bluuebunny/crossref_metadata_2025 huggingface dataset:
SYNTHESIS OF RIPARIOCHROMENE B AND RIPARIOCHROMENE C
Authors: Nakayama Mitsuru , Hayashi Shûichi , Tsukayama Masao , Horie Tokunaru , Masumura Mitsuo
Published: July 2006

The condensation of 7-hydroxy-2,2-dimethylchroman (III) and benzoyloxyacetonitrile gave 7-hydroxy-6-benzoyloxyacetyl-2,2-dimethylchroman (IV). 7-Hydroxy-6-acetoxyacetyl-2,2-dimethylchroman (VIII) was obtained from IV via four steps. The dehydrogenation of VIII with DDQ in dry toluene afforded ripariochromene B (I). Ripariochromene C (II) also was synthesized in a similar manner.
THE BIOSYNTHESIS OF ALOENIN IN ALOE ARBORESCENS MILL. VAR. NATALENSIS BERGER
Authors: Suga Takayuki , Hirata Toshifumi , Koyama Fumihiro , Murakami Eiko
Published: July 2006

The 14C-labeling pattern in aloenin (I) biosynthesized from [2-14C]malonate, [1-14C]acetate, [1-14C]- and [3-14C]phenylalanine, and [methyl- 14C]methionine in Aloe arborescens Mill. var. natalensis Berger demonstrated that the carbon skeleton of aloenin is generated by the acetate-malonate pathway and that the methyl of the methoxyl group is originated from methionine.
DEOXYGENATION OF EPOXIDES TO OLEFINS WITH FeCl3–n-BuLi SYSTEM
Authors: Fujisawa Tamotsu , Sugimoto Kikuo , Ohta Hiromichi
Published: July 2006

Deoxygenation reaction of epoxides with iron(III) chloride–n-butyllithium system gave olefins in high yields under mild reaction conditions.
PHOTOCHEMICAL OXIDATION OF 6,6-DIARYLFULVENES
Authors: Harada Nobuyuki , Kudo Soichi , Uda Hisashi , Utsumi Shun-ichi
Published: July 2006

Sensitized photooxidation of 6,6-diphenylfulvene afforded 1,4-ketol, 2 (3H)-oxepinone, and 4-phenyl-3-chromene derivatives, all of which arose from 1,4 addition of oxygen. While, 6,6-di-p-anisylfulvene gave, in addition to 1,4-ketol, 1,2 oxygen addition products as minor components. Reactions of 6,6-di-p-anisylfulvene 1,4-epidioxide have been also investigated.
EFFECTS OF AMINES ON THE DIMERIZATION OF ISOPRENE CATALYZED BY BIS(TRIPHENYLPHOSPHINE)NICKEL DICHLORIDE REDUCED BY SODIUM BOROHYDRIDE
Authors: Mochida Isao , Yuasa Shigeki , Seiyama Tetsuro
Published: July 2006

Amines introduced into the dimerization of isoprene catalyzed by Ni(PPh3)2Cl2–NaBH4 gave significant effects on the catalytic activity and selectivity. Yield of linear dimers was 60% by n-propylamine, whereas it was only 3% by tert-butylamine. The formation of cyclo dimers was increased by pyridine and its derivatives.
THE EQUILIBRIUM AND KINETIC STUDIES OF THE REACTION OF ETHYLENEDIAMINETETRAACETATOAQUACHROMATE(III) ION WITH ACETATE ION
Authors: Ogino Hiroshi , Watanabe Toshiyuki , Tanaka Nobuyuki
Published: July 2006

The equilibrium constant, K, and the rate constants for the reaction,

Credta(H2O)−+OAc− (Remark: Graphics omitted.) Cr(OAc)edta2−+H2O

were determined spectrophotometrically to be 0.61 M−1 for K, 8.7 M−1 s−1 for kf and 14 s−1 for kb at ionic strength 1.0 (NaClO4) and 25 °C.
HIGH CATALYTIC ACTIVITY OF IRON SULFATES FOR FRIEDEL-CRAFTS TYPE BENZYLATION OF TOLUENE WITH BENZYL CHLORIDE
Authors: Arata Kazushi , Toyoshima Isamu
Published: July 2006

Ferrous and Ferric sulfates prepared by calcining their hydrates in air showed surprisingly high catalytic activity and selectivity for the title reaction, and also catalyzed the benzoylation of toluene.
MONODEHYDRO-5,5′-IMINODIBARBITURIC ACID, A RADICAL PRODUCED BY THE REDUCTION OF MUREXIDE
Authors: Kurata Tadao , Fujimaki Masao
Published: July 2006

The reduction of murexide with some reducing reagents such as l-cysteine (CySH) gave a stable radical product which was considered to be monodehydro-5,5′-iminodibarbituric acid from the results of ESR spectroscopy.
ENANTIOFACE DIFFERENTIATING (ASYMMETRIC) HYDROGENATION OF METHYL ACETOACETATE WITH MODIFIED RANEY NICKEL
Authors: Ozaki Hiroshi , Tai Akira , Izumi Yoshiharu
Published: July 2006

Rate studies of the liquid phase hydrogenation of methyl acetoacetate were carried out on the Raney nickel catalyst modified with optically active substances.

The results are as follows ; 1) Both the optical yield of product and the rate of hydrogenation were controlled by the nature of modifying reagents but no direct correlation was present between them. 2) The apparent activation energy of hydrogenation was not varied with the change of modifying reagents.

The most probable rate-controlling process of hydrogenation was the surface reaction. The optical yield of product was not explained by the simple kinetic controlled differentiation. Details of differentiating process still remained equivocal.
INTERCONVERSION OF PTEROSINS, ILLUDOID SESQUITERPENES: SYNTHESIS OF ONITIN (4-HYDROXY-PTEROSIN Z) AND (±)-PTEROSIN D
Authors: Hayashi Yuji , Nishizawa Mugio , Sakan Takeo
Published: July 2006

Two pterosins, onitin (5) (4-hydroxy-pterosin Z) and (±)-pterosin D (6), were synthesized from pterosin Z (3) by chemical transformations.
MÖSSBAUER EFFECT OF 119Sn IN THE THERMAL DECOMPOSITION PRODUCTS OF TIN(IV) SULFIDE
Authors: Ichiba Sumio , Katada Motomi , Negita Hisao
Published: July 2006

Tin sesquisulfide, Sn2S3, was obtained as a single phase through thermal decomposition of SnS2. The Mössbauer parameters of the phase were not the same as those of the mixture of SnS and SnS2 and were consistent with those of Sn2S3.
A NOVEL SYNTHESIS OF ORGANIC SULFIDES FROM ORGANOLITHIUMS AND PHOSPHINODITHIOATE ESTERS
Authors: Goda Koshiro , Inamoto Naoki
Published: July 2006

n-Butyl or phenyl sulfides were synthesized by the reactions of n-butyl- or phenyllithium and diphenylphosphinodithioates in tetrahydrofuran in excellent yields.
FORMATION OF A NONALLYLIC HOMONERYL PYROPHOSPHATE BY FARNESYL PYROPHOSPHATE SYNTHETASE
Authors: Saito Akio , Ogura Kyozo , Seto Shuichi
Published: July 2006

