bluuebunny/crossref_metadata_2025 huggingface dataset:
3d-Element Coordination Compounds with Bidentate Sulfur-Containing Ligands as Possible Carriers of Non-Silver Photographic Images
Authors: Mikhailov O V , Budnikov G K
Published: July 2006

Complexing processes occurring between reactive matrices obtained from Fe(III), Co(III), Ni(II), Cu(II) hexacyanoferrates(II), and alkaline solutions of various nitrogen-sulfur-containing chelating ligands in thin gelatin layers have been studied. With Fe(III) and Cu(II) hexacyanoferrates, complexing process is found out to proceed according to SN1 mechanism, while in Co(III) and Ni(II) hexacyanoferrates matrices, SN2 mechanism is realized. The schemes of the processes proceeding in each of the above matrices are given. The examples of the kinetic curves for particular systems “hexacyanoferrate(II)-ligand” as well as spectral characteristics of thin gelatin layers containing chelate complexes formed as a result of the chelating process are presented. The possibility of practical utilization of complexing processes studied for obtaining non-silver photographic images from light-resistant metallorganic dyes is reported.
The Molecular Structure of the Heterodinuclear Organometallic Complex of Platinum and Tungsten, Phenyl(1,5-cyclooctadiene)platinum–tricarbonyl(η5-cyclopentadienyl)tungsten
Authors: Miki Kunio , Kasai Nobutami , Endo Isao , Komiya Sanshiro
Published: July 2006

The structure of the novel heterodinuclear organometallic complex, [(cod)(Ph)Pt–W(CO)3(η5-C5H5)] has been determined by X-ray crystallography; the Pt–W bond distance is 2.844(1)Å.
A Mild Selective Monobromination Reagent System for Alkoxybenzenes; N-Bromosuccinimide–Silica Gel
Authors: Konishi Hisatoshi , Aritomi Katsutomo , Okano Tamon , Kiji Jitsuo
Published: July 2006

The monobromination of alkoxybenzenes with N-bromosuccinimide catalyzed by silica gel in carbon tetrachloride occurred preferentially at the para-position. m-t-Butylmethoxybenzene yielded 4-bromo-3-t-butyl-1-methoxybenzene with a selectivity of 74% even in the presence of a bulky substituent at the meta-position.
Acid-Catalyzed Oxidation of Oxiranes with Dimethyl Sulfoxide Giving α-Hydroxy Ketones
Authors: Tsuji Tadakazu
Published: July 2006

The reaction of various oxiranes with dimethyl sulfoxide in the presence of Molecular Sieve 4A and acid afforded the corresponding α-hydroxy ketones. The molecular sieve was found to accelerate the reaction.
Formulation and Enumeration of Five-Center Organic Reactions
Authors: Fujita Shinsaku
Published: July 2006

Five-center organic reactions are formulated in the form of pentagonal reaction-center graphs (RCC’s) that are subgraphs of imaginary transition structures. This formulation is based on the concept of a charge space that affords rational representations of coordinate bonds. Pólya’s theorem is applied to the enumeration of these RCG’s, in which the obligatory minimum valencies of vertices restrict the mode of substitution.
AN IMPROVED CNDO APPROACH TO THE 1H CHEMICAL SHIFTS OF OLEFINIC COMPOUNDS
Authors: Kajimoto Okitsugu , Fueno Takayuki
Published: July 2006

A theoretical expression has been derived for the magnetic shielding constant of aliphatic hydrogens, without using the customary point dipole approximation. The expression, combined with CNDO/2 electron densities, has correctly reproduced the 1H chemical shifts observed for various substituted ethylenes and butadienes. It is concluded that the diamagnetic shielding from the neighboring carbon constitutes an important contribution to the shifts.
CORRELATION OF 13C–H AND 13C–C–H COUPLING CONSTANTS OF THE FORMYL GROUP IN SUBSTITUTED BENZALDEHYDES WITH HAMMETT σ CONSTANTS
Authors: Inamoto Naoki , Masuda Shozo , Terui Atsuko , Tori Kazuo
Published: July 2006

The values of 13C–H and 13C–C–H coupling constants of the formyl group in substituted benzaldehydes followed the Hammett equation. The ρ(JC–H) value was found to be considerably larger than that for substituted toluenes. Values for ρo (JC–H) and ρo(JC–C–H) are also discussed.
SPIN TRAPPING BY USE OF NITROSO COMPOUNDS. III. PHENOXAZlNE-N-OXYL PRODUCED FROM THE PHENOXY RADICAL BY SPIN TRAPPING
Authors: Terabe Shigeru , Kuruma Kazuo , Konaka Ryusei
Published: July 2006

Phenoxazine-N-oxyl was produced from the phenoxy radical in the ESR spin trapping technique using nitrosobenzene, and the mechanism of formation was deduced from the results of trapping using deuterated compounds and by product analysis.
INTRAMOLECULAR FORMATION OF YLIDES FROM CARBENES BEARING SULFUR ATOM ON γ-POSITION
Authors: Kondo Kiyosi , Ojima Iwao
Published: July 2006

The thermal decomposition of a sodium salt of 4-phenylthio-4-methyl-2-pentanone tosylhydrazone in diglyme at 150–160°C afforded a mixture of 1,2,2-trimethylcyclopropyl phenyl sulfide (17%), 2,2,3a-trimethyl-1,2,3,3a-tetrahydro-1-thiaazulene (9%), and isomeric 4-phenylthio-4-methylpentenes (74%). Analogous mixtures in varying amounts were obtained from tosylhydrazones derived from 4-phenylthio-2-butanone, 3-phenylthiobutyrophenone, and 3-phenylthio-3-methylbutyrophenone.
FARFUGIN A AND B, NEW SESQUITEEPENES FROM FARFUGIUM JAPONICUM
Authors: Nagano Hajime , Moriyama Yoshihiko , Tanahashi Yoshiaki , Takahashi Takeyoshi , Fukuyama Masaru , Sato Kenichi
Published: July 2006

Two new sesquiterpenes, farfugin A and B, isolated from Farfugium japonicum, have been shown to be a tetrahydronaphthofuran derivative (I) and a benzofuran derivative (II), respectively.
STRUCTURES OF SECO-IRIDOIDS FROM LIGSTRUM OBTUSIFOLIUM SIEB. ET ZUCC.
Authors: Asaka Yukihiro , Kamikawa Tadao , Kubota Takashi , Sakamoto Harunari
Published: July 2006

From spectroscopic evidence, the two seco-iridoids ligstro-side and 10-hydroxyligstroside, isolated from Ligstrum obtusifolium Sieb. et Zucc., are assigned the structures (I) and (V), respectively.
MECHANISM OF CHARGE-TRANSFER POLYMERIZATION: DETECTION OF ION-RADICAL INTERMEDIATES IN THE PHOTOSENSITIZED REACTION OF N-VINYLCARBAZOLE IN THE PRESENCE OF p-CHLORANIL
Authors: Shirota Yasuhiko , Kawai Kiyoshi , Yamamoto Naoto , Tada Kazuhiro , Mikawa Hiroshi , Tsubomura Hiroshi
Published: July 2006

