bluuebunny/crossref_metadata_2025 huggingface dataset:
A NEW METABOLITE, ASPERMUTARUBROL, FROM ASPERGILLUS SYDOWI
Authors: Shibata Kozo , Kamikawa Tadao , Kaneda Norimasa , Taniguchi Makoto
Published: July 2006

A new phenolic metabolite, aspermutarubrol, was isolated from Aspergillus sydowi and bis(5-methyl-2,3-dihydroxyphenyl) ether was assigned to this substance from the spectroscopic evidence and the synthesis of its tetramethyl ether.
SYNTHESIS AND PHOTOISOMERIZATION OF “MINI-β-CAROTENES”
Authors: Gapski George , Kini Aravinda , Liu R S H
Published: July 2006

The trans triene obtained from coupling of cyclocitral can be converted photochemically, quantitatively to the hindered cis isomer. But, the two isomers of the pentaene obtained from coupling of β-ionone were found to interconvert under selective sensitization but not to give the hindered 7-cis isomers.
NOVEL MIGRATION OF METHYL GROUP OF 6,10,10-TRIMETHYL-4-OXOTRICYCLO[4.4.0.01,3]DECANE WITH BORON TRIFLUORIDE IN ACETIC ACID-ACETIC ANHYDRIDE
Authors: Sekizaki Haruo , Ito Masaaki , Inoue Shoji
Published: July 2006

6,10,10-Trimethyl-4-oxotricyclo [4.4.0.01,3] decane 1 undergoes migration of one of the gem-dimethyl group on treatment with boron trifluoride in acetic acid-acetic anhydride giving the acetates (2) and (3).
CO-PYROLYSIS OF 1,2-DICHLOROPROPANE AND METHANOL ON ACTIVATED ALUMINA
Authors: Shinoda Kiyonori
Published: July 2006

The co-pyrolysis of 1,2-dichloropropane (DCP) and methanol on activated alumina was carried out at 270°C. The reaction products contained a significant amount of oxygen-containing compounds as well as the ordinary pyrolysis compounds. The formation of acetone and acrolein increased as a function of the time factor.
QUANTITATIVE OZONE-OXIDATION OF TRYPTOPHAN TO N′-FORMYLKYNURENINE AND KYNURENINE
Authors: Sakiyama Fumio , Masuda Nobuhito , Nakazawa Takashi , Katsuragi Yasuhiro
Published: July 2006

Tryptophan was quantitatively oxidized to kynurenine or N′-formylkynurenine on methanolic ozonization and subsequent reduction of the ozonization product, which was identified as N′-methoxyhydroperoxymethylkynurenine by carbon-13 NMR spectroscopy. With dimethyisulfide this peroxidic intermediate was usually reduced to N′-formylkynurenine, but in the acidic condition it was converted to kynurenine.
A CONVENIENT PROCEDURE FOR THE TRANSFORMATION OF ALCOHOLS TO OLEFINS AND ALKYL CHLORIDES
Authors: Liu Hsing-Jang , Chan Wing Hong , Lee Sing Ping
Published: July 2006

Treatment of 1° alcohols with N,N-dimethylphosphoramidic dichloride in refluxing 1,2-dimethoxyethane gave the corresponding chlorides. Upon similar treatment, 3° alcohols underwent dehydration giving olefinic products, whereas 2° alcohols afforded olefins or chlorides as predominant products.
QUENCHING OF THE BENZENE FLUORESCENCE BY PYRIMIDINE IN CYCLOHEXANE
Authors: Tsukada Masao , Omura Itaru
Published: July 2006

Studies were made on the quenching of the benzene fluorescence excited with 254 nm radiation by pyrimidine in cyclohexane. The value of quenching constant is larger by a factor of 7 than that expected for diffusion-controlled process.
[2 + 2] CYCLODIMERIZATION OF N-VINYLCARBAZOLE IN ACETONE UNDER THE CONDITION OF SINGLET OXYGEN REACTION
Authors: Nishimoto Sei-ichi , Kagiya Tsutomu
Published: July 2006

In the presence of singlet molecular oxygen generated by means of the microwave discharge or the decomposition of triphenyl phosphite ozonide, N-vinylcarbazole was converted to trans-1,2-dicarbazylcyclobutane in good yields in acetone solution.
CIRCULAR DICHROISM AND STEREOCHEMISTRY OF OPTICALLY ACTIVE BIS(DIAMINE)DINITRITOCHROMIUM(III) COMPLEXES
Authors: Kaizaki Sumio , Shimura Yoichi
Published: July 2006

From the CD spectra in the region of an intraligand absorption band localized on nitrito ligands of Λ-cis-[Cr(ONO)2(en)2]ClO4, trans-[Cr(ONO)2(R-pn)2]ClO4, and trans-[Cr(ONO)2(R,R-ptn)2]ClO4, where R-pn and R,R-ptn are (R)-propylenediamine and (R,R)-2,4-pentanediamine, respectively, the chirality due to the rotational isomerism of the unidentate nitrito ligands has been substantiated and its stereochemical implications have been discussed.
ELECTROPHILIC SUBSTITUTION OF BENZENES WITH STRONG ELECTRON-WITHDRAWING GROUPS IN SUPER ACID MEDIA. FRIEDEL-CRAFTS ALKYLATION OF ACETOPHENONE
Authors: Yoneda Norihiko , Fukuhara Tsuyoshi , Takahashi Yukio , Suzuki Akira
Published: July 2006

In the presence of HF-SbF5 super acid, the alkylation of acetophenone with various alkyl chlorides was investigated. The products were found to be those of m-alkylated acetophenone derivatives and their related compounds in fairly good yields. The relative reactivity of alkyl chlorides was in the order of EtCl>n-, iso-PrCl, n-, s-BuCl>>iso-BuCl>>t-BuCl. The formation of olefinic, alcoholic, and condensation products observed in the reaction with propyl chlorides, and skeletal isomerization products obtained in the reaction with butyl chlorides was also discussed.
TOTAL SYNTHESIS OF METHYNOLIDE: SYNTHESIS OF TWO INTERMEDIATES, 3,4-DIACETOXY-3-METHYL-1-HEXYNE AND PRELOG-DJERASSI LACTONIC ACID
Authors: Nakano Akio , Takimoto Seiji , Inanaga Junji , Katsuki Tsutomu , Ouchida Shuichi , Inoue Kazutaka , Aiga Makoto , Okukado Nobuhisa , Yamaguchi Masaru
Published: July 2006

(+)-3,4-Diacetoxy-3-methyl-1-hexyne and (+)-Prelog-Djerassi lactonic acid were synthesized as the starting materials for the total synthesis of methynolide.
STEREOCHEMICAL FEATURES OF THE [2,3]SIGMATROPIC REARRANGEMENT OF DITHIOCARBENES
Authors: Nakai Takeshi , Mikami Koichi
Published: July 2006

The [2,3]sigmatropic rearrangement of dithiocarbenes has been demonstrated to proceed with high level of stereoselectivity favoring the trans geometry of the newly formed double bond and with low level of asymmetric induction across the convex face of cyclohexylidene ring system.
SOLID-STATE CIRCULAR DICHROISM SPECTRA OF COBALT(III) COMPLEXES MEASURED BY A NUJOL MULL METHOD
Authors: Taniguchi Yutaka , Shimura Yoichi
Published: July 2006

Circular dichroism spectra of cobalt(III) complexes in microcrystalline states were measured by a Nujol mull method. The principle of this method was briefly outlined. The reproducibility and features of the spectra obtained were discussed.
A NEW MACROCYCLIC SESTERTERPENE ACID FROM CEROPLASTES CERIFERUS
Authors: Kusumi Takenori , Kinoshita Takeshi , Fujita Ken-ichi , Kakisawa Hiroshi
Published: July 2006