The reaction of 4-methylpent-4-enyl pyrophosphate (1) with dimethylallyl pyrophosphate (2) catalyzed by farnesyl pyrophosphate synthetase (prenyltransferase) results in an exclusive cis condensation to give a nonallylic homoneryl pyrophosphate (3).
A NEW METHOD FOR THE PREPARATION OF α-DIKETONES BY THE PHOTO-OXIDATION OF β-KETOALKYLPYRIDINIUM IODIDES
Authors: Mukaiyama Teruaki , Atsumi Kunio , Takeda Takeshi
Published: July 2006

α-Diketones were obtained in good yields by the photo-oxidation of β-ketoalkylpyridinium iodides in the presence of tetra-n-butylammonium iodide.
A CONVENIENT METHOD FOR THE SYNTHESIS OF CARBOXYLIC ESTERS
Authors: Mukaiyama Teruaki , Usui Masahiro , Shimada Eiichiro , Saigo Kazuhiko
Published: July 2006

The equimolar reactions of carboxylic acids and alcohols with 1-methyl-2-halopyridinium salts in the presence of two equimolar amounts of tri-n-butylamine afforded the corresponding carboxylic esters in good yields.
A CONVENIENT METHOD FOR THE PREPARATION OF UNSYMMETRICAL ETHERS AND IT’S APPLICATION TO THE SYNTHESIS OF ROSE OXIDE AND DIHYDRO ROSE OXIDE
Authors: Ishikawa Hiroshi , Ikeda Shigeru , Mukaiyama Teruaki
Published: July 2006

Alkyl 2,4-dichlorophenyl acetals react with Grignard reagents in aromatic hydrocarbons such as benzene or toluene at room temperature to afford the corresponding unsymmetrical ethers in good yields. The utility of this new procedure is demonstrated by the synthesis of rose oxide and dihydro rose oxide.
STUDIES ON ELECTRODE PROCESSES OF OXOVANADIUM(IV). III. SOLVENT EFFECT ON REDUCTION POTENTIAL OF VANADYL ACETYLACETONATE
Authors: Kitamura Mitsutaka , Yamashita Kazuo , Imai Hideo
Published: July 2006

The correspondence of the reduction potential of vanadyl acetylacetonate and the wavelength of the optical absorption band was well recognized from the solvent effect on the ligand configuration. However, the noticeable deviation of the data in the aqueous solution was observed. The corelation to the donor number is also discussed.
THIOL-ACTIVATED SODIUM BOROHYDRIDE REDUCTION OF NITRO COMPOUNDS
Authors: Maki Yuji , Sugiyama Hiroshi , Kikuchi Katsuo , Seto Shuichi
Published: July 2006

Sodium borohydride under the presence of thiols reduced nitro compounds to amine, hydroxylamine, azo, and azoxy compounds.
THERMAL DECARBONYLATION OF QUINONES IN THE PRESENCE OF HYDROGEN
Authors: Sakai Tomoya , Hattori Masayuki
Published: July 2006

Non-catalytic thermal decarbonylation of quinone proceeded for 9,10-phenanthrenequinone, 1,4- and 1,2-naphthoquinones and p-benzoquinone as well as for 9,10-anthraquinone in the previous study. In the cases of 1,2-naphthoquinone and p-benzoquinone, however, the title reaction occurred only in 20 – 40% selectivity due to the consumption of feed quinones seemingly through simultaneous polymerization.
INFRARED SPECTRA AND ADHESION STRENGTH OF α-CYANOACRYLATE POLYMER FILMS
Authors: Shibasaki Toshikazu , Suëtaka Wataru
Published: July 2006

The infrared spectra of α-cyanoacrylate thin film on aluminum coupons and the adhesion strength of Al-α-cyanoacrylate-Al joints change depending upon the structure of oxide on aluminum. The adhesion strength may be related to the molecular orientation in adhesive layer which is affected by the surface structure of the oxide.
A FACILE SYNTHESIS OF CARBOXAMIDES BY USING 1-METHYL-2-HALOPYRIDINIUM IODIDES AS COUPLING REAGENTS
Authors: Bald Edward , Saigo Kazuhiko , Mukaiyama Teruaki
Published: July 2006

Carboxamides are rapidly formed in high yields by equimolar reactions of free carboxylic acids and amines, involving secondary or tertiary alkyl substituted acids and amines, with 1-methyl-2-halopyridinium iodides in the presence of tri-n-butylamine.
STEREOSELECTIVITY IN THE HOMOLYTIC REACTION OF EPIMERIC t-BUTYL 2,4,6-TRIMETHYL-1,3,5-TRITHIANE-2-PEROXYCARBOXYLATES
Authors: Arai Kazutaka , Iwamura Hiizu , Oki Michinori
Published: July 2006

Isomeric t-butyl 2,4,6-trimethyl-1,3,5-trithiane-2-peroxycarboxylates are found to show large difference in decomposition rates, the axial peroxycarboxylate decomposing much faster. Preferential formation of products by axial-attack of the intermediate radical is also observed when the peroxycarboxylates are decomposed in toluene.
THE EFFECT OF CHLORINE OR ITS COMPOUNDS ON THE REACTION OF η-Al2O3 WITH ZnO
Authors: Tsuchida Takeshi , Furuichi Ryusaburo , Ishii Tadao
Published: July 2006

The addition of a small amount of chlorine or its compounds (A1C13·6H2O and HCl) accelerated remarkably the reaction of η-Al2O3 with ZnO.
AMORPHOUS PHASE IN YTTRIUM-COBALT-BORON SYSTEM
Authors: Yajima Seishi , Okamura Kiyohito , Shishido Toetsu
Published: July 2006

By rapid quenching of the melt, an amorphous phase of yttrium-cobalt-boron system was obtained. The phase is stable at room temperature, and its crystallization takes place in the vicinity of 700°C on heating at 10°C/min. Electrical resistivity of the amorphous phase is constant at about 10−3Ωcm in the temperature range below 660°C; the variation in the resistivity with the transition from the amorphous to the equilibrium state was measured.
THE γ-RAY-INDUCED OXIDATION OF TOLUENE IN LIQUID CARBON DIOXIDE
Authors: Ishizaki Kaname , Sato Shin
Published: July 2006

The γ-radiolysis of the liquid-phase mixture of toluene and carbon dioxide has been studied at 0°C. The G-value of cresols accounted for 50% of the G-value of the decomposition of carbon dioxide. Speculation was offered on the precursor of cresols.
MICROWAVE SPECTRA AND MOLECULAR STRUCTURE OF gauche-ETHANETHIOL
Authors: Hayashi Michiro , Nakagawa Jun , Kuwada Kazunori
Published: July 2006

Microwave spectra of gauche-ethanethiol were studied in relation to its molecular structure. The rs structure of this molecule could be determined and was compared with that of trans isomer. Discussions were made on the angles around the carbon atom of the CH2 group in the molecule.
4,5:8,9-DIBENZO-2,10-CYCLOUNDECADIEN-6-YNE: A POTENTIAL PRECURSOR OF A NON-BRIDGED [11]ANNULENYL CATION
Authors: Dagan Arie , Shaw Guan-Su , Gazit Aviv , Rabinovitz Mordecai
Published: July 2006

Two geometrical isomers of 4,5:8,9-dibenzo-2,10-cycloundecadien-6-yne were prepared by a Wittig reaction between 2,2′-diformyldiphenylacetylene and trimethylenedi(triphenylphosphonium bromide). Their stereochemical configuration, cis,trans (I) and trans,trans (II) were deduced from the nmr spectral data. Attempts to use (I) and (II) as precursors to the [11]annulenyl cation (III) have so far not been realized.
HIGH RESOLUTION AUGER ELECTRON SPECTROSCOPY OF NITRIC OXIDE ADSORBED ON A TUNGSTEN SURFACE
Authors: Kunimori Kimio , Kawai Tomoji , Kondow Tamotsu , Onishi Takaharu , Tamaru Kenzi
Published: July 2006