Formation of transient ion-radicals in the photosensitized reaction of N-vinylcarbazole with p-chloranil as an acceptor has been demonstrated for the first time by means of flash spectroscopy.
THE PHOTOCHEMICAL AND THERMAL REACTIONS OF DIETHYL PHENYLAZOPHOSPHONATE WITH CYCLOHEXENE
Authors: Nagao Yoshihiro , Shima Kensuke , Sakurai Hiroshi
Published: July 2006

The photochemical and thermal reactions of diethyl phenylazophosphonate with cyclohexene afforded two 1:1 adducts. In the photochemical reaction, there was the wavelength dependence for the formation of the adducts. It was proposed that the active species for the formation of the adducts were different between the thermal and photochemical reactions.
DECOMPOSITION OF DITHIOCARBAMATES. III. ETHYLDITHIOCARBAMIC ACID IN CONCENTRATED SULFURIC ACID SOLUTIONS
Authors: Takami Fumitaka , Wakahara Shigeru , Maeda Takashi
Published: July 2006

The UV spectral changes and decomposition rates of ethyldithio-carbamic acid (I) were investigated in sulfuric acid solutions. The presence of the S-protonated form (IV) was established. The observed first-order rate constants fit with the rate expression, kobs = kK/(h0 + K), derivable from the proposed mechanism, IV\oversetK⇔I \oversetk→ EtNH2 + CS2.
SYNTHESES OF COPPER(I) TRIPHENYLPHOSPHINE COMPLEXES
Authors: Shono Toshiyuki , Fujii Yoshihiko , Shinra Koichiro
Published: July 2006

Bis(triphenylphosphine)acetylacetonato copper(I) and analogous seven copper(I)triphenylphosphine chelates were prepared from various cupric complexes by reducing directly with triphenylphosphine.
A NEW TKEMETHYLENECYCLOBUTMONE
Authors: Toda Fumio , Kataoka Toshiaki
Published: July 2006

2,3-Bis(diphenylmethylene)-4-benzylidenecyclobatanone (VII) was prepared and its spectral data were compared with those of 2,4- (IX) and 3,4 bis(diphenylmethylene) cyclobutanedione (X).
POLAR EFFECTS ON THE CLEAVAGE REACTION OF SILICON-SILICON BONDS OF 1,2-DIARYLTETRAMETHYLDISILANE WITH 1,2-DIBROMOETHANE. STRUCTURE AND REACTIVITY IN SH2 REACTION
Authors: Hosomi Akira , Sakurai Hideki
Published: July 2006

Symmetrically substituted 1,2-diphenyltetramethyldisilane and hexamethyldisilane (the reference substrate) were reacted competitively with 1,2-dibromoethane in the presence of dibenzoyl peroxide at 30.0° with ultraviolet irradiation. The relative rates of bimolecular homolytic substitution increased with increasing electron-releasing power of the substituents, and a ρσ+ relationship was established with ρ=−1.55.
THE β-CIS ISOMER OF ETHYLENEDIAMINE-N,N′-DIACETATO(DIAMMINE)COBALT(III) AND SOME RELATED COMPLEXES
Authors: Kuroda Kashiro
Published: July 2006

The β-cis isomer of ethylenediamine-N,N′-diacetato(diammine)cobalt(III) perchlorate, β-cis-[Co(EDDA)(NH3)2] ClO4·H2O, and the corresponding ethylenediamine complex have been prepared by the reaction between [Co(EDDA)(H2O)2]ClO4 and ammonia or ethylenediamine at 100°C. The β-cis configuration of the isomers has been identified by the electronic absorption spectra and PMR spectra.
THE PREPARATION AND THE ABSORPTION SPECTRUM OF THE cis-DICYANODICARBONATOCOBALTATE(III) COMPLEX
Authors: Fujinami Shuhei , Shibata Muraji
Published: July 2006

The dicyanodicarbonatocobaltate(III) anion has been isolated by the reaction of tricarbonatocobaltate(III) and cyanide as the tris(ethylenediamine)cobalt(III) salt. The geometrical structure of the complex has been determined as cis-form by comparing the absorption spectrum with that of the known related complex. The spectrum showed marked splitting of the first absorption band.
LASER PHOTOLYSIS STUDIES ON THE IONIZATION OF N-VINYLCARBAZOLE IN THE PRESENCE AND IN THE ABSENCE OF ELECTRON ACCEPTORS
Authors: Taniguchi Yoshio , Nishina Yasuzo , Mataga Noboru
Published: July 2006

Formation of solvated ion radicals in the N-vinylcabazole (VCZ)-electorn acceptor system has been studied by means of the laser photolysis and transient photoconductivity as well as transient absorption measurments. Ion radical formation due to the encounter collision between an excited VCZ and electron acceptor has been established.
Molecular Structure of Quadricyclane (Tetracyclo[3.2.0.02,7.04,6] heptane) Studied by Gas Electron Diffraction
Authors: Mizuno Kazumi , Fukuyama Tsutomu , Kuchitsu Kozo
Published: July 2006

The average C–C and C–H bond distances (rg) and the C2–C3–C4 angle in quadricyclane were determined by gas electron diffraction to be 1.529±0.003 Å, 1.103±0.009Å and 98.5±2°, respectively. The molecule was found to have C2v symmetry in equilibrium. A number of nonbonded distances were also determined: C1–C4=2.43 Å, C1–C3=2.50 Å and C1–C6=2.18 Å. This structure is compared with those of norbornane and bicyclo[2.1.0]pentane reported in recent publications.
SELECTIVE CARBON–CARBON BOND FORMING REACTION BY THE USE OF ALLYL 2-PYRIDYL SULFIDE DERIVATIVES—TOTAL SYNTHESIS OF α-cis-BERGAMOTENE
Authors: Narasaka Koichi , Hayashi Masatoshi , Mukaiyama Teruaki
Published: July 2006

A convenient method for the selective formation of α-coupled allylic compounds was established by the alkylation of lithium salt of allylic 2-pyridyl sulfide with organic halide and the successive reductive desulfurization of the α-alkylated allylic sulfide with CuCl2 and LiAlH4. The method was successfully applied to the total synthesis of α-cis-bergamotene.
SYNTHESIS OF ISOAMYLENE FROM METATHESIS OF ISOBUTENE WITH CIS-2-BUTENE
Authors: Nakamura Ryuichi , Iida Hiroshi , Echigoya Etsuro
Published: July 2006

Metathesis of isobutene with cis-2-butene was studied over MoO3–Al2O3 and Re2O7–Al2O3 catalysts using a flow reactor. Effects of alkali addition to MoO3–Al2O3 and of reaction temperature on the reaction results were investigated. With Re2O7–Al2O3, a satisfactory yield of isoamylene was obtained with a high degree of selectivity.
DEHYDRATION AND ALKYLATION REACTIONS BY THE USE OF PERCHLORATE SALTS
Authors: Mukaiyama Teruaki , Kuwahara Mikio , Izawa Toshio , Ueki Masaaki
Published: July 2006

