bluuebunny/crossref_metadata_2025_split huggingface dataset:
Laser Photolysis Study on the Duroquinone-photosensitized Isomerization of Stilbenes in Micellar Solution
Authors: Tanimoto Yoshifumi , Takayama Masanari , Shima Sayaka , Itoh Michiya 
Published: July 2006

Abstract
Photoinduced electron-transfer reaction between the excited triplet duroquinone and trans- and cis-stilbenes generates trans-stilbene cation radical in SDS micellar solution, suggesting that the cis-trans isomerization of stilbene occurs via an electron-transfer mechanism.
Ring Transformation of 1,4 (or 1,6)-Disubstituted 3,5-Dinitro-2-pyridones with Sodio β-Keto Esters
Authors: Ariga Masahiro , Tohda Yasuo , Matsumura Eizo 
Published: July 2006

Abstract
The ring transformation of 1,6-dimethyl-, 1,4-dimethyl- and 4-methoxy-1-methyl-3,5-dinitro-2-pyridones with sodio β-keto esters to nitrosalicylic esters was investigated concerning the electronic effects of 4 and 6-substituents. The results were explained by the HSAB principle.
59Co Quadrupole Effects on the 1H, 31P, and 59Co NMR Spectra of HFeCo3(CO)9[P(OCH3)3]3 and the 1H NMR Spectra of Other Derivatives
Authors: Saito Taro , Sawada Satoshi 
Published: July 2006

Abstract
The 1H NMR spectra of HMCo3(CO)12 (M=Fe or Ru) and HFeCo3(CO)12−x[P(OR)3]x (x=1–3, R=CH3; x=3, R=C2H5 or C6H5) showed very broad signals centered near δ=−21 at 27 °C. The band widths were generally smaller for the compounds of larger molecular volume, at lower temperatures and with higher viscosity of the solvent. These data were interpreted in terms of the quadrupole effects of 59Co nuclei to which the hydride proton was μ3-bonded. Supporting evidence was obtained from the 31P and 59Co NMR spectra and the relaxation time T1 of HFeCo3(CO)9[P(OCH3)3]3.
Synthesis of Hg(II) Complexes of Cysteine-Containing Oligopeptides
Authors: Ueyama Norikazu , Nakata Michio , Nakamura Akira 
Published: July 2006

Abstract
Tetrapeptides, Z–Cys–Ala–Ala–Cys–OMe(Z=benzyloxycarbonyl), Z–Cys–Val–Val–Cys–OMe, and Z–Cys–Gly–Pro–Cys–OMe, having Cys–X–Y–Cys sequences were synthesized by using an acetamidomethyl (Acm) protecting group. The Hg(II) complexes of these peptides, Hg2Cl2(Z–Cys–Ala–Ala–Cys–OMe) 1. Hg(Z–Cys–Ala–Ala–Cys–OMe) 2, Hg2Cl2(Z–Cys–Gly–Pro–Cys–OMe) 3, Hg(Z–Cys–Val–Val–Cys–OMe) 4, and Hg2Cl2(Z–Cys-Ala-Cys–OMe) 5 were synthesized by the reaction of the S(Acm) protecting peptides and HgCl2 in N,N-dimethylformamide. Two Raman bands due to Cl–Hg–S of 1, 3, or 5 were observed at 314, 281, or 276 cm−1 in solid, whereas a single band due to S–Hg–S was found at 326 cm−1 for 2 or 327 cm−1 for 4, in solid.
Selective Hydrogenation of Cyclooctadienes Using Colloidal Palladium in Poly(N-vinyl-2-pyrrolidone)
Authors: Hirai Hidefumi , Chawanya Hitoshi , Toshima Naoki 
Published: July 2006