High resolution Auger spectra indicate that NO is dissociatively adsorbed on a polycrystalline tungsten surface at room temperature.
NITROGEN-15 NUCLEAR MAGNETIC RESONANCE OF HISTIDINE. THE EFFECT OF pH
Authors: Kawano Keiichi , Kyogoku Yoshimasa
Published: July 2006

Natural abundance 15N nmr spectra of L-histidine, and τ- and π-methylhistidines were measured. The signal assignments to the τ- and π-nitrogen could be made by comparison of these spectra. From the pH titration of the 15N chemical shifts, it is directly proved that the τ-H tautomer is predominant in a basic solution.
BIOSYNTHESIS OF ISOPRENOID FROM AMINO ACID IN HIGHER PLANT. INCORPORATION OF l-VALINE INTO LINALOOL
Authors: Suga Takayuki , Hirata Toshifumi , Tange Keiji
Published: July 2006

l-[U-14C]Valine was incorporated into linalool (I) in cinnamomum Camphora Sieb. var. linalooliferum Fujita with 0.0055% at the highest value. The labeling pattern indicated that some of 3,3-dimethylallyl pyrophosphates originate from valine via an alternative route rather than through the mevalonoid pathway.
SYNTHESIS OF CACALOL
Authors: Inouye Yoshinobu , Uchida Yuji , Kakisawa Hiroshi
Published: July 2006

It is established that cacalol is 5,6,7,8-tetrahydro-3,4,5-trimethylnaphtho[2,3-b]furan-9-ol by synthesis in several steps from creosol methyl ether.
POLARIZED TRIPLET–TRIPLET ABSORPTION MEASUREMENTS WITH THE AID OF THE STRETCHED POLYMER FILM TECHNIQUE: PHENANTHRENE
Authors: Hoshi Toshihiko , Ota Kazuo , Shibuya Eiichi , Murofushi Kiyoshi
Published: July 2006

A procedure to measure a polarized triplet–triplet absorption spectrum using a stretched polymer film was described, and this method was applied to determine the polarizations of the triplet–triplet transitions of phenanthrene.
SQUID BIOLUMINESCENCE II. ISOLATION FROM WATASENIA SCINTILLANS AND SYNTHESIS OF 2-(p-HYDROXYBENZYL)-6-(p-HYDROXYPHENYL)-3,7-DIHYDROIMIDAZO[1,2-a]PYRAZIN-3-ONE
Authors: Inoue Shoji , Sugiura Sumi , Kakoi Hisae , Hasizume Kiyomatsu , Goto Toshio , Iio Hideo
Published: July 2006

2-(p-Hydroxybenzyl)-6-(p-hydroxyphenyl)-3,7-dihydroimidazo[1,2-a]pyrazin-3-one was isolated from the squid, Watasenia scintillans. Its structure was determined by synthesis. It is considered to be a precursor of hitherto unknown Watasenia luciferin or photoprotein.
C–S STRETCHING VIBRATIONS AND MOLECULAR CONFORMATIONS OF METHYL PROPYL SULFIDE AND RELATED ALKYL SULFIDES
Authors: Nogami Norimasa , Sugeta Hiromu , Miyazawa Tatsuo
Published: July 2006

Raman and infrared spectra of methyl propyl sulfide, ethyl methyl sulfide, and isobutyl methyl sulfide were measured. Correlations were found between C–S stretching frequencies and internal rotation about the C–CH2 and CH2–S bonds of the (Remark: Graphics omitted.)C–CH2–S–CH3 groups. The new correlations were applied for conformation studies of methionine groups.
INTERMEDIATORY FORMATION OF MESOIONIC IMIDAZOLIUM-4-OXIDES IN THE REACTION OF α-HALOACYL CHLORIDES WITH AMIDINES
Authors: Hamaguchi Masashi , Ibata Toshikazu
Published: July 2006

Reaction of α-haloacyl chlorides with benzamidines in the presence of triethylamine generated mesoionic imidazolium-4-oxides (2b) as intermediates which gave pyrroles on treatment with acetylenic compounds via 1,3-dipolar cycloaddition followed by extrusion of isocyanates.
SOME SOLID MOLECULAR COMPLEXES OF I2
Authors: Biswas Byomkesh
Published: July 2006

In water I2 combines with methylene blue, thionine, pararosaniline, crystal violet and acridine orange, and solid complexes precipitate out. The complex with methylene blue is 1:1 and shows a new absorption band in CHCl3 at 365 nm. It appears to be of the electron donor–acceptor type: n (dye)→σ* (I2).
KINETIC STUDY ON THE RADICAL ADDITION OF SODIUM HYDROGENSULFITE TO ALLYL ALCOHOL
Authors: Miyata Teijiro , Sakumoto Akihisa , Washino Masamitsu , Abe Toshihiko
Published: July 2006

The kinetics of the radical chain reaction of sodium hydrogensulfite with allyl alcohol In aqueous solutions was investigated. The apparent rate constant was found to be 4.69×10−4M·sec−1 at the dose rate of 1.35×1016 eV·g−1·sec−1. The kinetic chain length was estimated to be 345.
TEMPERATURE DEPENDENCE OF ESR SIGNAL OF ISOPROPANOL RADICAL FORMED BY UV IRRADIATION
Authors: Katayama Akiko , Ishikura Seizo , Itoh Hiroyuki , Kita Hideaki
Published: July 2006

ESR signals of isopropanol radical were observed at various temperatures. Methyl groups of the radical were found to freely rotate down to 77 K, but to be in a frozen state at 4 K. Experimental results were discussed with the results calculated by INDO. A specially designed Dewar vessel was used for measurements at 77 K and 4 K.
SYNTHESIS OF DIBENZO[f,l]- 8,10-BISDEHYDRO[17]ANNULENONE
Authors: Ojima Juro , Kimura Akihiko , Yokoyama Tai
Published: July 2006

An annelated [17]annulenone (3) was prepared starting from o-ethynylcinnamaldehyde (1) in order to examine the effect of annelation on the ring current of the inner seventeen membered ring. It was found that two benzene rings reduce a paramagnetic ring current arising from polarization of a carbonyl group in the inner ring.
THE SYNTHESIS OF Dl-TETRAHYDROANHYDROAUCUBIGENONE
Authors: Obara Heitaro , Kimura Hiroshi , Onodera Jun-ichi , Suzuki Masanobu
Published: July 2006

The racemate of tetrahydroanhydroaucubigenone (III), one of the derivatives of aucubin (I), was synthesized by the photo-irradiation of 2-(2′-nitrosoxyethyl)-7-oxabicyclo [3,3,0] octan-3-one (XV) which was obtained from 2-ethoxycarbonyl-7-oxabicyclo [3,3,0] octan-3-one (VIII) through seven steps.
SELECTIVE CARBON–CARBON BOND FORMING REACTIONS VIA S-ALLYL DITHIOCARBAMATES. REDUCTIVE DESULFURIZATION OF ALLYLIC DITHIOCARBAMATES
Authors: Nakai Takeshi , Shiono Hiroyuki , Okawara Makoto
Published: July 2006