By the treatment of secondary and tertiary benzylic alcohols or tertiary aliphatic alcohols with AgClO4, in benzene at refluxing temperature for 20 to 420 min, olefins were obtained as dehydrated products in good yields. Further, a new procedure for generating tin perchlorate was devised, and the application of this reagent to alkylation reactions of aromatic compounds from alcohols or paraformaldehyde was investigated.
MICROWAVE SPECTRUM AND STRUCTURE OF VANADYL(V) CHLORIDE
Authors: Karakida Ken-ichi , Kuchitsu Kozo , Matsumura Chi
Published: July 2006

The microwave spectrum of vanadyl(V) chloride was measured, and the following rotational constants (in MHz) were determined: Bo =1741.72±0.01 for OV35Cl3, Bo =1665.20±0.02 for OV37 Cl3, Ao =1739.94±0.05, Bo =1692.17±0.05, Co =1139±1 for OV35Cl237Cl. From these constants the ro structure was determined: r(V–O)=1.595±0.005 Å, r(V–Cl)=2.131±0.001 Å and ∠(Cl–V–Cl)=111.8±0.2°.
THE STRUCTURE OF C20H18O3, A PRODUCT OF THE REACTION OF ACETOPHENONE WITH FORMALDEHYDE IN ACIDIC MEDIA
Authors: Terada Akira , Toyoshima Yoshimasa , Yamaji Tadasu , Sekine Kiyoharu
Published: July 2006

The chemical structure of C20H18O3 (I) which is a crystalline product obtained from the acidic condensation of acetophenone with formaldehyde has been established as 1-benzoyl-4-methylene-5-phenyl-6,8-dioxacyclo[3,2,1]octane. This compound is identical with the product, C20H18O3, isolated by Beets and Heeringa from the Prins reaction of phenylacetylene. The formation mechanism has also been proposed.
A NEW SYNTHESIS AND ENE REACTION OF 1,2-DIPHENYLCYCLOPROPENE
Authors: Yoshida Zen-ichi , Miyahara Hideki
Published: July 2006

A new worthwhile synthesis of 1,2-diphenylcyclopropene (1) by the dehydrochlorination of cis- and trans-1-chloro-1,2-diphenylcyclopropanes has been found. The isolation of two dimers and ene reactions of 1 have also been described.
OXYGEN ATOM REACTIONS WITH METALLOCENES
Authors: Koda Seiichiro , Hikita Tsutomu
Published: July 2006

We investigated the products of atomic oxygen reaction with ferrocene and nickelocene, comparing them with those of oxygen atom reaction with 1,3-cyclopentadiene. In the case of cyclopentadiene, important products were C4H6 isomers and in the case of metallocenes, vinylacetylene.
THE PHOTOCHEMICAL (4 + 4) CYCLOADDITIOM OF FURAN TO α-NAPHTHONITRILE
Authors: Pac Chyongjin , Sugioka Taizo , Sakurai Hiroshi
Published: July 2006

The photochemical reaction of α-naphthonitrile with furan affords a (4 + 4) cycloadduct, 1-cyano-9,10-benzo-11-oxatricyclo [4,2,2,12,5] undeca-3,7,9-triene (I), in a good yield, and an exciplex intermediacy is suggested on kinetic and spectroscopic grounds.
ESR Study of Hot Ions: Pb(III) in γ-Irradiated Lead Tetraacetate
Authors: Isoya Jun-Ichi , Ishizuka Hidehiro , Yamasaki Akira , Fujiwara Shizuo
Published: July 2006

An unstable paramagnetic Pb(III) hot ion was identified in γ-irradiated polycrystalline lead tetraacetate by ESR hyperfine spectrum of 207Pb isotope. ESR parameters are as follows: (gx, gy, gz)=(2.0063, 2.0077, 2.0035). (Ax/gxβ, Ay/gyβ, Az/gzβ)=(12819, 12827, 12854 (gauss)).
THE PREPARATION OF SOME TROPONE COMPLEXES
Authors: Asao Toyonobu , Ninomiya) Yoriko Kikuchi (née
Published: July 2006

Tropone and its various derivatives were found to form several complexes having a composition of 1 : 1, 1 : 2, or 2 : 1 with mercury (II), zinc (II), cadmium (II), copper (II), cobalt (II), manganese (II), and nickel (II). In all cases, co-ordination would occur with the carbonyl oxygen.
THE THERMALLY INDUCED INTRAMOLECULAR CYCLIZATION OF THE TETRACYCLO (3.3.2.02,4.06,8]DEC-9-ENE SYSTEM
Authors: Toda Takashi , Tanigawa Chie-ko , Yamae Akira , Mukai Toshio
Published: July 2006

Dimethyl tetracyclo[3.3.2.02,4.06,8]dec-9-ene-2,4-dicarboxylate has been synthesized from cycloheptatriene in three steps, and its thermal and photochemical behaviors have been investigated, It was inert to light, but gave a pentacyclic compound on heating. In the same way, dimethyl tricyclo(3.2.1.02,4)oct-6-ene-2,4-dicarboxylate afforded an analogous tetracyclic compound.
ASYMMETRIC HYDROFORMYLATION OF STYRENE BY OPTICALLY ACTIVE PHOSPHINE–RHODIUM COMPLEX CATALYST
Authors: Ogata Ikuei , Ikeda Yoshikazu
Published: July 2006

Styrene was hydroformylated by a rhodium catalyst in the presence of excess (+)-benzylmethylphenylphosphine (10 moles per 1 atom Rh) at 120°C under 100 atm(initial) of synthesis gas (CO/H2=1) to give an optically active product ([α]D25 +38.5° , content of hydratropaaldehyde 90%).
FORMATION OF A DIMER IN THE REACTION OF l-HISTIDYLGLYCINE OR l-HISTIDYLGLYCYLGLYCINE WITH COPPER(II) IN AQUEOUS SOLUTION
Authors: Yokoyama Akira , Aiba Hiroji , Tanaka Hisashi
Published: July 2006

In complex formation of l-histidylglycine or l-histidylglycylglycme with copper(ll), formation of dimer through deprotonation of peptide amide group was indicated in neutral region, by electronic spectra and pH titration. Possible structure is proposed, in which imidazole-nitrogen coordinates to one copper(II) and other coordination sites bind to another copper(II).
THE BIOSYNTHESIS OF A NON-HEAD TO TAIL MONOTERPENE, ARTEMISIA KETONE
Authors: Suga Takayuki , Shishibori Tsuyoshi , Kotera Kazuo , Fujii Ritsuko
Published: July 2006

Artemisia ketone (1) biosynthesized from [2-14C]mevalonic acid by Artemisia annua L. was found to contain 80% and 13% of the incorporated tracer in the internal and terminal methyls respectively. The unbalance of labelling means that the C5-precursors of two halves of (1) are enzymatically differentiated.
A CONVENIENT SYNTHESIS OF 4-DIMETHYLSULFURANYLIDENE-2,3-DIOXOTETRAHYDROFURAN DERIVATIVES; THE REACTIONS OF ETHYL (DIMETHYLSULFURANYLIDENE) PYRUVATE WITH CARBONYL COMPOUNDS
Authors: Hagio Katsuaki , Takei Hisashi , Mukaiyama Teruaki
Published: July 2006