From the wax of Ceroplastes ceriferus, a scale insect, a new macrocyclic sesterterpene, designated as ceriferic acid, was isolated, and its structure was elucidated as albocera-2(E),6(E),10(E),15(E),18-pentaen-25-oic acid.
THE STRUCTURES OF OHCHINOLIDE A AND B, TWO NEW LIMONOIDS FROM MELIA AZEDARACH LINN. VAR. JAPONICA MAKINO
Authors: Ochi Masamitsu , Kotsuki Hiyoshizo , Ido Mitsuhiro , Nakai Hiroshi , Shiro Motoo , Tokoroyama Takashi
Published: July 2006

Two new limonoids, ohchinolide A and B, have been isolated from the fruit of M. azedarach Linn. var. japonica Makino and their structures established to be 1 and 2 by spectral correlations and an X-ray diffraction method.
ANODIC CHARACTERISTICS OF Fe-SUPPORTED Co3O4 ELECTRODES IN ALKALINE SOLUTION
Authors: Honji Akio , Iwakura Chiaki , Tamura Hideo
Published: July 2006

Fe-supported Co3O4 electrodes were prepared by the thermal decomposition method and their anodic characteristics were studied in 1M KOH solution. As a result, it was found that the electrodes prepared at relatively low temperatures have very attractive properties as an anode for oxygen evolution.
NUCLEOSIDE 3′-PHOSPHOTRIESTERS AS KEY INTERMEDIATES FOR THE OLIGORIBONUCLEOTIDES SYNTHESIS VIA PHOSPHOTRIESTER APPROACH
Authors: Takaku Hiroshi , Nomoto Tadaaki , Sakamoto Yukimi , Hata Tsujiaki
Published: July 2006

5′-O-Dimethoxytrityl 2′-O-tetrahydropyranyl nucleoside 3′-(2-cyanoethyl, 5-chloro-8-quinolyl) phosphates (3) were obtained in good yields by treating 5′-O-dimethoxytrityl 2′-O-tetrahydropyranyl nucleosides (1) with 5-chloro-8-quinolyl phosphate and 8-quinolinesulfonyl chloride (QS) followed by addition of 2-cyanoethanol. The compound 3 is a key intermediate for the oligoribonucleotide synthesis by the improved triester method.
SYNTHESIS OF (−)-TAYLORIONE, A SESQUITERPENE KETONE OF ENT-1,10-SECO-AROMADENDRANE SKELETON
Authors: Nakayama Mitsuru , Ohira Susumu , Shinke Shuzo , Matsushita Yoichi , Matsuo Akihiko , Hayashi Shûichi
Published: July 2006

(−)-Taylorione, ent-1,10-seco-aromadendra-l(5),4(15)-dien-10-one, was synthesized from (+)-Δ3-carene via (−)-2-[3-(3-hydroxybutyl)-2,2-dimethylcyclopropyl]-2-cyclopenten-l-one as a key intermediate.
THE ADDITION REACTION OF METALATED 2-ALLYLOXYBENZIMIDAZOLES TO ALDEHYDES AND THE TRANSFORMATION OF THE ADDUCTS TO VINYLOXIRANES
Authors: Yamaguchi Masahiko , Mukaiyama Teruaki
Published: July 2006

Treatment of 2-allyloxybenzimidazoles with butyllithium followed by cadmium iodide generates the metalated allylic ethers, which in turn react with aldehydes to form adducts selectively at α-carbon of the allylic ethers. The adducts are converted to vinyloxiranes in good yields on treatment with sodium hydride.
VICINAL DEHYDROBROMINATION OF (α-BROMOVINYL)CHLOROSILANES WITH QUINOLINE. A NEW ROUTE TO ETHYNYLCHLOROSILANES
Authors: Matsumoto Hideyuki , Kato Takayuki , Matsubara Ikuya , Hoshino Yoshikazu , Nagai Yoichiro
Published: July 2006

(α-Bromovinyl)chlorosilanes of the type CH2=CBrSiRnCl3−n(R = Me, Et; n = 0, 1, 2) were found to be dehydrobrominated with quinoline yielding the corresponding ethynylchlorosilanes.
THE REACTION OF ARYL METHYL SULFIDES WITH ALKYL METHANESULFONATES. A KINETIC STUDY FOR THE SULFONIUM SALT FORMATION
Authors: Kozuka Seizi , Taniyasu Shigeru , Kikuchi Akihiko , Ogino Kenji
Published: July 2006

A kinetic study has been carried out for the reaction of aryl methyl sulfides with alkyl methanesulfonates giving sulfonium salts. Activation parameters, substituent and steric effects were examined.
PHOTOOXYGENATION OF FLAVANONOL-RED RELATED COMPOUNDS
Authors: Shibata Kozo , Ichikawa Nobutaka , Kubota Takashi
Published: July 2006

Photooxygenation of 6-phenyl-5,7-dioxa-benz[a]anthracene in ethanol followed by recrystallization from ethanol resulted in the formation of a diethoxy compound by unusual addition of two ethoxyl groups to a C–C double bond. While, recrystallization of the photooxygenation product from methanol afforded a monoethoxy monomethoxy compound.
AN EFFICIENT METHOD FOR THE SYNTHESIS OF PEPTIDES BY THE USE OF PHENYLPHOSPHONIC ESTERS
Authors: Mukaiyama Teruaki , Morito Naoya , Watanabe Yutaka
Published: July 2006

Treatment of the tetrabutylammonium salt of N-benzoyl-l-leucine and glycine ethyl ester with bis(o- or p-nitrophenyl) phenylphosphonate in DMF resulted in the formation of the corresponding dipeptide in excellent yield with high optical purity. Similarly, racemization-free Z-l-Phe-Gly-OEt was prepared in high yield.
HYDROLYSIS OF CARTHAMIN
Authors: Onodera Jun-ichi , Saito Takashi , Obara Heitaro
Published: July 2006

2,5-Bis(p-methoxycinnamoyl)-1,3,4,6,7,8-, and 2,7-bis(p-methoxycinnamoyl)-1,3,4,5,6,8- or 4,5-bis(p-methoxycinnamoyl)-1,2,3,6,7,8-hexamethoxyxanthen (8, and 9 or 10) were obtained by the methylation of the hydrolysis products of carthamin. The structure of 8 was confirmed by the direct comparison with a synthetic sample. The formation process of 8, and 9 or 10 is discussed.
METASTABLE MODIFICATION OF SrB2O4
Authors: Yamaguchi Osamu , Kamata Muneaki , Shimizu Kiyoshi
Published: July 2006

During the course of heating the amorphous material prepared by the simultaneous hydrolysis of strontium methoxide and boron triethoxide, a new modification of SrB2O4, being metastable, was formed.
REACTIONS OF ALLYL PHENYL AND DIALLYL ETHERS WITH Ni(cod)2 IN THE PRESENCE OF PHOSPHINE LIGANDS WITH AND WITHOUT C–O BOND CLEAVAGE. PREPARATION OF Ni(η3-C3H5)(OC6H5)(PPh3) BY THE OXIDATIVE ADDITION OF ALLYL PHENYL ETHER TO NICKEL AND PREPARATION OF Ni(π-DIALLYL ETHER)(PR3)
Authors: Yamamoto Takakazu , Ishizu Junichi , Yamamoto Akio
Published: July 2006

