bluuebunny/crossref_metadata_2025 huggingface dataset:
REACTIONS OF PHENYLPYRYLIUM FLUOROBORATES WITH PYRIDINIUM-N-IMINE
Authors: Toda Takashi , Morino Hisayo , Suzuki Yoshizo , Mukai Toshio
Published: July 2006

Reactions of phenylpyrylium fluoroborates with pyridinium-N-imine afforded 3-substituted 2-phenyl-pyrazolo[1,5-a]pyridine derivatives.
RADIATION-INDUCED CHAIN ISOMERIZATION OF cis-2-BUTENE IN BENZENE SOLUTION
Authors: Harata Yasuo , Matsui Masao , Imamura Masashi
Published: July 2006

Radiation-induced isomerization of cis-2-butene was found to proceed in benzene solution by an ionic chain mechanism when total radiation dose is low. The yield of trans-2-butene reaches 103 in G unit under optimum conditions. Scavenging studies indicate that charge transfer from benzene cations to cis-2-butene and direct isomerization of cis-2-butene cations take place. Outlines of the results are presented.
A HIGHLY STABLE WATER-INSOLUBLE DERIVATIVE OF RIBONUCLEASE T1
Authors: Ito Hisashi , Hagiwara Masaaki , Ichikizaki Iwao , Takahashi Kenji
Published: July 2006

A water-insoluble derivative of ribonuclease T1 (RNase T1) was prepared by chemically combining RNase T1 with a copolymer of acrylamide and divinylbenzene (Enzacryl AH), and its enzymatic properties were examined. The enzyme derivative retained much of its original activity and was considerably more stable to heat and extremes of pH than the native enzyme.
THE TRANSFORMATION OF JERVINE INTO TESTOSTERONE
Authors: Murai Akio , Iwasa Noriaki , Masamune Tadashi
Published: July 2006

The transformation of jervine into testosterone is described.
A NEW METHOD FOR THE PREPARATION OF α -HYDROXY KETONES
Authors: Takeda Takeshi , Ueda Masahiro , Mukaiyama Teruaki
Published: July 2006

Various α-hydroxy ketones were prepared in good yields by reduction of α-ethoxycarbonylhydrazono ketones with NaBH4, followed by acid hydrolysis. α-Ethoxycarbonylhydrazono ketones were obtained in good yields by the treatment of Δ2-1,3,4-oxadiazolines, prepared from 1-(2-oxoalkyl)pyridinium salts and diethyl azodicarboxylate, with aqueous sodium hydroxide.
STRUCTURE OF ALNUSERIC ACID, THE FIRST REPORTED NATURALLY OCCURRING C31-SECODAMMARANE-TYPE TRITERPENE FROM ALNUS SERRULATOIDES CALL.
Authors: Hirata Toshifumi , Ideo Reiko , Suga Takayuki
Published: July 2006

A novel C31-3,4-secodammarane-type triterpene, alnuseric acid, was isolated from the male flowers of Alnus serrulatoides Call. (Betulaceae). Its structure was elucidated to be (20S,24R)-20 ,24-epoxy-24-methyl-3,4-secodammar-4(28)-en-3-oic acid (I) by a combination of chemical and spectroscopic methods.
ENANTIOFACE DIFFERENTIATING ASYMMETRIC REACTION BY p-TOLYLSULFINYLCARBANION
Authors: Kunieda Norio , Kinoshita Masayoshi , Nokami Junzo
Published: July 2006

The enantioface differentiating reaction by p-tolylsulfinylcarbanion(2), derived from (+)-(R)-methyl p-tolyl sulfoxide (1), toward unsymmetrical ketones (3) is described. The carbanion(2) readily reacts with 3 to produce a mixture of (RSRC)- and (RSSC)-β-hydroxy sulfoxides (4). The ratio of the diastereoisomers in 4 and the absolute configuration of the predominant diastereoisomer were determined with the aid of NMR and the specific rotation of alcohol(6) which was prepared by desulfurization of 4.
ON THE BAND STRUCTURE CALCULATION FOR MOLECULAR CRYSTALS OF THE SPACE GROUP P21/a
Authors: Aikawa Yosihiro , Shimoda Haruhisa , Sukigara Mitsunori , Honda Kenichi
Published: July 2006

The energy band structure of molecular crystals belonging to the space group P21/a, originally derived by Katz et al., is not valid. The correct band structure is derived by taking explicitly the nonspherical property of molecule in molecular crystals into consideration and using symmetry operator.
MICROWAVE SPECTRA OF DISILYLMETHANE
Authors: Hayashi Michiro , Kuginuki Yusho
Published: July 2006

Microwave spectra of disilylmethane[(SiH3)2CH2] and its deuterated species[(SiD3)2CH2] were measured. A plausible structure of the molecule was estimated from the rotational constants determined. Dipole moments were determined by Stark effect measurements. They were 0.813±0.013 D for the normal species and 0.802±0.010 D for the deuterated species. From the observed splittings of the spectra for the normal species, the barrier to SiH3 internal rotation was determined to be 1210±20 cal/mol by neglecting the two top coupling terms.
CATALYTIC ACTIVITIES OF CATIONIC RHODIUM COMPLEXES FOR THE HYDROGENATION OF STYRENE OXIDE
Authors: Mochida Isao , Shirahama Shin-ichi , Fujitsu Hiroshi , Takeshita Kenjiro
Published: July 2006

Cationic rhodium complexes were found to show catalytic activity for the hydrogenation of styrene oxide under atmospheric hydrogen at 30°. The identified products were β-phenylethyl alcohol and phenylacetaldehyde, both of which were formed by the cleavage of the same carbon–oxygen bond. The yield of the alcohol reached up to 59% after 20 hrs’reaction. However, neither secondary alcohol nor ketone was detected.
PALLADIUM CATALYZED THIENYLATION OF ALLYLIC ALCOHOLS
Authors: Yoshida Zen-ichi , Yamada Yoshimi , Tamaru Yoshinao
Published: July 2006

3-(2-Thienyl)-aldehydes and ketones were prepared by catalytic reaction with palladium acetate from 2-bromothiophene and five kinds of allylic alcohols.
ASYMMETRIC CROSS ALDOL SYNTHESIS. ASYMMETRIC ADDITION OF SILYL ENOL ETHER AND KETENE SILYL ACETAL TO α-KETO ESTERS
Authors: Ojima Iwao , Yoshida Katsuhiko , Inaba Shin-ichi
Published: July 2006

Asymmetric cross aldol synthesis was carried out by the reaction of several silyl enol ethers and ketene silyl acetals with (−)-menthyl pyruvate and phenylglyoxylate. The extent of asymmetric induction realized in the reaction was determined to be in the range 18-68% by nmr using a shift reagent, Eu(fod)3, and was considerably larger than that observed in the reaction of the chiral α-keto esters with Grignard reagents.
DIANIONS OF ETHYL α-MERCAPTOACETATE AND ETHYL α-MERCAPTO-PROPIONATE: A NEW METHOD FOR AN EFFICIENT SYNTHESIS OF α,β-UNSATURATED ESTERS FROM CARBONYL COMPOUNDS
Authors: Tanaka Kazuhiko , Yamagishi Nobuyuki , Tanikaga Rikuhei , Kaji Aritsune
Published: July 2006