The cyclic ylides, 4-dimethylsulfuranylidene-2,3-dioxotetrahydrofuran derivatives, were synthesized by the reactions of ethyl (dimethylsulfuranylidene)pyruvate with carbonyl compounds in good yields. The structures of new sulfonium ylides were comfirmed by the spectral data and the elemental analyses.
THE PHOTOCHEMICAL REACTION OF HYDROGEN CYANIDE IN GAS PHASE AT 184.9 nm
Authors: Mizutani Hiroshi , Mikuni Hitoshi , Takahasi Makoto
Published: July 2006

The photochemistry of hydrogen cyanide at 184.9 nm was studied. Major reaction products are cyanogen and hydrogen, and minors are methane, ammonia, ethane, hydrazine and methylamine. The addition of hydrogen atoms to hydrogen cyanide is considered for the formation of these products. A reddish brown polymeric substance was also obtained and its IR spectrum is presented.
ON THE STABLE RADICAL CATION PRODUCED DURING THE PHOTOREDUCTION OF 9,9′-BIACRIDYL IN ETHANOL AND ITS ESR SPECTRUM
Authors: Niizuma Shigeya , Nakamaru Katsumi , Koizumi Masao
Published: July 2006

ESR spectrum due to 9,9′-biacriden radical cation (BAH2+·) was detected and its hfs was analysed. BAH2+· exists in the degassed acidic ethanol solution of 9,9′-biacridyl (BA) and biacriden (BAH2) and is also produced by the photoreduction of BA in the acidic ethanol. All the findings support the following equilibrium. BAH++BAH2+H+ (Remark: Graphics omitted.) 2BAH2+·.
TOPOCHEMICAL STUDIES. I. THE CRYSTAL AND MOLECULAR STRUCTURE OF POTASSIUM DIHYDROGEN trans-ACONITATE, K+(HOOC·CH2·C(COOH)=CH·COO)−
Authors: Fukuyama Keiichi , Kashino Setsuo , Haisa Masao
Published: July 2006

Crystals of potassium dihydrogen trans-aconitate, C6H5O6K, are monoclinic, a=11.856, b=15.920, c=8.426 Å, β=90.88°, Z=8, and space group C2/c. The structure was solved by the heavy-atom method and refined by block-diagonal least-squares method to R=0.060 for 1677 independent non-zero reflections measured by four-circle diffractometry. There are two types of hydrogen bonds; one is intramolecular (2.53 Å) and the other is intermolecular (2.52 Å). The distances between neighboring double-bonds are longer than 4.96 Å; hence the molecules are too far away to dimerize by ultraviolet light.
DECOMPOSITION OF 1-AZIDO-1,3-BUTADIENES
Authors: Isomura Kazuaki , Okada Masato , Taniguchi Hiroshi
Published: July 2006

The photolysis and the thermolysis of the title compounds (I) were studied. The photolysis of (I) at low temperature gave 3-alkenyl-1-azirine (II) but at room temperature gave (II), pyrrole (III) or butenonitrile (IV) depending on the nature of the substituents of (I). The thermolysis of (I) gave (III), (IV) or 2H-pyrrole (V).
SYNTHESIS OF o-ETHYNYLBENZALDEHYDE AND AN APPROACH TO DIBENZO[18]ANNULENE
Authors: Ojima Juro , Yokomachi Tadayoshi , Yokoyama Tai
Published: July 2006

A convenient synthesis of o-ethynylbenzaldehyde (VIII) has been developed. An approach to dibenzo[18]annulene from VIII has also been described.
SYNTHESIS AND SOME PROPERTIES OF 8,8′-DIHEPTAFULVENYL KETONE
Authors: Yagihara Morio , Kitahara Yoshio , Asao Toyonobu
Published: July 2006

8,8′-Diheptafulvenyl ketone has been synthesized, and its uv, ir, and nmr spectra were demonstrated, from which it can be concluded that a dipolar structure would largely contribute for the ground state, Some chemical properties of the compound has also been studied.
SOLVENT DEPENDENCE IN THE PHOTOCHEMICAL OXIDATION OF 6,6-DIMETHYLFULVENE AND ISOLATION OF 5-ISOPROPENYL-4-HYDROXY-2-CYCLOPENTENONE
Authors: Harada Nobuyuki , Uda Hisashi , Ueno Hiroshi
Published: July 2006

The photooxidation of 6,6-dimethylfulvene in benzene, carbon disulfide, chloroform, or acetone afforded preferentially 3,3-dimethyl-2(3H)-oxepinone (25∼30%), whereas in methanol 5-iso-propylidene-4-hydroxy-2-cyclopentenone was predominantly isolated (50%) after chromatography on alumina. Furthermore it has been found that 5-isopropenyl-4-hydroxy-2-cyclopentenone was also formed and easily isomerized to the above isopropylidene derivative during chromatography.
NEGATIVE TEMPERATURE DEPENDENCE OF THE PHOTOCHEMICAL (4+4) CYCLOADDITION OF FURAN TO α-NAPHTHONITRILE : EVIDENCE FOR EXCIPLEX INTERMEDIACY
Authors: Sugioka Taizo , Pac Chyongjin , Sakurai Hiroshi
Published: July 2006

The photochemical (4 + 4) cycloaddition of furan to α-naphthonitrile (α-NN) giving 1-cyano-9,10-benzo-11-oxatricyclo[4,2,2,12,5] undeca-3,7,9-triene (I) showed negative temperature dependency. An identical Arrhenius plot of γkrτ was obtained from both quantum yield and fluorescence quenching experiments. These results were interpreted as caused by reversible dissociation of an exciplex.
APPLICABILITY OF THE MO THEORY PROPOSED BY HIROTA TO FRAGMENT ION DISTRIBUTION AFTER CHARGE EXCHANGE REACTIONS ON ALKANES
Authors: Ikuta Shigeru , Yoshihara Kenji , Shiokawa Takanobu
Published: July 2006

The relation between the distribution of fragment ions and the recombination energy of the incident positive ions after bombardment of a series of n-alkanes with various positive ions has been studied by the use of a double mass spectrometer, TOHOKU CS, and the theory proposed by Hirota was tested.
SOLVOLYSIS OF ORGANIC PHOSPHATES. VII. SPONTANEOUS HYDROLYSIS OF 2,2,2-TRICHLOROETHYL PHOSPHATE
Authors: Murakami Yukito , Sunamoto Junzo , Kanamoto Naomi
Published: July 2006

The spontaneous hydrolysis of 2,2,2-trichloroethyl phosphate was investigated at 90°C in aqueous media with an ionic strength of 0.10 (KNO3) over pH 3–5. The reaction followed apparent first-order kinetics with respect to the phosphate species. Trichloroethanol once produced during the reaction was further hydrolyzed with the liberation of hydrochloric acid. However, the liberation of hydrochloric acid has never been detected unless the phosphate was hydrolyzed. No significant participation of the neighboring β-chlorine atom was observed in the phosphate hydrolysis.
MOLECULAR ARRANGEMENT IN THE NEMATIC DROPLET
Authors: Nakamizo Minoru , Sakagami Sakumitsu , Takase Akira
Published: July 2006

