bluuebunny/crossref_metadata_2025_split huggingface dataset:
Structure, Synthesis, and Stereochemistry of (+)-Orthosporin, a Phytotoxic Metabolite of Rhynchosporium Orthosporum
Authors: Ichihara Akitami , Hashimoto Masaaki , Hirai Takamasa , Takeda Ichiro , Sasamura Yasuaki , Sakamura Sadao , Sato Rinzo , Tajimi Akitoshi 
Published: May 2006

Abstract
Structure of (+)-orthosporin, a phytotoxic metabolite isolated from Rhynchosporium orthosporum has been elucidated from spectroscopic data and chemical reaction, and the stereochemistry of (+)-orthosporin and (+)-diaporthin has been confirmed by the synthesis.
Reaction of Tris(alkylthio)cyclopropenyl Cation with Pyrrole and Indoles. A Novel Synthesis of Pyrrolizine and Fluorazene Derivatives
Authors: Kojima Hideo , Ozaki Kazuyoshi , Matsumura Noboru , Inoue Hiroo 
Published: May 2006

Abstract
The treatment of tris(isopropylthio)cyclopropenylium perchlorate with pyrrole and indoles in the presence of a strong base afforded pyrrolizine and fluorazene derivatives, respectively.
How to Determine the Force Constants of MM2 Force Field in a Consistent Way?
Authors: Hase Yasunori , Sakakibara Kazuhisa , Hirota Minoru 
Published: May 2006

Abstract
General equations to determine the stretching (ks) and bending (kb) force constants of nitrogen containing bonds for Allinger’s MM2 force field have been derived on the basis of a relationship between spectroscopically determined stretching force constants (kos) and equilibrium bond length (re).
Cyclohepta[l]phenanthrenylium Ions. Intramolecular Cyclization of 2-Biphenylylcycloheptatrienes
Authors: Yamamura Kimiaki , Miyake Hideyoshi , Azumi Kazuko , Murata Ichiro 
Published: May 2006

Abstract
The intramolecular Friedel-Crafts type reaction of 3′-methoxy- and 3′,5′-dimethoxy-2-biphenylylcycloheptatrienes allowed to construct the corresponding cyclohepta[l]phenanthrenylium ions in reasonable yields. Some physical properties (UV, 1H-NMR, and pKR+) of these new cations were also described.
The Structure of Safflomin C, a Constituent of Safflower
Authors: Onodera Jun-ichi , Obara Heitaro , Hirose Ryoji , Matsuba Shigeru , Sato Noriko , Sato Shingo , Suzuki Masanobu 
Published: May 2006

Abstract
The structure of safflomin C, a yellow constituent of the flowers of Safflower (Carthamus tinctorius L.), was investigated.
Synthesis of Isophthalaldehyde Polymer and ESR Detection of High Spin States
Authors: Nogami Takashi , Kosaka Satoru , Shirota Yasuhiko , Aota Hiroyuki , Harada Akira , Kamachi Mikiharu 
Published: May 2006

Abstract
Thermal polymerization of isophthalaldehyde in the presence of a catalytic amount of p-toluenesulfonic acid gave polymer insoluble in any organic solvent. This polymer seems to possess triphenylmethyl radical as a monomer unit. It showed ESR signals of triplet and higher spin states, besides that of the organic monoradical. This type of polymer is expected to open a new field of organic ferromagnetic materials.
2,2′-(5,8-Dihydroquinoxaline-5,8-diylidene)bis(1,3-benzodithiole)s. A New Type of Electron Donors
Authors: Yamashita Yoshiro , Suzuki Takanori , Miyashi Tsutomu 
Published: May 2006

Abstract
The title compounds were prepared from quinoxaline-5,8-diones by using a Wittig-Horner reaction of 2-dimethoxyphosphinyl-1,3-benzodithiole and a retro Diels–Alder reaction. They are stronger donors than dibenzo-TTF and formed conductive complexes with TCNQ and iodine.
Studies on the Development of Anisotropy of Carbonaceous Materials. Comparison of Carbonization Behavior between Methylene Bridged Naphthalene Oligomer and Biphenyl One
Authors: Ida Toru , Nomura Masakatsu , Miyake Mikio , Akada Katsumi 
Published: May 2006