The reaction of allyl phenyl ether with a mixture of bis (1,5-cyclooctadiene)nickel and PPh3 leads to the oxidative addition of the ether involving the PhO–C bond cleavage to afford Ni(η3-C3H5)(OC6H5)(PPh3) 1. Similar reactions of diallyl ether with Ni(cod)2 in the presence of PR3 (R = C6H5, cyclo-C6H11) give uncleaved π-type complexes formulated as Ni(π-allyl ether)(PR3).
RESONANCE RAMAN SPECTRA OF CHLORANIL ANION RADICAL DIMERS
Authors: Matsuzaki Susumu , Mitsuishi Tetsuya , Etoh Chisumi , Toyoda Koichi
Published: July 2006

Two resonant lines were observed in the Raman spectra of chloranil anion radical dimers with exciting radiation close to the CT band, and were assigned to inter-radical stretching vibrations. The change of the relative intensity of these lines depending on counter ions was attributed to the formation of two different dimers.
INFRARED AND RAMAN INVESTIGATION OF THE STRUCTURAL BEHAVIOUR OF THE S2O3= ION IN CADMIUM THIOSULFATE DIHYDRATE, CdS2O3·2H2O (1)
Authors: Gabelica Zélimir
Published: July 2006

Solid state infrared and Raman spectra of cadmium thiosulfate dihydrate, CdS2O3·2H2O,have been examined. The splittings and the shifts of the internal frequencies of the coordinated S2O3 anions were found to characterize bridging thiosulfate groups binding two cadmium ions through the external sulfur atom.
CYCLOADDITION REACTION OF BENZOCYCLOPROPENE WITH AROMATIC NITRILE OXIDES: A SYNTHETIC ENTRY INTO A BRIDGED OXAZONINE
Authors: Nitta Makoto , Sogo Shoji , Nakayama Tadashi
Published: July 2006

9-Aryl-7-oxa-8-azatricyclo[4.3.1.0]deca-2,4,8-trienes (Ia and Ib) were synthesized by the cycloaddition reaction of benzocyclopropene with benzonitrile oxide and mesitonitrile oxide, respectively. The closed norcaradiene structures were preferable to the opened bridged oxazonine isomers in the range of 25–120°C.
SYNTHESIS OF ALKYL- OR ARYL-SUBSTITUTED HETELOCYCLES: NICKEL COMPLEX CATALYZED COUPLING REACTION OF HETEROCYCLIC SULFIDES AND THIOLS WITH GRIGNARD REAGENTS
Authors: Takei Hisashi , Miura Morikazu , Sugimura Hideyuki , Okamura Hisashi
Published: July 2006

Heterocyclic sulfides and thiols react with Grignard reagents in the presence of NiCl2(Ph2PCH2CH2CH2PPh2) to afford the cross-coupling products in high yields. The reaction of 2,2′-dipyridyl disulfide with 3-phenylpropylmagnesium bromide is also described.
ESTERIFICATION WITH MIXED ANHYDRIDE ACTIVATED BY INTRAMOLECULAR CYCLIZATION
Authors: Horimoto Hideaki , Takimoto Seiji , Katsuki Tsutomu , Yamaguchi Masaru
Published: July 2006

Mixed anhydrides, prepared from α-bromo-o-toluoyl bromide and carboxylic acids, were activated by an intramolecular cyclization when heated in the presence of alcohols, giving the corresponding carboxylic esters in good yield with the elimination of phthalide.
A CONVENIENT PREPARATION OF 2-SUBSTITUTED 2-CYCLOPENTENONES FROM CYCLOPENTANONE USING 2-(MORPHOLINOTHIO)BENZOTHIAZOLE
Authors: Torii Sigeru , Tanaka Hideo , Kudai Toshihiro , Watanabe Sinichi
Published: July 2006

2-Substituted 2-cyclopentenones (4), a precursor of jasmonoids, were prepared in 47–77% overall yields from cyclopentanone (1) via 2-(2-benzothiazolylthio)cyclopentanone (2). Treatment of 1 with 2-(morpholinothio) benzothiazole gave 2 in 98% yield. Alkylation of 2 with RBr–K2CO3–KI–acetone followed by removal of the 2-mercaptobenzothiazole by thermolysis in benzene containing p-TsOH at 140 °C afforded (4) smoothly.
COMPLEX FORMATION ENTHALPIES OF TETRANACTIN WITH ALKALI IONS IN METHANOL
Authors: Ueno Masaharu , Kishimoto Hiroshi
Published: July 2006

The enthalpies of complex formation of tetranactin with alkali ions in methanol were measured by a micro-calorimeter. The enthalpies were mostly determined by conformational energies of complexes and solvation enthalpies of ions. The minimum enthalpy was observed for potassium ion complex. This tendency coincided with the ion selectivity of tetranactin.
3,3,7,7-BIS-(10′-METHYL-9′,9′-ACRIDANYL)-1,2,5,6-TETRAOXOCANE, A DIOXETANE DIMER, FROM THE REACTION OF 10-METHYL-9-METHYLENE-9,10-ACRIDANE WITH SINGLET OXYGEN
Authors: White Emil H , Suzuki Nobutaka , Hendrickson William H
Published: July 2006

The methylene blue sensitized oxygenation of 10-Methyl-9-methylene-9,10-acridane (MMA) at −78°C yields three chemiluminescent compounds. The most stable compound, with a half-life at 0° of 15 min, is 3,3,7,7-bis-(10′-methyl-9′,9′-acridanyl)-1,2,5,6-tetraoxocane, a dioxetane dimer. The most unstable compound, with a half-life at −60°C of 2 min, is believed to be the dioxetane of MMA. The compound of intermediate stability, with a half-life at −20°C of 5 min, is believed to be the zwitterion form of the ring opened dioxetane stabilized by a hydrogen bond to water (or, by choice, to some other weak acid).
SYNTHESES OF 24,25-DIDEOXY-FASCICULOL-A AND FASCICULOL-A, CONSTITUENT OF NAEMATOLOMA FASCICULARE (FR.) KARST, A POISONOUS BITTER MUSHROOM
Authors: Kikuchi Tohru , Kanaoka Matao , Hanagaki Sayaka , Kadota Shigetoshi
Published: July 2006

24,25-Dideoxy-fasciculol-A, fasciculol-A and its C-24 epimer were synthesized from lanosterol and the absolute stereo-structure of fasciculol-A was confirmed.
MICROBIAL STEREODIFFERENTIATING REDUCTION OF (±)-4-METHYL-1-OXO[2.2]METACYCLOPHANE AND REVISION OF THE ABSOLUTE CONFIGURATION OF 4-SUBSTITUTED [2.2]METACYCLOPHANES
Authors: Nakazaki Masao , Hirose Yoshiki , Shimizu Toru , Suzuki Takaaki , Ishii Akira , Makimura Masaru
Published: July 2006

The (−)-Cotton effect indicates (pS)-configuration to (−)-4-methyl-1-oxo[2.2]metacyclophane (17) which was isolated from a culture solution of (±)-14 with Rhodotorula rubra, and the conversion of (−)-17 to (+)-4-methyl[2.2]metacyclophane (21) via 19 assigns (pR)-configuration to (+)-21, contrary to Schlögl’s proposal.
SPINNING GLASS CELL FOR HIGH-PRESSURE HIGH-RESOLUTION NMR MEASUREMENTS
Authors: Yamada Hiroaki , Fujino Kazuhiko , Nakatsuka Masakatsu , Sera Akira
Published: July 2006

A simple device for a spinning high-pressure glass cell eliminated the use of a hand pump and a Bourdon gauge in performing the high-pressure high-resolution NMR. Internal rotation of a substituted triazene has been examined in a dilute solution up to 3000 bars at 35°C.
SYNTHESIS OF NEW MACROCYCLIC COPPER(II) COMPLEX DERIVED FROM METHYL VINYL KETONE AND COPPER(II) COMPLEX OF N-SUBSTITUTED DIAMINE
Authors: Makino Tadashi , Hata Kazuyuki , Saburi Masahiko , Yoshikawa Sadao
Published: July 2006

