bluuebunny/crossref_metadata_2025 huggingface dataset:
AN ABNORMAL CIAISEN REARRANGEMENT OF 5-HYDROXY-7-CINNAMYLOXY-2-METHYLCHROMONE
Authors: Jain A C , Gupta R K
Published: July 2006

The Claisen rearrangement of 5-hydroxy-7-cinnamyloxy-2-methyl chromone (2) has yielded 4′,5′-dihydro-5-hydroxy-2,4′-dimethyl-5′-phenyl-furo (2′,3′:7,8) chromone (6) as established by its NMR spectrum and that of its acetate and methyl ether. The pathway of its formation presumably has structures 3 to 5.
THE REACTION OF CARBONYLHYDRIDOFERRATE(O) IN APROTIC SOLVENTS. I. HYDROACYLATION OF α,β-UNSATURATED CARBOXYLIC ESTERS
Authors: Mitsudo Take-aki , Watanabe Yoshihisa , Yamashita Masakazu , Takegami Yoshinobu
Published: July 2006

α,β-Unsaturated carboxylic esters selectively insert into the hydrogen-iron bond of [FeH(CO)4]− in an aprotic solvent under an ambient condition to give an alkyl–iron complex, which gives a hydroacylated product by treatment with alkyl iodide.
THE IMPORTANCE OF INTRAMOLECULAR CHARGE TRANSFER EFFECT ON THE MOLECULAR CONFIGURATION OF p-NITROBENZYLIDENE-p-DIMETHYLAMINOANILINE
Authors: Ezumi Kiyoshi , Nakai Hiroshi , Sakata Shigeru , Nishikida Koichi , Shiro Motoo , Kubota Tanekazu
Published: July 2006

The structure of p-nitrobenzylidene-p-dimethylaminoaniline [I] was determined as planar transconfiguration. This is quite different from the structure of benzylideneaniline etc., which are not planar. It is stressed that the intramolecular charge transfer interaction between the substituents in [I] may play an important role for the configuration.
BINUCLEAR COPPER(II) COMPLEX BRIDGED WITH ALKYLAMINE OXIDE, BIS[BIS(2-AMINOETHYL)METHYLAMINE OXIDE]DICOPPER(II) PERCHLORATE
Authors: Tanaka Mitsunori , Okawa Hisashi , Miyashita Ryozo , Kida Sigeo
Published: July 2006

A copper(II) complex of bis(2-aminoethyl)methylamine oxide was synthesized and characterized by elemental analyses, magnetic susceptibility measurements, and IR and electronic spectroscopies. The compound has the binuclear structure bridged with alkylamine oxide. It has a distinct absorption in the near-ultraviolet region(31×103 cm−1) which was assigned to the characteristic CT band of oxygen-bridged copper(II) complexes.
LANTHANUM FLUORIDE CERAMIC MEMBRANES AS SELECTIVE ELECTRODE FOR FLUORIDE ION
Authors: Hirata Hiroshi , Ayuzawa Masatake
Published: July 2006

A new type of fluoride ion-selective ceramic membrane electrode was developed by using lanthanum fluoride, europium fluoride and calcium fluoride. The membrane was prepared by sintering at a temperature higher than 1200°C in an atmosphere of hydrogen fluoride gas stream. Satisfactory response characteristics were obtained over the concentration range of 10−1 to 10−6M.
ABNORMAL REACTIONS OF GRIGNARD REAGENTS WITH 2, 4, 6-TRI-t-BUTYLNITROBENZENE
Authors: Okazaki Renji , Inagaki Yoshio , Inamoto Naoki
Published: July 2006

The reactions of 2,4,6-tri-t-butylnitrobenzene with the Grignard reagents give rise to products derived from an attack of the latter onto the ortho- and the para-positions to the nitro-group.
PREPARATION OF OPTICALLY ACTIVE CATION EXCHANGERS WITH l-TARTRATE GROUPS AND ITS APPLICATION TO THE RESOLUTION OF [Co(en)3]3+ ION
Authors: Fujita Miho , Yoshikawa Yuzo , Yamatera Hideo
Published: July 2006

Two types of optically active Sephadex cation exchangers, in which l-tartrate groups were linked to form ether or ester, were prepared by simple methods for the first time. These cation exchangers were effectively applied to a direct chromatographic resolution of [Co(en)3]3+.
OXIDATION OF 4-ALKYL-HYDROXYIMINO-2,4,6-TRI-t-BUTYL-2,5-CYCLOHEXADIENES. CONVENIENT METHOD FOR THE PREPARATION OF 4-ALKYL-2,6-Di-t-BUTYLNITROBENZENES
Authors: Okazaki Renji , Inagaki Yoshio , Inamoto Naoki
Published: July 2006

Reactions of 4-alkyl-l-hydroxyimino-2,4,6-tri-t-butyl-2,5-cyclohexadienes with silver oxide or nickel “peroxide” give 4-alkyl-2,6-di-t-butylnitrobenzenes, which are otherwise inaccessible without difficulty, in good yields.
MÖSSBAUER MEASUREMENTS OF IRON ATOMS DISPERSED IN AMORPHOUS GLASSLIKE CARBONS
Authors: Yajima Seishi , Omori Mamoru
Published: July 2006

Various iron species have been prepared by pyrolyzing acetylferrocene-furfural resins at 400°C in vacuum, and analysed by means of Mössbauer spectroscopy. The Mössbauer spectra show that the iron species in an amorphous glasslike carbon matrix are free iron atoms, Fe+ ions, iron clusters, superparamagnetic irons and ferromagnetic irons.
CONDENSATION REACTION OF 2-METHYLAZULENE DERIVATIVES WITH BENZALDEHYDE; FORMATION OF 2-STYRYLAZULENES
Authors: Saito Motoyasu , Morita Tadayoshi , Takase Kahei
Published: July 2006

2-Methylazulene derivatives, possessing electron-withdrawing substituents, such as alkoxycarbonyl or cyano group, at the 1- and/or 3-positions, were reactive to undergo condensation reaction with benzaldehyde, in the presence of sodium alkoxide, yielding 2-styrylazulene derivatives, from which 2-styrylazulene itself could be derived by removal of the substituents.
SYNTHESIS OF TAXODIONE AND METHYL 11-HYDROXY-12-METHOXY-7-OXOABIETA-8,11,13-TRIEN-18-OATE
Authors: Matsumoto Takashi , Ohsuga Yasuo , Fukui Kenji
Published: July 2006

Oxidation of methyl 12-hydroxyabieta-8,11,13-trien-18-oate (X), prepared from (−)-abietic acid (II), with benzoyl peroxide gave methyl 11-benzoyloxy-12-hydroxyabieta-8,11,13-trien-18-oate (XII), which was converted to natural taxodione (I) and methyl 11-hydroxy-12-methoxy-7-oxoabieta-8,11,13-trien-18-oate (XI).
SOLID-LIKE WATER IN CETYL ALCOHOL
Authors: Murase Norio , Gonda Kinji , Kagami Ikuzo , Koga Shozo
Published: July 2006

Addition of a small amount of water to cetyl alcohol caused a marked increase of electrical conductivity in the α-state. Deuteron magnetic resonance spectra for the hydrated specimens indicate that the water molecules are contained in a solid-like state and enhance the protonic conduction presumably by the Grotthus mechanism.
THE OBSERVATION OF CADMIUM ATOMS IN THE STATE OF 5 3P0
Authors: Takaoka Motoaki , Yamamoto Shunzo , Tsunashima Shigeru , Sato Shin
Published: July 2006