Abstract
Selective hydrogenation of 1,3-, 1,4-, and 1,5-cyclooctadiene to cyclooctene was carried out at 30 °C under atmospheric hydrogen pressure using colloidal palladium which was prepared by reducing palladium(II) chloride with refluxing methanol in the presence of poly(N-vinyl-2-pyrrolidone). The yields of cyclooctene were 99.9% and 97.8% for hydrogenation of 1,3- and 1,5-cyclooctadiene, respectively at the point that an equimolar hydrogen was uptaken by cyclooctadienes. The hydrogenation rate of 1,3- and 1,4-cyclooctadiene (R1) is expressed as R1=k1[H2][Pd], and that of 1,5-cyclooctadiene (R2) is expressed as R2=k2[H2]0.7[Pd], where k1 and k2 are the rate constants. Alcohols were found to be good solvents for hydrogenation. In particular the fastest rate and the highest selectivity for monoene were observed in methanol among the solvents examined. Effect of bases on the monoene selectivity has also been investigated.
The Thermal Cis-to-trans Isomerization of N,N′-Diacylindigos. Kinetic Pressure, Solvent, and Substituent Effects
Authors: Sueishi Yoshimi , Ohtani Kazuo , Nishimura Norio 
Published: July 2006

Abstract
The kinetics of the thermal cis-to-trans isomerization of N,N′-diacylindigos(DAI) in various solvents and under high pressures has been studied. N,N′-Dibenzoylindigos(DBI) isomerize about 10 times slower than molecules not having a benzene ring in the acyl groups. The values of the activation volumes were about 8.0 cm3 mol−1 for the former and about 3.0 cm3 mol−1 for the latter. It was suggested that the thermal isomerization proceeds via the biradical mechanism. The positive values of the activation volume have been interpreted in terms of the increase in the intrinsic volume upon activation. The differences in the isomerization rates and the activation parameters between DBI and the others have been ascribed to an additional interaction between the two phenyl rings in the acyl groups in the cis-ground state.
Studies on the G(Fe3+→Fe2+)-value in the Radiolysis Caused by 6Li(n,α)T Reaction in Lithium Tris(oxalato)ferrate(III)
Authors: Akashi Junko , Kojima Tomoko , Uchida Yoshio , Sano Hirotoshi 
Published: July 2006

Abstract
The G-values for the reduction of iron(III) to iron(II) state caused by 6Li(n,α)T reaction in Li3[Fe(C2O4)3]·4.5H2O and in anhydrated Li3[Fe(C2O4)3] were determined by taking into account the saturation of the effect of increasing neutron fluence. The contribution of the fast neutrons and γ-rays in a nuclear reactor to the reduction was estimated by using a cadmium tube, and by using the results estimated in the 60Co γ-ray irradiation, respectively. The G(Fe3+→Fe2+)-value in the radiolysis caused by 6Li(n,α)T reacation in Li3[Fe(C2O4)3]·4.5H2O is larger than that in the γ-ray radiolysis, and is also larger than the G-value for anhydrated Li3[Fe(C2O4)3], suggesting that the radiolysis of the water of crystallization contributes to the reduction of the iron(III) species.
Isomerization of Allylic Alcohols Catalyzed by Vanadium or Molybdenum Complexes
Authors: Matsubara Seijiro , Okazoe Takashi , Oshima Koichiro , Takai Kazuhiko , Nozaki Hitosi 
Published: July 2006

Abstract
Isomerization of primary allylic alcohols proceeds in dichloromethane at 25 °C in the presence of the catalyst prepared in situ from VO(acac)2 or MoO2(acac)2, and Me3SiOOSiMe3 to give tertiary isomers in good yields. The catalysts are also effective for the rearrangements of sec.→tert. allylic alcohols. The isomerization of an allenyl allylic alcohol, 6-methyl-1,2,5-heptatrien-4-ol, gives either (E)-2-methyl-3,5,6-heptatrien-2-ol or (E)-6-methyl-3,5-heptadien-2-one selectively depending on the reaction conditions.
Structural, Magnetic and IR Spectroscopic Characterization of Dimeric Copper(II) Trichloroacetate Adduct with Benzonitrile. Nature of the Copper(II)–Bezonitrile Bond
Authors: Nakashima Michio , Mikuriya Masahiro , Muto Yoneichiro 
Published: July 2006