A new macrocyclic copper(II) complex was prepared by condensation reaction between methyl vinyl ketone and bis(3-(S)-ahaz)copper(II) complex (3-(S)-ahaz; 3(S)-3-aminohexahydroazepine). Sodium Borohydride could reduce the C=N bonds of the condensation product to a saturated mcrocyclic tetramine copper(II) complex.
SYNTHESIS AND REACTION OF 3-METHYLENE-2,3-DIHYDROINDOLIZIN-2-ONE
Authors: Kakehi Akikazu , Ito Suketaka , Nakanishi Kazunori , Kitagawa Masahiko
Published: July 2006

The alkaline treatment of 1-[1-ethoxycarbonyl-2,2-bis(ethylthio)ethenyl]-2-ethylpyridinium iodide in chloroform gave the corresponding self-condensation product, 1-methyl-3-[1,1-bis(ethylthio)methylene]indolizin-2-one, in good yield, and the reaction of the indolizinone with ethyl cyanoacetate in the presence of triethylamine afforded 2-cyano-1-ethylthio-5-methyl-3-oxo-3H-pyrano[2,3-b]indolizine in 34% yield.
THE STRUCTURE OF BIS (O,O′-DIMETHYL DITHIOPHOSPHATO) (TRIPHENYLPHOSPHINE)COBALT(II)
Authors: Shimoi Mamoru , Ouchi Akira , Sato Shoichi , Saito Yoshihiko
Published: July 2006

The crystal and molecular structure of the title complex has been determined by X-ray diffraction. It is a distorted trigonal-bipyramidal complex: each dithiophosphato ligand spanns an oblique edge of the coordination polyhedron, and triphenylphosphine occupies the fifth coordination site with unusually long Co–P bond length of 2.551 Å.
SYNTHESIS OF THE A RING MOIETY OF TRIPTOLIDE
Authors: Koike Haruo , Tokoroyama Takashi
Published: July 2006

The synthesis of the A ring moiety of triptolide 1 has been achieved, starting from dehydroabietic acid 3.
REACTIONS OF BENZENES WITH ACETYLENES CATALYZED BY RHODIUM CARBONYL UNDER CARBON MONOXIDE
Authors: Hong Pangbu , Cho Bo-Re , Yamazaki Hiroshi
Published: July 2006

The reaction of benzene with diphenylacetylene catalyzed by Rh4(CO)12 under carbon monoxide gives triphenylethylene and 2,3-diphenylindenone. The reactions of mono-/di-substituted benzenes with the acetylene also give the corresponding olefins and 2,3-diphenylindenones.
UNUSUAL 1,3-HYDROGEN SHIFT IN THE REACTION OF Na2Fe(CO)4 WITH METHYL E-3-CHLORO-2-BUTENOATE
Authors: Mitsudo Take-aki , Watanabe Hiroyoshi , Watanabe Yoshihisa , Takegami Yoshinobu
Published: July 2006

Methyl E-3-chloro-2-butenoate reacts with Na2Fe(CO)4 in THF at 25°C affording an unexpected [η3-2-(methoxycarbonylmethyl)acryloyl]tricarbonylferrate which has been derived by an unusual 1,3-hydrogen shift. The reaction was rationalized by assuming a (η2-allene)hydridoferrate intermediate.
PLATINUM(II) COMPLEXES OF S,S-DIMETHYLSULFONIUM 2-PICOLINYLMETHYLIDE AND X-RAY MOLECULAR STRUCTURE OF CHLORO(DIMETHYLSULFIDE)(2-PICOLINYLCHLOROMETHYL) PLATINUM(II)
Authors: Matsubayashi Gen-etsu , Kondo Yasuo , Tanaka Toshio , Nishigaki Satoshi , Nakatsu Kazumi
Published: July 2006

S,S-Dimethylsulfonium 2-picolinylmethylide (PyC(O) \barCH+SMe2, Ydms) reacts with PtCl2(SMe2)2 to give PtCl2Ydms and PtCl(SMe2)(PyC(O)CHCl); the former involves the coordination of both the pyridine nitrogen and ylide carbon atoms, and the latter is a complex with the 2-picolinylchloromethyl ligand which is formed by the fission of the ylide carbon to sulfur bond. An X-ray structure of the latter complex is determined.
SURFACE STATE AND CATALYTIC ACTIVITY OF MoO3/Al2O3 CATALYST IN THE HYDRODESULFURIZATION OF THIOPHENE STUDIED WITH X-RAY PHOTOELECTRON SPECTROSCOPY
Authors: Okamoto Yasuaki , Tomioka Hiroyuki , Imanaka Toshinobu , Teranishi Shiichiro
Published: July 2006

The surface states of MoO3/Al2O3 catalysts used for the hydrodesulfurization of thiophene were characterized with XPS and compared with the activities for the reaction. It was found that the molybdenum with a stoichiometry of S/Mo(IV)=1 is much more active than MoS2, indicating the importance of an anion vacancy for the reaction.
REGIOSELECTIVE CARBON-CARBON BOND FORMATION AT THE α-POSITION OF A SULFUR STABILIZED ALLYL CARBANION VIA AN ALKYLTHIOALLYLBORON “ATE” COMPLEX
Authors: Yamamoto Yoshinori , Yatagai Hidetaka , Maruyama Kazuhiro
Published: July 2006

Reaction of lithium alkylthioallylboron “ate” complexes (3), prepared from alkylthioallyllithium (1) and triethylborane at −78°C in ether, with carbonyl compounds proceeds via the attack at the α-position to produce the corresponding α-alkylated derivatives (4) in good yields.
ENANTIOSELECTIVE CATALYTIC HYDROGENATION OF α-ACETAMIDOACRYLIC ACIDS. DIPHOSPHINITE-RHODIUM CATALYSTS DERIVED FROM A SUGAR
Authors: Sugi Yoshihiro , Cullen William R
Published: July 2006

A chiral diphosphinite: methyl 4,6-O-benzylidene-2,3-bis-O-diphenylphosphino-β-d-glucopyranoside (β-POOP) was derived from d-glucose. High enantiomeric excess values of up to 91% were achieved in the hydrogenation of α-acetamidoacrylic acids using the rhodium complex of β-POOP.
ASSIGNMENT OF β-PROTON RESONANCES OF l-HISTIDINE BY STEREOSELECTIVE DEUTERIUM SUBSTITUTION
Authors: Kainosho Masatsune , Ajisaka Katsumi , Sawada Seiji , Tanokura Masaru , Miyazawau Tatsuo
Published: July 2006

The 270-MHz 1H NMR spectrum of the mixture of deuterated histidines was compared at pD 8.2 with that of l-histidine. It was seen that the lower-field β-proton resonance disappeared in the deuterated species, in which one of the β-protons was selectively replaced with a deuterium. Accordingly, at this pD, the lower-field β-proton of l-histidine is assingnable to pro-R and the higher-field one to pro-S.
A DEMONSTRATION OF THE EXISTENCE OF ISOKINETIC TEMPERATURE IN THE THERMAL ISOMERIZATION OF TRIPHENYLFORMAZANS
Authors: Nishimura Norio , Sueishi Yoshimi , Yamamoto Shunzo
Published: July 2006