The 5 3P0 state of cadmium atoms produced in the Cd-photosensitized reactions of Ar, N2, and NH3 has been observed by the absorption at the wavelengths of 340.4 nm (5 3D1–5 3P0) and 467.8 nm (6 3S1–5 3P0). The pressure dependence is displayed.
A CONVENIENT METHOD FOR THE SYNTHESES OF 2(1H)-IMIDAZOLONE DERIVATIVES
Authors: Taguchi Takeo , Sato Yoshinari , Watanabe Kenzo , Mukaiyama Teruaki
Published: July 2006

It was established that N-protected 2(1H)-imidazolone derivatives are conveniently prepared by the reaction of benzyl N-potassium-N-cyanocarbamate [Ia] or ethyl N-potassium-N-cyanocarbamate [Ib] with α-halo carbonyl compounds. N-Protecting group, benzyloxycarbonyl or ethoxycarbonyl group, was easily removed either by hydrogenation on Pd–C or alkaline hydrolysis to afford 2(1H)-imidazolone in good yields.
CATALYSIS AND COORDINATIVE UNSATURATION OF THE SULFURATED NICKEL SURFACE
Authors: Takeuchi Atsushi , Tanaka Ken-ichi , Miyahara Koshiro
Published: July 2006

Sulfurated nickel is catalytically inactive for the hydrogenation of olefin but active for the isomerization of butene and the C2H4–C2D4 exchange reaction in coexistence of hydrogen.

On contaction with acetylene, the surface becomes active for the hydrogenation of olefin and the H2–D2 equilibration as well as the hydrogenation of acetylene. These characteristics are well described by the degree of coordinative unsaturation of active sites suggested by Siegel.
INTERMEDIATES IN THE PHOTOCHEMICAL REACTIONS OF CAMPHORQUINONE WITH ALIPHATIC ALDEHYDES
Authors: Maruyama Kazuhiro , Takahashi Tomoji
Published: July 2006

The dynamic aspects of photochemical reactions of camphorquinone with aliphatic aldehydes were investigated by means of CIDNP. Besides that the two types of stable products (1)–(3) could be produced through ionic rearrangement of unstable intermediates (6), (7) arose from radical pair (5), the reverse hydrogen atom abstraction reaction was found to occur between the two radicals resulted from the reaction of photo-excited camphorquinone and aldehyde.
A GRAPH THEORETICAL DERIVATION OF THE ISOMERS OF TRICYCLIC HYDROCARBONS
Authors: Tanaka Nobuhide , Iizuka Takeshi , Kan Tadayoshi
Published: July 2006

The isomers of tricyclic hydrocarbons CnH2n−4 having neither side chains nor multiple bonds have been classified into 12 classes from a graph theoretical point of view. We have also found an algorithm for deriving all the structures and the numbers of the isomers, and as an example, we show all the skeletons and the indices of the isomers in the class for C10H16 to which Adamantane belongs.
EQUILIBRIUM OF THE ADDUCT FROM TRIBUTYLPHOSPHINE AND PHENYL ISOTHIOCYANATE AND 31P-NMR CHEMICAL SHIFTS OF THE ADDUCTS FROM TRIBUTYLPHOSPHINE AND ISOTHIOCYANATES
Authors: Akiba Kin-ya , Yoneyama Toshio , Inamoto Naoki
Published: July 2006

Equilibrium constants of the adduct (3c) from tributylphosphine (4) and phenyl isothiocyanate (5c) were measured in some solvents and 31P-NMR chemical shifts of the adducts (3) from (4) and isothiocyanates (RNCS) (5) were measure in DMF and correlated linearly with the σp values of the R groups.
SYNTHESIS AND ABSOLUTE CONFIGURATION OF TRANS-MERANZINIC ACID
Authors: Matsumoto Takashi , Fukui Kenji , Nanbu Mutsumu
Published: July 2006

Trans-meranzinic acid, (+)-II, was synthesized from 2-hydroxy-4-methoxy-3-(3-methylbut-2-enyl)benzaldehyde (V) via (±)-2,3-dihydro-7-formyl-2-(1-hydroxy-1-methylethyl)-4-methoxybenzofuran (VII) and (±)-II which was successfully resolved by means of cinchonidine. Subsequently, (+)-II was subjected to exhaustive ozonolysis to afford known (+)-(R)-3-hydroxy-4,4-dimethylbutyrolactone (X). Thus, the stereochemistry of C-2 in (+)-II was assigned as R-configuration.
A CONVENIENT METHOD FOR THE PREPARATION OF 1-PHENYLTHIO-1,3-BUTADIENE DERIVATIVES
Authors: Kuwajima Isao , Sugimoto Kosaku , Murofushi Toshiaki
Published: July 2006

1-Phenylthio-1,3-butadiene derivatives were prepared in good yield via 1,2-elimination reaction of acetoxy and phenylthio group by treating the corresponding 1-[bis(phenylthio)methyl] allyl acetate with dialkylcopper lithium.
CHANGE OF FAR-INFRARED SPECTRA OF β-HYDROQUINONE CLATHRATE OF ACETONITRILE WITH TIME
Authors: Fukushima Kunio
Published: July 2006

Far-infrared spectra of β-hydroquinone clathrate of acetonitrile were found to change with time. The change is explained by decomposition of β-hydroquinone clathrate of acetonitrile into α-hydroquinone.
FORMATION OF STEROIDAL SKELETON FROM RESIN ACID
Authors: Tahara Akira , Shimagaki Masayuki , Kenkyusho Rikagaku , Itoh Masayoshi , Harigaya Yoshihiro , Onda Masayuki
Published: July 2006

Dehydroabietic acid (1) was converted into 14 and 20 having the steroidal skeleton, by the use of its isopropyl group for the formation of the steroidal d-ring.
MAGNETIC QUENCHING OF FLUORESCENCE OBSERVED WITH CARBON DISULFIDE EXCITED BY A NITROGEN LASER
Authors: Matsuzaki Akiyoshi , Nagakura Saburo
Published: July 2006

Fluorescence from the 1A2 state of CS2 was found to be quenched by a magnetic field. This is the first observation of the magnetic quenching of emission from the excited singlet state. The quenching was found to be due to the enhancement of intramolecular nonradiative energy transfer by a magnetic field.
INDUCED CIRCULAR DICHROISM OF RACEMIC METHYLCYCLOHEXANONES INCLUDED IN β-CYCLODEXTRIN
Authors: Otagiri Masaki , Ikeda Ken , Uekama Kaneto , Ito Osamu , Hatano Masahiro
Published: July 2006

When cyclohexanone and its methyl derivatives were included in the cavities of cyclodextrins, the induced circular dichroism (CD) bands were observed in the absorption region of n-π* transition of the carbonyl chromophore. The sign of induced CD band of 2-methylcyclohexanone included in β-cyclodextrin was same as that of resolved R-isomer. From these observations the mode of inclusion and structure of β-cyclodextrin complex with methylcyclohexanone were discussed.
SOLVENT SHIFT INDUCED BY HEXAFLUOROBENZENE IN NMR SPECTRA
Authors: Nikki Kunio , Nakagawa Naoya
Published: July 2006