Abstract
Methylene bridged naphthalene oligomer was found to produce a carbonaceous material with optical anisotropy of a flow domain texture while corresponding biphenyl oligomer gave isotropic one. FD-MS measurements of oligomers and carbonized products revealed that the observed difference was originated from structural features whether condensed aromatic rings can develop or not.
A Flavin Receptor. Effect of 2,6-Diaminopyridine Derivatives on the Reduction of Benzo-Dipteridine (Oxidation-Active Flavin Model)
Authors: Yano Yumihiko , Tamura Norio , Mitsui Keita , Nabeshima Tatsuya 
Published: May 2006

Abstract
The Hamilton’s macrocyclic receptor for thymine was found to act also as a flavin receptor; it forms a complex with 7,14-diethylbenzo[1,2-g; 5,4-g′]dipteridine-2,4,9,11-(3H,7H,10H,14H)-tetrone (H-BDP) in CHCl3 and depresses slightly its oxidation activity.
Selective Synthesis of Unsymmetrical Biaryls via Palladium-Catalyzed Cross-Coupling of Arylfluorosilanes with Aryl Iodides
Authors: Hatanaka Yasuo , Fukushima Satoshi , Hiyama Tamejiro 
Published: May 2006

Abstract
In the presence of potassium fluoride, arylfluorosilanes readily participate in Pd-catalyzed cross-coupling reaction of aryl iodides to give the corresponding unsymmetrical biaryls in good yields.
Selective Partial Oxidation of Propane over Metal Phosphate Catalysts
Authors: Takita Yusaku , Yamashita Hisaomi , Moritaka Kenji 
Published: May 2006

Abstract
Catalytic oxidation of propane was studied over metal phosphates using propane rich feed. Oxidation reached measurable rate at 620–700 K over the catalysts. Over Cu2P2O7, Ni2P2O7, and LaPO4, propene, acetaldehyde, and methanol were principal products and the sum of these selectivities reached 70–80 mol%. Maximum selectivity of acrolein, 11.5 mol%, was observed over Mn2P2O7. Selectivity of propene reached 50.7 mol% over Co2P2O7. Deep oxidation was dominant over Cr4(P2O7)3, (ZrO)2P2O7, and CePO4.
α-Oxoketene Dithioacetals in Organic Synthesis. A New Access to 1-Siloxy-1,3-butadienes and Their Selective Reactions with Electrophiles
Authors: Tominaga Yoshinori , Kamio Chizuko , Hosomi Akira 
Published: May 2006

Abstract
Reactions of α-oxoketene dithioacetals with trimethylsilylmethylmagnesium chloride in the presence of cuprous iodide gave the corresponding 1-trimethylsiloxy-3-methylthio-1,3-butadienes selectively in excellent yields. 1-Siloxydienes react with various carbon electrophiles such as carbonyl compounds to furnish the desired dienones and 4-dihydropyrones selectively.
Enantiodivergent Route to the Aromatic Bisabolane Sesquiterpenes via a Chiral Acetylene Alcohol
Authors: Takano Seiichi , Sugihara Takumichi , Samizu Kiyohiro , Akiyama Masashi , Ogasawara Kunio 
Published: May 2006

Abstract
Efficient preparation and practical utilization of (R)-1-benzyloxy-3-butyn-2-ol have been established. Treatment of (2S,3S)-4-benzyloxy-2,3-epoxybutyl chloride, obtained via the Sharpless epoxidation, with n-butyllithium afforded (R)-1-benzyloxy-3-butyn-2-ol which could be transformed enantiodivergently into the key synthetic intermediates of the aromatic bisabolane sesquiterpenes.
Assimilatory and Dissimilatory Reductions of NOn− (n = 2, 3) Catalyzed by MoFeS Cluster
Authors: Tanaka Koji , Matsui Tatsuji , Tanaka Toshio 
Published: May 2006