Substituent effects on the rate of the thermal isomerization of triphenylformazans have been studied at various temperatures. Strictly linear ΔH≠–ΔS≠ relationship was found to hold for a limited series of compounds. The isokinetic temperature β was calculated to be 281K from the ΔH≠ vs. ΔS≠ plot. Reversal in the rate for these compounds was observed above and below this temperature.
ENANTIOSELECTIVE ADDITION OF ACETYLENE TO ALDEHYDE. PREPARATION OF OPTICALLY ACTIVE ALKYNYL ALCOHOLS
Authors: Mukaiyama Teruaki , Suzuki Keisuke , Soai Kenso , Sato Toshio
Published: July 2006

Enantioselective addition of acetylene to aldehyde was investigated by the use of (2S, 2′S)-2-hydroxymethyl-1-[(1-methylpyrrolidin-2-yl)methyl]pyrrolidine as a chiral ligand. The addition of lithium trimethylsilylacetylide to benzaldehyde afforded the corresponding alkynyl alcohol in 92% optical yield.
REGIO- AND STEREOSELECTIVITY IN ALKYLATIONS OF DIANIONS DERIVED FROM ALLYLIC DITHIOCARBONATE p-TOLUENESULFONYLHYDRAZONES
Authors: Nakai Takeshi , Mikami Koichi
Published: July 2006

Facile generations of dianions from various dithiocarbonate tosylhydrazones including allylic ones are described. The dianions so generated were found to exhibit a high syn-stereoselectivity in their alkylations and also a high α-regioselectivity in allylic systems. The importance of the six-membered chelation of the dianionic species to the observed regio- and stereoselectivity has been evaluated.
ACID-INDUCED REARRANGEMENT OF α-PINENE
Authors: Muneyuki Ryonosuke , Yoshimura Yohko , Tori Kazuo
Published: July 2006

Lanthanoid-assisted 1H NMR analyses of deuteriums incorporated in D+-catalyzed rearrangement products of α-pinene showed that the pathways to the exo- (3, 5) and endo-products (2, 4) are different in nature, and that the C-1–C-6 σ-participation became involved in an electrophilic attack from the exo-side.
SELECTIVE SEPARATION OF CADMIUM FROM ZINC AND COPPER(II) WITH CRYSTALLINE ANTIMONIC(V) ACID AS A CATION-EXCHANGER
Authors: Abe Mitsuo
Published: July 2006

Crystalline antimonic(V) acid (C-SbA) shows an extremely high value of distribution coefficient for Cd(II), and the low values for Zn(II) and Cu(II) in nitric acid media. The Zn(II) and Cu(II) can be separated selectively from Cd(II) with the C-SbA using a 3M nitric acid as an eluant.
ELEKTRONENREICHE HEPTAFULVENE ALS BAUSTEINE VON AZULENEN. 8-METHOXYHEPTAFULVEN
Authors: Hasenhündl Adelheid , Rapp Knut M , Daub Jörg
Published: July 2006

8-Methoxyheptafulvene (5), the first C-8 monosubstituted electron-rich heptafulvene is synthesized from 1,3,5-cycloheptatriene-7-carbaldehyde dimethyl acetal (4) and lithium diisopropylamide. (8+2) π cycloadditions of (5) are described. Dimethyl azulene-1,2-dicarboxylate (9) and dimethyl 3-methoxyazulene-1,2-dicarboxylate (8) are obtained from the cycloadduct of (5) and dimethyl acetylenedicarboxylate.
REACTION OF ENAMINE WITH CYCLOHEXENONE IN POLAR SOLVENT
Authors: Singh Yash Karan , Rao R Balaji
Published: July 2006

When 1-piperidino-1-cyclopentene was condensed with cyclohex-2-en-1-one in DMSO, 6-piperidinotricyclo [5.2.2.02,6]-undecan-8-one was obtained. However, with 1-piperidino-1-cyclohexene only Michael product was obtained. A tentative mechanism is proposed.
SEPARATION AND CHARACTERIZATION OF SPIN-ADDUCTS IN A γ-IRRADIATED AQUEOUS SOLUTION OF 2-METHYL-2-NITROSOPROPANE BY A HIGH PERFORMANCE LIQUID CHROMATOGRAPH EQUIPPED WITH AN ESR SPECTROMETER
Authors: Makino Keisuke , Suzuki Nobuhiro , Moriya Fumio , Rokushika Souji , Hatano Hiroyuki
Published: July 2006

Spin-adducts produced in a γ-irradiated aqueous solution of 2-methyl-2-nitrosopropane were investigated by means of high performance liquid chromatography and ESR spectroscopy. The existence of five kinds of spin-adducts was found. Three of them were assigned to the structures: tBuN(O·)–CH3, tBuN(O·)–CH2C(CH3)2NO or tBuN(O·)–CH2C(CH3)2–N+(O−)=N+(O−)tBu and tBuN(O·)–tBu.
VERSATILE METHOD FOR THE PREPARATION OF OPTICALLY ACTIVE α-HYDROXY ALDEHYDES WITH DESIRED CONFIGURATIONS
Authors: Mukaiyama Teruaki , Sakito Yoji , Asami Masatoshi
Published: July 2006

A convenient method was established for the asymmetric synthesis of various α-hydroxy aldehydes with high optical yields starting from methoxycarbonyl aminal, prepared from methyl hydroxymethoxyacetate and (S)-2-(anilinomethyl)pyrrolidine. The configurations of α-hydroxy aldehydes are arbitrarily controlled by the order of the introduction of two substituents in the α-hydroxy aldehydes originated from Grignard reagents.
A CONVENIENT METHOD FOR THE PREPARATION OF 3-ACYLFURANS. A NEW SYNTHESIS OF PERILLA KETONE
Authors: Inomata Katsuhiko , Sumita Manabu , Kotake Hiroshi
Published: July 2006

It was found that 3-(phenylthio)propanal ethylene acetal (IV) is a useful starting material for the preparation of 3-acylfurans. Some 3-acylfurans, including perilla ketone [3-(4-methylpentanoyl)furan], were prepared by the use of IV from an aziridide or aldehydes.
FACILE ACETYLATION OF THE UNCOORDINATED HYDROXY GROUP OF N-HYDROXYETHYLETHYLENEDIAMINE-N,N′,N′-TRIACETATOAQUACHROMIUM(III) COMPLEX
Authors: Ogino Hiroshi , Shimura Makoto , Masuko Akihiko , Tanaka Nobuyuki
Published: July 2006

The uncoordinated hydroxy group of HEDTRA in Cr(hedtra)(H2O) was readily acetylated by acetic anhydride under a mild condition. The coordinated water of the acetylated complex was reversibly substituted by acetate ions at such a great rate as that of Cr(hedtra)(H2O).
POLYMERIZATION OF METHYL METHACRYLATE INITIATED WITH POLY(FORMYLSTYRENE)
Authors: Imoto Minoru , Maeda Takamasa , Murayama Noriyuki , Ouchi Tatsuro
Published: July 2006

The polymerization of methyl methacrylate(MMA) initiated by poly(formylstyrene) (PFS) was carried out in p-dioxane at 85°C. The rate of polymerization was expressed by the following equation: Rp = const. [PFS]0.43[MMA]1.31. The polymerization proceeded homogeneously through a radical mechanism. The initiating ability of PFS was found to be larger than that of benzaldehyde indicating a macromolecular effect on the polymerization.
SELENIUM CONTAINING NUCLEOTIDES: Se-ETHYL AND Se-PHENYL THYMIDINE 5′-PHOSPHOROSELENOATES
Authors: Sekine Mitsuo , Hata Tsujiaki
Published: July 2006