NMR solvent shifts induced by C6F6 have been interpreted as resulting from a dipole-quadrupole interaction.
PHOTO-INDUCED ISOMERIZATION OF 2-ACYL-3-METHYL-1,4-NAPHTHOQUINONE-2,3-EPOXIDE
Authors: Maruyama Kazuhiro , Arakawa Seiiti
Published: July 2006

2-Acyl-3-methyl-1,4-naphthoquinone-2,3-epoxide(1) isomerizes photochemically to give lactone. The spectral data and chemical reactions of the lactone are compatible with structure(2). Photochemical reaction of (1) with xanthene was also described.
A NOVEL TYPE OF ADDUCTS IN THE PHOTOCHEMICAL REACTIONS OF o-CHLORANIL WITH ALDEHYDES
Authors: Maruyama Kazuhiro , Miyazawa Toshifumi , Kishi Yasuo
Published: July 2006

Photochemical reactions between o-chloranil and aldehydes were extensively studied. In the reactions with iso-butyraldehyde and 2-ethylbutyraldehyde, photo-adducts of a novel type proved to be produced. The structure of these photo-adducts determined by IR, PMR, and mass spectra, and by elemental analysis was compatible with 3,3-dialkyl-5,6,7,8-tetrachloro-2,3-dihydro-1,4-benzodioxin-2-ol (II).
BIOTIN SYNTHESIS. I. SYNTHESIS OF 4-(4-CARBOXYBUTYL)-1,2-DIHYDROTHIENO[3,4-d]IMIDAZOL-2-ONE
Authors: Taguchi Takeo , Sato Yoshinari , Watanabe Kenzo , Mukaiyama Teruaki
Published: July 2006

4-(4-Carboxybutyl)-1,2-dihydrothieno[3,4-d]imidazol-2-one [I], a precusor of dl-biotin, was synthesized via 6 steps starting from 4-methyl-2(1H)-imidazolone.
SYNTHESIS OF γ-LACTONES BY THE CONDENSATION OF 2-ALKENE-1,4-DIOLS WITH ORTHOCARBOXYLIC ESTERS
Authors: Kondo Kiyosi , Mori Fumio
Published: July 2006

Various γ-lactones bearing vinylic substituent on β-position were obtained directly by the thermal condensation of trans-2-alkene-1,4-diols with orthocarboxylic esters in the presence of a catalytic amount of hydroquinone or phenol.
SYNTHESES OF 8-(1,2,3,4-TETRACHLOROFULVEN-6-YL)HEPTAFULVENE AND 8-(9-FLUORENYLIDENE)METHYLHEPTAFULVENE
Authors: Kuroda Shigeyasu , Oda Masaji , Kitahara Yoshio
Published: July 2006

Treatment of [2-(2,3,4,5-tetrachloro-1,3-cyclopentadienyl)vinyl]tropylium fluoroborate 9 with bases gave 8-(1,2,3,4-tetrachlorofulven-6-yl)heptafulvene 4. In similar way 8-(9-fluorenylidene)methyl heptafulvene 5 was also prepared. 4 is more polar than 5 is, but is less stable. Both 4 and 5 easily gave [8+2] cycloadducts with tetracyanoethylene.
AN IMPROVED ROUTE TO NICKEL(0) CARBONYL DERIVATIVES WITH TERTIARY PHOSPHINE
Authors: Tanaka Koji , Kawata Yasuo , Tanaka Toshio
Published: July 2006

L2NiCl2 (L2= 2Ph3P, 2MePh2P, Ph2PCH2CH2PPh2, and Ph2PCH=CHPPh2) reacts with carbon monoxide in the presence of MeSNa in ethanol to give L2Ni(CO)2 and dimethyldisulfide. (Ph3P)2Ni(CO)2 is also synthesized by the reaction of NiCl2·6H2O with Ph3P, MeSNa, and carbon monoxide. The pathway of these reactions is described.
THE SYNTHESIS OF S-PHENYL NUCLEOSIDE PHOSPHOROTHIOATES
Authors: Hata Tsujiaki , Sekine Mitsuo
Published: July 2006

A convenient method for the synthesis of S-phenyl nucleoside phosphorothioates by the reaction of nucleotides with diphenyl disulfide in the presence of tri-n-butylphosphine is described.
SYNTHESES OF POSITION ISOMERS OF DI-t-BUTYL-DIPHENYLDIDEHYDRO[14]ANNULENE AND A DIMETHOXY DERIVATIVE
Authors: Nomoto Tateo , Nakatsuji Shin’ichi , Nakagawa Masazumi
Published: July 2006

Two position isomers of di-t-butyl-diphenyldidehydro[14]annulene have been prepared according to a stepwise sequence of reactions and their physical properties were compared with those of another position isomer, 3,10-di-t-butyl-7,14-diphenyl-1,8-didehydro[14]annulene. The synthesis of 3, 10-di-t-butyl-6,13-dimethoxy-7,14-diphenyl-1,8-didehydro[14]annulene has been performed. The introduction of methoxy groups causes a hypsochromic shift with hypochromism and a bathochromic shift with strong hyperchromism of medium and longest wavelength bands of the electronic spectrum, respectively.
THE PHOTOLYSIS OF BENZYL AMINOACETATES
Authors: Kimoto Koichi , Tanabe Kunsei , Saito Shin , Umeda Yasusi , Takimoto Yasuyuki
Published: July 2006

The photolysis of benzyl aminoacetates (1a–1d) in benzene gave β-aminoethylbenzenes (2a–2d) and N,N-disubstituted glycines (3a–3d). Benzyl acetate (4) was also obtained in low yield. Solvent and quenching effect suggest the singlet pathway for this photoreaction.
PHOTOCHEMICAL CONVERSION OF 8-THIABICYCLO[3,2,1]OCT-3-EN-2-ONES INTO BRIDGED 3-THIETANONE DERIVATIVES
Authors: Tsuruta Haruki , Ogasawara Mitsuo , Mukai Toshio
Published: July 2006

A peculiar 3-thiethanone (III) was produced by the irradiation of cyclic β-ketosulfide (I). Upon treating with acid, III regenerate I, while with methanol, III afforded 4-thiacyclohept-5-enone (V). The photoreaction of II was also studied. The mechanisms of these reactions are discussed here.
ELECTRONIC ABSORPTION SPECTRA OF ANION RADICALS OF DIPHENYL SULFONE AND DIBENZOTHIOPHENE-S,S-DIOXIDE
Authors: Ito Osamu , Matsuda Minoru
Published: July 2006

The anion radicals of diphenyl sulfone and dibenzothiophene-S,S-dioxide produced by γ-irradiation showed intense absorption bands at 1030 nm and 850 nm, respectively. These absorption bands were assigned to the charge resonance bands from the energy diagrams including d-orbitals on sulfone groups, and the delocalization of an added electron on both phenyl rings was confirmed.
SYNTHESIS OF SILYL RUTHENIUM COMPLEXES, RuH3(SiR3)(PPh3)3
Authors: Kono Hiromichi , Nagai Yoichiro
Published: July 2006

Hydrosilanes react with RuH2(PPh3)4 to give RuH3(SiR3) (PPh3)3, where R3 = Et3, EtMe2, PhMe2, (EtO)3, Et2.H, PhMe.H, Ph2.H, Ph.H2 and cyclo-C6H11.H2. These apparently seven-coordinate silyl ruthenium(IV) complexes were characterized by i.r. and n.m.r. spectra.
9,10,13-TRIHYDROXY-11,15-OCTADECADIENOIC ACID AND RELATED FATTY ACIDS IN THE ROOTS OF KIDNEY BEAN (PHASEOLUS VULGARIS L., “BENI-KINTOKI”)
Authors: Takasugi Mitsuo , Anetai Masaki , Masamune Tadashi
Published: July 2006

