PRODUCTS INCLUDING OPTICALLY ACTIVE MANICONE AND β-SINENSAL
Authors: Mimura Tetsuya , Kimura Yasuhiro , Nakai Takeshi
Published: July 2006

Stereoselective syntheses of the two optically active pheromones of ants, (+)-(E)-4,6-dimethyl-4-octen-3-one (manicone) and (+)-(E)-2,4-dimethyl-2-hexenoic acid, and of β-sinensal and (E)-β-farnesene are described in which allylic thiolcarbamates readily derived from allylic alcohols via the [3,3]sigmatropic rearrangement were used as the key intermediates.
A NEW METHOD FOR SEQUENCE DETERMINATION OF PEPTIDE MIXTURES BY EDMAN-DEGRADATION AND FIELD DESORPTION MASS SPECTROMETRY
Authors: Shimonishi Yasutsugu , Hong Yeong-Man , Matsuo Takekiyo , Katakuse Itsuo , Matsuda Hisashi
Published: July 2006

A new method is described for sequencing of peptide mixtures by Edman-degradation and field desorption mass spectrometry. The principle is realized by measurement of the mass numbers of molecular or quasi-molecular ions of peptides and their fragments degraded by the Edman method and calculation of the mass difference.
CONVERSION AND STORAGE OF LIGHT ENERGY. EVOLUTION OF HYDROGEN IN NEUTRAL AQUEOUS SOLUTION BY A CATALYTIC ELECTRODE PROCESS
Authors: Kawai Tomoji , Tanimura Katsumi , Sakata Tadayoshi
Published: July 2006

Hydrogen was evolved from water by the photoelectrochemical reduction of methylviologen (MV2+) and the catalytic electron transfer from reduced MV+. to H+ in neutral aqueous solution. Taking advantage of this process, reduction of water into H2 by using a Zinc-tetraphenylporphine (ZnTPP) photoelectrode is suggested.
SYNTHESIS OF [2]PARACYCLO[2]PARACYCLO[2](1,8)-NAPHTHALENOPHANE-9-ENE-1,17-DIYNE
Authors: Kasahara Akira , Izumi Taeko , Katou Takao
Published: July 2006

[2]Paracyclo[2]paracyclo[2](1,8)naphthalenophane derivative having transannular π-electronic interactions was synthesized.
MOLECULAR COMPLEX OF TETRABENZOYLBENZENE AND DIALLENE
Authors: Toda Fumio , Tanaka Koichi , Tsukada Harumichi , Shimanouchi Hirotaka , Sasada Yoshio
Published: July 2006

Stable 1:1 complex of tetrabenzoylbenzene (1,2,4,5-tetrabenzoyl-3,6-di-t-butylbenzene, 1) and diallene (meso-3,8-di-t-butyl-1,5,6,10-tetraphenyldeca-3,4,6,7-tetraene-1,9-diyne, 2) was isolated and its structure was studied by X-ray analysis.
RAMAN AND INFRARED SPECTROSCOPIC STUDIES ON CONFORMATIONAL POLYMORPHISM OF N-PROPYL ACETATE
Authors: Ogawa Yoshiki , Tasumi Mitsuo
Published: July 2006

The Raman and infrared spectra of n-propyl acetate were observed at low temperatures and the results were analysed on the basis of normal-coordinate calculations. In two crystal modifications the molecules assume different conformations, namely, the trans–gauche form with respect to the two axes CH3(CO)O–CH2–CH2CH3 in Crystal I and the trans–trans form in Crystal II.
ETUDE DE LA CONDUCTION IONIQUE D’APATITES CONTENANT L’ION (ReO5)3− : Ba5(ReO5)3X (X=F, Cl, Br)
Authors: Besse Jean-Pierre , Baud Gilbert , Chevalier Raymond
Published: July 2006

The anionic conductivity of new halogenoapatites Ba5(ReO5)3X (X = F, Cl, Br) has been measured in the temperature range from 300°C to 700°C. The results are in good agreement with the coordination number and the size of mobile species.
THE REACTION OF α-IODOMERCURIC KETONES WITH NICKEL CARBONYL IN THE PRESENCE OF CARBONYL COMPOUNDS
Authors: Rhee Ilsong , Ryu Ilhyong , Omura Haruo , Murai Shinji , Sonoda Noboru
Published: July 2006

The reaction of a variety of α-iodomercuric ketones with nickel carbonyl was carried out in the presence of aldehydes or ketones to afford α,β-unsaturated ketones in good yields.
A SYNTHESIS OF 9(O)-METHANOPROSTACYCLIN
Authors: Konishi Yoshitaka , Kawamura Masanori , Arai Yoshinobu , Hayashi Masaki
Published: July 2006