A convenient method for the selective conversion of alkyl halides (R’X) to the olefins, R’CH=C(R)CH3, was established by α alkylation of the lithium salts of allylic dithiocarbamates (CH2=C(R)CH2SCSNMe2;R=H or Me) followed by reductive desulfurization of the α-coupled products with the specific Raney Ni. Dependence of regioselectivity in the reductive fission of the dithiocarbamate group upon both substrate and reducing agent is described in some details.
SYNTHESIS OF NEOBAVAISOFLAVONE
Authors: Nakayama Mitsuru , Hayashi Shûichi , Masumura Mitsuo , Horie Tokunaru , Tsukayama Masao , Yamada Toshihide
Published: July 2006

Condensation of 7-benzoyldaidzein (III) with 2-methyl-3-buten-2-ol gave 7-benzoyl-3′-(3-methyl-2-butenyl)daidzein (IV). Hydrolysis of IV with dilute alkali gave 3′-(3-methyl-2-butenyl)daidzein (neobavaisoflavone) (I), which was converted into isoneobavaisoflavone (VI) when heated with formic acid. 7-Benzyldaidzein (VII) was condensed with 2-methyl-3-buten-2-ol to give a chroman derivative (VIII), which was converted into VI by hydrogenolysis.
THE SYNTHESIS OF 2-AZA-ADENOSINE-3′,5′-CYCLIC PHOSPHATE VIA 1,N6-ETHENO-ADENOSINE-3′,5′-CYCLIC PHOSPHATE
Authors: Yamaji Nobuyuki , Kato Motohiko
Published: July 2006

Treatment of 2-aza-1,N6-etheno-c-AMP with NBS or Br2 under mild conditions gave 2-aza-c-AMP in a high yield. Therefore, the route c-AMP→2-aza-1,N6-etheno-c-AMP→2-aza-c-AMP offers an excellent way to synthesize the last compound.
SYNTHESIS OF 11-DESOXY-12-METHYLPROSTAGLANDINS
Authors: Godoy Libertad , Guzmán Angel , Muchowski Joseph M
Published: July 2006

The conjugate addition of lithium dimethyl copper to the tetrasubstituted enone (3b) gave a mixture of the keto esters (4a) and (4b), which was converted into the 11-desoxy-12-methylprostaglandins (14b), (15b), (16a) and (17a).
REACTIVITIES OF ALLYLCHLORIDES IN THE FRIEDEL-CRAFTS REACTION CATALYZED BY TUNGSTEN HEXACHLORIDE
Authors: Mochida Isao , Takeshita Kenjiro , Ohgai Michiharu , Tanaka Takao , Seiyama Tetsuro
Published: July 2006

The reactivities of substituted allyl chlorides have been studied in the alkylation reaction catalyzed by WCl6. The primary products were allyl benzenes, however, they suffered consecutive hydrochlorination to the extent, which depended on their structure. The reactivity order of the allyl chlorides was trans-CH3CH=CHCH2Cl>CH2=CHCH2Cl> trans-ClCH=CHCH2Cl>cis-ClCH=CHCH2Cl. This order may be explained in terms of electronic effects of substituent groups in the polarized-complex intermediates.
INFRARED AND MASS SPECTRAL STUDIES OF COMPLEXES OF BIS(HEXAFLUOROACETYLACETONATO)METAL(II) WITH 1,10-PHENANTHROLINE
Authors: Izumi Fujio , Kurosawa Ryoko , Kawamoto Hiroshi , Akaiwa Hideo
Published: July 2006

Mixed ligand complexes of the type M(hfa)2phen were prepared and IR, DTA-TG and MS were measured in order to investigate the stabilities of these complexes. Exceptional properties were observed for the Cu(II) complex on IR and MS measurements. The marked weakening of Cu–O bonds in the Cu(II) adducts is ascribed to the Jahn–Teller effect.
THE SYNTHESIS OF HYPACRONE, A NOVEL SECO-ILLUDOID SESQUITERPENE FROM HYPOLEPIS PUNCTATA METT.
Authors: Hayashi Yuji , Nishizawa Mugio , Sakan Takeo
Published: July 2006

The short step synthesis of hypacrone [1] was completed by the condensation of cyclopentenone [4] (C8 unit) with 1,1-diacetylcyclopropane [6] (C7 unit), confirming the unique seco-illudane structure of this compound.
A STUDY OF COBALT COMPLEXES BY X-RAY PHOTOELECTRON SPECTROSCOPY
Authors: Haraguchi Hiroki , Fujiwara Kitao , Fuwa Keiichiro
Published: July 2006

Cobalt(II and III) complexes including Vitamin B12 have been investigated by X-ray photoelectron spectroscopy. Cobalt(II) and cobalt (III) complexes show the 2p1⁄2–2p3⁄2 peak separation of 16.0±0.3 eV and 15.1±0.3 eV, respectively. The data of the binding energies for Co 2p1⁄2, Co 2p3⁄2, N ls and S 2p in cobalt complexes are also presented.
HALOGENOBENZOQUINOPHTHALONE AS A NEW PIGMENT TO REPLACE CADMIUM YELLOW. Part II.
Authors: Matsuoka Masaru , Oda Hironori , Kitao Teijiro
Published: July 2006

5,6,7,8-Tetrabromo-3′-hydroxybenzo[b]quinophthalone has been developed as a new pigment to replace cadmium yellow. This compound is very similar to cadmium yellow in color and has excellent pigment properties. The effects of bromo substituent of benzoquinophthalones on thermal behavior and on solubility are also discussed.
13C NMR SPECTRA AND BONDING SITUATION OF THE B–C BOND IN ALKYNYLBORANES
Authors: Yamamoto Yoshinori , Moritani Ichiro
Published: July 2006

13C NMR spectra of boron substituted alkynes reveal that the β-carbon is deshielded by ca. 21 ppm by a B(O-n-C4H9)2 group. This clearly indicates the presence of a B–C π-bonding in alkynylboranes.
THE SYNTHESIS OF 2-HYDROXY-3H-CYCLOHEPT[a]AZULEN-3-ONE (AZULENO[2,1-d]TROPOLONE) AND ITS METHYL ETHERS
Authors: Saito Motoyasu , Morita Tadayoshi , Takase Kahei
Published: July 2006

2-Hydroxy-3H-cyclohept[a]azulen-3-one (azuleno[2,1-d]tropolone) (2) was synthesized, starting from 1,2-diformylazulene (3). Methylation of 2 yielded two kinds of methyl ethers (4 and 6), differing from benzotropolones. In trifluoroacetic or dil. sulfuric acid, 2, 4 and 6 exist in cyclohept[a]azulenylium ions (2a, 4a and 6a).
THE HEAVY ATOM EFFECT ON THE PHOTOCHEMICAL REDUCTION AND ADDITION OF N-ACETYLDIPHENYLKETIMINE WITH TOLUENE: EVIDENCE FOR THE MECHANISM THROUGH THE EXCITED IMINE OTHER THAN THE CHEMICAL SENSITIZATION MECHANISM
Authors: Toshima Naoki , Asao Shuichiro , Hirai Hidefumi
Published: July 2006

The photoreaction of N-acetyldiphenylketimine (l) with toluene was promoted by various kinds of halogenated solvents. This phenomenon was confirmed as an external heavy atom effect. The presence of this effect shows evidence that the excited state of the imine 1 has an ability to abstract a hydrogen atom.
THE HYDROLYSIS OF P-NITROPHENYL ACETATE BY A MICELLAR BIFUNCTIONAL CATALYST
Authors: Kunitake Toyoki , Okahata Yoshio , Sakamoto Tetsuo
Published: July 2006