In connection with studies on characterization of natural hatching-stimulants of soybean cyst nematode eggs, several fatty acids were isolated newly from the roots of kidney bean and identified as 4-hydroxy-1,12-dodecanedioic acid γ-lactone, 9,10,13-trihydroxy-11-and 15-octadecenoic acids, and 9,10,13-trihydroxy-11,15-octadecadienoic acid.
ALNUSERRUDIOLONE, A NEW C31-DAMMARANE-TYPE TRITERPENE FROM ALNUS SERRULATOIDES CALL.
Authors: Suga Takayuki , Hirata Toshifumi , Iwata Nobuo
Published: July 2006

The structure of alnuserrudiolone, a new C31-dammarane-type triterpene isolated from the male flowers of Alnus serrulatoides Call. (Betulaceae), has been elucidated to be (20s)-12β,20-dihydroxy-24-methylene-dammaran-3-one (I) by a combination of chemical and spectroscopic methods.
REACTION OF 2-PHENYL-1-AZIRINE WITH COPPER BROMIDES. SELECTIVE FORMATION OF TWO TYPES OF BROMO-DIMERIC COMPOUNDS DEPENDING ON THE SOLVENTS
Authors: Hayashi Ken-ichi , Isomura Kazuaki , Taniguchi Hiroshi
Published: July 2006

Treatment of 2-phenyl-1-azirine in cyclohexane with Cu(II) bromide afforded ω-bromoacetophenone azine, but in carbon tetrachloride gave 2-bromomethyl-2,4-diphenyl-2H-imidazole via 2-bromo-3,5-diphenyl-1,4-diazabicyclo[3.1.0]hex-3-ene.
REACTION OF THIOPHENE WITH ATOMIC HYDROGEN IN GAS PHASE
Authors: Horie Osamu , Hanh Nguyen H , Amano Akira
Published: July 2006

Thiophene was subjected to the reaction with hydrogen atom under reduced pressure in the temperature range of 300 – 70°K using a discharge-flow reactor. Butadiene, butenes, n-butane, propylene, and C2 hydrocarbons are the main products, and no formation of sulfur-containing products other than hydrogen sulfide is observed.
MCD STUDIES OF o,o′-BRIDGED BIPHENYLS
Authors: Tajiri Akio , Uchimura Hiroyuki , Hatano Masahiro
Published: July 2006

The magnetic circular dichroism (MCD) spectra of o,o′-bridged biphenyls were measured, at room temperature, in the wavelength regions of 200 nm to 350 nm. They all showed the Faraday B terms caused by a magnetic coupling of the lower-lying non-degenerate electronic states. A careful inspection of the MCD spectra with the aid of the results of the CNDO calculations led to preferable spectroscopic assignments of the absorption bands of o,o′-bridged biphenyls.
ON THE LUMINESCENCE LIFETIMES AND THEIR PRESSURE EFFECT OF SOME ONE-DIMENSIONAL Pt-COMPLEXES
Authors: Hara Yoji
Published: July 2006

The luminescence lifetimes in K2Pt(CN)4·3H2O, BaPt(CN)4·4H2O and MgPt(CN)4·7H2O were measured at 1 atom. and higher hydrostatic pressures up to 7.2 kbar at room temperature. Two longer components lengthen anomalously by a factor of ∼ 30 with a decrease in the Pt–Pt distance from 3.50 to 3.16 Å.
LIQUID PHASE REDUCTION OF NO TO N2 BY USE OF TRANSITION METAL-SCHIFF’S BASE COMPLEXES
Authors: Sakai Tomoya , Kuroda Yoshitaka , Goto Seiichi , Yano Yoshio
Published: July 2006

Catalytic actions of several transition metal-Schiff’s base complexes were examined on the reduction of NO to N2 in DMF solution. By use of Co(II)(Salen) or Fe(II)(Salen) and NaBH4 as a reducing reagent, thorough reduction of NO to N2 was observed.
RING CLEAVAGE REACTION OF CERTAIN 5,6-DIHALO-SUBSTITUTED-2-NORBORNENEOXIDES
Authors: Yanagida Yuji , Sakon Yutaka , Nomura Masakatsu , Kikkawa Shoichi
Published: July 2006

Ring cleavage reactions of trans- and endo-cis-5,6-dichloro-(or dibromo-) 2-norbornene oxides by hydrogen halides have been investigated. Normal trans ring cleaved products were obtained in the case of trans-5,6-dihalonorbornene oxides, while the cleavage reaction of endo-cis-5,6-dihalonorbornene oxides gave the abnormal cleaved products via transannuler rearrangement of endo halogen substituent toward the resulting carbonium ion.
EVIDENCE FOR THE BIOGENESIS OF HALOGENATED MYRCENES FROM THE RED ALGA CHONDROCOCCUS HORNEMANNI
Authors: Burreson B Jay , Woolard Frank X , Moore Richard E
Published: July 2006

Several new halogenated monoterpenes (3–6,10–15) have been isolated from Hawaiian Chondrococcus hornemanni which suggest that the halogenated myrcenes are formed by the enzymatic addition of BrCl followed by dehydrohalogenation.
NATURE OF THE EXCITED TRIPLET STATES IN THE PHOTOLYSIS OF O-ACYLOXIMES
Authors: Yoshida Masayuki , Sakuragi Hirochika , Nishimura Toshihiro , Ishikawa Shun-ichi , Tokumaru Katsumi
Published: July 2006

The triplet states of O-acyl aromatic ketoximes, RCO2N=CR1R2 (I, II, and III), undergo homolytic cleavage into iminyl radicals, R1R2C=N·, and acyloxyl radicals, RCO2·. The triplet states have their excitation energies which are close to those of their parent ketones, R1R2C=O, and are abundant in π,π* character. The excitation energies are dissipated through cleavage of the N–O bonds.
POLAROGRAPHIC STUDIES ON REDOX REACTIVITY OF POLYMER–HEMIN COMPLEX IN A HYDROPHOBIC MICROENVIRONMENT
Authors: Tsuchida Eishun , Honda Kenji
Published: July 2006

When hemin was bound to partially quaternized polyvinylpyridine and such additives as sodium chloride, sodium lauryl sulfate and polymethacrylic acid were added, it was possible to lower the redox potential of the central ferric ion of hemin and to control the redox reactivity of hemin arbitrarily owing to the change in the property of microenvironment around hemin.
A NEW SYNTHESIS OF VITAMIN A
Authors: Mukaiyama Teruaki , Ishida Akihiko
Published: July 2006

A new synthesis of vitamin A was successfully accomplished by reducing retinal, prepared by the reaction of 3-methyl-1-trimethylsiloxy-1,3-butadiene (III) with β-ionylideneacetaldehyde dimethyl acetal (VII) followed by the elimination of methanol with tertiary amine such as 1,5-diazabicyclo[5.4.0]undecene-5. The intermediate, β-ionylideneacetaldehyde (V), was also prepared according to the same procedure starting from β-cyclocitral dimethyl acetal (II).
CATALYTIC CONVERSION OF PROPYLENE INTO ACETYLENE AND BUTADIENE OVER ION-EXCHANGED ZEOLITES
Authors: Mochida Isao , Ikeda Yoshimasa , Fujitsu Hiroshi , Takeshita Kenjiro
Published: July 2006