Ethyl α-mercaptoacetate and ethyl α-mercaptopropionate dianions were found to be useful reagents for the synthesis of α,β-unsaturated esters from carbonyl compounds by a single operation under mild conditions. Highly substituted α,β-unsaturated esters could be prepared by this method. The application to the synthesis of a component of ant mandibular gland secretions was described.
DETERMINATION OF THE APPARENT BINDING CONSTANT OF COBALT CARBONIC ANHYDRASE B BY THE KINETIC METHOD
Authors: Kidani Yoshinori , Hirose Junzo
Published: July 2006

The second order rate constant (kf) for the formation of Co(II) complex of bovine carbonic anhydrase and the first order rate constant (kd) for dissociation of the cobalt-carbonic anhydrase into apoenzyme and Co(II) ion were measured at 0° (pH 5.0) by a catalytic assay method involving p-nitrophenyl acetate as a substrate. The first order rate constant (kd) has been determined by use of a chelating agent as a scavenging agent for apoenzyme. Combination of kf with kd gives apparent binding constant (Kbind) for cobalt-carbonic anhydrase. This value (Kbind=kf/kd) was consistent with that obtained by the equilibrium dialysis.
A SYNTHESIS OF β-VETIVONE BY BASE-CATALYZED SPIROANNELATION OF PHENOLIC TOSYLATE
Authors: Uneyama Kenji , Okamoto Kaoru , Torii Sigeru
Published: July 2006

β-Vetivone 8 and C10-epimer were synthesized by base-catalyzed spiroannelation of phenolic tosylate 5.
PHOTOENOLIZATION OF 2-METHYLBENZOPHENONE
Authors: Uji-Ie Koji , Kikuchi Koichi , Kokubun Hiroshi
Published: July 2006

Two kinds of transient absorption spectra were obtained for the ethanol solution of 2-methylbenzophenone by conventional and laser flash photolysis. The short-lived transient was assigned to the cis-enol and the long-lived to the trans-enol. These transients arise separately from the different excited states.
THE WITTIG-TYPE AND THE CLAISEN REARRANGEMENT OF ALLYLIC 3-PHENYLTHLO-2-PROPEN-1-YL ETHERS
Authors: Wada Makoto , Fukui Akira , Nakamura Hideo , Takei Hisashi
Published: July 2006

Allylic 3-phenylthio-2-propen-1-yl ethers(3) underwent [2,3]-sigmatropic (Wittig-type) rearrangement by treatment of n-butyllithium in tetrahydrofuran (THF) at −40 ∼ −50°C to give the corresponding allylic alcohols (7). On the other hand, the allylic ethers 3 were treated with potassium tert-but oxide in tert-butyl alcohol-N,N-dimethylformamide (DMF) at room temperature to give the corresponding allylic enol ethers (12), which isomerized to the corresponding aldehydes (13) on heating in xylene by the Claisen rearrangement.
NEW HIGHLY STRAINED UNSATURATED PROPELLANES, [4.2.2]PROPELLA-2,4,7-TRIENES
Authors: Toda Fumio , Yoshioka Takayuki
Published: July 2006

Cycloaddition of tetracyanoethylene to the benzene nucleus of 2,7-di-tert-butyl-4,5,9,10-tetra(p-halophenyl)tricyclo[6.2.0.3,6]deca-1,3(6),4,7,9-pentaene (1) afforded the title propellane, 2,7-di-tert-batyl-11,11,12,12-tetracyano-4,5,9,10-tetra(p-halophenyl)tetracyclo[6.2.2.0.03,6]dodeca-2,4,6,9-tetraene (2).
A CONVENIENT METHOD FOR THE PREPARATION OF CARBODIIMIDES USING 2-CHLOROPYRIDINIUM SALT
Authors: Shibanuma Tadao , Shiono Manzo , Mukaiyama Teruaki
Published: July 2006

Aromatic and aliphatic carbodiimides are prepared in good yields by treating N,N′-disubstituted thioureas with 2-chloro-1-methylpyridinium salt in the presence of triethylamine.
MASS SPECTROMETRIC STUDY ON CHEMICAL TRANSPORT REACTION
Authors: Kyoto Michihisa , Bando Yoshichika , Takada Toshio
Published: July 2006

In order to study closed-tube chemical transport reaction process, a mass spectrometer was coupled to a reaction tube. The gases in the ZnO–NH4Cl transport reaction were analysed with this apparatus. The gas species were Zn, ZnCl2, N2, H2O, HCl, and NH3.
THIELE ACETYLATION OF p-TROPOQUINONE, AN ABNORMAL RING CONTRACTION
Authors: Hirama Masahiro , Itô Shô
Published: July 2006

Thiele type acylation reaction of p-tropoquinone 1, a novel nonbenzenoid quinone, in the presence of sulfuric acid, resulted in the unexpected ring contraction to a benzaldehyde derivative 2, in addition to a tropone 3. It was proved in this reaction that acetoxyl group attacked C3 exclusively and that the carbon became aldehydic. In the reaction catalyzed by BF3, regioselectivity of the nucleophilic attack was reduced to 4:1 (C3:C4) yielding 9, 10, and 11, all seven-membered ring compounds. Plausible mechanisms for the all reaction pathways are proposed.
NEW SYNTHETIC REACTIONS BASED ON 1-METHYL-2-FLUOROPYRIDINIUM SALTS. STEREOSPECIFIC PREPARATION OF PRIMARY AMINES FROM ALCOHOLS
Authors: Hojo Ko , Kobayashi Susumu , Soai Kenso , Ikeda Shigeru , Mukaiyama Teruaki
Published: July 2006

Treatment of various alcohols with 1-methyl-2-fluoropyridinium salt and lithium azide afforded corresponding alkyl azides, which were converted to primary amines by reduction. The overall reactions proceeded with inversion of configuration.
METALLOPORPHYRINS. II. SYNTHESIS AND VISIBLE SPECTRA OF BIS- AND TRIS-PORPHYRINS AND THEIR METAL COMPLEXES
Authors: Ichimura Kunihiro
Published: July 2006

The acyl chloride of monomethyl ester of mesoporphyrin-IX (6) was treated with porphyrins having monohydroxy and dihydroxy groups (3 and 4) to afford single-bridged bis- and trisporphyrins (7 and 10), respectively. The diacyl chloride of mesoporphyrin-IX (8) was treated with the dihydroxy porphyrins (4) to give double-bridged bisporphyrin (9). The visible spectra of the free base and the metal complexes of the multiporphyrins are found to be distinguishable from those of mesoporphyrin-IX dimethylester (5) and its metal complexes. The chromophores in the multiporphyrin systems interact strongly intramolecularly.
PHOTOUREIDOMETHYLATION OF CYANOBENZENES WITH TETRAMETHYLUREA
Authors: Tsujimoto Yuji , Hayashi Mitsunori , Nishimura Yoshiyuki , Miyamoto Takuji , Odaira Yoshinobu
Published: July 2006

Novel ureidomethylation to an aromatic ring occurred easily, when a mixture of tetramethylurea and cyanobenzenes in acetonitrile was irradiated.
DEMONSTRATION OF BASE-PAIRING BETWEEN 2-SUBSTITUTED ADENINE AND URACIL DERIVATIVES IN AQUEOUS AND NON-AQUEOUS SOLUTION
Authors: Higuchi Shigesada , Dezaki Youko
Published: July 2006