A surfactant molecule which contains the hydroxamic acid and imidazole groups was synthesized and its catalytic efficiency in the hydrolysis of p-nitrophenyl acetate was examined in a mixed micelle with CTAB. The presence of the complementary functions in cationic micelles led to much enhanced catalytic efficiency compared with micellar, monofunctional systems.
A NOVEL RING CLEAVAGE OF 2,4,6-CYCLOOCTATRIEN-1-ONE
Authors: Ogawa Masashi , Matsuda Tsutomu
Published: July 2006

Piperidine reacts with 2,4,6-cyclooctatrien-1-one(1) to give 8-piperidino-3,5,7-octatrien-2-one and acetophenone. When pyrrolidine and morpholine were used the corresponding 8-amino ketones were produced. Deuterium insertion study of 1 with N-deuteriopiperidine suggests that in DMSO the ring cleavage proceeds by initial addition of piperidine at the C(7) and C(2) carbons (2,7-addition) followed by subsequent fission of C(7)–C(8) bond of 1.
ON THE PROPERTY OF DIBENZO[d,j]-6,8-BISDEHYDRO[13]ANNULENONE
Authors: Ojima Juro , Yokoyama Yoji , Yokoyama Tai
Published: July 2006

An annelated[13]annulenone (3) and its precursor (1) were converted into the corresponding alcohols (4) and (2), respectively. Comparison of the NMR spectrum of the alcohol (2) with that of (4) suggested that (3) is weakly paratropic.
A NOVEL TYPE OF POLYMER-EFFECT DUE TO A RIGID ROD-SHAPED CHAIN. THERMAL DEPOLYMERIZATION BEHAVIOR OF POLY-2,5-DISTYRYLPYRAZINE
Authors: Hasegawa Masaki , Nakanishi Hachiro , Yurugi Tadashi
Published: July 2006

A novel type of polymer-effect due to a rigid rod-shaped chain, was observed. On the thermal depolymerization of poly-2,5-distyrylpyrazine at 290°C, a high molecular weight polymer crystal is much less stable than the same of low molecular weight. This is the first example of chemical reaction that the breakage of chemical bond is dependent on the molecular length.
A NEW ROUTE TO NEZUKONE
Authors: Hayakawa Yoshihiro , Sakai Michiko , Noyori Ryoji
Published: July 2006

A simple synthesis of nezukone based on the iron carbonyl-promoted coupling between α,α,α′,α′-tetrabromoacetone and 3-isopropylfuran is described.
13C-NMR SPECTRA AND BONDING SITUATION IN KETENIMINES
Authors: Firl Joachim , Runge Wolfgang , Hartmann Werner , Utikal Hans-Peter
Published: July 2006

13C-NMR spectra of a series of substituted ketenimines are reported. The terminal carbon resonances are found at unusual high fields between δ 37 and 78, while the central carbon signals appear around δ 189–196. On the basis of these results, the bonding situation in ketenimines has been discussed.
27Al–13C SPIN COUPLING CONSTANT IN LITHIUM TETRAMETHYLALUMINATE
Authors: Yamamoto Osamu
Published: July 2006

27Al–13C and 13C–1H spin coupling constants in LiAl(CH3)4 were obtained from the 13C NMR spectra, and found to be 71.5±0.5 Hz and 106.5±1.0 Hz, respectively. A brief discussion was made on the coupling constants obtained.
THE STEREOSELECTIVE SYNTHESIS OF C18-JUVENILE HORMONE ANALOGUE
Authors: Mukaiyama Teruaki , Toda Haruhiko , Kobayashi Susumu
Published: July 2006

The new method for the stereoselective preparation of 1,5-diene units was successfully applied to the synthesis of C18-juvenile hormone analogue 16 of high biological activity.
BROMINE ABSTRACTION BY ARYL RADICALS FROM SUBSTITUTED BENZYL BROMIDES
Authors: Migita Toshihiko , Nagai Tomoko , Abe Yoichi
Published: July 2006

The relative reactivities of substituted benzyl bromides toward bromine abstraction by substituted phenyl radicals were determined at 60°C. The nature and the extent of polar and conjugative effects were found to depend on the substituents on the radicals.
SYNTHESIS OF ERIOSTOIC ACID AND ERIOSTEMOIC ACID
Authors: Nakayama Mitsuru , Hayashi Shûichi , Tsukayama Masao , Horie Tokunaru , Masumura Mitsuo
Published: July 2006

A linear-type carboxyethyl pyronochromanone derivative (V), after being converted into methyl ester-methyl ether (VI), was reduced with sodium borohydride to give methyl eriostate (VII). Hydrolysis of the ester (VII) with alkari afforded eriostoic acid (I). Eriostemoic acid (II) was also synthesized from an angular-type pyronochromanone derivative (IV) in a similar manner.
SUBSTITUENT EFFECT ON RIBONUCLEASE T1-CATALYZED TRANSPHOSPHORYLATION OF para-SUBSTITUTED BENZYL ESTERS OF GUANOSINE 3′-PHOSPHATE
Authors: Satoh Kimihiko , Inoue Yasuo
Published: July 2006

The maximal velocities have been measured for the ribonuclease T1- catalyzed transphosphorylation of a series of substrates named in the title. Based on the present results together with other relevant data, it is concluded that the catalysis involves nucleophilic component as well as electrophilic character, and the breakdown of a pentacovalent intermediate is not rate-limiting. We have proposed a possible mechanism most pertinent to a description of the ribonuclease T1 action.
ESR LINE-SHAPE EFFECTS IN THE PRESENCE OF SECOND-ORDER SPLITTINGS OBSERVED FOR 4,4′-DIFLUOROBIPHENYL CATION
Authors: Nemoto Fujito , Shimoda Fumio , Ishizu Kazuhiko
Published: July 2006

ESR spectra of 4,4′-difluorobiphenyl cation in solution show resolved second-order splittings and marked line-broadening attributable to the modulation of tumbling motion of the 19F anisotropic hyperfine interactions. This dipolar broadening is mainly observed for the line associated with the triplet state of the two equivalent 19F nuclei and at −90°C, only the singlet line is readily detectable.
THE REACTION OF ENOL ETHERS WITH ALDEHYDES PROMOTED BY TITANIUM TETRAISOPROPOXIDE AND TITANIUM TETRACHLORIDE
Authors: Kitazawa Eiichi , Imamura Tetsuo , Saigo Kazuhiko , Mukaiyama Teruaki
Published: July 2006

The equimolar reactions of enol ethers with various aldehydes in the coexistence of Ti(OPr-i)4 and TiCl4 afford 3-isopropoxy acetals or α,β -unsaturated carbonyl compounds in good yields under mild conditions.
SYNTHESIS OF EVONINE FROM EVONINIC ACID AND AN EVONINOL DERIVATIVE
Authors: Sugiura Kimio , Yamada Kiyoyuki , Hirata Yoshimasa
Published: July 2006

The 14-membered bislactone ring was constructed starting from dimethyl evoninate (1) and the evoninol derivative (6), leading to the synthesis of evonine (13).
FLUORESCENCE QUENCHING PROCESSES OF CARBAZOLE-AMINE SYSTEMS AS REVEALED BY LASER PHOTOLYSIS METHOD
Authors: Masuhara Hiroshi , Tohgo Yuichi , Mataga Noboru
Published: July 2006