It was found that propylene was catalytically converted into acetylene and butadiene accompanied with the foramtion of coke at 150°–250° over ion-exchanged zeolites, although the yield and the catalyst life were insufficient. The activity of the ion is found in the order of Ca>Zn>Mn>H>Ni>Ag>Co>Fe>Cu. The catalytic activity may be related with the Lewis acidity.
DISPROPORTIONATION OF XYLENE OVER PARTIALLY METAL EXCHANGED H-MORDENITE
Authors: Yashima Tatsuaki , Iwase Osamu , Hara Nobuyoshi
Published: July 2006

It was found that the shape-selective disproportionation of xylene effectively proceeded over the partially exchanged H-mordenite catalyst by the cations with a suitable ionic radius(ca. 0.07nm), and produced 1,2,4-trimethylbenzene in a high selectivity(84%).
PREPARATION OF CHLOROCARBONYLBIS(TRIPHENYLPHOSPHINE)RHODIUM FROM TRIS(TRIPHENYLPHOSPHINE)CHLORORHODIUM, CARBON DIOXIDE, AND MOLECULAR HYDROGEN
Authors: Koinuma Hideomi , Yoshida Yasuhiko , Hirai Hidefumi
Published: July 2006

Chlorocarbonylbis(triphenylphosphine)rhodium was obtained by the reaction of tris(triphenylphosphine)chlororhodium with carbon dioxide and hydrogen. Use of a polar aprotic solvent was effective for the reaction. This reaction indicates carbon dioxide is reduced by molecular hydrogen on a rhodium complex and fixed in the form of a carbonyl complex.
MICROWAVE SPECTRA OF DIMETHYLETHER IN THE EXCITED TORSIONAL STATES
Authors: Hayashi Michiro , Imachi Misako
Published: July 2006

Microwave spectra of dimethylether and its deuterated species, (CD3)2O, in the excited torsional states were studied in relation to the top–top coupling problem of internal rotation of two methyl groups. A preliminary analysis of the observed splittings of the spectra was carried out in order to evaluate V3, V′ and V″ values in the potential function.
THE LOWEST TRIPLET STATE OF 9,10-ANTHRAQUINONE
Authors: Narisawa Takatoshi , Sano Mizuka , I’haya Yasumasa J
Published: July 2006

The lowest energy absorption peak was found at 22154.0 cm−1 for a thick single crystal of 9,10-anthraquinone at 4.2 K. From the analysis of Zeeman absorption patterns for the intense, sharp peaks observed at 22319.3 and 22357.9 cm−1, the lowest triplet state was assigned to 3B1g.
ANTINEOPLASTIC AGENTS. SYNTHESIS OF SOME 1-SUBSTITUTED 5-FLUOROURACIL DERIVATIVES
Authors: Tada Masao
Published: July 2006

Reactions of 5-fluorouracil with various acyl chlorides, alkanesulfonyl chlorides, and arenesulfonyl chlorides In dioxane or dimethylformamide gave the 1-substituted derivatives. Some of these products showed markedly antitumor activity.
SODIUM ISOTOPIC EXCHANGE RATE BETWEEN CRYSTALLINE ZIRCONIUM PHOSPHATE AND MOLTEN NaNO3
Authors: Inoue Yasushi , Yamada Yoshimune
Published: July 2006

The isotopic exchange rate of sodium ion between crystalline zirconium phosphate and molten NaNO3 has been measured at 312°C and 362°C by batch method. The equilibrium was reached within 20 minutes at either temperature, and the rate was very rapid as compared with that of sodium-potassium ion exchange.
AN EFFICIENT METHOD FOR CYCLOPROPANATION VIA APROTIC DIAZOTIZATION OF 3-(TRI-n-BUTYLSTANNYL)PROPYLAMINES
Authors: Teratake Shuji , Morikawa Shun-ichi
Published: July 2006

Reactions of 2-lithio-3-(tri-n-butylstannyl)propionitrile (1) with alkyl halides or carbonyl compounds gave the corresponding 2-substituted 3-(tri-n-butylstannyl)propionitriles (2), which were reduced to amines (4) and then diazotized to give alkyl cyclopropanes or cyclopropanemethanols, respectively, in moderate overall yields.
HYDROGEN BOND IN THE NH4+-TETRANACTIN COMPLEX
Authors: Nawata Yoshiharu , Sakamaki Toshio , Iitaka Yoichi
Published: July 2006

The molecular structure of the NH4+-tetranactin complex was determined by the X-ray diffraction method. The ammonium H atoms form strong hydrogen bonds to the ether 0 atoms in tetrahedral directions. They also interact electrostatically with the carbonyl 0 atoms. No signs of rotational disorder were detected for the NH4+ ion at 21°C.
THE AMINATION OF FATTY ACIDS USING Cu(II)–AMMINE COMPLEX
Authors: Kamiyama Tsutomu , Inoue Masami , Enomoto Saburo
Published: July 2006

Fatty acids were coupled with ammonia to amino acids in the presence of Cu(II)–ammine complex. In aqueous solution, using ammonium acetate, the yield of glycine reached the maximum value of 15.8% after 3 hr at 140°C. The yield and the distribution of amino acids varied with fatty acids used.
PHOTOCHEMICAL METHYLATION OF INORGANIC MERCURY IN THE PRESENCE OF MERCURIC SULFIDE
Authors: Akagi Hirokatsu , Fujita Yuzaburo , Takabatake Eigo
Published: July 2006

Photosensitized methylation of mercuric acetate in aqueous acetic acid solutions in the presence of mercuric sulfide has been studied. Mercuric sulfide solubilizes rapidly in the dark coupled with the reduction of inorganic mercury, and the resulting sulfur atoms photo-polymerize under irradiation with a blacklight-lamp to give a milky white suspension, photo-sulfur, which acts as an efficient photosensitizer for the production of methylmercury.
“DOUBLE ASYMMETRIC REDUCTION” OF (−)MENTHYL BENZOYLFORMATE USING CATALYTIC HYDROSILYLATION
Authors: Ojima Iwao , Nagai Yoichiro
Published: July 2006

Effective double asymmetric reduction of (−)menthyl benzoylformate was realized using hydrosilylation catalyzed by rhodium(I) complex catalysts. The effect of the (−)menthyl group was estimated.
RING-OPENING REACTION OF PALLADIACYCLOPENTADIENE COMPLEX WITH N,N-DICHLOROAMINE AND -AMIDE
Authors: Suzuki Hiroharu , Itoh Kenji , Matsuda Isamu , Ishii Yoshio
Published: July 2006

Reactions of the palladiacyclopentadiene complex, Pd(C4R4)(bipy) [R=COOCH3], with N,N-dichloroamine and -amide afforded three different σ-4-chloro-1,2,3,4-tetrakis(methoxycarbonyl)buta-1,3-dienylpalladium complex [II], [III], and [IV]. No nitrene adducts were formed.
APPLICATIONS OF ADIABATIC RAPID PASSAGE TO CORRELATION NMR SPECTROSCOPY. II. MEASUREMENT OF SPIN-LATTICE RELAXATION TIMES
Authors: Ozawa Hiroshi , Arata Yoji
Published: July 2006

An adiabatic rapid passage method in correlation NMR spectroscopy has been proposed for measurements of spin-lattice relaxation times, and an illustrative example is given.
CARBONIZATION OF AROMATIC COMPOUNDS IN MOLTEN SALT
Authors: Ota Etsuro , Otani Sugio
Published: July 2006