Interaction of 2-substituted adenine derivatives were studied spectrophotometrically. They are able to base-pair with uracil either of a polymerized form in aqueous solution or of a monomeric form in non-aqueous solution. The Hoogsteen type base-pairing is possibly formed between the 2-substituted adenine and uracil. A model is raised in which a conformational change of tRNA anticodon region occurs through the formation of base-pairing between the modified adenosine and uridine.
GERMANICOL, A NEW BACKBONE REARRANGEMENT PRODUCT OF 3β,4β-EPOXYERIEDELANE
Authors: Tori Motoo , Tsuyuki Takahiko , Takahashi Takeyoshi
Published: July 2006

Treatment of 3β,4β-epoxyfriedelane (2) with BF3–Et2O in benzene at room temperature gave germanicol (7; main product), besides the known rearranged products (4, 5, and 6). Germanicol is the first example of product in which a backbone rearrangement of friedelane-oleanane-type effected up to E-ring.
A NEW TRIAL FOR THE SYNTHESIS OF DIRECT DYES TO REPLACE BENZIDINE TYPE DYE (1)—TRISAZO DYES FROM 3,5-BIS(p-AMINOPHENYL)-1,2,4-TRIAZOLE, 2,5-BIS(p-AMINOPHENYL)-1,3,4-OXADIAZOLE AND 2,5-BIS(p-AMINOPHENYL)IMIDAZOLE
Authors: Yamase Iroh , Saito Gen-ichi , Kotone Akira , Konishi Kenzo , Kitao Teijiro
Published: July 2006

New trisazo dyes from 3,5-bis(p-aminophenyl)-1,2,4-triazole and 2,5-bis(p-aminophenyl)-1,3,4-oxadiazole which are found to have no toxicity and no carcinogenicity, and 2,5-bis(p-aminophenyl)imidazole have been prepared to replace benzidine type dye, Direct Deep Black EX. Dyeing with these dyes was carried out on cotton, silk, wool and 6-nylon. These dyes have been shown to have very good dye-ability and also to be very similar to benzidine type dye in colour and fastnesses to light and washing.
STRUCTURE OF ALNUSELIDE, THE FIRST REPORTED NATURALLY OCCURRING C31-SECODAMMARANE-TYPE TRITERPENE LACTONE FROM ALNUS SERRULATOIDES
Authors: Hirata Toshifumi , Ideo Reiko , Suga Takayuki
Published: July 2006

A novel C31-3,4-secodammarane-type triterpene lactone, alnuselide, was isolated from the male flowers of Alnus serrulatoides Call. (Betulaceae). The structure of alnuselide was elucidated to be (11R,20S,24R)-20,24-epoxy-24-methyl-3,4-secodammar-4(28)-en-3,11-carbolactone (I) by a combination of the chemical and spectroscopic methods and the synthesis.
A CONVENIENT METHOD FOR THE PREPARATION OF 3-SUBSTITUTED FURANS
Authors: Kotake Hiroshi , Inomata Katsuhiko , Aoyama Shin-ichi , Kinoshita Hideki
Published: July 2006

It was found that ethyl 4,4-dimethoxy-2-phenylthiobutyrate is an useful reagent for the preparation of 3-substituted furans from alkyl halides. 3-Benzylfuran, 3-geranylfuran (nordendrolasin), and 3-octadecylfuran were prepared by the method in good yields.
REACTIONS OF α-KETOSULFENES WITH CYCLIC NITRONES
Authors: Tsuge Otohiko , Noguchi Michihiko
Published: July 2006

Benzoylsulfene 1 and two cyclic α-ketosulfenes 2 and 3, generated in situ from the corresponding sulfonyl chlorides and triethylamine, react with 1-pyrroline 1-oxides to produce the corresponding cis-s-cis β-aminoenones and/or β-imino sulfonic acids, whose relative yields greatly depended on the nature of solvents employed. The reaction pathways are also described.
ASYMMETRIC REDUCTION OF ACETOPHENONE WITH CHIRAL HYDRIDE REAGENT PREPARED FROM LITHIUM ALUMINIUM HYDRIDE AND (S)-2-(ANILINOMETHYL)PYRROLIDINE
Authors: Mukaiyama Teruaki , Asami Masatoshi , Hanna Jun-ichi , Kobayashi Susumu
Published: July 2006

(S)-2-(Anilinomethyl)pyrrolidine (1), new chiral diamine, is easily prepared by four steps starting from (S)-proline. Asymmetric reduction of acetophenone with chiral hydride reagent, prepared from (1) and lithium aluminium hydride, gives (S)-1-phenylethanol in 92% optical yield (93% yield).
THE SYNTHESIS OF HIGHLY STABLE o- AND p-QUINONE METHIDES
Authors: Nakayama Jyuzo , Yamashita Kuniko , Hoshino Masamatsu , Takemasa Toshiro
Published: July 2006

The reactions of 2,4- and 2,6-disubstituted phenols with two molar amounts of 1,3-benzodithiolylium tetrafluoroborate in acetonitrile at room temperature followed by treatment with triethylamine afforded the highly stable quinone methides, 2-(1,3-benzodithiol-2-ylidene)-3,5-cyclohexadien-1-ones and 4-(1,3-benzodithiol-2-ylidene)-2,5-cyclohexadien-1-ones, respectively, in good yields.
EXTRACTION OF METAL IONS FROM TRICHLOROACETIC ACID SOLUTIONS TO POLAR SOLVENTS
Authors: Kiba Toshiyasu , Imura Hisanori , Honjo Takaharu
Published: July 2006

Cs(I), Ca(II), Ba(II), Co(II), Mn(II), Hg(II), Al(III), Cr(III), Fe(III), Tm(III), Bi(III) and Th(IV) in trichloroacetic acid-sodium trichloroacetate buffer solutions have been readily extracted with polar solvents which have donor oxygen atom, e.g. alcohols,ketones,esters and ethers, without any additional extracting reagent.
A NEW OXANYLATION OF ALCOHOLS UNDER NEUTRAL CONDITIONS
Authors: Abe Kyo , Sato Takanori , Nakamura Nobuo , Sakan Takeo
Published: July 2006

N-(2-Oxanyloxy)succinimide transfered its oxanyl group to alkoxide anions and carbanions to give oxanylated products (3a–3c and 5a–5d) under almost neutral condition.
EFFECT OF PRESSURE ON IODINE COMPLEX WITH DIETHYL ETHER IN n-HEPTANE
Authors: Sawamura Seiji , Taniguchi Yoshihiro , Suzuki Keizo
Published: July 2006

The equilibrium constant K and the volume change ΔV accompanying the formation of diethyl ether-iodine complex in n-heptane was estimated by measuring the visible absorption spectra up to 3300 bar at 25°C. The ΔV value of −6.7±1.0 cm3/mol accompanying the complex formation is comparable with that of −2.8 or −6.4 cm3/mol estimated by the X-ray data.
MONOALKYLATION OF METHYL CYANOACETATE AND ACETYLACETONE USING 1,8-DIAZA-BICYCLO[5.4.0]UNDECENE-7
Authors: Ono Noboru , Yoshimura Tetsuji , Tanikaga Rikuhei , Kaji Aritsune
Published: July 2006

A simple method for selective monoalkylation of methyl cyanoacetate and acetylacetone using 1,8-diaza-bicyclo[5.4.0]undecene -7(DBU) as a base is described.
ELECTROCHEMICAL PHOTOCELL USING SPRAYED CdS FILM ELECTRODE
Authors: Minoura Hideki , Nakamura Tsuyoshi , Ueno Yasusada , Tsuiki Masayasu
Published: July 2006