Abstract
The benzonitrile adduct of copper(II) trichloroacetate, [Cu(Cl3CCOO)2(PhCN)]2, was prepared and characterized. The dimeric structure was confirmed by an X-ray structural determination. This compound crystallizes in the triclinic space group P\bar1 with a=12.780(1), b=16.064(1), c=10.130(1) Å; α=108.39(1), β=113.34(1), γ=81.07(1)°. The crystal consists of two crystallographically independent dimeric units. Both units have the familiar dimeric copper(II) acetate monohydrate structure with Cu–Cu distances of 2.731(1) and 2.732(1) Å. Magnetic susceptibility data in the range of 80–300 K are well represented by the usual dimer equation with a singlet-triplet energy separation of −2J=224 cm−1. The C≡N stretching frequency of benzonitrile in the compound shows an increase by 31 cm−1 from the free ligand value. On the basis of the X-ray crystallographic and IR spectroscopic results, the nature of the copper(II)–benzonitrile bond is discussed. For discussion magnetic and spectroscopic properties of some analogous nitrile adducts of copper(II) chloroacetates were also studied.
Synthetic Inorganic Ion-exchange Materials. XXXVII. Ion-exchange Behaviors of Alkylammonium Ions on Hydrous Titanium Dioxide
Authors: Tsuji Masamichi , Abe Mitsuo , Orimo Minoru 
Published: July 2006

Abstract
Ion-exchange behavior of alkali hydroxide and alkylamines having different sizes and forms on hydrous titanium dioxide ion exchanger (HTDO) were studied. The uptakes of all the cations by HTDO indicated the ion-exchange stoichiometry at a pH range studied. The pH titration curves vary, depending on the cation species and the strength of the bases used: amorphous HTDO(Am-HTDO) behaves as a bifunctional acid towards strong bases and as a monofunctional acid towards weak bases. Am-HTDO shows an affinity series in the increasing order: large ions((C2H5)3NH+, (CH3)4N+, and (n-C4H9)4N+)&lt;ions in medium size (CH3NH+, n-C3H7NH3+, n-C4H9NH3+ etc.)&lt;small ions(Na+, K+, and NH4+). The large ions suffer from a strong steric effect, because of the limited space of the ion-exchange site available. The results correlate with the pore size distribution: the pore radius ranged from 4 to 7 Å in Am-HTDO degassed at 40 °C by a rotary pump. The maximum volume occupied by the alkylammonium ions exchanged (0.2–0.3 cm3/g), calculated by assuming cations to be unhydrated, is in good agreement with the value determined by N2 gas adsorption (0.16 cm3/g). An anatase-type HTDO showed a larger steric effect for uptake of the alkylammonium ions than that by the Am-HTDO, due to a decrease in the ion-exchange cavity.
The Syntheses of the Corticoid Side Chain. I. An Improved Method for the Preparation of 17α-Hydroxyprogesterone from Androst-4-ene-3,17-dione
Authors: Nitta Issei , Fujimori Shinichiro , Ueno Hiroaki 
Published: July 2006

Abstract
The 17β-cyano-17α-hydroxyandrost-4-en-3-one can be prepared from androst-4-ene-3,17-dione in an excellent yield. This derivative can be converted into 17α-hydroxyprogesterone, an intermediate of corticosteroids.
The Syntheses of the Corticoid Side Chain. III. A New Synthesis of 17α,21-Dihydroxypregna-1,4-diene-3,20-dione 17,21-Diacetate from Androsta-1,4-diene-3,17-dione
Authors: Nitta Issei , Fujimori Shinichiro , Haruyama Toshio , Inoue Shinya , Ueno Hiroaki 
Published: July 2006