Aromatic compounds, such as naphthalene, anthracene, and biphenyl, were heated in mixed molten salt(AlCl3:KCl:NaCl=3:1:1 mole) for 10 hours at 300°C, giving carbon in good yields. The carbon was obtained mostly in the form of powder and partly film and plate, and its crystallite thickness after heating at 2800°C ranges from 50Å to 700Å.
THE LIGHT-EMITTER IN BIOLUMINESCENCE OF THE SEA CACTUS CAVERNULARIA OBESA
Authors: Shimomura Osamu , Inoue Shoji , Goto Toshio
Published: July 2006

The structure of the light-emitter extracted from the sea cactus Cavernularia obesa was determined as 2-(p-hydroxyphenylacetamido)-3-benzyl-5-(p-hydroxyphenyl)pyrazine. This result strongly suggests the structure of coelenterate luciferyl sulfate.
PHOTODIMERIZATION OF 3,3-BIPHMYLME-1-BROMO-1-PHENYLALLENE
Authors: Ueda Kozaburo , Toda Fumio
Published: July 2006

Photodimerization of the title allene afforded 1,1-biphenylene-3-bromo-2-bromobenzylidene-4-fluoren-9-ylidene-3-phenylcyclobutane (2), whereas the photodimerization in the presence of fluorenone afforded 1,1,6,6-bis(biphenylene)-4,5-dibromo-3,4-diphenylhexa-1,2,5-triene (9).
A FACILE HYDROLYSIS OF HYDROPHOBIC ESTERS BY CYCLO(d-LEU-l-HIS)
Authors: Imanishi Yukio , Sugihara Toshiharu , Tanihara Masao , Higashimura Toshinobu
Published: July 2006

In the hydrolysis of p-nitrophenyl laurate, cyclo(d-Leu-l-His) was much more effective catalyst than imidazole, the corresponding linear peptide and cyclo(l-Leu-l-His). The importance of binding the ester by the catalyst, and of keeping the isobutyl group of the d-leucyl residue and the imidazole group of the l-histidyl residue into a juxtaposition with the aid of the rigid cyclic backbone was suggested.
A NEW SYNTHESIS OF PHOSPHONIC ACID ESTERS
Authors: Yoshida Zen-ichi , Yoneda Shigeo , Kawase Tokuzo
Published: July 2006

It has been found that treatments of cyclohexanethione with trialkyl phosphites and subsequently with Raney nickel gave cyclohexanephosphonic acid esters in good yield.
A 1,3-DIPOLE IN SULFILIMINE-PHOSPHINE SYSTEM (III) ACID ANHYDRIDE-, ESTER-, AND AMIDE-CONDENSATIONS BY SULFILIMINE-PHOSPHINE SYSTEM
Authors: Aida Tetsuo , Furukawa Naomichi , Oae Shigeru
Published: July 2006

Alkyl phenyl N-p-tosylsulfilimine and triphenylphosphine reacted with various carboxylic acids affording their anhydrides. The reaction was successfully extended to an ester- or amide-condensation reaction. These results can be interpreted by the initial formation of a 1,3-dipole between the sulfilimine and the phosphine.
EMISSION SPECTRA OF CH+ PRODUCED FROM CH4 AND C2H2 BY CONTROLLED ELECTRON IMPACT
Authors: Tsuji Masaharu , Ogawa Teiichiro , Nishimura Yukio , Ishibashi Nobuhiko
Published: July 2006

Under the controlled electron-impact excitation (0–450 eV) of CH4 and C2H2 at low pressures, photoemission was observed from such excited fragments as H, CH, CH+, C2 and C4H2+. The excitation function and the appearance potential of the CH+ emission were measured, and the dissociation process was discussed.
CHEMISTRY OF NITROSOIMINES. IX. ESCA STUDY OF 3-SUBSTITUTED 2-NITROSOIMINO-2,3-DIHYDROBENZOTHIAZOLES: MESOIONIC STRUCTURE
Authors: Akiba Kin-ya , Hisaoka Motoyuki , Inamoto Naoki , Ohta Toshiaki , Kuroda Haruo
Published: July 2006

Core electron binding energies of 3-substituted 2-nitrosoimino-2,3-dihydrobenzothiazoles (1) and related compounds were measured by ESCA to show large contribution of mesoionic structures for 1 and this was also supported by observed chemical shifts (NMR) of 3-methyl groups of benzothiazolines.
cis-DIOXO(ACETYLACETONATO)(1,10-PHENANTHROLINE)VANADIUM(V)
Authors: Isobe Kiyoshi , Ooi Shun’ichiro , Nakamura Yukio , Kawaguchi Shinichi , Kuroya Hisao
Published: July 2006

The reaction of oxobis(acetylacetonato)vanadium(IV) with 1,10-phenanthroline in methylene chloride under aerobic conditions afforded diamagnetic dioxo(acetylacetonato)(1,10-phenanthroline)vanadium(V). The cis configuration of this compound was concluded on the basis of IR and Raman data, and confirmed by the single crystal X-ray analysis. The geometry of this mixed ligand complex is a distorted octahedron. The V-O(oxide anion) distances are 1.613(4) and 1.670(5)Å, the O-V-O angle being 105.5(2)°. The appreciable trans influence of the oxide anion is reflected on the V-N and V-O(acetylacetonate) distances.
THREE ISOMERS OF DINITROOXALATODIAMMINECOBALTATE(III) COMPLEX
Authors: Ito Teiichi , Shibata Muraji
Published: July 2006

Three isomers of the dinitrooxalatodiamminecobaltate(III) complex have been isolated; the cis-cis- and trans(NO2)-isomers have been obtained from the reaction mixture of the cis-cis-[Coox(H2O)2(NH3)2]+ complex and KNO2, the remaining trans(NH3)-isomer from that of the [Co(NO2)4(NH3)2]− complex and oxalic acid.
THE CARBONYLATION OF ACETYLENIC COMPOUNDS CATALYZED BY PALLADIUM-BLACK
Authors: Mori Kunio , Mizoroki Tsutomu , Ozaki Atsumu
Published: July 2006

Palladium-black is a highly active catalyst in the presence of hydrogen iodide in methanol for α-monocarbonylation of phenylacetylene, methylacetylene, and acetylene to give methyl atropate, methyl methacrylate, and methyl acrylate respectively. Triphenylphosphine or triphenylarsine added to the reaction mixture increases the selectivity to β-carbonylated products.
CONFORMATIONAL ISOMERS OF 4H-CHROMENE CONFORMATION OF 4H-PYRAN
Authors: Kawato Toshio , Murase Ichiro
Published: July 2006

By the condensation of salicylaldehyde and acetylacetone, isomeric 3-acetyl-4-diacetylmethyl-2-methyl-4H-chromenes were prepared. From the fact that a pair of conformational isomers of these compounds exists, a boat structure of 4H-pyran was proposed.
ELECTRONIC SWITCHING IN PYRANTHRONE THIN FILM
Authors: Sakai Yoshiro , Sadaoka Yoshihiko
Published: July 2006