Abstract
Nitrate and nitrite ions are selectively reduced to NH3 by a (Bu4N)4[MoFe3S4(SPh)3(O2C6Cl4)]2-modified glassy carbon electrode under the electrolysis at −1.25 V vs. SCE in H2O (pH 10.0), while nitrite ion is predominantly reduced to N2 under the same electrolysis at −1.00 V.
Synthesis of Atropisomeric 2,2′-Bis(dicyclohexylphosphino)-6,6′-dimethyl-1,1′-biphenyl (BICHEP) and Its Use in Rh(I)-catalyzed Asymmetric Hydrogenation of Prochiral Olefins
Authors: Miyashita Akira , Karino Haruhiko , Shimamura Jun-ichi , Chiba Takeshi , Nagano Katsuhiko , Nohira Hiroyuki , Takaya Hidemasa 
Published: May 2006

Abstract
The atropisomeric bis(dialkylarylphosphine) ligands, (R)-(−)- and (S)-(+)-2,2′-bis(dicyclohexylphosphino)-6,6′-dimethyl-1,1′-biphenyl (BICHEP) (1) have been newly synthesized, whose Rh(I) complexes are highly efficient catalysts for asymmetric hydrogenations of ethyl α-(benzamido)cinnamate and dimethyl itaconate in up to 98% yields and 98–99% enantiomeric excess.
Synthesis of a New Fucosidase Inhibitor, 1,5-Dideoxy-1,5-imino-L-talitol, via Cyanotrimethylsilanolysis of a β-D-Ribofuranoside and Its Inhibitory Activities
Authors: Hashimoto Hironobu , Hayakawa Michiya 
Published: May 2006

Abstract
A new polyhydroxypiperidine of L-talo configuration was synthesized from benzyl tri-O-benzyl-β-D-ribofuranoside via ring-cleavage reaction with cyanotrimethylsilane and found to be an effective fucosidase inhibitor (Ki 10−5–10−6 M).
Cobalt(II) Catalyzed Coupling Reaction of α,β-Unsaturated Compounds with Aldehydes by the Use of Phenylsilane. New Method for Preparation of β-Hydroxy Nitriles, Amides, and Esters
Authors: Isayama Shigeru , Mukaiyama Teruaki 
Published: May 2006

Abstract
A new crossed coupling reaction of α,β-unsaturated nitriles with aldehydes was performed by using phenylsilane and a catalytic amount of bis(1,3-diketonato)cobalt(II) to give β-siloxy nitriles in good yields. Similarly, α,β-unsaturated amides and esters also reacted under the same conditions to afford β-siloxy amides or esters. The present reaction provides a new and facile method for preparation of β-hydroxy nitriles, amides, and esters.
Isolation and Characterization of N,N-Disilylarenetellurenamides
Authors: Murai Toshiaki , Kimura Koji , Kato Shinzi 
Published: May 2006

Abstract
N,N-Disilylarenetellurenamides were prepared by the reaction of benzenetellurenyl iodide with lithium N,N-disilylamide and characterized for the first time.
Stability of Strongly Acidic Rare Earth Oxalate Solutions
Authors: Minagawa Yukinori , Yajima Fumikazu 
Published: May 2006

Abstract
Stability of strongly acidic rare earth (III) oxalate aqueous solutions was studied as a function of concentrations of oxalic acid, nitric acid, and rare earth (III) nitrate, RE(NO3)3, at 30 °C. Induction period, Id for precipitation of rare earth oxalate was given by Id = kRE [HNO3]T6 [RE(NO3)3]T−2 [H2C2O4]T−3, where subscript T indicates the total concentration and kRE is constant for rare earth metal ion. kRE values for Ce, Pr, Nd, Sm, Gd, Dy, Ho, Er, Yb, and Y were evaluated as 110, 14, 6.2, 2.5, 2.3, 4.8, 6.6, 13, 23, and 16/(10−6 sM), respectively. These results can be well explained by the simple precipitation theory based on solubility products of rare earth (III) oxalates.
Liquid Crystalline and Ferroelectric Properties of Tartrate with Two Chiral Centers
Authors: Ujiie Seiji , Iimura Kazuyoshi 
Published: May 2006