A new type of nucleotide derivatives containing selenium, Se-ethyl and Se-phenyl thymidine 5′-phosphoroselenoates were synthesized from thymidine 5′-phosphonate via silyl phosphite intermediates and their properties were also described.
8-QUINOLINESULFONYL CHLORIDE: A NEW COUPLING AGENT IN OLIGORIBONUCLEOTIDE SYNTHESIS VIA PHOSPHOTRIESTER APPROACH
Authors: Takaku Hiroshi , Yoshida Masatoshi , Kato Masaatsu , Hata Tsujiaki
Published: July 2006

8-Quinolinesulfonyl chloride (QS) was proposed and proved to be a useful coupling agent in oligoribonucleotide synthesis via phosphotriester approach.
MODIFIZIERTE WICHTERLE-REAKTION: EINE AlCl3-INDUZIERTE UMWANDLUNG VON VINYLCHLORIDEN IN KETONE
Authors: Kobayashi Makoto , Fujiyama Naoki , Yoshioka Hidetoshi , Matsumoto Takeshi
Published: July 2006

In CH3NO2 reagierten α-(3-Chlor-2-butenyl)ketone mit AlCl3 zu den entsprechenden 1,5-Diketonen und teilweise bis zu den Annelierungsprodukten. Der Zusatz von p-Nitrophenol beschleunigte die Reaktionen und die Ausbeuten wurden verbessert. Analog liessen sich α-(2-Chlorallyl)cyclohexanone in die entsprechenden 1,4-Diketone uberfuhren.
SUBSTITUENT EFFECTS ON 13C CHEMICAL SHIFTS OF KETENIMINES A NEW METHOD FOR DETERMINATION OF σp− CONSTANTS
Authors: Firl Joachim , Schink Karl , Schaschke Horst
Published: July 2006

13C chemical shifts for the benzene ring carbon atoms of a series substituted alkylketene-N-phenylimines 1 – 12 are reported. An excellent linear correlation is found between δci and σp− of the variable substituent χ which allows the determination of new σp− constants. Furthermore, the data suggest that the N-phenyl group rather is conjugated with the C=N-π-bond than with the lone pair.
1,2,3-BENZOTROPOQUINONE
Authors: Kawamata Akira , Kikuchi Emiko , Hirama Masahiro , Fujise Yutaka , Itô Shô
Published: July 2006

The title compound, a benzolog of o-tropoquinone, was synthesized by the DDQ oxidation of the corresponding hydroxytropolone. Effect of benzene annelation on the physical properties (UV, PMR, CMR, electron affinity) of o-tropoquinone was evaluated. The annelation causes more modification to o-tropoquinone than to o-benzoquinone. This may be due to the reduced planarity of 7-membered quinone ring in the title compound. Easy reduction by HCl and facile BF3-induced aromatization to 1,2-dihydroxynaphthalene were observed.
ONE STEP SYNTHESIS OF 4-METHYLAMINOMETHYLINDOLE
Authors: Somei Masanori , Yamada Fumio , Kaneko Chikara
Published: July 2006

4-Methylaminomethylindole was prepared in one step in 20% yield from 2-methyl-5-nitroisoquinolinium iodide by the reaction with aqueous TiCl3.
PHOTO-INDUCED ELECTRON-TRANSFER REACTIONS OF DI-μ-OXO-BINUCLEAR MANGANESE COMPLEXES
Authors: Mizuno Kazuhiko , Ogawa Jun , Otsuji Yoshio
Published: July 2006

Photo-induced redox reactions of di-μ-oxo-binuclear manganese complex [Mn2IV,IIIO2(bpy)4]3+(ClO4)3[1] were studied in the presence of organic compounds. Irradiation of a CH3CN-1.0 M H2SO4(3:1) solution of [1] in the presence of anthracene gave anthraquinone with the reduction of [1]. On the other hand, similar irradiation of [1] in the presence of 9,10-dicyanoanthracene promoted the photochemical oxidation of water.
REDUCTIVE DIMERIZATION OF α,β-UNSATURATED KETONES BY LiAlH4–Fe3(CO)12–HCl REAGENT SYSTEM
Authors: Nakanishi Saburo , Shundo Takatsugu , Nishibuchi Takehiko , Otsuji Yoshio
Published: July 2006

Aromatic α,β-unsaturated ketones were converted into 1,5-hexadiene derivatives by use of LiAlH4–Fe3(CO)12–HCl reagent system.
TRIALKYLBORANE-INDUCED CHLORINATION OF ALKANES WITH IODOBENZENE DICHLORIDE
Authors: Arase Akira , Hoshi Masayuki , Masuda Yuzuru
Published: July 2006

Alkanes were chlorinated with iodobenzene dichloride in the presence of the catalytic amount of trihexylborane almost quantitatively based on iodobenzene dichloride employed. Chlorine atom was introduced in a highly selective manner into the internal carbon atom of alkanes.
H2–D2 AND 16O2–18O2 EXCHANGE REACTION ON Rh–Sn–γ–Al2O3 AND Ru–Sn–γ-Al2O3 IN RELATION TO THE SIMULTANEOUS REMOVAL OF NO AND CO
Authors: Masai Mitsuo , Murata Keishi , Yabashi Masakazu
Published: July 2006

The activation energy of the exchange reaction increases only slightly in H2–D2 and decreases significantly in 16O2–18O2 by alloying Sn with Rh or Ru on γ-A12O3. Tin promotes the activation of oxygen on Rh– or Ru–γ-Al2O3. The promoting effect of Sn in the removal of NO and CO in the presence of O2 reported before may be due to the activation of oxygen in the reaction.
DISMUTATION OF ALLYL ALCOHOLS TO ALKENES AND α,β-UNSATURATED ALDEHYDES ON THE INTERACTION WITH Ni(cod)2 IN THE PRESENCE OF LIGANDS
Authors: Yamamoto Takakazu , Ishizu Junichi , Yamamoto Akio
Published: July 2006

Allyl alcohols RCH=CHCH2OH (R = H,CH3, C6H5) are converted into corresponding alkenes RCH=CHCH3, α,β-unsaturated aldehydes RCH=CHCHO, and water by the interaction with bis(1,5-cyclooctadiene)nickel Ni(cod)2in the presence of ligands under mild conditions. The formation of the products is explained by assuming oxidative addition of the alcohol to nickel involving O–H or C–OH bond cleavage.
CYCLOADDITION REACTIONS OF 4,6-DIPHENYLTHIENO[3,4-c]-1,2,5-OXADIAZOLE AND -1,2,5-THIADIAZOLE WITH 6,6-DIPHENYLFULVENE AND TROPONE
Authors: Tsuge Otohiko , Takata Toshiaki , Noguchi Michihiko
Published: July 2006

4,6-Diphenylthieno[3,4-c]-1,2,5-oxadiazole (1) reacts as a thiocarbonyl ylide with 6,6-diphenylfulvene to give the exo-[4 + 2] adduct via a stereoselective and regiospecific cycloaddition. The exo-adduct undergoes thermal cleavage of the oxadiazole ring to nitrile and nitrile oxide moieties which can be trapped as 1,3-cycloadducts to the fulvene and dimethyl acetylenedicarboxylate. The reaction of 4,6-diphenylthieno[3,4-c]-1,2,5-thiadiazole (2) with the fulvene affords a mixture of analogous exo- and endo-adducts which are subject to a retro-cycloaddition reaction. On the other hand, 1 reacts with tropone to give the corresponding [4 + 6] adduct which is susceptible to a retro-cycloaddition reaction. However, 2 did not react with tropone.
SYNTHESIS OF [0]METACYCLO[2]METACYCLO[0](1,1′)FERROCENOPHANE-7-ENE
Authors: Kasahara Akira , Izumi Taeko , Umezawa Hiroshi
Published: July 2006