Optical studies were made of the molecular arrangement in the nematic droplet which was allowed to remain stable over the temperature range of the nematic mesophase. A new model of the molecular arrangement was proposed to explain the observed changes of the microscopic pattern.
STUDIES ON THE METAL CHELATES OF cis- AND trans-2-AMINOCYCLOHEXANECARBOXYLIC ACIDS
Authors: Kidani Yoshinori , Saito Reiko , Koike Hisashi
Published: July 2006

Metal chelates of cis- and trans-2-aminocyclohexanecarboxylic acids with divalent metals were newly synthesized and the binding ratios were found to be 2:1. Measurements of pKa of cis- and trans-ligands, as well as the stability constants of Cu and Ni chelates were performed and the stability constants of cis chelates were found to be larger than those of the corresponding trans chelates.
EFFECT OF PRESSURE ON THE RATE OF SOLVOLYSIS. FORMOLYSIS OF 1-(P-SUBSTITUTED BENZYL)ETHYL TOSYLATES
Authors: Yamagami Chisako , Sera Akira
Published: July 2006

The pressure dependence of the formolysis rates of the title compounds was examined and activation volumes, ΔV\eweq, were calculated. Electron donating substituents in the aryl rings gave rise to less negative values of ΔV\eweq.
EFFECTIVE SEPARATION OF HAFNIUM(IV) FROM ZIRCONIUM(IV) AS PYRIDINIUM TERNARY HETEROPOLY SALTS
Authors: Murata Katsuo , Takemoto Shumei , Ikeda Shigero
Published: July 2006

The remarkable difference was observed between Zr(IV) and Hf(IV) in the formation of pyridinium ternary heteropoly salts. Separation of Hf(IV) from Zr(IV) using this simple precipitation reaction was examined.
ISOLATION AND CHARACTERIZATION OF TWO NEW DITERPENOIDS PROM LEUCOTHOE GRAYANA MAX.
Authors: Hamanaka Nobuyuki , Miyakoshi Hidehiro , Furusaki Akio , Matsumoto Takeshi
Published: July 2006

Structures of two new diterpenoids, grayanotoxin XIV and XV, have been determined as 2 and 3 respectively, by correlating with a known compound in the case of 2 and by X-ray diffraction in the case of 3.
THE REACTION OF N,N′-THIOBISPHTHALIMIDE WITH ARENESULFINIC ACIDS
Authors: Abe Yasuo , Tsurugi Jitsuo
Published: July 2006

The reaction of N,N′-thiobisphthalimide with arenesulfinic acids in the molar ratios of 1:1 and 1:2 produced N-(arenesulfonylthio)phthalimides and diarenesulfonyl sulfides, respectively.
SELINANE-TYPE SESQUITERPENES. ACOLAMONE AND ISOACOLAMONE
Authors: Niwa Masatake , Nishiyama Atsuko , Iguchi Masanobu , Yamamura Shosuke
Published: July 2006

Isolation of two new selinane-type sesquiterpenes, named acolamone (II) and isoacolamone (III), is described and their structures have also been elucidated in connection with the base catalyzed cyclization of an epoxygermacrone (IV), which has been derived from preisocalamendiol, leading to the formation of a selinane-type α,β-unsaturated ketone (V).
VACUUM DEPOSITION OF A QUINOLINIUM(TCNQ)2 THIN FILM
Authors: Yoshimura Susumu , Murakami Mutsuaki , Itoh Yoshimasa , Hasegawa Katsue
Published: July 2006

A thin film of a highly conducting organic semiconductor was obtained by direct evaporation of quinolinium(TCNQ)2 ion-radical salt. The temperature of the evaporation source was controlled so as to prevent the salt from decomposing and dissociating. Optical and electrical properties were investigated on the vacuum-deposited thin films.
COULOPOTENTIOGRAPHY
Authors: Fujinaga Taitiro , Okazaki Satoshi , Yamada Takeshi
Published: July 2006

A new electrolytic method, coulopotentiography, has been developed, in which total current i.e. the number of coulombs is recorded against the electrode potential, in contrast to the polarography in which diffusion current is measured. The total set-up (Figure 1) and the recorded coulopotentiogram (Figure 2) are shown with the discussion of the present method from the stand point of analytical methodologies.
RADIOLYTIC DECHLORINATION OF POLYCHLORINATED BIPHENYLS (PCB) IN ORGANIC SOLUTIONS
Authors: Sawai Takeshi , Shinozaki Yoshiharu
Published: July 2006

The radiolytic dechlorination from PCB in organic solutions, has been studied. The chain reaction does not occur in neutral alcoholic solutions and alkaline methanol solution but occurs in alkaline 2-propanol solutions, and G(Cl−) reaches about 450 at 5×10−2 M potassium hydroxide concentration.
FERRICINIUM ION AS THE OXIDIZING REAGENT IN THE CHEMILUMINESCENCE REACTION OF LUMINOL IN ORGANIC SOLVENT-WATER MIXTURES
Authors: Matsumoto Tamotsu , Sato Masanori
Published: July 2006

In the presence of ferricinium ion, the chemiluminescence of luminol is observed in alkaline acetonitrile-water and methanol-water mixtures. The emission intensity is as strong as that observed in the presence of ferricyanide ion. The luminescence decays exponentially within a second.
A PRELIMINARY STUDY ON THE RADIOLYSIS OF CHLOROFLUOROCARBONS
Authors: Tominaga Takeshi , Iwata Ren , Makide Yoshihiro
Published: July 2006

The radiolysis products from liquid CF2Cl2, CFCl3, CF2ClCF2Cl and their mixtures with bromine were analyzed by gas chromatography. The C–Cl and C–C bonds appear to be broken far more readily than the C–F bond in the γ radiolysis of these chlorofluorocarbons.
THE ESR SPECTRA OF THE ANION RADICALS OF 2-METHOXYTROPONE AND ITS DERIVATIVES
Authors: Ikegami Yusaku , Watanabe Hidetoshi , Seto Shuichi
Published: July 2006

The ESR spectrum of the 2-methoxytropone anion radical has been examined. The radical was generated by electrolytic reduction of the neutral species in N,N-dimethylformamide. Hyperfine splitting constants of the ESR spectrum were reasonably assigned by comparison with the calculated spin densities. 5-Methyl, 5-isopropyl, and 5-nitro derivatives of 2-methoxytropone have also been examined in a similar way.
THE POLARITY EFFECTS ON THE YIELD OF THE TRAPPED ELECTRON PRODUCED IN GLASSY ALCOHOLS
Authors: Sasaki Teikichi , Ohno Shin-ichi , Kawatsura Kiyoshi
Published: July 2006

The yields of the trapped electron produced in alkyl alcohol and ethylene glycol at 77 °K glasses were determined. For all alcohol glasses, the yields declined in the high dose irradiation of gamma rays. It has been shown that the maximum concentration of the trapped electron increases with dielectric constant of the alcohol.
MOLECULAR ASSOCIATION OF THE 1:2 COMPLEXES OF COPPER(II) WITH AMINO ACIDS IN AQUEOUS MEDIA
Authors: Yokoi Hiroshi , Isobe Taro
Published: July 2006