Abstract
A liquid crystalline chiral tartrate with p′-nitoazobenzene mesogenic moiety was found to show cholesteric and chiral smectic phases. In the chiral smectic phase, the tartrate exhibited the ferroelectric properties. The mode value of spontaneous polarization was 5 mC/m2 at 90 °C.
The First Asymmetric 1,3-Dipolar Cycloaddition of 1-Methyl-3-oxidopyridinium and (R)s-p-Tolyl Vinyl Sulfoxide. An Enantioselective Synthesis of (1S)-(−)-2α-Tropanol
Authors: Takahashi Tamiko , Kitano Kazuyoshi , Hagi Toru , Nihonmatsu Hiroko , Koizumi Toru 
Published: May 2006

Abstract
The first enantioselective synthesis of (1S)-(−)-2α-tropanol, which has the opposite absolute configuration to that of natural cocaine, was achieved by an asymmetric 1,3-dipolar cycloaddition of (R)s-p-tolyl vinyl sulfoxide and 1-methyl-3-oxidopyridinium.
Regioselective 1,4-Functionalization of 1,3-Dienes via (η3-1-Acetonylallylic)Fe(CO)2NO Complexes
Authors: Itoh Keiji , Nakanishi Saburo , Otsuji Yoshio 
Published: May 2006

Abstract
1,4-Acylation-alkylation of 1,3-dienes occurred regioselectively via (η3-1-acetonylallylic)Fe(CO)2NO complexes upon treatment of 1,3-dienes with iodomethane in the presence of Bu4NFe(CO)3NO and then with carbon nucleophiles or carbon electrophile.
Synthesis of Colorless (6/5)-Molybdophosphonate, Na2H5[(C2H5)4N]3(HP)5Mo6O33
Authors: Himeno Sadayuki , Hori Toshitaka , Saito Atsuyoshi 
Published: May 2006

Abstract
The title compound was isolated from a 0.15 M (= mol/dm3) Mo(VI)/0.3 M H3PO3/0.1 M HCl/60% (v/v) CH3COCH3 system. The existence of a new type of heteropoly complex with a composition of Mo/P = 6/5 was elucidated. The formation conditions and the IR spectroscopic characteristics were compared with those of well-established pentamolybdodiphosphonate.
Dehydrogenation of Cyclohexanol to Cyclohexanone on Supported Nickel Catalysts
Authors: Uemichi Yoshio , Sakai Takeshi , Kanazuka Takaji 
Published: May 2006

Abstract
Nickel supported on activated carbon was highly active as a catalyst for the dehydrogenation of cyclohexanol to cyclohexanone. The activity of nickel catalysts strongly depended on the support; activated carbon was most efficient, while silica, alumina and magnesia were much less effective.
Strain-Assisted, Unusually Facile Hydrolysis of the Nitrogen-Bridge of a Tricyclic Uracil N-Cyclonucleoside
Authors: Minamoto Katsumaro , Azuma Kishiko , Hoshino Yorihisa , Eguchi Shoji 
Published: May 2006

Abstract
With respect to “up” amination of the sugar part of nucleosides through an appropriate N-cyclonucleoside, 5′,N-anhydro-2,2′-imino-1-(2′-deoxy-β-D-arabinofuranosyl)uracil proved to be easily hydrolyzed to 1-(2′,5′-N-anhydro-5′-amino-2′,5′-dideoxy-β-D-arabinofuranosyl)uracil (2) in dilute alkaline or acidic medium. 2 was characterized as its acetylimino analogue or hydrochloride, and proved to trans form to 5′,N-anhydro-6,2′-imino-1-(2′-deoxy-β-D-arabinofuranosyl)-5,6-dihydrouracil spontaneously.
Photoinduced Cross Coupling Reaction of Covalently Linked Tyrosine-Pyropheophorbide a and Tyrosine-9-Desoxomesopyropheophorbide a to 1,4-Benzoquinone
Authors: Maruyama Kazuhiro , Yamada Hiroko , Osuka Atsuhiro 
Published: May 2006