The optically active 9(O)-methanoprostacyclin was synthesized from 1-2-oxa-3-oxo-6-syn-benzyloxymethyl-7-anti-(2-tetrahydropyranyloxy)-cis-bicyclo[3.3.0]octane or d-(2β-benzyloxymethyl-3α-hydroxy-4-cyclopenten-1α-y1)acetic acid, which are the general synthetic intermediates for natural prostaglandins.
TETRAMERS AS INTERMEDIATES IN SPECIFIC OXIDATION OF A PAIR OF ASSOCIATING THIOLS
Authors: Endo Tadashi , Takeda Yukiko , Orii Toyohiko , Kaneko Yuji , Kondo Michio
Published: July 2006

Tetramers composed of the associating thiols (1 and 2) were suggested to be intermediates in the specific oxidation of a 1:1 mixture of 1 and 2, based on spectroscopic studies, the behavior of the selectivity in this oxidation, the determination of degree of association, and so on.
ISOLATION AND STRUCTURES OF TWO NEW PYRAZINES, PALYTHAZINE AND ISOPALYTHAZINE FROM PALYTHOA TUBERCULOSA
Authors: Uemura Daisuke , Toya Yoshiaki , Watanabe Ichiro , Hirata Yoshimasa
Published: July 2006

Two new compounds possessing a pyrazine ring system were isolated from the zoanthid Palythoa tuberculosa. These compounds have now been named palythazine and isopalythazine and assigned to structures 1 and 2, respectively, by means of spectral analysis and synthesis.
HIGH-CONDUCTIVITY SOLID PROTON CONDUCTORS: DODECAMOLYBDOPHOSPHORIC ACID AND DODECATUNGSTOPHOSPHORIC ACID CRYSTALS
Authors: Nakamura Osamu , Kodama Teruo , Ogino Isao , Miyake Yoshizo
Published: July 2006

The electrical conductivities of dodecamolybdophosphoric acid H3Mo12PO40·29H2O and dodecatungstophosphoric acid H3W12PO40·29H2O crystals were measured. Remarkably high conductivities of 0.18 and 0.17 mho cm−1 at 25°C, and low activation energies of 15.5 and 13.7 kJ/mol were observed for the former and the latter, respectively.
PREPARATION AND SYNTHETIC UTILITY OF DIFLUOROKETENE THIOACETAL. A NOVEL SYNTHETIC ROUTE TOα-MONOFLUOROALKANOIC ACIDS
Authors: Tanaka Kiyoshi , Nakai Takeshi , Ishikawa Nobuo
Published: July 2006

Difluoroketene thioacetal (2) prepared from trifluoroacetaldehyde thioacetal (3) with lithium diisopropylamide or alkyllithiums has been shown to be useful as a building block for the preparation of α-monofluoroalkanoic acids (5), which involves the reaction of 2 with various organometallic compounds followed by hydrolysis of the resulting monofluoroketene thioacetal (4).
PREPARATION AND CYCLOADDITION REACTION OF 1-AMINO-2-AZABUTADIENE
Authors: Nomura Yujiro , Takeuchi Yoshito , Tomoda Shuji , Ito Masato M
Published: July 2006

2-Methyl-N-(1-phenylvinyl)-1-(1-pyrrolidinyl)-1-propanimine (1), a new type of 2-azabutadiene, was readily prepared by thermolysis of 5,5-dimethyl-3-(1-phenylvinyl)-4-(1-pyrrolidinyl)-Δ1-1,2,3-triazoline. Regioselective [4+2] cycloaddition reaction of 1 with some dienophiles afforded 2-isopropyl-6-phenylpyridine derivatives in decent yields.
FIRST SYNTHESIS OF PYRIDO[1′,2′:1,5]PYRAZOLO[3,4-b]PYRIDINE DERIVATIVE
Authors: Kakehi Akikazu , Ito Suketaka , Watanabe Kozo , Ono Tadashi , Miyazima Tomio
Published: July 2006

The treatment of 3-[2-cyano-2-(ethoxycarbonyl)ethenyl]-2-(ethylamino)pyrazolo[1,5-a]pyridine, obtainable from the reaction of the corresponding pyridinium salt with ethyl ethoxymethylenecyanoacetate in the presence of potassium carbonate, with strong base such as potassium t-butoxide gave a new condensed pyrazolopyridine derivative.
REDUCTION OF CARBONYL SUBSTRATES BY 3-CARBOXY-N-BENZYL-1,4-DIHYDROQUINOLINE: BIFUNCTIONALITY IN THE GENERAL-ACID CATALYZED NADH MODEL REDUCTION
Authors: Shinkai Seiji , Nakano Tetsuya , Hamada Hisatake , Kusano Yumiko , Manabe Osamu
Published: July 2006

The title NADH analogue acts as a bifunctional reducing reagent under appropriate reaction conditions. The remarkable efficiency of the intramolecular carboxyl group as general-acid was demonstrated.