[0]Metacyclo[2]metacyclo[0](1,1′)ferrocenophane-7-ene revealing transannular electronic interactions was synthesized via the intramolecularly reductive coupling of 1,1′-bis(m-formylphenyl)ferrocene with TiCl4–Zn.
ON-LINE RESEARCHER’S DATABASE ON THE ELECTRICAL DOUBLE LAYER CONSTRUCTED WITH A USER-ORIENTED DATABASE MANAGEMENT SYSTEM COOD
Authors: Yamada Akifumi , Kato Yoshikiyo , Tanaka Nobuyuki
Published: July 2006

On-line researcher’s databases on the electrical double layer (ELDOL and ELCHEM) have been constructed with a user-oriented database management system COOD (Conversationally Organized Database Management System). Numerical data together with bibliographic informations were stored in these databases. They are supported by graphic display facilities.
REACTIVE FORM OF 12-MOLYBDOSILICATE CATALYST ON FRIEDEL–CRAFTS-TYPE REACTION
Authors: Nomiya Kenji , Sasa Sadayoshi , Miwa Makoto
Published: July 2006

Stepwise replacement of protons in H4[SiMo12O40] by tetrabutylammonium cation and catalysis by the replaced compounds for alkylation of toluene with benzyl chloride have been investigated. Only three-protonated compound showed comparable activity with that of parent one.
ENHANCED CATALYTIC EFFECT OF FREEZE-DRIED POTASSIUM FLUORIDE FOR ALKYLATION OF PROTIC COMPOUNDS
Authors: Ishikawa Nobuo , Kitazume Tomoya , Nakabayashi Masao
Published: July 2006

Freeze-dried potassium fluoride was found to be much more effective as a hydrogen-bond forming catalytic reagent for alkylation of protic compounds than usual calcine-dried potassium fluoride. Phenol, thiophenol, aniline, and acetylacetone were easily alkylated with methyl or ethyl iodide in the presence of the reagent. Freeze-dried potassium fluoride, however, had no effect for the fluorination of activated chlorine compounds.
SYNTHESIS OF DEHYDRO-3,3′-BIS(p-HYDROXYCINNAMOYL)-5,5′-METHYLENEDIFILICINIC ACID, AN ANALOG OF CARTHAMIN
Authors: Obara Heitaro , Onodera Jun-ichi , Shirasaki Fumio
Published: July 2006

In connection with the studies on the structure of carthamin (1), dehydro-3,3′ -bis(p-hydroxycinnamoyl)-5,5′-methylenedifilicinic acid, an analog of 1, was synthesized from 2-benzoylphloroglucinol through five steps and its properties were compared with those of 1.
SELECTIVE FORMATION OF KETONES FROM PROPENE, CO AND H2O: COBALT BASED CATALYTIC HYDROCARBONYLATION
Authors: Murata Kazuhisa , Matsuda Akio
Published: July 2006

A complex prepared in situ from Co2(CO)8 and 1,2-bis(diphenylphosphino)ethane (diphos) was found to be an effective catalyst for selective hydrocarbonylation of propene to give dipropyl ketones.
A FACILE METHOD FOR PREPARATION OF THE OPTICALLY PURE 3-HYDROXYTETRADECANOIC ACID BY AN APPLICATION OF ASYMMETRICALLY MODIFIED NICKEL CATALYST
Authors: Tai Akira , Nakahata Masaaki , Harada Tadao , Izumi Yoshiharu , Kusumoto Shoichi , Inage Masaru , Shiba Tetsuo
Published: July 2006

The enantioface-differentiating hydrogenation of methyl 3-oxotetradecanoate over (R,R)-tartaric acid-NaBr-modified nickel gave methyl (R)-3-hydroxytetradecanoate(III) in 85% e.e.. After HI was converted to dicyclohexylammonium salt of 3-hydroxytetradecanoic acid (I), the salt was recrystallized three times from acetonitrile and was then treated with acid to give optically pure (R)-I in a good yield.
3-(5-NITRO-2-PYRIDON-1-YL)-1,2-BENZOISOTHIAZOLE 1,1-DIOXIDE (BID-NPy) AS A NEW EFFECTIVE CONDENSING REAGENT
Authors: Ahmed Alauddin , Fukuda Hirohiko , Inomata Katsuhiko , Kotake Hiroshi
Published: July 2006

3-(5-Nitro-2-pyridon-1-yl)-1,2-benzoisothiazole 1,1-dioxide (BID-NPy) was found to be a useful condensing reagent. Various dipeptides and esters were prepared in good yields using this reagent.
DISPERSION OF COPPER SUPPORTED ON SILICA AND METHANOL REFORMING REACTION
Authors: Kobayashi Haruo , Takezawa Nobutsune , Minochi Chiaki , Takahashi Kazunari
Published: July 2006

Turnover frequency, activation energy and selectivity of the methanol reforming reaction CH3OH + H2O = CO2 + 3H2 varied greatly with the specific surface area of metallic copper, when the title reaction was carried out over copper supported on silica. It was indicated that the reaction was strongly affected by the dispersion of copper.
THE MANNICH REACTION OF CARBONYL COMPOUNDS VIA SILYL ENOL ETHERS BY A COMBINATION OF CHLOROIODOMETHANE AND N,N ,N′,N′-TETRAMETHYLDIAMINOMETHANE
Authors: Miyano Sotaro , Hokari Hiroshi , Mori Akira , Hashimoto Harukichi
Published: July 2006

The Mannich dimethylaminomethylation of carbonyl compounds is conveniently carried out via trimethylsilyl enol ethers by a combination of chloroiodomethane and N,N,N′,N′-tetramethyldiaminomethane in DMSO or DMF as the solvent at ambient temperature.
FACILE OXIDATION OF ALCOHOLS BY 3-HYDROXY-N-METHYLACRIDINIUM ION (A NEW NAD+ MODEL COMPOUND)
Authors: Shinkai Seiji , Hamada Hisatake , Kuroda Hideo , Manabe Osamu
Published: July 2006

3-Hydroxy-N-methylacridinium iodide (Ac+OH) oxidized alcohols with the aid of potassium t-butoxide, whereas N-methylacridinium iodide (Ac+) could not oxidize alcohols under the same reaction conditions. The results indicate that the 3-hydroxyl group is crucial in modifying an N-methylacridinium nucleus as an NAD+ model oxidizing agent.
BIOINORGANIC APPROACH TO THE CYTOCHROME OXIDASE ACTIVE SITE. STRONGLY SPIN-COUPLED COPPER(II)–IRON(III) HETERO-METAL BINUCLEAR COMPLEXES
Authors: Okawa Hisashi , Kanda Wakako , Kida Sigeo
Published: July 2006

Copper(II)–iron(III) binuclear complexes, CuFe(fsaR)Cl·nH2O, with N,N′-bis(3-carboxysalicylidene) alkanediamines (H4fsaR) were prepared and characterized. Cryomagnetic measurements indicated a considerably strong antiferromagnetic spin-exchange interaction operating between the metal ions. The exchange integrals (ca.−50 cm−1) are the largest among the copper(II)–iron(III) complexes so far reported, and hence the complexes mimic the cytochrome oxidase active center.
LANTHANOID-INDUCED 59Co NMR SHIFTS OF THE ADDUCTS OF TRIS(ACETYLACETONATO)Co(III) WITH LN(FOD)3 AND LN(DPM)3 IN SOLUTIONS
Authors: Hirayama Masatoshi , Kawamata Yoshimichi
Published: July 2006