Abstract
Irradiation of tyrosine-linked pyropheophorbide a and 1,4-benzoquinone (BQ) in benzene led to a clean formation of a quinone-linked product, while photoreaction of 9-desoxomesopyropheophorbide a and BQ produced a quinone-linked 9-desoxomesopyropheophorbide a and a quinone-linked 9-desoxophylloerythrin a.
Conductive Langmuir–Blodgett Film Containing Mesogenic Unit. Phase Transition Accompanied with the Change in Conductivity
Authors: Tachibana Hiroaki , Komizu Hideo , Nakamura Takayoshi , Matsumoto Mutsuyoshi , Tanaka Motoo , Manda Eiichiro , Kawabata Yasujiro , Kato Teiji 
Published: May 2006

Abstract
Conductive Langmuir–Blodgett films of charge transfer complex containing azobenzene group in the hydrophobic part exhibited a sharp discontinuity in the temperature dependent conductivity. This discontinuity was accompanied with the change in the aggregation form and the morphology of the films.
Preparation and Properties of Thallium Ferrite with β-Alumina Structure
Authors: Nariki Shinya , Ito Shigeru , Uchinokura Katsumi , Yoneda Noboru 
Published: May 2006

Abstract
Thallium ferrite with β-alumina structure was prepared by exchanging K+ ions in K+-β-ferrite crystals with Tl+ ions into TlNO3 melt. The lattice constants were a = 0.5931 nm and c = 2.389 nm. The ionic conductivity of Tl+-β-ferrite was 3 × 10−2 S·cm−1 at 300 °C.
Optical Resolution of Pantolactone by Inclusion Crystallization with (R,R)-(−)-trans-2,3-Bis(diphenylhydroxymethyl)-1,4-dioxaspiro[4.5]decane, and Crystal Structure of the Resulting 1:1 Complex
Authors: Toda Fumio , Sato Atsushi , Tanaka Koichi , Mak Thomas C W 
Published: May 2006

Abstract
Pantolactone was resolved very efficiently by complex formation of its (S)-(−) isomer with the title host compound. The structure of the 1:1 complex was elucidated by X-ray crystallography.
Convenient Synthesis of Disubstituted Cyclic Ethers. Syntheses of (−)-cis-Rose Oxide and (cis-6-Methyltetrahydropyran-2-yl)acetic Acid
Authors: Homma Koichi , Mukaiyama Teruaki 
Published: May 2006

Abstract
Disubstituted cyclic ethers are stereoselectively prepared on the successive treatment of δ or ε-lactones with t-butyldimethylsiloxy-1-ethoxyethene and silyl nucleophiles in the presence of a catalytic amount of trityl hexachloroantimonate or a catalyst system of antimony pentachloride, chlorotrimethylsilane and tin(II) iodide. The present procedure is effectively applied to short syntheses of (−)-cis-rose oxide and (cis-6-methyltetrahydropyran-2-yl)acetic acid, a constituent of civet.
Orientation and Distribution of the Carbazole Unit in Monolayers and Their Fluorescence Characteristics
Authors: Kimizuka Nobuo , Tsukamoto Masashi , Kunitake Toyoki 
Published: May 2006

Abstract
Double-chain ammonium amphiphiles that contain the carbazole ring formed stable monolayers on water. Their fluorescence patterns indicated different packing modes of the chromophore which depended on chemical structure and component distribution.
Interglucosyl Attack of Hydroxyl Group to Epoxy Ring of 2A,3A-Anhydro-(2AS)-α-cyclodextrin. Selective Preparation of 3A,2B-Anhydro-α-cyclodextrin
Authors: Fujita Kahee , Tahara Tsutomu , Sasaki Hideaki , Egashira Yoshimitsu , Shingu Tetsuro , Imoto Taiji , Koga Toshitaka 
Published: May 2006