The fluorescence quenching mechanisms of carbazole in acetonitrile were studied in detail by the laser photolysis method. Proton transfer and hydrogen atom transfer in the excited state were observed in the case of the triethylamine quencher, while ionic photodissociation due to electron transfer was confirmed in the case of the N,N-dimethylaniline quencher. However, no transient was detected in the case of the quenching by pyridine.
THE ELECTRON TRANSFER REACTION BETWEEN WURSTER’S BLUE CATION AND N,N-DIMETHYL-P-PHENYLENEDIAMINE IN AQUEOUS SOLUTION
Authors: Yamagishi Akihiko
Published: July 2006

The electron transfer reaction between Wurster’s Blue cation (TMPD\underset.+) and N,N-dimethyl-p-phenylenediamine (DMPD) in aqueous solution is investigated by the temperature-jump method. The forward and backward rate constants of TMPD\underset.+ + DKPD \ightleftharpoons TMPD + DMPD\underset.+ are determined to be (4.2±2)×106 and (1.5±0.5)×108 M−1 s−1 at 10±2°C, respectively.
ELECTROCHEMICAL OXIDATION OF LITHIUM ESTER ENOLATES
Authors: Tokuda Masao , Shigei Tetsuro , Itoh Mitsuomi
Published: July 2006

Electrochemical oxidation of lithium enolates of esters containing no activating groups at low temperature produced the corresponding substituted succinate esters in fairly good yields Electrolysis of enolate of ethyl phenylacetate also produced a quantitative yield of the oxidative dimer with 100% current efficiency.
A NEW SYNTHESIS AND THERMAL REARRANGEMENT OF 3,4-BENZOBICYCLO[4.2.0]OCTA-3,7-DIENE-2,5-DIONE
Authors: Oda Masaji , Miyazaki Hideo , Kayama Yasutaka , Kitahara Yoshio
Published: July 2006

Title compound (3) was prepared by a new method from bicyclo[4.2.0]octa-3,7-diene-2,5-dione through Diels-Alder reaction with butadiene, bromination with NBS, and then dehydrobromination with triethylamine. Thermolysis of (3) at 500°C gave, unexpectedly, 5-hydroxyacenaphthenone by a novel rearrangement. The intermediacy of 2,3-benzocyclooctatriene-1,4-dione is proposed.
SPACE-CHARGE-LIMITED CURRENTS IN POLY-N-VINYLCARBAZOLE FILMS
Authors: Kato Keishi , Fujimoto Tadaaki , Kodera Hideaki , Mikawa Hiroshi
Published: July 2006

The space-charge-limited currents in poly-N-vinylcarbazole films were investigated with the use of electrolytic solutions such as Ag2+ in 7.5N HNO3, NaI solution saturated with iodine, and Ce4+ in 15N H2SO4. These oxidizing solutions are suitable hole-injecting electrodes. The current-voltage characteristic indicates the existence of exponentially-distributed traps, the concentration of which is about 5×1018cm−3.
THE OXIDATION OF ALCOHOLS TO CARBONYL COMPOUNDS VIA ALKOXYMAGNESIUM BROMIDES
Authors: Mukaiyama Teruaki , Tsunoda Masaru , Saigo Kazuhiko
Published: July 2006

Alkoxymagnesium bromides prepared from alcohols and ethylmagnesium bromide are oxidized with N-chlorosuccinimide in the presence of lithium tert-butoxide to afford the corresponding carbonyl compounds in good yields.
MOLECULAR CONFORMATIONS AND C–Cl STRETCHING VIBRATIONS OF 1-CHLORO-2-METHYLPROPANE AND C–S STRETCHING VIBRATIONS OF 2-METHYL-1-PROPANETHIOL AND l-CYSTEINE
Authors: Ozaki Yukihiro , Sugeta Hiromu , Miyazawa Tatsuo
Published: July 2006

The Raman spectra of 1-chloro-2-methylpropane and 2-methyl-1-propanethiol were measured in the liquid and solid states. Conformations of these molecules were studied in relation with the characteristic CH2–Cl and CH2–S stretching vibrations. The molecular structure of l-cysteine was discussed on the basis of observed CH2–S stretching frequencies.
THE USE OF VINYLENE HOMOLOG OF MIXED ANHYDRIDE FOR THE CARBOXYL-ACTIVATION. A NEW SYNTHESIS OF PEPTIDES
Authors: Saito Tomoo
Published: July 2006

Several dimedone enol esters of N-benzyloxycarbonylamino acids have been prepared in excellent yields. It has also been indicated that the esters accounted as a vinylene homolog of mixed anhydride were easily aminolyzed by free amino esters or amino acids to give the corresponding dipeptides.
THE SYNTHESIS OF 6-METHYLEN-2(6H)-AZULENONE (2,6-AZULENOQUINONE 6-METHIDE) DERIVATIVES
Authors: Kosuge Shunji , Morita Tadayoshi , Takase Kahei
Published: July 2006

6-Methylen-2(6H)-azulenone (2,6-azulenoquinone 6-methide) derivatives (3a,b) were synthesized and shown to be so reactive that they could be isolated only in a form of dimers (4a,b).
SOME REPRESENTATIVE CYCLOADDITIONS OF VINYLCYCLOPROPANE. AN EVIDENCE FOR THE TWO-STEP PROCESS IN THE DONOR-ACCEPTOR TYPE CYCLOADDITION
Authors: Shimizu Nobujiro , Ishizuka Shin-ichi , Tsuji Takashi , Nishida Shinya
Published: July 2006

Reaction of 1,1-diphenyl-2-vinylcyclopropane with 2,3,4,5-tetrachlorocyclopentadienone ethylene ketal proceeded smoothly to give a diene adduct quantitatively, whereas its reaction with tetracyanoethylene gave unexpected adducts after rearrangements. These results evidence that the latter donor-acceptor type cycloaddition proceeds via a zwitterionic intermediate.
CYCLOADDITIONS DE NITRONES ET D’UNE NITRILIMINE SUR LA DIPHENYLCYCLOPROPENONE
Authors: Matsukubo Hiroshi , Kato Hiroshi
Published: July 2006

The reaction of diphenylcyclopropenone (1) with C-aryl-N-phenylnitrone gave 2-anilino-5-aryl-2,4-diphenyl-3(2H)-furanone (3) accompanied by an oxygenated by-product. The reaction of (1) with diphenylnitrilimine afforded mesoionic tetraphenylpyridazin-4-one (8).
HYDROTHERMAL GROWTH OF ANATASE (TiO2) CRYSTALS
Authors: Izumi Fujio , Fujiki Yoshinori
Published: July 2006

Anatase crystals were grown hydrothermally using KF–K2HPO4 solutions. Only rutile was formed in KF solution, whereas the addition of K2HPO4 was effective in crystallizing anatase over a wide range of temperature and pressure. Some properties and the morphological features of the synthetic anatase are described.
AN EVIDENCE FOR SINGLET GROUND STATE OF 1,6-DI-t-BUTYL-3,4,8,9-TETRAPHENYLTRICYCLO[6.2.0.02,5]DECA-1,3,5,7,9-PENTAENE
Authors: Toda Fumio , Mukai Kazuo
Published: July 2006

Ground state of the title compound (1) was shown to be singlet by means of its ESR spectrum and magnetic susceptibility.
RAMAN SPECTRUM OF TEREPHTHAL-BIS-BUTYLANILINE IN THE LIQUID CRYSTALLINE STATES
Authors: Takase Akira , Akagami Sakumitsu , Nakamizo Minoru
Published: July 2006