Photoelectrochemical studies of CdS film deposited by chemical spray deposition onto the glass substrate covered with a conducting SnO2 layer were performed in aqueous sulfide or polysulfide solution. Similar behavior to that obtained with a single crystal or a sintered CdS electrode was observed. It is concluded that this sprayed CdS film electrode can be effectively used as the anode of the electrochemical photocell, CdS/aqueous polysulfide electrolyte/Pt, in which CdS anode is illuminated through SnO2-coated glass.
STRUCTURE OF ALNUSEROL, THE FIRST REPORTED NATURALLY OCCURRING 11-HYDROXYLATED C31-DAMMARANE-TYPE TRITERPENE
Authors: Hirata Toshifumi , Murai Kyoko , Suga Takayuki , Christensen Arild
Published: July 2006

Molecular structure and absolute configuration of alnuserol, a novel C31-triterpene isolated from Alnus serrulatoides Call., were determined to be (20S,24R)-20,24-epoxy-11α-hydroxy-24-methyldammaran-3-one (I) by a combination of X-ray crystallography and circular dichroism measurements.
REACTIONS OF CARBON DIOXIDE WITH α-BROMOACYLOPHENONES: FORMATION OF OXAZOLIDONE DERIVATIVES
Authors: Toda Takashi
Published: July 2006

Reactions of carbon dioxide with α-bromoacylophenones in the presence of aliphatic primary amines in methanol afforded 3-alkyl-4-hydroxyoxazolidone-2 derivatives under mild conditions.
STEREOSELECTIVE HYDROGENATION OF UNHINDERED CYCLOHEXANONES TO AXIAL ALCOHOLS WITH RHODIUM CATALYST
Authors: Nishimura Shigeo , Ishige Masayoshi , Shiota Michio
Published: July 2006

Hydrogenation of unhindered cyclohexanones with rhodium catalyst in isopropyl alcohol or tetrahydrofuran in the presence of hydrochloric acid gives excellent yields of axial alcohols. Steroidal 3,17- and 3,20-diones are selectively hydrogenated at C-3 to give the corresponding 3-axial-hydroxy ketones in high yields.
MOLECULAR ORBITALS OF ANTIAROMATIC MOLECULES: CYCLIC POLYMETHINES (CH)3 and (CH)4
Authors: Yamaguchi Kizashi , Nishio Akinobu , Fueno Takayuki
Published: July 2006

The contour maps of the highest occupied (HO) corresponding orbitals (CMO) of cyclic polymethines (CH)n(n=3,4) are presented in order to clarify the electron localizations which are closely related with the electron destabilizations in antiaromatic molecules. The symmetry and stability of the HO CMO’s are also discussed in relation to the correlation effect between diradical electrons.
SYNTHESES OF [3.3]CYCLOPHANES
Authors: Otsubo Tetsuo , Kitasawa Masashi , Misumi Soichi
Published: July 2006

Two synthetic methods of [3.3]cyclophanes via dithia[4.4]cyclophanes are presented. Direct photodesulfurization method is generally successful except in the cases of metapara- and meta-cyclophanes which are prepared by pyrolytic method of bissulfone.
THE PHOTOCHEMICAL BEHAVIOR OF DI-μ-OXO-BINUCLEAR MANGANESE COMPLEXES IN ACIDIC SOLUTION
Authors: Otsuji Yoshio , Sawada Keizo , Morishita Isao , Taniguchi Yukio , Mizuno Kazuhiko
Published: July 2006

Di-μ-oxo-dimanganese complex [Mn2IV,IIIO2(bpy)4](Clo4)3, which is stable in the ground state, is reduced by irradiation of 313 nm light in acidic solutions. On the other hand, [Mn2IV,IVO2(phen)4](Clo4)4 is reduced in the dark to the MnIV–MnIII complex and then further reduced upon irradiation. The photoreductions of the complexes are accompanied by the one-electron oxidation of water to generate hydroxyl radical.
PHOTOREDUCTION OF 2-PIPERIDINOANTHRAQUINONE BY AN ELECTRON TRANSFER VIA THE UPPER EXCITED nπ* TRIPLET STATE
Authors: Inoue Haruo , Kawabe Kiyoshi , Kitamura Noboru , Hida Mitsuhiko
Published: July 2006

The photoreduction of 2-piperidinoanthraquinone (1) by an electron transfer from hydroxide ion in 4:1 2-propanol-water mixture was reinvestigated. The reaction proceeded on irradiation with the light of λ = 365 nm, but hardly did with that of λ>420 nm which excites (1) exclusively to the 1CT level. The fluorescence of (1) was not affected by hydroxide ion. 1,3-Cyclohexadiene as a triplet quencher retarded the photoreduction. The reactive state of (1) in the photoreduction was concluded to be not the intramolecular excited CT state, but the upper excited nπ* triplet state.
REACTIONS OF ISOCYANIDE-PALLADIUM(II) COMPLEXES WITH NITRILIMINES. NOVEL CYCLIC CARBENE-PALLADIUM(II) COMPLEXES
Authors: Hiraki Katsuma , Fuchita Yoshio , Morinaga Shigeki
Published: July 2006

cis-[PdCl2(PPh2R)(CN–C6H4–CH3–p)] (R=Ph or Et) reacted with nitrilimines, derived from N-phenylarylcarbohydrazonyl chlorides and triethylamine, to afford novel cyclic carbene-palladium(II) complexes, cis-[PdCl2(PPh2R){CN(C6H4–CH3–p)C(C6H4–R′−p)=N-NPh}].
PROPERTIES OF BENZANNELATED TRISDEHYDRO[10.10.2][14]ANNULENO[14]ANNULENES
Authors: Sakano Koichi , Akiyama Shuzo , Iyoda Masahiko , Nakagawa Masazumi
Published: July 2006

Increase of diatropicity of the dibenzotrisdehydro[14]annuleno[14]annulene as compared with that of benzotrisdehydro[14]annuleno[14]annulene, which is expected if the dibenzannulenoannulene is a peripheral conjugated system could not be observed. The observed NMR behavior seems to indicate that the dibenzo derivative is a fused system consisting of two 14π-electron systems.
EFFECT OF ALKYL SUBSTITUENTS ON CYCLOBUTYL-CYCLOPROPYLCARBINYL TYPE REARRANGEMENT OF 2-OXABICYCLO[4.2.0]OCTAN-3-ONES
Authors: Tobe Yoshito , Kakiuchi Kiyomi , Kawakami Yukio , Sakai Yasuo , Kimura Koji , Odaira Yoshinobu
Published: July 2006

Cyclobutyl-cyclopropylcarbinyl type rearrangement of 2-oxabicyclo[4.2.0]octan-3-ones and remarkable effect of alkyl substituents at the bridgehead positions on this rearrangement are described.
ACTIVE FIXED Mo CATALYSTS FOR OLEFIN METATHESIS AND CHEMICAL STATE OF THE ACTIVE SITE
Authors: Iwasawa Yasuhiro , Ogasawara Sadao , Soma Mitsuyuki
Published: July 2006

The fixed Mo catalysts with well-defined structures prepared by the facile reactions between Mo(χ-C3H5)4 and acidic OH groups of supports like γ-alumina, silica-alumina and silica, followed by the stoichiometric uptake of H2, O2 or Cl2, were very active for olefin metathesis, where the coordinatively unsaturated tetravalent Mo uniformly populated on the surface was found to be the actual active site.
A DUALITY OF MECHANISM IN THE HOMOLYTIC SUBSTITUTION REACTION OF ANTHRONE WITH 1-CYANO-1-METHYLETHYL RADICALS
Authors: Mitsuhashi Tsutomu , Oki Michinori
Published: July 2006