Abstract
2A,3A-Anhydro-(2AS)-α-cyclodextrin was isomerized exclusively to 3A,2B-anhydro-α-cyclodextrin by the reaction with aqueous alkali. This implies the selective and interglucosyl attack of 3F-OH to the epoxy ring.
Synthesis of Novel Tetraazapentalene Derivatives with Fused Cyclic Systems
Authors: Matsumura Noboru , Tomura Masaaki , Chikusa Hisashi , Mori Osamu , Inoue Hiroo 
Published: May 2006

Abstract
Tetraazapentalene derivatives (R = CH3, CH2=CHCH2) reacted with ω-halogenoalkyl isothiocyanates to give novel tetraazapentalene derivatives with fused cyclic systems in good yields.
A Facile and Convenient Synthesis of (E,E)-4-Trifluoroacetyl-1,3-butadienyl Sulfides by Acid Catalyzed Reaction of 2,4-Diethoxy-6-trifluoromethyl-3,4-dihydro-2H-pyran with Thiols
Authors: Hojo Masaru , Masuda Ryoichi , Okada Etsuji 
Published: May 2006

Abstract
(E,E)-4-Trifluoroacetyl-1,3-butadienyl sulfides are prepared from 2,4-diethoxy-6-trifluoromethyl-3,4-dihydro-2H-pyran with thiols in the presence of acid catalysts.
Electron Energy-Loss Spectrum of Methanol. Observation of Singlet-Triplet Transitions at Low Incident Energy
Authors: Ogawa Teiichiro , Yoshidome Toshifumi , Kawazumi Hirofumi 
Published: May 2006

Abstract
The electron energy-loss spectrum of methanol was measured at incident electron energies from 100 to threshold +2 eV. There were several intense bands assignable to the Rydberg transitions. Three singlet-triplet transitions were observed at 5.7–7.0, 7.3–7.6 and 8.8–9.5 eV at low incident electron energies.
Synthesis of a Negatively-charged Porphinatoiron(II) Having a Phosphoserine Group and Oxygenation in Phospholipid Bilayer
Authors: Hasegawa Etsuo , Fukuzumi Masaki , Nishide Hiroyuki , Tsuchida Eishun 
Published: May 2006

Abstract
A new tetraphenylporphinatoiron(II) having only one amphiphilic chain with a phosphoserine group as a hydrophilic end group was synthesized. The complex with 1-dodecyl-2-methylimidazole embedded in phospholipid bilayer formed an oxygen adduct and the oxygen-binding rate constant was much smaller than that of the heme having four amphiphilic chains.
Catalytic Asymmetric Aldol Reaction of Silyl Enol Ethers with Aldehydes by the Use of Chiral Diamine Coordinated Tin(II) Triflate
Authors: Mukaiyama Teruaki , Kobayashi Shu , Uchiro Hiromi , Shiina Isamu 
Published: May 2006

Abstract
Highly enantioselective aldol reaction of silyl enol ethers with aldehydes is performed by the use of a catalytic amount of chiral diamine coordinated tin(II) triflate according to a slow addition procedure.
Nitro–Nitrito Isomerization Induced by Oxidation-Reduction of Central Metal Site: [RuII(NO2)(H2O)(py)4]+ →← [RuIV(ONO)(O)(py)4]+
Authors: Nishimura Hisatoshi , Nagao Hirotaka , Howell F Scott , Mukaida Masao , Kakihana Hidetake 
Published: May 2006

Abstract
Nitro–Nitrito isomerization occurs reversibly when a formal oxidation state of the central metal atom is changed; a nitro complex of Ru(II) gives a nitrito complex of Ru(IV), which is capable of being returned to the original complex by a moderate reduction.
Facile Synthesis of 1,1′-Binaphthyl-2-carboxylates via Nucleophilic Aromatic Substitution of 1-Methoxy-2-naphthoic Esters by 1-Naphthyl Grignard Reagents
Authors: Hotta Hiroki , Suzuki Takatsugu , Miyano Sotaro 
Published: May 2006