Bistable field- and thermal-induced switching between a “ON” state and a “OFF” state was observed in pyranthrone thin film by using surface type cell with gold electrodes. The transformation from the “OFF” state to the “ON” state is caused by the avalanche of electrons at the negative biased electrode.
HIGHLY EFFICIENT CHROMATOGRAPHIC RESOLUTION OF [Co(en)3]3+ ION WITH A COLUMN OF TA(ES)-SEPHADEX CONTAINING d-TARTRATE GROUPS
Authors: Fujita Miho , Yoshikawa Yuzo , Yamatera Hideo
Published: July 2006

Sephadex cation exchanger with d-tartrate groups was newly prepared. This cation exchanger was applied to column chromatographic resolution of [Co(en)3]3+ and complete resolution was accomplished with high efficiency using an aqueous solution of sodium l-tartrate as the eluent.
DIELECTRIC BEHAVIOR OF 2-METHYL-2-PROPANOL IN BENZENE AND PYRIDINE SOLUTIONS. II
Authors: Sato Hiroshi , Koshii Taro , Takahashi Hiroaki , Higasi Keniti
Published: July 2006

Dielectric measurements have been made for 2-methyl-2-propanol in benzene and pyridine solutions at four temperatures. The activation enthalpy and entropy of the principal relaxation of the alcohol decrease upon the addition of these solvents. The mechanism of the principal relaxations of alcohols is discussed from the viewpoint of cluster formation by hydrogen bonds.
A STUDY ON ACETYLATION OF NUCLEOTIDES BY MEANS OF ACETIC ANHYDRIDE IN PYRIDINE
Authors: Kurihara Takashi , Hata Tsujiaki
Published: July 2006

A side-reaction in the course of acetylation of nucleotides has been studied.
PHOTOELECTRON SPECTRUM OF MALONALDEHYDE
Authors: Nishijima Chiho , Nakayama Hiroaki , Kobayashi Tsunetoshi , Yokota Katsuyuki
Published: July 2006

The photoelectron spectrum (PES) of malonaldehyde was measured and assigned in comparison with those of acetylacetone, trifluoroacetylacetone, and hexafluoroacetylacetone. The first and the second bands of malonaldehyde were attributed to the ionizations from the b2π and the b1n orbitals, respectively, on the basis of the methyl and trifluoromethyl substituent effects and the PES result of acetylacetone.
OLIGONUCLEOTIDE STUDIES. XI. DETERMINATION OF BASIC IONIZATION CONSTANTS OF GUANYLYL-3′,5′-GUANOSINE
Authors: Ogasawara Naotake , Inoue Yasuo
Published: July 2006

From circular dichroic data, by utilyzing the method developed by Ang for determining the overlapping pK values, basic ionization constants have been evaluated for guanylyl-3′,5′-guanosine. This work establishes the first instance of the determination of the apparent ionization constants for the two protonation steps involved in homodinucleotides. A change of the circular dichroism with pH is convincing evidence for the existence of intermediate stacked monoprotonated species.
13C NMR SPECTRA OF ALKENYLBORANES. EVIDENCE FOR THE PRESENCE OF π-CHARACTER IN THE B–C BOND
Authors: Yamamoto Yoshinori , Moritani Ichiro
Published: July 2006

The strong deshieldlng of the β-carbon atom in the 13C NMR spectra of α,β-unsaturated alkenylboranes supports the presence of π-character in the B–C bond.
NON-STEADY STATE STUDY ON THE BASE HYDROLYSIS OF MONOIODOPENTAAMMINERUTHENIUM(III) COMPLEX
Authors: Sakamoto Hiroyuki , Makino Haruo , Hamada Keijiro , Ohyoshi Akira
Published: July 2006

A new mechanism on the base hydrolysis of monoiodopentaammineruthenium(III) complex has been proposed by means of analysis of the non-steady state reaction. The reaction is well accounted by a mechanism involving SN2 CB and SN2 processes:

[RuI(NH3)5]2++OH−\ightleftarrows[RuI(NH3)4(NH2)]++H2O

[RuI(NH3)4(NH2)]++OH−→[Ru(OH)(NH3)5]2++I−+OH−

[RuI(NH3)5]2++OH−→[Ru(OH)(NH3)5]2++I−
FACILE FORMATION OF TRICYCLO[4.4.1.03,8]UNDECANE RING SYSTEM FROM 2,4-DEHYDROHOMOADAMANTANE
Authors: Yamaguchi Ryohei , Kawanisi Mituyosi
Published: July 2006

Treatment of 2,4-dehydrohomoadamantane (1) with excess iodine or bromine and silver acetate in acetic acid afforded exo, exo-4, 9-diacetoxytricyclo[4.4.1.03,8]undecane (3) and endo, exo-4, 9-diacetoxytricyclo(4.4.1.03,8)undecane (4) as major reaction products.
STRUCTURE AND REACTIVITY OF ORGANIC IONS IN GAS-PHASE RADIOLYSIS. IX. PROTON EXCHANGE REACTION IN METHANE-BENZENE MIXTURE
Authors: Yamamoto Yukio , Takamuku Setsuo , Sakurai Hiroshi
Published: July 2006

In the gas-phase radiolysis of a CH4(100 mm)–C6H6(5 mm)–C6D6(5 mm) mixture, an H-D exchange was observed in reactant benzene; the G value of the H-D exchanged benzenes was 69. The result has been attributed to the proton exchange reaction of the C6H7+ ion with reactant benzene.
REACTIONS OF DIMETHYLMETHYLTHIOSULFONIUM FLUOROBORATE WITH SOME NUCLEOPHILES
Authors: Minato Hiroshi , Miura Takashi , Kobayashi Michio
Published: July 2006

Reactions of dimethylmethylthiosulfonium fluoroborate with phenyl phosphite, pyridine, 4-cyanopyridine, N,N-dimethylaniline, p-nitro-N,N-dimethylaniline, thiophenol or sodium thiophenolate are almost instantaneous at room temperature, while the reactions with phenols and anisole proceed slowly at 60°C. Products are determined, and the mechanisms are discussed.
A CONVENIENT METHOD FOR THE PREPARATION OF gem-DICHLOROCYCLOPROPANE DERIVATIVES BY THE USE OF TiCl4 AND LiAlH4
Authors: Mukaiyama Teruaki , Shiono Manzo , Watanabe Kenzo , Onaka Makoto
Published: July 2006

gem-Dichlorocyclopropane derivatives are obtained in good yields by the application of low valent titanium chloride, prepared from TiCl4 and LiAlH4, to carbon tstrachloride in the presence of olefins.
PARTIAL MOLAL VOLUMES AND ADIABATIC COMPRESSIBILITIES OF DODECYLHEXAOXYETHYLENE GLYCOL MONOETHER IN AQUEOUS SOLUTIONS
Authors: Harada Shigeharu , Nakajima Toshio , Komatsu Tsuyoshi , Nakagawa Tsurutaro
Published: July 2006

The partial molal volume ( \barV2 ) and adiabatic compressibility ( \barK2 ) of dodecylhexaoxyethylene glycol monoether have constant values in the micellar solution. The values of \barV2° and \barK2° ( at infinite dilution ) of the single molecule could not be determined experimentally because of its low CMC. Their values were calculated from the corresponding values of CH3, CH2, CH2CH2O, and CH2OH groups. The changes in \barV2 and \barK2 associated with micelle formation are 10.5 ml/mo1 and 287×10−4 ml/mol·bar at 5°C, and 10.7 ml/mol and 208×10−4 ml/mol·bar at 25°C, respectively.
NEW CROSS ALDOL REACTIONS. THE REACTIONS OF SILYL ENOL ETHERS WITH KETO ESTERS PROMOTED BY TITANIUM TETRACHLORIDE
Authors: Banno Kazuo , Mukaiyama Teruaki
Published: July 2006