The mechanism of the homolytic substitution reaction of anthrone with 1-cyano-1-methylethyl radicals has been discussed on the basis of kinetic isotope effects as well as CIDNP. Under non-basic conditions the abstraction-combination mechanism is suggested, whereas the addition-disproportionation mechanism via anthranol prevails under basic conditions.
OXETANES DERIVED FROM N-METHYLGLUTARIMIDE AND THEIR ISOMERIZATION IN ACIDIC MEDIA
Authors: Maruyama Kazuhiro , Ogawa Takuji , Kubo Yasuo
Published: July 2006

Irradiation of an acetonitrile solution of N-methylglutarimide 3 and an olefin 4 gave oxetanes 5 in a high yield. The oxetanes 5 were converted smoothly to homoallyl alcohols, 3,4-dihydro-6-(2-hydroxyalkyl)-1-methyl-2(1H)-pyridones 6 by refluxing in acidic media.
DETERMINATION OF RADIOACTIVE RARE GASES BY SOLVENT EXTRACTION FOLLOWED BY γ-RAY SPECTROMETRY
Authors: Yanokura Minoru , Horiuchi Kimiko , Nakahara Hiromichi , Murakami Yukio
Published: July 2006

Low levels of radon in various samples such as natural waters and the non-condensable gas from geothermal wells were extracted with toluene, and submitted to γ-ray spectrometry. This extraction method remarkably improved the detection limit so that identification and determination of low level radioactive rare gases became feasible.
PHOTOLYSIS AND THERMOLYSIS OF 2,2-DIPHENYL-2-HYDROXYETHYL-BIS(DIMETHYLGLYOXIMATO)PYRIDINE COBALT(III), 2,2-DIPHENYL-2-HYDROXYETHYL COBALOXIME
Authors: Tada Masaru , Okabe Masami , Miura Kyo
Published: July 2006

Photolysis of 2,2-diphenyl-2-hydroxyethyl cobaloxime in the absence of oxygen gave deoxybenzoin, with phenyl rearrangement, and 1,1-diphenylethanol, with hydrogen abstraction, in various solvents. Thermolysis gave the similar results but the formation of 1,1-diphenylethylene becomes a major process.
SYNTHESIS OF BrMe2Sn–Mn(CO)3(PPh3)2 BY AN UNUSUAL METHYL ELIMINATION REACTION FROM Me3SnBr IN THE PRESENCE OF [Mn(CO)3(PPh3)2]− ANION AND ITS CRYSTAL STRUCTURE ANALYSIS
Authors: Onaka Satoru
Published: July 2006

A reaction of the title anion with Me3SnBr at reflux temperature in THF gave unexpected BrMe2Sn–Mn(CO)3(PPh3)2 in low yield. Its characterization and crystal structure are described.
IMPROVED MODIFIED RANEY NICKEL CATALYST FOR ENANTIOFACE-DIFFERENTIATING (ASYMMETRIC) HYDROGENATION OF METHYL ACETOACETATE
Authors: Harada Tadao , Izumi Yoshiharu
Published: July 2006

The enantioface-differentiating ability of the modified Raney nickel was enhanced by the use of an inorganic salt as an ingredient of the modifying solution. An optical yield of near 90 % was attained in the hydrogenation of methyl acetoacetate to methyl 3-hydroxybutyrate when tartaric acid and sodium bromide were chosen as the modifying reagents.
EFFECT OF PHENOL DERIVATIVE ON THE SELECTIVITY OF ORGANIC SULFONATE SELECTIVE ELECTRODE
Authors: Fujinaga Taitiro , Okazaki Satoshi , Hara Hirokazu
Published: July 2006

The interference of inorganic anions such as perchlorate,thiocyanate, and iodide against p-toluenesulfonate selective electrode decreased remarkably by the addition of p-t-octylphenol in o-dichlorobenzene medium. After infrared investigations, this phenomenon was attributed to the presence of hydrogen bonding between p-t-octylphenol and p-toluenesulfonate.
ISOLATION OF RISHITIN-M-1 FROM DISEASED POTATO TUBER TISSUE SLICES
Authors: Masamune Tadashi , Murai Akio , Takahashi Yu-koh , Yagihashi Fujio , Katsui Nobukatsu , Doke Noriyuki , Tomiyama Kohei
Published: July 2006

Isolation of rishitin-M-1, a metabolite of rishitin produced in healthy tissues of white potato, from diseased potato tuber slices and its convenient preparation from rishitin are described.
SHAPE-SELECTIVE CRACKING OF OCTANES OVER PARTIALLY CATION EXCHANGED H-MORDENITE
Authors: Namba Seitaro , Yashima Tatsuaki
Published: July 2006

Cracking of octanes over H–Y, H-mordenite, and partially cation exchanged H-mordenite was carried out. It was found that the original reactivities of octanes were 3-methylheptane > 2,2,4-trimethylpentane >> octane and in the case of H-mordenite the order changed to octane>> 3-methylheptane > 2,2,4-trimethylpentane. By the partial cation exchange only 2,2,4-trimethylpentane reactivity was decreased with the ionic radius of exchanged cation.
FERROMAGNETIC SPIN-EXCHANGE INTERACTION IN COPPER(II)–OXOVANADIUM(IV) COMPLEXES WITH 3-FORMYLSALICYLIC ACID-DIAMINE SCHIFF BASES. THE IMPORTANCE OF GROUND ELECTRONIC CONFIGURATION IN SPIN–SPIN COUPLING
Authors: Torihara Naoyuki , Okawa Hisashi , Kida Sigeo
Published: July 2006

Copper(II)-oxovanadium(IV) hetero-metal binuclear complexes with 3-formylsalicylic acid-diamine Schiff bases were prepared and their magnetic properties were explored in the temperature range 78–300°K. They obeyed the Curie–Weiss law (χM=C/(T-θ)) with positive Weiss constant (θ=18∼20°K), indicating ferromagnetic spin-exchange interaction between the metal ions. The magnetic properties of the present complexes were discussed in comparison with those of Cu(II)–M(II) complexes with the same ligands.
PALLADIUM CATALYZED REACTION OF BUTADIENE WITH ALCOHOLS USING ALKYL- AND ARYLSULFINATES AS COCATALYSTS
Authors: Tamaru Yoshinao , Kagotani Masahiro , Suzuki Ryoshu , Yoshida Zen-ichi
Published: July 2006

Sodium alkyl- and arylsulfinates serve as excellent cocatalysts for the palladium catalyzed dimerization of butadiene in alcohols to give 2,7-octadienyl alkyl (Me, Et, Pr, and i-Pr) ethers selectively together with small amounts of 2,7-octadienyl sulfones. 1,3,7-Octatriene is formed in less than 4% yield.
ANOMALOUS LIGHT SCATTERING OF POLY(2-METHYL-5-VINYLPYRIDINE) IN NITROETHANE
Authors: Sakamoto Noriyuki , Aramatsu Keisuke , Toki Kenji
Published: July 2006