The ESR experiments show that the 1:2 complexes of copper(II) with amino acids are present in frozen aqueous solution as a kind of aggregates, whose structures are different from those in crystals, and the aggregates disperse into dimers and monomers in the frozen aqueous solutions containing alcohols, protein denaturants, or certain inorganic salts.
OPTICAL DETECTION OF ELECTROCHEMICALLY GENERATED UNSTABLE REDUCTION INTERMEDIATES OF TRIS(2, 2′-BIPYRIDINE)CHROMIUM(III) BY REFLECTIVITY MEASUREMENT AT SILVER ELECTRODE IN PROPYLENE CARBONATE
Authors: Sato Yuichi
Published: July 2006

Tris(2, 2′-bipyridine)chromium(III) perchlorate gave three step reduction waves ascribed to [Cr(bipy)3]3+ \xrightarrowe [Cr(bipy)3]2+ \xrightarrowe [Cr(bipy)3]+ \xrightarrowe [Cr(bipy)3]0 on Ag electrode in propylene carbonate. Simultaneously recorded reflectivity-potential curve shows three steps of reflectivity decrease corresponding to the each wave on i-E curve. Absorption spectra due to the unstable low valence state of the complex produced during the electrolysis have successfully been obtained by the plotting of the reflectivity change at each step vs. wavelength.
A KINETIC STUDY OF TRICHLOROSILYL RADICAL ADDITION TO ETHYLENE IN THE GAS PHASE
Authors: Dohmaru Takaaki , Nagata Yoshio , Tsurugi Jitsuo
Published: July 2006

A kinetic study of the photolytic reactions of trichlorosilane with ethylene in the presence of acetone has revealed that the addition of trichlorosilyl radicals to ethylene becomes appreciably reversible around 200°C in the gas phase. ΔH value for the addition of trichlorosilyl radicals to ethylene estimated in this study is about 16 kcal/mol.
X-RAY CRYSTALLOGFAPHIC DETERMINATION OF PREROTUNDIFURAN
Authors: Hirotsu Ken , Shimada Akira
Published: July 2006

Crystal and molecular structure of a new diterpenoid, prerotundifuran, the constituent of Vitex rotundifolia, has been determined by the X-ray method.
THE 3250 A He–Cd LASER EXCITED RESONANCE RAMAN EFFECT OF PdBr42−
Authors: Hamaguchi Hiro-o , Harada Issei , Shimanouchi Takehiko
Published: July 2006

The rigorous resonance Raman effect was observed for the square planar PdBr42− ion, using the ultraviolet line of a He–Cd laser as the exciting source. The overtone progression of the totally symmetric vibration was observed up to the fourth.
CHLORINE PURE QUADRUPOLE RESONANCE IN CARBON TETRACHLORIDE EVIDENCE FOR PHASE TRANSITIONS
Authors: Murata Shigeo , Fujita Kazuyoshi , Suhara Masahiko
Published: July 2006

The temperature dependence of 35Cl PQR frequency in CCl4, has been measured at 77 to 110 K. Three discontinuous behaviors, which are attributable to phase transitions, were found in the temperature regions, 77–90, 90–100, and 90–110 K.
CHEMICAL REACTIONS OF ELECTRON DONOR-ACCEPTOR SYSTEMS: THERMAL [2+2] CYCLOADDITION REACTIONS OF SOME AROMATIC-SUBSTITUTED OLEFINS WITH TETRACYANOETHYLENE
Authors: Nagata Jun-ichiro , Shirota Yasuhiko , Nogami Takashi , Mikawa Hiroshi
Published: July 2006

Some aromatic-substituted olefins, e.g., acenaphthylene, indene, and 1-vinylpyrene cycloadded thermally to tetracyanoethylene to give the corresponding cyclobutane derivatives, the reactivity of the olefins increasing with a decrease in their ionization potentials. With 1-vinylnaphthalene Diels–Alder addition of tetracyanoethylene was favored over [2+2] cycloaddition, and with 1,2-dihydronaphthalene, dehydrogenation by tetracyanoethylene occurred to give naphthalene and tetracyanoethane.
THE STEREOSPECIFIC PREPARATION OF TRISUBSTITUTED OLEFINS
Authors: Kobayashi Susumu , Takei Hisashi , Mukaiyama Teruaki
Published: July 2006

Ethyl (E)-3-methyl-2-heptenoate, 6, or ethyl (Z)-3-methyl-2-heptenoate, 8, was prepared in high yield with the perfect retention of configuration by the reaction of ethyl (E)-3-phenylthio-2-butenoate, 5, or (Z)-3-phenylthio-2-butenoate, 7, with n-butylmagnesium bromide and cuprous iodide, respectively.
STUDIES ON THE MECHANISM OF REACTION BETWEEN SULFUR AND OXYGEN ON A MOLYBDENUM SURFACE BY MEANS OF AUGER ELECTRON SPECTROSCOPY–THE WORKING STATE OF THE CATALYST SURFACE–
Authors: Kawai Tomoji , Kunimori Kimio , Kondow Tamotsu , Onishi Takaharu , Tamaru Kenzi
Published: July 2006

A direct observation of the “working state of the catalyst” by Auger Electron Spectroscopy during the reaction between segregated sulfur and gaseous oxygen on molybdenum revealed that the reaction takes place through the direct interaction between the ambient oxygen molecules and the surface sulfur at lower temperatures, whereas it proceeds predominantly between the sulfur and the chemisorbed oxygen at higher temperatures.
THE PHOTOCHEMICAL REACTION OF 3,5-DISUBSTITUTED ISOXAZOLES
Authors: Sato Tadashi , Yamamoto Koichi , Fukui Keitaro
Published: July 2006

3,5-Dimethyl-, 3-methyl-5-phenyl-, and 5-methyl-3-phenylisoxazole suffered a photo-induced solvent attack, as well as the usual photo-transposition isomerization, to give open-chain compounds as the main product. No solvent participation was, however, observed with 3,5-diphenylisoxazole.
THE CRYSTAL STRUCTURE OF PYRAZINE-2,3-DICARBOXYLIC ACID DIHYDRATE
Authors: Takusagawa Fusao , Shimada Akira
Published: July 2006

The crystal structure of pyrazine-2,3-dicarboxylic acid dihydrate has been determined by X-ray diffraction method. The lone pairs of N atoms in the pyrazine ring participate in H-bonds, while some lone pairs of O atoms are free from H-bonds. This fact suggests that the O–H···N bond is energetically more favored than the O–H···O bond in carboxylic acids with an aromatic six-membered ring.
THERMAL DECOMPOSITION OF 1,2-BIS(HYDROXYDIPHENYLMETHYL) COMPOUNDS
Authors: Toda Takashi , Saito Katsuhiro , Mukai Toshio
Published: July 2006

Thermal decomposition of 1,2-bis(hydroxydiphenylmethyl) compounds was investigated for the formation of olefins. Several examples showed that the reaction was useful for olefin synthesis; however, in some cases retro Diels–Alder and dehydration reactions took place. The reaction mechanisms for the formation of the olefins and other products were discussed.
URANYL ION-PHOTOSENSITIZED AQUATION OF HEXACYANOCOBALTATE(III) ION
Authors: Matsushima Ryoka
Published: July 2006