The 59Co shifts of tris (acetylacetonato)Co(III) induced by Ln(fod)3 and Ln(dpm)3(Ln=La, Pr, Nd, Sm, Eu) were determined by observing separately the resonances of free and complexed Co(acac)3. An attempt to separate a contact contribution using theoretical D and 〈Sz〉 values was successfully made by assuming the increase in an adduct formation shift with increasing number of 4f electrons.
SUBSTANTIAL EQUILIBRIUM SHIFT IN RACEMIC [Cr(ox)2(phen)]− ATTAINED BY THE PFEIFFER EFFECT WITH QUININE OR QUINIDINE HYDROCHLORIDE AS AN ENVIRONMENT SUBSTANCE IN WATER
Authors: Miyoshi Katsuhiko , Matsumoto Yuuko , Yoneda Hayami
Published: July 2006

The chiral equilibrium of [Cr(ox)2(phen)]− was found to be displaced greatly (ca. 18% O.Y.) in water toward its (+)546- or (−)546- enantiomer upon the addition of l-(8S,9R)-quinine or d-(8R,9S)-quinidine hydrochloride, respectively, which was attributed to the combined action of electrostatic and hydrophobic (or π-π) interactions between the complex and l-quininium or d-quinidinium cation.
FORMATION OF ARYL RADICALS FROM NITROSOARENES BY THE REACTION WITH DIPHENYLMETHYLENEAMINO RADICALS
Authors: Suehiro Tadashi , Masuda Seiichi , Motoyama Nobuyuki , Sasaki Masaru
Published: July 2006

By the reaction between nitrosoarenes and diphenylmethyleneamino radicals at 60–70 °C aryl radicals are generated together with nitrogen and benzophenone.
SYNTHESIS OF CYCLIC TRISULFIDES BY USING SILYL AND TIN SULFIDES
Authors: Yamazaki Noboru , Nakahama Seiichi , Yamaguchi Kazuo , Yamaguchi Tetsuhiko
Published: July 2006

Sulfur dichloride was allowed to react with linear and cyclic, silyl and tin sulfides prepared from alkanedithiols. Of the sulfides, bis(trimethylsilyl) sulfides were most effective for synthesis of cyclic trisulfides.
MÖSSBAUER EMISSION SPECTROSCOPIC STUDIES ON SPIN EQUILIBRIUM COMPLEXES [57Co(terpy)2]X2 (X=C1 and ClO4)
Authors: Maeda Yonezo , Ohshio Hiroki , Takashima Yoshimasa
Published: July 2006

The 57Fe Mössbauer emission spectroscopic technique has been applied to the study of after-effects of electron capture in [57Co(terpy)2]Cl2·5H2O and [57Co(terpy)2] (ClO4)2·2H2O (where terpy= 2,2′,2″-tripyridyl) which exhibit an anomalous magnetic behavior. These results were interpreted on the basis of the difference in the spin multiplicity of the central cobalt ion.
1,3-DIPHENYLTHIAZOLO[3,4-a]BENZIMIDAZOLE, A NEW RING-FUSED TETRAVALENT SULFUR THIAZOLE SYSTEM
Authors: Tsuge Otohiko , Shiraishi Hidehiko , Takata Toshiaki
Published: July 2006

1,3-Diphenylthiazolo[3,4-a]benzimidazole, a new 10π-electron heterocycle containing tetravalent sulfur, was prepared by the reaction of 1,2-dibenzoylbenzimidazole with phosphorus pentasulfide in refluxing toluene. Its cycloadditions with alkenes and alkynes occurred across the thiocarbonyl ylide dipole in highly stereoselective and/or regiospecific fashions.
A MICELLAR MODEL OF ZINC CONTAINING METALLOENZYMES
Authors: Eiki Toshio , Mori Mikio , Kawada Shuji , Matsushima Kazumi , Tagaki Waichiro
Published: July 2006

N-Dodecyl-2-hydroxymethylimidazole (1) was found to be unusually active in the transesterification toward p-nitrophenyl picolinate (4), when the reaction was carried out in the presence of CTABr micelle and zinc ion.
SYNTHESIS OF DESTOMIC ACID AND ITS 6-EPIMER
Authors: Hashimoto Hironobu , Asano Katsuji , Fujii Fumiko , Yoshimura Juji
Published: July 2006

The structure of 6-aminoheptonic acid component contained in destomycin A and C was confirmed first by chemical synthesis.
THE CO-OCCURRENCE OF FLAVAN AND 1,3-DIPHENYLPROPANE DERIVATIVES IN WOUNDED PAPER MULBERRY
Authors: Takasugi Mitsuo , Kumagai Yoshikazu , Nagao Shigemitsu , Masamune Tadashi , Shirata Akira , Takahashi Kokichi
Published: July 2006

Two antifungal compounds, designated as broussin and broussonin C, were isolated from wounded xylem tissues of paper mulberry shoots and identified as flavan and 1,3-diphenylpropane derivatives, respectively.
ENANTIOFACE-DIFFERENTIATING ADDITION OF A CHIRAL ARYLLITHIUM REAGENT TO ALDEHYDES
Authors: Asami Masatoshi , Mukaiyama Teruaki
Published: July 2006

A chiral aryllithium reagent was prepared by treating a chiral aminal, derived from (S)-2-(anilinomethyl)pyrrolidine and o-bromobenzaldehyde, with n-butyl lithium. The chiral reagent reacted highly enantioface selectively with aliphatic aldehydes and, on hydrolysis of the resulting aminals, various 3-alkyl-1-hydroxy-2-oxaindanes with high enantiomeric excesses were obtained. The oxidation of 3-butyl-1-hydroxy-2-oxaindane with silver oxide afforded (S)-3-butylphthalide, an essential oil of celery, with 88% e.e..
2kF–4kF TRANSITION IN POTASSIUM DEFICIENT PARTIALLY OXIDIZED PLATINUM SALTS, K1.75[Pt (CN)4].1.5H2O
Authors: Kobayashi Hayao , Hano Yoshio , Danno Takaaki , Kobayashi Akiko , Sasaki Yukiyoshi
Published: July 2006

X-ray photographs of K1.75[Pt(CN)4].1.5H2O showed weak 2kF reflections below 294 K, which had been overlooked in neutron and X-ray diffraction studies. These reflections suggest the 2kF eightfold structure. Above Tc, the Pt chain has a 4kF fourfold structure. The 294 K transition can be regarded as the first example of 2kF–4kF transition in the partially oxidized platinum compounds.
STUDIES ON QUINONES. VI. ACID-CATALIZED REARRANGEMENTS IN SOME 4-ACETYL-2,3-DIHYDROBENZO[b] FURANS
Authors: Barrios Luis , Ruiz V Manuel , Tapia Ricardo , Valderrama Jaime , Vega Juan C
Published: July 2006

The reaction of 2-acetyl- and 5-acetyl- 2-methoxy-1,4-benzoquinone (1a, 1c) with N-propenylpiperidine gave the corresponding 2,3-dihydrobenzo[b]furans, 2b and 2c, containing the acetyl group at C-4. Acid treatment of these dihydrofurans rearranged to 8-methyl- and 2-methoxy-8-methyljuglone (4a, 4b). Juglone (4c) and 2,3-dihydrojuglone (6) were obtained in fair yields from 4-acetyl-2,5-dihydroxy-2,3-dihydrobenzo[b]furan (2e).
A NEW SYNTHESIS OF 8-HYDROXYISOALLOXAZINES (8-HYDROXYFLAVINS)
Authors: Yoneda Fumio , Sakuma Yoshiharu , Hiromatsu Keiko , Nitta Yoshihiro
Published: July 2006

Treatment of isoalloxazine 5-oxides with acetic anhydride yielded the corresponding 8-acetoxyisoalloxazines exclusively, which are labile to hydrolysis to give 8-hydroxyisoalloxazines (8-hydroxyflavins).