Raman spectra of the smectic H phase and two unidentified phases of terephthal-bis-butylaniline are studied in the 0–400cm−1 region. Observation of the Raman peaks due to lattice vibrations suggests that the latter two phases are closer to the crystalline solid phase rather than the smectic H phase.
SYNTHESIS AND PROPERTIES OF THE METALLIC MOLYBDATE(IV) CaMoO3
Authors: Kamata Kiichiro , Nakamura Tetsuro , Sata Toshiyuki
Published: July 2006

Polycrystalline CaMoO3 was prepared by a new method making use of the oxygen stability range, and revealed to have an orthorhombic lattice (a=5.448Å, b=7.776Å, c=5.582Å), metallic conduction and Pauli paramagnetism. The results indicate that 4d2 electrons of Mo4+ are delocalized in CaMoO3 as same as those in BaMoO3 and SrMoO3.
A FACILE SYNTHESIS OF UNSYMMETRICAL DISULFIDES
Authors: Endo Tadashi , Tasai Hidetoshi , Ishigami Tatsuzo
Published: July 2006

Unsymmetrical disulfides were readily prepared in high yields by successive treatment of silver thiolates initially with 2,4-dinitrobenzenesulfenyl chloride in acetonitrile at 0 °C and then with the second thiols and silver acetate in DMF at room temperature.
A NOVEL POLYMER–RHODIUM COMPLEX AS HYDROGENATION CATALYST OF ALKENES
Authors: Nakamura Yoshio , Hirai Hidefumi
Published: July 2006

A polymer–rhodium complex prepared from rhodium(III) chloride and styrene-divinylbenzene copolymer with iminodiacetic acid groups is found to catalyze the heterogeneous hydrogenation of alkenes in polar solvents at 30°C under an atmospheric hydrogen pressure. The polymer complex hydrogenates selectively the ethylenic double bonds in the alkenes with carbonyl and aromatic groups. The rates of hydrogenation of alkenes by the polymer complex are found to be markedly affected by the steric hindrance of the substrates.
HETEROGENEOUS TRIPLET-TRIPLET ANNIHILATION IN POLY-N-VINYLCARBAZOLE FILMS DOPED WITH NAPHTHALENE AND FLUORENE
Authors: Itaya Akira , Okamoto Ken-ichi , Kusabayashi Shigekazu
Published: July 2006

The triplet energy transfer in poly-N-vinylcarbazole (PVCz) films has been investigated by measuring the delayed emission spectra at 77 K. By doping of a triplet quencher such as naphthalene and fluorene, the PVCz phosphorescence decreased significantly and was replaced by the sensitized dopant phosphorescence. On the contrary, the PVCz delayed fluorescence rather increased with increasing concentration of triplet quenchers. This phenomenon suggests the presence of a heterogeneous triplet–triplet annihilation in PVCz films.
NOVEL ISOMERIZATION AND RETRO-MANNICH REACTION OF 1,1,2,2-TETRAACYLCYCLOPROPANES
Authors: Ohkata Katsuo , Kubo Yasuo , Tamaru Akira , Hanafusa Terukiyo
Published: July 2006

1,1,2,2-Tetraacylcyclopropanes (1a, 1b) were rearranged into nine-membered enol lactones (2a, 2b) by tertiary amines, while primary arylamines brought about retro-Mannich reaction to give bisdimedone (4) and Schiff base.
NOVEL CAGE-SHAPED COMPOUNDS FROM REDUCTION OF r-2,3-EPOXY-2,3,4,c-4a,5,8,c-8a-HEXAHYDRO-c-5,8-ISOBUTYLIDENE-1,4-NAPHTHOQUINONES
Authors: Ichihara Akitami , Kaibuchi Hideo , Kobayashi Makio , Oda Kengo , Sakamura Sadao , Furusaki Akio , Matsumoto Takeshi
Published: July 2006

Novel cage-shaped compounds were obtained by the reduction of r-2,3-epoxy-2,3,4,c-4a,5,8,c-8a-hexahydro-c-5,8-isobutylidene-1,4-naphthoquinones (1) and assigned the structure 2 on the basis of the spectral data and X-ray crystallography. The compounds have an oxygen-containing strained cage structure hitherto unknown.
CORRELATIONS BETWEEN LONG-RANGE COUPLINGS IN ELECTRON SPIN RESONANCE AND NUCLEAR MAGNETIC RESONANCE
Authors: Kawamura Takashi , Matsunaga Masaji , Yonezawa Teijiro
Published: July 2006

Correlations between coupling constants in electron spin resonance and nuclear magnetic resonance are examined. Plots of proton hyper-fine splitting constants of HR· against the corresponding proton–proton coupling constants of the parent hydrocarbons HRH are shown to fit one curve.
PHOTOLYSIS OF 1-NITROPROPANE IN GAS PHASE
Authors: Khan Khurshid A
Published: July 2006

Primary processes in photolysis of 1-nitropropane in gas phase are analogous to those of nitroethane and 2-nitropropane. Ethylene, propylene and methyl nitrite are the major photolysis products,while minor products are methane, methyl nitrate, ethylene oxide, ethyl nitrite, propyl nitrite, formaldehyde, propionaldehyde, water, nitric oxide and nitrogen dioxide. Quantum yields of formation of photoproducts ethylene and propylene at 22°C are 0.074 and 0.042; and at 56°C these are 0.039 and 0.01. A mechanism of the photolysis is suggested.
A NOVEL DECARBOXYLATIVE CONDENSATION OF β-KETO ACIDS WITH 2-CYCLOHEXEN-1-ONE
Authors: Yasuda Michiko
Published: July 2006

In the presence of aniline catalyst, acetoacetic acid(I) reacted smoothly with 2-cyclohexen-1-one(II) to give 3-acetonylcyclohexan-1-one(III) at room temperature, with evolution of carbon dioxide. Similarly the reaction between 2-oxocyclohexane-1-carboxylic acid(IV) and II gave the analogous decarboxylative condensation product, bicyclohexyl-2,3′-dione(V).
SYNTHETIC STUDIES OF LAURENCIN AND RELATED COMPOUNDS. II THE SYNTHESIS OF CIS-2-ETHYL-8-FORMYL-7,8-DIHYDRO-2H-OXOCIN-3(4H)-ONE 3-ETHYLENE ACETAL
Authors: Masamune Tadashi , Matsue Hajime
Published: July 2006

The synthesis of the titled hydrooxocinone (2) is described. Hydride reduction of a mixture of methyl 5-ethyl-2,5-dihydro-2-furoates (3) followed by ozonization afforded a dialdehyde mixture, which was submitted to the Robinson-Schöpf condensation to give, after acetylation, three 9-aza-3-oxabicyclo[3. 3 .1]nonanones (5 ∼ 7). cis-Bicyclononanone (5) was further transformed by a modification of the Paquette procedure (5 → 8 → 9 → 10a → 11) to give cis-2-ethyl-8-hydroxymethyl-7, 8-dihydro-2H oxocin-3 (4H)-one (11), which was converted smoothly into the aldehyde (2), one of the most important intermediates for synthesis of laurencin (1).
OXIDATION OF IRON IN NITRIC OXIDE
Authors: Takasu Yoshio , Maru Shun-ichi , Matsuda Yoshiharu
Published: July 2006