A monochromatic 436 nm irradiation of Co(CN)63− in a degassed aqueous phosphoric acid solution in the presence of the uranyl ion led to photoaquation of the complex without chemical changes in the uranyl ion, with the apparent quantum yield of 0.1, whereas direct photoaquation in the absence of the sensitizer was negligible under similar conditions. No thermal reaction was found. Stern-Volmer relationship was obtained for the quenching of the uranyl emission by the complex, with the quenching constant of 38 M−1. Energy transfer from the lowest triplet state of the uranyl ion to the lowest ligand field triplet state of the complex was likely involved.
A NEW TRICYCLOUNDECANE INTERMEDIATE IN AN ADAMANTANE REARRANGEMENT
Authors: Taka-Ishi Naotake , Inamoto Yoshiaki , Aigami Koji
Published: July 2006

Isolation and characterization of a true intermediate in the adamantane rearrangement was made for the first time in the case of aluminum chloride-catalyzed isoraerization of either tricyclo[5.2.2.02,6]undecane (I) or tetramethylenenorbornane (II) to 1-methyladamantane, the intermediate in either case being tricyclo(5.3.1.03,8]undecane (III) as determined by 13C nmr spectroscopy.
INTERMEDIATES ON THE TRICYCLOUNDECANE REARRANGEMENT SURFACE
Authors: F\v{a}rca\c{s}iu Malvina , Blanchard Kenneth R , Engler Edward M , Schleyer Paul vR
Published: July 2006

Tricyclo [5.3.1.03,8]undecane (VI) was identified as one of the several intermediates observed during the aluminum halide isomerization of 2,3-tetramethylene norbornane (III) to the methyl adamantanes (IV). Empirical force field (strain) calculations predict that many tricycloundecanes have comparable stabilities.
THE CARBOXYLATION OF ACTIVE METHYLENE COMPOUNDS WITH UREA DERIVATIVES AND CO2. A MODEL REACTION FOR THE BIOTIN-PROMOTED CARBOXYLATIONS
Authors: Otsuji Yoshio , Arakawa Munekazu , Matsumura Noboru , Haruki Eiichi
Published: July 2006

A variety of active methylene compounds was carboxylated by employing the reagent system, dicyclohexylcarbodiimide-tetraalkylammonium hydroxide-CO2 or lithium salts of urea derivatives-CO2 in DMF at room temperature.
TRICHLOROVANADIUM(III)-CATALYZED OXIDATION OF TRIPHENYLPHOSPHINE
Authors: Chimura Yasuo , Kanai Hiroyoshi , Yoshida Satohiro , Tarama Kimio
Published: July 2006

Vcl3 catalyzes the oxidation of PPh3 to OPPh3 with oxygen in CH3CN. By kinetic investigation the mechanism involving a dioxygen complex of VCl3 as an intermediate is proposed and its reactivity toward PPh3 is shown to be greater than that of Pt(PPh3)2O2.
PHOTOELECTRON SPECTROSCOPY OF CYCLOHEXANE, CYCLOPENTANE, AND SOME RELATED COMPOUNDS
Authors: Ikuta Shigeru , Yoshihara Kenji , Shiokawa Takanobu , Jinno Masafumi , Yokoyama Yu , Ikeda Shigero
Published: July 2006

Photoelectron spectra of cyclohexane, cyclopentane, n-hexane and n-pentane have been studied. The vibrational structures of cyclohexane parent ion were clearly observed. The vibrational spacing is about 1160 cm−1 which can be assumed due to the C–C stretching vibrations. This spectrum was compared with the breakdown curves by charge exchange.
ON THE SYNTHESIS OF MONOMERIC METHACRYLOYLAMINO DERIVATIVES OF PURINE BASES
Authors: Kondo Koichi , Hisaoka Yukiko , Takemoto Kiichi
Published: July 2006

Three sorts of methacryloylamino derivatives of adenine and theophylline were prepared by allowing 9-(2-aminoethyl)adenine and 7-(2-aminoethyl)theophylline to react with methacryloyl chloride in dimethylformamide-pyridine solution at room temperature. Free-radical polymerization and copolymerization of 7-(2-methacryloylaminoethyl)theophylline were studied.
EFFECT OF SOLVENTS ON SPECTRA UNDER HIGH PRESSURE. THE SOLVATOCHROMISM OF 1-ETHYL-4-CARBOMETHOXYPYRIDINIUM IODIDE (Z-VALUE)
Authors: Tamura Katsuhiro , Imoto Tatsuya
Published: July 2006

The charge–transfer absorption spectra of the title compound have been measured for seven solvents at 25°C over the pressure range 1–1960 kg/cm2. The effect of the solvents on the shift of λmax with pressure was remarkable in a series of alcohols. The λmax for methanol and ethanol shifted to the red, while for the other alcohols it shifted to the blue. This may be one of the interesting behavior based on the hydrogen bonding between the solute and the solvents.
MÖSSBAUER SPECTROSCOPIC STUDIES ON CRYSTALLOGRAPHIC PHASE TRANSITION IN Fe(py)2Cl2 AND α-Co(py)2Cl2
Authors: Sano Hirotoshi , Kanno Mitsuko
Published: July 2006

Anomalies were found in the temperature dependence of quadrupole splitting of 57Fe in Fe(py)2Cl2 and α-(57Co, Co)(py)2Cl2 at 228°K and 160°K, respectively, when these compounds were prepared by “wet method”. The X-ray powder patterns of the compounds also show slight changes at the same temperatures. It was found that the materials prepared by “dry metho” remain in the high temperature phase even below the phase transition temperature.
EFFECT OF PRESSURE ON INTERSYSTEM CROSSING OF ANTHRACENE DERIVATIVES IN SOLUTION
Authors: Tanaka Fujio , Osugi Jiro
Published: July 2006

The pressure dependences of the fluorescence yields for anthracene, 1-, 2-, 9-methylanthracene, 1-, 2-, and 9-chloroanthracene were obtained in n-hexane at room temperature up to 3000 kg/cm2.

Results were interpreted in terms of a change of Franck–Condon factor in the intersystem crossing rate.
STEROID BIOSYNTHESIS. RELATIVE EFFICIENCIES OF ENZYMIC TRANSFORMATION OF TERMINALLY MODIFIED SQUALENE 2,3-OXIDE ANALOGS INTO LANOSTEROL ANALOGS BY 2,3-OXIDOSQUALENE CYCLASE
Authors: Shishibori Tsuyoshi , Fukui Takashi , Suga Takayuki
Published: July 2006

The incubation of terminally modified squalene 2,3-oxide analogs with the enzyme preparation of hog liver yielded the corresponding lanosterol analogs, respectively, at different conversion rates. The interaction of 2,3-oxidosqualene cyclase with the substrates has thus been found to be influenced by the bulk of the terminal moiety.
STRIPPING COULOPOTENTIOGRAPHY
Authors: Fujinaga Taitiro , Okazaki Satoshi , Yamada Takeshi
Published: July 2006

A new electroanalytical method, for the determination of trace quantities of metal ions, has been developed by the combination of direct coulopotentiography with preliminary column electrolysis. The new method is more sensitive than the direct method; the sensitivity reaches down to 10−8M.