It was found that, in the presence of TiCl4, keto esters such as ethyl pyruvate, ethyl 2,2-dimethyl acetoacetate, ethyl levulinate and ethyl 5-oxohexanoate react with various trimethylsilyl enol ethers derived from ketones at room temperature to afford cross aldols, i.e., hydroxy keto esters, in good yields.
CATALYTIC DEHYDROCHLORINATION OF 1,1,2-TRICHLOROETHANE INTO 1,1-DICHLOROETHYLENE OVER ALUMINA PROMOTED BY WATER
Authors: Mochida Isao , Uchino Atsuko , Fujitsu Hiroshi , Takeshita Kenjiro
Published: July 2006

It was found by the pulse technique that 1,1,2-trichloroethane was selectively dehydrochlorinated into 1,1-dichloroethylene at 200° over alumina promoted by water before the reaction. Further it was also found that the activity of alumina was retained constant after an initial decrease by first two pulses.
THE STRUCTURAL ELUCIDATION AND THE BIOSYNTHETIC STUDY OF CLEOMEPRENOLS-9, -10, AND -11 FROM THE LEAVES OF CLEOME SPINOSA
Authors: Suga Takayuki , Shishibori Tsuyoshi , Kosela Soleh , Tanaka Yoshiro , Itoh Masumi
Published: July 2006

A homologous series of polyprenols isolated from Cleome spinosa L. of Capparidaceae were established to be nonaprenol (C45), decaprenol (C50), and undecaprenol (C55) composed of an ω-terminal isoprene residues, three internal trans-isoprene residues, and the remaining cis-isoprene residues, respectively. The prenols were demonstrated to be synthesized biologically by successive cis-additions of isoprene residues to all-trans-geranylgeranyl pyrophosphate.
CATALYTIC REDUCTION OF NITRIC OXIDE WITH AMMONIA OVER TRANSITION METAL ION-EXCHANGED Y ZEOLITES
Authors: Seiyama Tetsuro , Arakawa Tsuyoshi , Matsuda Toshio , Yamazoe Noboru , Takita Yusaku
Published: July 2006

Catalytic reduction of nitric oxide with ammonia was studied over transition metal ion-exchanged Y zeolite (Me-Y) catalysts. Among various catalysts used, Cu(II)–Y was found to be of particular interest, exhibiting low temperature activity and an unusual catalytic activity-temperature profile with a maximum at 120°C. It was also observed that the catalytic activity was enhanced considerably when a second cation, especially Co (II) or Fe(III), was co-exchanged together with Cu(II) in Y zeolite. Such phenomena were discussed briefly.
SYNTHESIS OF N-LAUROYLVALINE DERIVATIVES
Authors: Ogura Katsuyuki , Yoshimura Ikuo , Katoh Nobuko , Tsuchihashi Gen-ichi
Published: July 2006

Methyl ester of N-lauroylvaline, as well as its α-methylthio and α-methoxy derivatives, was synthesized, starting from 1-methylsulfinyl-1-methylthio-2-amino-3-methyl-1-butene (2, R1 = i-Pr) which was obtained by the reaction of isobutyronitrile and methyl methylthiomethyl sulfoxide (1).
DINAPHTHO[2,1-h 1′,2′-n]-5,18-DI-t-BUTYL-1,3,10,12-TETRADEHYDRO[l8]ANNULENE AND RELATED COMPOUNDS. THE EFFECT OF POSITION OF ANNELATION ON THE DIATROPICITY OF ANNULENE RING
Authors: Iyoda Masahiko , Nakagawa Masazumi
Published: July 2006

Dinaphtho-di-t-butyltetradehydro[18]annulene (X) was prepared in order to clarify the effect of annelation on the diatropicity of dehydroannulenes containing formal acetylene and cumulene in the cyclic system. It was found that the diatropicity of X is strongly suppressed by fusion with two naphthalene nuclei in contrast to strongly diatropic dinaphtho-di-t-butyldidehydro[l4]annulene (III). The result indicates that equivalent Kekule structures exert prominent effect on the delocalization of π-electrons in annelated annulene. The preparation of bis(dihydronaphtho)- (VIII) and naphtho-dihydronaphtho- (XII) analogues as reference compounds was also described.
THE RATES OF THE REVERSIBLE ELECTRON-TRANSFER REACTION BETWEEN 7,7,8,8-TETRACYANOQUINODIMETHANE ANION RADICAL AND 2,3-DICHLORO-5,6-DICYANO-P-BENZOQUINONE IN ACETONITRILE
Authors: Yamagishi Akihiko
Published: July 2006

The rates of the electron-transfer reaction between 7,7,8,8-tetracyanoquinodimethane anion radical and 2,3-dichloro-5,6-dicyano-p-benzoquinone in acetonitrile have been determined with a temperature-jump apparatus. The forward and backward rate constants are (4±1) ×109M−1s−1 and (1±0.5) ×104M−1s−1 at 15°C, respectively. Addition of 10 per cent water to acetonitrile decreases the forward rate constant by a factor of 100.
SPIN TRAPPING OF THE SHORT-LIVED RADICALS FORMED IN γ-IRRADIATED AQUEOUS SOLUTIONS OF DIPEPTIDES AND NUCLEIC BASES
Authors: Taniguchi Hitoshi , Hatano Hiroyuki
Published: July 2006

Short-lived radicals of dipeptides and nucleic bases and additional hydrogen atom formed in γ-irradiated aqueous solutions are trapped with 2-methyl-2-nitrosopropane and structures of these radicals are identified. The line width of spin adduct radical with higher molecular weight possibly gives information about the local dynamic structure around the radical center.
ELECTRONIC SPECTRA OF AMORPHOUS ORGANIC FILMS
Authors: Maruyama Yusei , Machida Kyoko , Iwasaki Noriko , Iwashima Satoshi
Published: July 2006

An annealing effect in the absorption spectrum of an amorphous naphthacene film was investigated. The remarkable effect observed may be explained by assuming the change of the range of order in molecular arrangements. The fluorescence life times of some amorphous organic films were also measured comparing with those of crystalline films. The differences between them were discussed in terms of the localization character of electronic states in the amorphous film.
REACTION PROCESS BETWEEN SODIUM TUNGSTATE AND CHLORINE
Authors: Saeki Yuzo , Kato Akemi , Matsuzaki Ryoko
Published: July 2006

The reaction process between Na2WO4 and chlorine can be represented as follows: Na2WO4 \xrightarrowabout140°C Na2W2O7 \xrightarrowabout350°C Na2W4O13 \xrightarrowabout480°CWO3. The WO3 The reacts with chlorine above about 700°C to form volatile WO2Cl2. WOCl4 obtained together with WO2Cl2 above 800°C is probably formed by the reaction between WO3 and NaCl.
MICHAEL ADDITION OF α-PHENYLSULFINYL-Δα,β-BUTENOLIDE
Authors: Iwai Kiyoshi , Kosugi Hiroshi , Uda Hisashi
Published: July 2006

α-Phenylsulfinyl-Δα,β-butenolide reacts more effectively with the enolates of cyclopentanone, 2-ethoxycarbonylcyclohexanone, and ethyl n-valerate than the phenylthio analog to give the Michael addition products, which, except the cyclopentanone derivative, are transformed into the corresponding β-substituted Δα,β-butenolides.