Oxidation of iron plates in nitric oxide was examined. The oxidation rate was higher than that in oxygen in a certain temperature range, 450–580°C, however, it had a minimum at 550°C in regard to its temperature dependencies. The scales formed in nitric oxide was found to be consisted of only Fe3O4.
FIVE NEW ALKALOIDS FROM DAPHNIPHYLLUM GRACILE GAGE
Authors: Yamamura Shosuke , Lamberton J A , Irikawa Hajime , Okumura Yasuaki , Hirata Yoshimasa
Published: July 2006

Five new alkaloids have been isolated from the plant Daphniphyllum gracile Gage, and their structures also been elucidated on the basis of their spectral and chemical evidences. Particularly, daphnigraciline methiodide (VI) was directly converted into yuzurine methiodide (VII). Furthermore, application of 13C NMR spectra plays an important role in the structural elucidation.
THE REGIOSELECTIVE SYNTHESIS OF 2-BUTEN-4-OLIDES
Authors: Bennett G
Published: July 2006

Various 3,4,4-trisubstituted-2-buten-4-olides were prepared by the condensation of 2-alkyn-1,4-diols with triethyl orthoacetate in the presence of a catalytic amount of pivalic acid.
HYDROGENATION OF α,β-UNSATURATED ALDEHYDE TO UNSATURATED ALCOHOL CATALYZED BY RHODIUM COMPLEX
Authors: Meguro Shun-ichi , Mizoroki Tsutomu , Ozaki Atsumu
Published: July 2006

α-Methyl-cinnamaldehyde, cinnamaldehyde, and croton aldehyde are hydrogenated to the corresponding unsaturated alcohols with a fairly high selectivity by use of RhCl3·3H2O or Rh2(CO)4Cl2 catalyst in tertiary amine-benzene solution under an oxo-reaction condition. A catalytic amount of triphenylphosphine to this catalyst system substantially retards the hydrogenation of –CHO giving saturated aldehyde.
THE ANOMALOUS ELECTRO-OPTIC EFFECT IN THE NEMATIC STATE OF 4-PENTYLOXYBENZYLIDENE-4-HEPTYLANILINE
Authors: Sakagami Sakumitsu , Takase Akira , Nakamizo Minoru
Published: July 2006

The electro-optic behavior in the nematic state of 4-pentyloxy-benzylidene-4-heptylaniline(PBHA) is observed under the application of external DC electric field. The domain patterns can be observed only at several degrees below the isotropic-nematic transition temperature.
PALLADIUM(0) CATALYSED SYNTHESES OF KETONES FROM ACYL HALIDES AND ORGANOMERCURY(II) COMPOUNDS
Authors: Takagi Kentaro , Okamoto Tadashi , Sakakibara Yasumasa , Ohno Atsuyoshi , Oka Shinzaburo , Hayama Naomi
Published: July 2006

Convenient syntheses of various ketones from acyl halides and organomercury(II) compounds have been achieved by the aid of catalytic amounts of tetrakis(triphenylphosphine)palladium in hexamethylphosphoric triamide. Plausible reaction path is proposed.
CONFORMATIONAL ANALYSIS OF QUATERNARY PROTOBERBERINE ALKALOIDS BY CARBON-13 NMR SPECTROSCOPY
Authors: Yoshikawa Ken-ichi , Morishima Isao , Kunitomo Jun-ichi , Ju-Ichi Motoharu , Yoshida Yukari
Published: July 2006

Carbon-13 NMR spectra of quaternary protoberberine alkaloids were measured and their preferential conformation was concluded by comparison of the chemical shift.
SELECTIVE ASYMMETRIC REDUCTION OF α,β-UNSATURATED KETONES VIA HYDROSILYLATION CATALYZED BY RHODIUM(I) COMPLEXES WITH CHIRAL PHOSPHINE LIGANDS
Authors: Ojima Iwao , Kogure Tetsuo , Nagai Yoichiro
Published: July 2006

Selective asymmetric reductions of carbonyl functionalities in α,β-unsaturated carbonyl compounds, such as β-ionone, 2-methylcyclohexenone and mesityl oxide, were successfully carried out using dihydrosilane-chiral rhodium(I) complex catalyst combinations.
LIQUID PHASE CATALYTIC OXIDATION OF NITRIC OXIDE WITH NITRIC ACID
Authors: Osa Tetsuo , Fujieda Shigeaki , Abe Yasuhiko
Published: July 2006

Catalytic oxidation of nitric oxide with nitric acid was carried out in the presence of various metal salts. Copper, iron, cobalt and nickel ions had catalytic activity. The influences of temperature and contact time were examined. The possibility of the application to the pretreatment for the removal of nitrogen oxides was discussed.
CATALYTIC PROPERTIES OF A Cu(II) COMPLEX WITH A MODIFIED CYCLODEXTRIN
Authors: Matsui Yoshihisa , Yokoi Toshio , Mochida Kazuo
Published: July 2006

A 1:2 complex between Cu(II) and mono-(6-β-aminoethylamino-6-deoxy)-β-cyclodextrin significantly accelerates the oxidation of furoin at pH 10.5. The existence of two cyclodextrin cavities in the complex molecule may contribute to the remarkable rate acceleration.
SYNTHETIC CONTROL BASED ON 2-HALOPYRIDINIUM SALTS I. THE PREPARATION OF (R)- AND (S)-2-CHLORO-1-(1-CYCLOHEXYLETHYL)-3-ETHYL-6-METHYLPYRIDINIUM FLUOROBORATE
Authors: Shiono Manzo , Shibanuma Tadao , Mukaiyama Teruaki
Published: July 2006

Optically active (R)- and (S)-2-chloro-1-(1-cyclohexylethyl)-3-ethyl-6-methylpyridinium fluoroborate were prepared by a new and versatile method.
PHOTOCHEMICAL REARRANGEMENT OF 1-METHOXYTRIPTYCENE. AN EFFICIENT RADICAL FRAGMENTATION OF A METHOXYCARBENE
Authors: Iwamura Hiizu , Tukada Hideyuki
Published: July 2006

Irradiation of 1-methoxytriptycene 1(X = OCH3) in alcohols gives 2-(9-fluorenyl)benzaldehyde acetals 3 in good yield, showing the formation of 2-(9-fluorenyl)phenylmethoxycarbene 2(X = OCH3). In cyclohexane the expected internal adduct 4 is not obtained, but the photoproduct is 2-(9-fluorenyl)benzaldehyde 5. A novel homolysis of the O–CH3 bond in less electrophilic methoxycarbene 2 has been demonstrated.
ISOLATION OF ENAMMONIUM SALT AND ITS REARRANGEMENT TO THE CORRESPONDING IMINIUM SALT
Authors: Matsushita Hajime , Tsujino Yasuko , Noguchi Masao , Yoshikawa Sadao
Published: July 2006

1-(β-Methylstyryl)-2-methylpiperidinium chloride was isolated and characterized. This is the first case of the isolation of the enammonium salt. The enammonium salt was found to change easily to the corresponding iminium salt at room temperature.
A GENERAL SYNTHESIS OF α,β-UNSATURATED α-AMINO ACID ETHYL ESTERS
Authors: Shin Chung-gi , Yonezawa Yasuchika , Yoshimura Juji
Published: July 2006

The general synthesis of ethyl 2-amino-2-alkenoate by reduction of ethyl 2-azido-2-alkenoate, derived from ethyl 2-alkenoate by four steps, with aluminum-amalgam is described.