The present method is also applicable to the practical automated trace analysis of the flowing samples.
REACTIONS OF 2-ALKYL-2-LITHIO-1,3-DITHIANES WITH PYRIDINE
Authors: Taguchi Takeo , Nishi Mineo , Watanabe Kenzo , Mukaiyama Teruaki
Published: July 2006

It was found that 2-alkyl-2-(4-pyridyl)-1,3-dithiane [II] is obtained in fairly good yield by the reaction of 2-alkyl-2-lithio-1,3-dithiane with pyridine followed by the subsequent oxidation with p-benzoquinone or air. N-Acyl-1,4-dihydropyridine derivative [III] was isolated by treating the adduct [I] of 2-alkyl-2-lithio-1,3-dithiane and pyridine with acyl chloride. Further, it was found that 2,2′-dipyridyl is obtained in 74% yield by refluxing 2-benzyl-2-lithio-1,3-dithiane with excess amount of pyridine in tetrahydrofuran.
SYNTHESIS OF ALPINUM ISOFLAVONE, OSAJIN AND WARANGALONE
Authors: Jain A C , Sharma B N
Published: July 2006

Genistein 1 when heated with prenyl bromide in the presence of methanolic methoxide yielded 7,4′-di-O-prenyl-(2), 6,8-di-CC-prenyl-(3) and 6-C-prenyl-(4) qenisteins. Structures of these compounds were established by NMR spectra of themselves and their derivatives. Oxidative cyclisation of (4) with DDQ afforded natural alpinum isoflavone (6); whereas that of (3) gave a mixture of natural osajin (8) and warangalone (7) which were separated by chromatography and identified by mass spectra.
PHOTOLYSIS OF POLY-l-SILVER GLUTAMATE
Authors: Konishi Yosiaki , Saijo Hiroshi
Published: July 2006

The film of poly-l-silver glutamate was photolyzed when irradiated at wavelength 253.7 nm. With irradiation the surface of the film finally turned into a metallic mirror due to the photolytic silver. This result is interpreted by assuming the primary photochemical process associated with one electron transfer from the carboxylate ion to the adjacent silver ion.
ALKILATION OF PHENOL WITH METHANE OVER SOLID ACIDS AND BASES
Authors: Nishizaki Tadao , Tanabe Kozo
Published: July 2006

The alkylation over SiO2–Al2O3, SiO2–TiO2, Al2O3, MgO or MgO–Al2O3 was carried out at 400–500°C and atmospheric pressure. Though SiO2–TiO2, MgO and MgO–Al2O3 were catalytically inactive, A12O3 formed 4–8% cresols and about 1% xylenol, while SiO2–Al2O3 gave 1–3% cresols and 3.5% xylenols together with 7–14% diphenylether.
THE ESR SPECTRA OF THE NITROTROPOLONATE ANION RADICALS
Authors: Ikegami Yusaku , Seto Shuichi
Published: July 2006

Electrolyses of 5-nitro-, 3-nitro, and 3,5-dinitro-tropolones in N,N-dimethylformamide generated the corresponding tropolonate anion radicals. Hyperfine structures in the ESR spectra of the radicals were reasonably explained by the spin density calculations. The results for the 3-nitro- and 3,5-dinitro-tropolonates suggested that the 3-nitro groups were twisted about 40 and 55°, respectively, from the ring plane.
A MONOCYANO-EDTA COBALTATE(III) COMPLEX: Na2[Co(CN)edta]·4H2O
Authors: Maki Nobufumi
Published: July 2006

The preparation of a novel cyano-EDTA cobalt(III) complex, in which the edta4− ion acts as a pentadentate ligand, has successfully been accomplished by treating the monocyanoiodotetramminecobalt(III) iodide with tetrasodium ethylenediaminetetraacetate dihydrate, Na4edta·2H2O.
THE CRYSTAL STRUCTURE OP 3-HYDROXY-4-METHOXYBENZALDEHYDE (ISOVANILLIN)
Authors: Iwasaki Fujiko
Published: July 2006

The crystal structure of isovanillin was determined by a three-dimensional X-ray analysis. The molecules are linked by the O–H···O hydrogen bond (2.741 Å) between the hydroxyl and aldehydic groups and form a linear chain approximately perpendicular to the b axis and parallel to the (201) plane.
THE OCCURRENCE OF VOMIFOLIOL, DEHYDROVOMIFOLIOL AND DIHYDROPHASEIC ACID IN THE ROOTS OF “KIDNEY BEAN” (PHASEOLUS VULGARIS L.)
Authors: Takasugi Mitsuo , Anetai Masaki , Katsui Nobukatsu , Masamune Tadashi
Published: July 2006

Three abscisic acid-related compounds, vomifoliol, dehydrovomifoliol and dihydrophaseic acid, the latter two being new compounds, have been isolated from the roots of “kidney bean” and proved to possess the same absolute configuration at the carbon atom corresponding to C6 (= C1′) of abscisic acid.
FORMATION OF β,γ-UNSATURATED KETONES BY THE DEACETYLATION OF 3-(1-ALKENYL)-2,4-PENTANEDIONES CATALYZED BY METAL SALTS
Authors: Uehara Kaku , Kitamura Fujio , Tanaka Makoto
Published: July 2006

A general method of obtaining β,γ-unsaturated ketone was provided by the deacetylation of 3-(1-alkenyl)-2,4-pentanedione in the presence of metal acetate (M(OAc)n) or acetylacetonate (M(acac)n). Zn(OAc)2, pb(OAc)2, Cd(OAc)2, Fe(acac)3, and Zn(acac)2 were found to be effective catalysts. 4-Hepten-2-one, 4-hexen-2-one, 5-methyl-4-hexen-2-one, and 5-phenyl-4-penten-2-one were given in high yields.
PYRROLIZIDINE ALKALOIDS. SYNTHESIS AND CONFIGURATION OF FULVINIC AND CRISPATIC ACIDS
Authors: Matsumoto Takashi , Fukui Kenji , Edwards J D
Published: July 2006

Stereochemistry of the Reformatsky reaction of 3-phenyl-2-butanone with methyl α-bromopropionate has been studied. Subsequently, fulvinic and crispatic acids have been synthesized and their configurations have also been assigned.
A CONVENIENT METHOD FOR THE REDUCTION OF SULFIDES AND VINYLIC OR AROMATIC HALIDES BY USING TiCl4 AND LiAlH4
Authors: Mukaiyama Teruaki , Hayashi Masatoshi , Narasaka Koichi
Published: July 2006

Various kinds of sulfides and vinylic or aromatic halides were easily reduced by the combined use of TiCl4 and LiAlH4 to give the corresponding hydrocarbons in high yields.
FLUORESCENCE LIFETIMES AND QUANTUM YIELDS OF ACRIDINE DYES BOUND TO DNA
Authors: Kubota Yukio
Published: July 2006

The fluorescence lifetimes and quantum yields of various acridine dyes bound to DNA have been measured at a high ratio of DNA phosphate to dye (P/D ratio). The nature of binding sites are discussed on the basis of the values of the observed lifetimes, quantum yields, and the calculated natural lifetimes.