Abstract
Grignard reagents formed from 1-bromonaphthalenes smoothly displaced the 1-methoxyl group of 1-methoxy-2-naphthoic esters to provide a facile route to 1,1′-binaphthyl-2-carboxylic acids in excellent yields; the reaction of (S)-1-phenylethyl esters caused asymmetric induction in the joining of the two naphthalene rings in up to 51% optical yield.
A Short Synthesis of (±)-3-Oxosilphinene
Authors: Ue Masaki , Ohnishi Yutaka , Kobiro Kazuya , Kakiuchi Kiyomi , Tobe Yoshito , Odaira Yoshinobu 
Published: May 2006

Abstract
A total synthesis of (±)-3-oxosilphinene was achieved stereoselectively in five steps from the known enone.
A Key Intermediate for the Chiral Synthesis of Elemanoids, Synthesis of (+)-β-Elemenone
Authors: Kato Michiharu , Vogler Bernhard , Tooyama Youichi , Yoshikoshi Akira 
Published: May 2006

Abstract
(1R,5S)-3-Phenylsulfenyl-6,6-dimethylbicyclo[3.1.1]heptanone obtained from (+)-nopinone was transformed into (1R,4S,5S)-4-methyl-4-vinylbicyclo[3.1.1]heptan-2-one, whose cyclobutane ring was cleaved with BF3·EtO2–Zn(OAc)2 in acetic anhydride to provide (4S,5S)-1-acetoxy-4-isopropenyl-5-methyl-5-vinyl-1-cyclohexene (5), the key intermediate, in a highly regio- and stereoselective manner. Regioselective introduction of a three-carbon unit to 5 with acetone followed by dehydration yielded (+)-β-elemenone.
Three New Germacranolide Glycosides from Pittosporum tobira Ait
Authors: Nozaki Hiroshi , Takaoka Daisuke , Nakayama Mitsuru 
Published: May 2006

Abstract
Three new germacranolide glycosides, pittosporanoside B1, B2 and B3, have been isolated from Pittosporum tobira Ait, and their structures have been determined by spectral and X-ray crystallographic analyses.
Preparation of Silica Fibers from Sodium Silicate Solution
Authors: Tada Akio , Yaginuma Hiromi , Itoh Hidenobu , Hirota Tamotu , Maeda Toshiyuki 
Published: May 2006

Abstract
Silica fibers were prepared from sodium silicate solution. A spinnable sol was obtained by the reaction of a sodium silicate solution with ethyl acetate, and gel fibers obtained by dry spinning of this sol were converted to silica fibers by treating in an acid bath followed by drying at 100 °C and heating at 600 °C.
Mechanism of Second-Order Buffer Catalysis in the Hydrolysis of Methoxymethyl Benzenesulfenate
Authors: Okuyama Tadashi , Gandour Richard D , Fueno Takayuki 
Published: May 2006

Abstract
Hydrolysis of methoxymethyl benzenesulfenate is catalyzed by both acid and base. Rates depend on a second order of buffer concentration, which results from general acid-promoted nucleophilic attack by the base at the proformyl carbon.
A Selective Formation of Styrene by Oxidative Methylation of Toluene with Methane over a PbO/MgO Catalyst
Authors: Osada Yo , Okino Nobutaka , Ogasawara Sadao , Fukushima Takakazu , Shikada Tsutomu , Ikariya Takao 
Published: May 2006

Abstract
The oxidative methylation of toluene with methane to styrene was studied using a lead oxide supported on magnesia catalyst. Although coke deposits were observed on the catalyst, it was found that a high selectivity of 41% for styrene was stably obtained at 40% toluene conversion over 1 g of 20 wt% PbO/MgO catalyst at 973 K.
Selective Hydrogenation of 9-Aminoacridine over Supported Noble Metal Catalysts
Authors: Sakanishi Kinya , Mochida Isao , Okazaki Hiroshi , Soeda Mahito 
Published: May 2006

Abstract
The selective hydrogenation of 9-aminoacridine(1) into 1,2,3,4-tetrahydro-derivative(2) was searched using noble metal catalysts(Pd, Rh, Pt, and Ru) at around 80 °C and 60 °C atm of H2. The Pd/Al2O3 catalyst was found most selective to produce 2 in a higher yield of 60% at a conversion of 97%. The hydrogenation pathway of 1 is discussed in comparison with that of acridine.