The peculiar anomalous light scatterings have been repeatedly observed for poly(2-methyl-5-vinylpyridine) in nitroethane, which were suppressed by the addition of tetramethylammonium iodide. Such behaviors were found due to the intermolecular interference caused by some ionization of the polymer in the solution.
THE SYNTHESIS OF USEFUL CHIRAL PROSTANOID INTERMEDIATES AND NATURALLY OCCURRING PROSTAGLANDINS FROM AUCUBIN
Authors: Naruto Masanobu , Ohno Kiyotaka , Naruse Norio
Published: July 2006

The synthesis of optically active intermediate 9 for prostanoids from aucubin 1 was described, in which stepwise cleavage of intramolecular cyclic acetal of tetrahydroanhydroaucubigenin 2 by ethanethiol in the presence of boron trifluoride was successfully accomplished. The synthesis of naturally occurring prostaglandins was also described.
POLYMERIZATION OF METHYL METHACRYLATE INITIATED WITH VANILLIN
Authors: Imoto Minoru , Maeda Takamasa , Ouchi Tatsuro
Published: July 2006

Vanillin was found to initiate the polymerization of methyl methacrylate(MMA) in benzene at 85 °C. The effects of the concentrations of vanillin and MMA on the rate of polymerization and on the degree of polymerization of poly-MMA were investigated. A probable initiation mechanism proposed. The polymerization is assumed to proceed through a radical mechanism. The polymeric effect of the polymer containing vanillin units was also studied.
SYNTHESIS AND PYROLYTIC DECARBONYLATION OF 4-CYCLOPENTENE-1,2,3-TRIONE
Authors: Kasai Masaji , Oda Masaji , Kitahara Yoshio
Published: July 2006

4-Cyclopentene-1,2,3-trione 1 is synthesized by either dehydration of 2,2-dihydroxy-4-cyclopentene-1,3-dione 4 or pyrolysis of 2-chloro-2-formyloxy-4-cyclopentene-l,3-dione 5 Pyrolysis of 1 gives the bis-ketene 6 by decarbonylation, which is confirmed by ring closure to cyclobutenedione 2 as well as by trapping with methanol or hydrogen chloride.
COOPERATIVE INCORPORATION OF POTASSIUM AND NITROGEN INTO METALLIC RUTHENIUM
Authors: Ohya Asao , Urabe Kazuo , Ozaki Atsumu
Published: July 2006

Nitrogen uptake by metallic ruthenium is enhanced by the presence of potassium vapor, simultaneously increasing the stable incorporation of potassium, demonstrating a “binder action” of nitrogen. The molar ratio of nitrogen uptake to the stable potassium suggests a chemical formula (KN2Ru)n, as supported by formation of hydrazine on hydrolysis.
SYNTHESIS AND PROPERTIES OF DIAMINOCYCLOPROPENYLIDENE TRANSITION METAL COMPLEXES
Authors: Konishi Hisatoshi , Matsumoto Shiro , Kamitori Yasuhiro , Ogoshi Hisanobu , Yoshida Zen-ichi
Published: July 2006

Neutral and cationic diaminocyclopropenylidene complexes of palladium (II) and platinum (II), trans-X2-μ-X2M2II(C3(NR2)2)2, (2; M=Pd, 3; M=Pt) , cis-R3′PX2MIIC3(NR2)2 (4; M=Pd), and [trans-(R3′P)2 XMIIC3(NR2)2]+ClO4− (5; M=Pd, 6; M=Pt) were synthesized. Stereochemistry of the peripheral dialkylamino groups was briefly discussed on the basis of infrared and 13C-nmr spectra. Low C–N stretching frequency and small rotational barrier about the C–N bond indicate that diaminocyclopropenylidene coordinates to the transition metal as a carbene.
THE SYNTHESIS OF dl-5-ACETYL-2-(1-HYDRXYMETHYLVINYL)-2,3-DIHYDROBENZOFURAN AND ITS ESTERS
Authors: Kawase Yoshiyuki , Yamaguchi Seiji , Kondô Seizô , Shimokawa Keiko
Published: July 2006

dl-Tremetone, synthesized conveniently from phenol in two steps, was oxidized by selenium dioxide in acetic anhydride to give dl-5-acetyl-2-(1-acetoxymethylvinyl)-2,3-dihydrobenzofuran, which was hydrolized to dl-form of the natural alcohol. The dl-alcohol was further esterified to dl-forms of the two natural esters.
ACID-CATALYZED [4+2]CYCLOADDITION BETWEEN ENAMINES AND BENZYLIDENEANILINES. SYNTHESIS OF 1,2,3,4-TETRAHYDROQUINOLINE DERIVATIVES
Authors: Nomura Yujiro , Kimura Muneaki , Takeuchi Yoshito , Tomoda Shuji
Published: July 2006

The enamines having an α-hydrogen, R1R2N-αCH=βCR3CH3, reacted with a variety of benzylideneanilines to provide the [4+2] cycloadducts, 1,2,3,4-tetrahydroquinoline derivatives, in acetic acid or in methanol containing a catalytic amount of p-toluenesulfonic acid in considerable yield.
FUNCTIONALIZATION OF AN UNACTIVATED CARBON ATOM IN A TRITERPENE BY DRY OZONATION. A FORMATION OF 15- AND 16- OXOFRIEDELATES
Authors: Akiyama Eri , Tada Masahiro , Tsuyuki Takahiko , Takahashi Takeyoshi
Published: July 2006

Dry ozonation of friedelane (1) afforded 18β,19β-epoxyfriedelane (2), 19-oxofriedelane (3), 16-oxofriedelane (5), and a new carbonyl compound, 15-oxofriedelane (4). On SeO2 oxidation, 4 and 5 gave the same 15 ,16-dioxofriedelane (6).
EFFECTS OF α- AND β-CYCLODEXTRINS ON BASE-CATALYZED ISOMERIZATION OF PROSTAGLANDIN A1 AND PROSTAGLANDIN A2
Authors: Uekama Kaneto , Hirayama Fumitoshi , Daiguji Masanori
Published: July 2006

Both α- and β-cyclodextrins (α-CyD, β-CyD) increased the isomerization rates of A-type prostaglandins (prostaglandin A1 and prostaglandin A2) in alkaline condition, where acceleration effect of α-CyD was somewhat different from that of β-CyD. Importance of the spacial relationship between host and guest molecules was reflected in kinetically determined formation constants, activation parameters, and thermodynamic parameters for inclusion complex formation.
LIMONOIDS FROM MELIA AZEDARACH LINN. VAR.JAPONICA MAKINO. III. THE STRUCTURES OF OHCHINAL AND OHCHININ ACETATE
Authors: Ochi Masamitsu , Kotsuki Hiyoshizo , Kataoka Toshiko , Tada Tetsuro , Tokoroyama Takashi
Published: July 2006

Two new limonoids, ohchinal and ohchinin acetate, have been isolated from the fruit of M. azedarach Linn. var. japonica Makino and their structures established as 1 and 2 on the basis of chemical and spectroscopic evidence.
IONIC DISSOCIATION CONSTANT OF TRIETHYLAMINE IN METHANOL UNDER HIGH PRESSURE AT 25°C
Authors: Inoue Hisayuki , Hara Kimihiko , Osugi Jiro
Published: July 2006

The ionic dissociation constant of the ionization of triethylamine in methanol have been determined from the measurements of electrical conductivities at high pressures up to 2000 kg/cm2 at 25°C. The observed dissociation constant increased from 0.50×10−6 mol/kg at 1 atm to 5.78×10−6 mol/kg at 2000 kg/cm2, and its pressure dependence was quantitatively explained by the change of intrinsic volume and electrostrictive volume with pressure.
ACID-CATALYZED CYCLIZATION OF 6,7-EPOXYHUMULA-2,9-DIENE. FORMATION OF 5,9-DIHYDROXY-4,8,11,11-TETRAMETHYLTRICYCLO[6.3.0.02,4]UNDECANE
Authors: Namikawa Misuzu , Murae Tatsushi , Takahashi Takeyoshi
Published: July 2006

Treatment of 6,7-epoxyhumula-2,9-diene (1) with 1.8 M H2SO4–Me2CO (1:1) at room temperature gave a novel tricyclic diol shown to be 5,9-dihydroxy-4,8,11,11-tetramethyltricyclo [6.3.0.02,4]undecane (8a; diol B), besides tricyclohumuladiol (2; diol A), humulenol-II (3), a diol C (4a), a diol D (4b), and an acetonide (7), while the same reaction at O °C yielded only 2. The results together with a time-dependent product analysis showed the initial formation of 2, which then transformed into 3, 4a, 4b, 7, and 8a.
1-FORMYLCYCLOHEPTATRIENE. SYNTHESIS BY VILSMEIER REACTION AS NOVEL DIRECT SUBSTITUTION OF CYCLOHEPTATRIENE AND ITS SEVERAL REACTIONS
Authors: Asao Toyonobu , Kuroda Shigeyasu , Kato Kazuo
Published: July 2006

1-Formylcycloheptatriene was obtained by Vilsmeier reaction as novel direct substitution of cycloheptatriene accompanying bitropyl. Reduction, Grignard reaction and condensation reaction of the formyl compound were investigated.
THE MOLECULAR STRUCTURE OF METHYLPHENYL(DIPHENYLSULFILIMINO)SULFONIUM PERCHLORATE
Authors: Nishikawa Yasuo , Matsuura Yoshiki , Kakudo Masao , Akasaka Takeshi , Furukawa Naomichi , Oae Shigeru
Published: July 2006

The structure of the titled compound (I) has been determined by X-ray crystallographic techniques. (I) crystallizes in a triclinic space group P\bar1 with a=9.98, b=11.06, c=9.71 Å, α=81.0, β=76.1, γ=75.3° and Z=2. The cationic charge of (I) localizes predominantly on the sulfur atom (S(2)) of methyl phenyl sulfide. The bond length between the nitrogen atom and the sulfur atom (S(1)) of diphenyl sulfide is shorter than that of N-S(2) (1.60 and 1.67 Å, respectively).
ANODIC OXIDATION OF 4-ALLYL-2-METHOXYPHENOL SYNTHESES OF DEMETHOXYASATONE AND DEMETHOXYISOASATONE
Authors: Iguchi Masanobu , Nishiyama Atsuko , Terada Yukimasa , Yamamura Shosuke
Published: July 2006

Anodic oxidation of 4-allyl-2-methoxyphenol was carried out under various conditions, using an undivided cell, to afford two dienones (3 and 4) and two dimeric compounds (5 and 6). The dienone (4) was readily converted into demethoxyasatone (6), which was further subjected to photochemical reaction giving demethoxyisoasatone (7) in a good yield.
A SYNTHESIS OF DIASTEREOMERS OF (±)-LABDA-7,14-DIEN-13-OL THROUGH STEREOSPECIFIC CYCLIZATION OF FARNESYL PHENYL SULFONE
Authors: Torii Sigeru , Uneyama Kenji , Kawahara Ichiro , Kuyama Manabu
Published: July 2006

The cyclization of farnesyl phenyl sulfone 1 by treatment with SnCl4 in benzene gave a drimane-type compound 2, which was converted to diastereomers of (±)-labda-7,14-dien-13-ol 3.
ABNORMAL THERMAL EXPANSION AND SOLID-STATE RACEMIZATION OF COBALOXIME COMPLEX CRYSTAL
Authors: Ohashi Yuji , Sasada Yoshio , Ohgo Yoshiaki
Published: July 2006

The crystals of R-α-cyanoethyl(S-α-methylbenzylamine)cobaloxime exhibit abnormally anisotropic thermal expansion coefficients. The racemization of the cyanoethyl group in the crystalline state by X-ray exposure [Ohashi and Sasada, Nature, 267, 142 (1977)], is no longer observed below 173K. From structure analyses at 173K and room temperature, the mechanism of the racemization has been made clear.
RESTRICTED ROTATION INVOLVING THE TETRAHEDRAL CARBON.XXI. DIRECT OBSERVATION OF HINDERED ROTATION ABOUT A Csp3–C(=O) BOND IN PERISUBSTITUTED 9-(1-METHOXYCARBONYL-1-METHYLETHYL)TRIPTYCENES BY 1H NMR SPECTRA
Authors: Otsuka Soichi , Kihara Hiroshi , Mitsuhashi Tsutomu , Oki Michinori
Published: July 2006

The methoxyl protons of the dl form of the title compound which carries a chloro group in one of the peri positions show a broad signal in 1H NMR spectra at room temperature. The phenomenon is attributed to slow rotation about the Cα–C(=O) bond in the ester moiety by DNMR study. A similar phenomenon is observed with the dl form of the triptycene bearing a methyl group, but neither of the meso forms of triptycenes show splitting of the methoxyl signal. Activation parameters are obtained by total line-shape analysis.
EFFECTS OF SOLVENTS ON THE ENANTIOFACE-DIFFERENTIATING (ASYMMETRIC) ADDITION OF BUTYLLITHIUM TO BENZALDEHYDE USING (2S, 2′S)-2-HYDROXYMETHYL-1-[(1-METHYLPYRROLIDIN-2-YL)METHYL]PYRROLIDINE AS A CHIRAL LIGAND
Authors: Soai Kenso , Mukaiyama Teruaki
Published: July 2006

Effects of solvents were examined on the enantioface-differentiating addition of butyllithium to benzaldehyde using (2S, 2′S)-2-hydroxymethyl-1-[(1-methylpyrrolidin-2-yl)methyl]pyrrolidine as a chiral ligand. Very high optical purity (95%) was attained when the addition was carried out in a 1:1 mixture of dimethoxymethane and dimethyl ether at −123°C.
ISOTOPE EFFECTS IN THE EMISSION CROSS SECTION OF THE BALMER LINES (β,γ,δ) PRODUCED BY CONTROLLED ELECTRON IMPACT ON HCl AND DCl
Authors: Ogawa Teiichiro , Higo Morihide , Toyoda Minoru , Ishibashi Nobuhiko
Published: July 2006

The relative emission cross section (σD⁄σH) of the excited hydrogen and deuterium atoms produced in the dissociative excitation of HCl and DCl by 300 eV electrons revealed an isotope effect, which varied with the principal quantum number of the excited atoms.

σD⁄σH β:0.83±0.04, γ:0.87±0.04, δ:0.93±0.05.
MÖSSBAUER SPECTROSCOPIC STUDY ON THE MIXED- AND AVERAGED-VALENCE FERROCENE DERIVATIVES
Authors: Motoyama Izumi , Watanabe Masanobu , Sano Hirotoshi
Published: July 2006

Mixed-valence compound of diferrocenylacetylene and averaged-valence compound of [2.2]ferrocenophane-1,13-dxyne were prepared by the reaction of the corresponding neutral compounds with iodine in benzene. The Mössbauer results have clearly shown that strong interactions through the conjugated π-systems between two iron atoms are present in the latter compound.
ALDOL CONDENSATION WITH COPPER(II) COMPLEX CATALYSTS. MODEL REACTIONS OF CLASS II ALDOLASE
Authors: Irie Kazuo , Watanabe Ken-ichi
Published: July 2006

The aldol condensation of benzaldehyde with 2-butanone, catalyzed by 2,2′-bipyridine or ethylenediamine copper(II) complexes, afforded the regioselective reaction product at the C1-position of 2-butanone. The yield and regioselectivity of the aldol condensation was affected by the ligand species and numbers of ligand molecule.
STEREOSPECIFICITY AND REGIOSELECTIVITY OF CYCLOADDITION REACTIONS OF o-THIOQUINONE METHIDE
Authors: Okazaki Renji , Kang Kyung-Tae , Sunagava Kazuhiko , Inamoto Naoki
Published: July 2006

o-Thioquinone methide reacted with maleonitrile, fumaronitrile, methyl vinyl ketone, and acrylamide to give [4+2] cycloadducts. The former two reactions proceeded stereospecifically and the latter two regioselectively. The mode of these reactions are compared with those of the reactions with an enamine and of dimerization.
PREPARATION AND PROPERTIES OF METHYL-SUBSTITUTED BENZANNELATED BISDEHYDRO[13]ANNULENONES
Authors: Ojima Juro , Fujiyoshi Masamitsu
Published: July 2006

Preparation of methyl-substituted monobenzo- 5, 6, and dibenzobisdehydro[13]annulenone 7 is described. The influence of methyl substituent and benzannelation upon the structure and tropicity of bisdehydro[13]annulenone is discussed.
ANALYSIS OF ETHYL NITRATE BY CHEMICAL IONIZATION MASS SPECTROMETRY
Authors: Suzuki Shin , Koga Osamu , Das Rebati C
Published: July 2006

Mass spectrometry by chemical ionization using CH4 and iso-C4H10 is found to be very suitable for identification and quantitative analysis of ethyl nitrate necessary for air-pollution study. It produces protonated molecular ion which is not obtained in the electron impact method.
CHEMOSELECTIVE REACTIONS OF ALLYLSILANES WITH 1,1-DIMETHOXYBUTAN-3-ONE AND 1,1-DIMETHOXYPROPAN-2-ONE
Authors: Ojima Iwao , Kumagai Miyoko
Published: July 2006

The reaction of allylsilanes with 1,1-dimethoxybutan-3-one was found to proceed selectively on the acetal moiety regardless of the kind of Lewis acid, while the chemoselectivity of the corresponding reaction with 1,1-dimethoxypropan-2-one was changed dramatically by the sort of Lewis acid employed.
CONVENIENT SYNTHETIC METHODS OF SOME FUNCTIONALIZED INDOLIZINES
Authors: Kakehi Akikazu , Ito Suketaka , Maeda Toshiake , Takeda Ryoichi , Nishimura Masao , Yamaguchi Tetsuya
Published: July 2006

The thermolyses of 2-allylidene-1-ethoxycarbonylmethyl-1,2-dihydropyridines gave the corresponding 3-ethoxycarbonylindolizine with elimination of methylene compounds, and their reactions with acetic anhydride afforded 2-acetoxy-1-ethenylindolizines.
HYDROGEN PEROXIDE OXIDATION OF CYCLOHEXANONE AND CYCLOHEXANONE PEROXIDE IN THE PRESENCE OF SOME METAL OXIDES
Authors: Ishii Yasutaka , Adachi Akihiko , Imai Ryoichi , Ogawa Masaya
Published: July 2006

Cyclohexanone was oxidized to 1-hydroxy-1′-hydroperoxydicyclohexyl peroxide(HHP) by TeO2- and to adipic acid by H2MoO4 and H2WO4. The oxidation products from cyclohexanone. 1-Hydroxy-1-hydroperoxycyclohexane(HHC) was proposed as a reaction intermediate.
LOW TEMPERATURE CONVERSION OF PENTANE WITH ALUMINUM CHLORIDE–METAL SULFATE MIXTURES
Authors: Ono Yoshio , Tanabe Tadashi , Kitajima Nobumasa
Published: July 2006

The mixtures of aluminum chloride and metal sulfate are found to be effective catalysts for the conversion of pentane at low temperatures. For example, when 10 ml of pentane was shaked with the equimolar mixture of AlCl3 and Ti2(SO4)3 (7.5 mmol each) at 28 °C for 3 hr, the pentane conversion of 46 % was obtained with the selectivity to isopentane of 84 %. In the vapor phase conversion, however, the main product was found to be isobutane.
OPTICAL RESOLUTION OF 2-AMINOETHYL-n-BUTYLPHENYLPHOSPHINE AND THE BIS(ACETYLACETONATO)COBALT(III) COMPLEX CONTAINING THE RESOLVED AMINOPHOSPHINE
Authors: Kashiwabara Kazuo , Kinoshita Isamu , Fujita Junnosuke
Published: July 2006

2-Aminoethyl-n-butylphenylphosphine was resolved. A pair of diastereomers of the bis(acetylacetonato)cobalt(III) complex with the resolved aminophosphine was isolated and absolute configurations of the complexes and the aminophosphine were assigned on the basis of the 1H-NMR and circular dichroism spectra of the diastereomers.
β-DIKETONATE DIANION AS A BRIDGING OR C,O-CHELATING LIGAND
Authors: Okeya Seichi , Yanase Norio , Nakamura Yukio , Kawaguchi Shinichi
Published: July 2006

The 2,4-pentanedionate dianion acts as a bridging ligand in [Be(acac)L] and [Pd(acac)L] which were prepared by the reactions of (2,2′-bipyridine)chloro(2,4-pentanedionato-C1 )palladium(II) (HL) with [Be(acac)2] and [Pd(acac)2]. On the other hand the 1,1,1-trifluoro-2,4-pentanedionate dianion is chelating to the metal atom in [Pt(C5H3O2F3)L2′] (L′= PPh3 and AsPh3).
THE PFEIFFER EFFECT WITH A DISSYMMETRIC METAL COMPLEX AS AN ENVIRONMENT SUBSTANCE. II. POSSIBILITY TO PREDICT THE ABSOLUTE CONFIGURATION OF METAL COMPLEXES
Authors: Wada Yoshiaki , Miyoshi Katsuhiko , Yoneda Hayami
Published: July 2006

The chiral equilibrium of [Cr(ox)3]3− was found to be displaced in favor of its Δ-enantiomer when its racemate was mixed with the Λ-enantiomers of several complexes of the type cis-[Co(en)2(X)(Y)]n+ in dioxane-water mixtures. It was proposed that the Pfeiffer effect is useful to infer the absolute configuration of these Co(III) complexes.
COPPER-CATALYZED AMINATION OF α-SUBSTITUTED ANTHRAQUINONES
Authors: Yoshida Katsuhira , Matsuoka Masaru , Ueyama Tamio , Yamashita Yoshio , Kitao Teijiro
Published: July 2006

The reaction of 1-aminoanthraquinone with large excess of butylamine in the presence of various copper salts gave 1-amino-4-butylaminoanthraquinone in 15–40% yield. 1,4-Dihydroxyanthraquinone was also aminated at β-position in the same condition. Nucleophilic amination catalyzed with the copper salts of α-substituted anthraquinones was proposed.