Abstract
An efficient synthesis of 17α,21-dihydroxypregna-1,4-diene-3,20-dione 17,21-diacetate (10) from androsta-1,4-diene-3,17-dione (1), a biodegradation product of cholesterol, is described, which involves the ethynylation of the 17-ketone, the epimerization of the 17α-ethynyl group and conversion of the ethynyl group to the 20-keto pregnane. Overall yield is relatively high (about 54%) and 10 will be a potential intermediate for prednisolone.
An X-Ray Diffraction Investigation of the Coordination Structure of Mn(II) Ions in Highly Concentrated Aqueous MnBr2 and MnCl2 Solutions
Authors: Tajiri Yoshichika , Ichihashi Mitsuyoshi , Mibuchi Takeharu , Wakita Hisanobu 
Published: July 2006

Abstract
The solute structures of highly concentrated aqueous 5.087 and 2.744 mol dm−3 MnBr2, and 4.744 and 2.732 mol dm−3 MnCl2 solutions were determined by the analysis of the radial-distribution function curves of X-ray diffraction experiments. Mixed-ligand aquahalogenomanganese(II) complexes were found to be present in these solutions, holding a distorted octahedral geometry. The interatomic distances of the aquabromo complex are 2.178–2.184 Å for Mn–OH2 and 2.596–2.643 Å for Mn–Br; those of the aquachloro complex are 2.183–2.185 Å for Mn–OH2 and 2.492–2.496 Å for Mn–Cl. The interatomic distances of Mn–OH2 are shorter than those of the MnBr2·4H2O and MnCl2·4H2O crystals and are consistent with those of the Mn(OH2)6(NO3)2 crystal. The length of the Mn–Cl bond here determined is practically the same as that within the MnCl2·4H2O crystal, but the Mn–Br bond found is shorter than that within the MnBr2·4H2O crystal. The average coordination number of the Mn–Br contact per Mn(II) increased from 1.104 to 1.212 with an increase in the Br/Mn ratio from 2.076 to 3.269, while the number of the Mn–Cl contact per Mn(II) increased from 1.259 to 1.501 with an increase in the Cl/Mn ratio from 2.000 to 3.352. In all solutions, the aquamonohalogeno and aquadihalogeno complexes exist as the main species, but the aquadihalogeno complex is more dominant in the MnCl2 solution than in the MnBr2 solution.
Reciprocal Space Expansion in the Analysis of X-Ray Scattering Intensities from Liquid Carbon Tetrachloride
Authors: Nishikawa Keiko , Iijima Takao 
Published: July 2006

Abstract
The concept of “reciprocal space expansion” has been applied in the analysis of the X-ray scattering intensity from liquid carbon tetrachloride. The results obtained by using the bcc local lattice structure model show very good agreement with the experimental intensity in the small-s region, where ghost peaks are inevitably introduced by the “real space expansion” usually adopted.
The Studies on the Hydration Energy and Water Structures in Dilute Aqueous Solution
Authors: Moon Myung Jun , Jhon Mu Shik 
Published: July 2006

Abstract
Thermodynamic properties of dilute aqueous solutions are influenced by the interactions between ions and water molecules as well as the change of the water structure around the ion. To obtain hydration energies of monoatomic ions and local water structures around the ions, we make use of the discrete-continuum method. The calculated values for the hydration energies of ions are in good agreement with experimental values. The hydration energies of monoatomic cations can be qualitatively correlated with the sum of the successive ionization potentials from its atomic state to the ionic state. From their correlations, we can classify various ions as three groups. It is also found that the main factors which determine the stability of water structures around the ions are the charges and dimensions of ions.
Chemical Synthesis and Biological Activities of Two Disaccharide Dipeptides Corresponding to the Repeating Units of Bacterial Peptidoglycan
Authors: Kusumoto Shoichi , Yamamoto Koji , Imoto Masahiro , Inage Masaru , Tsujimoto Masachika , Kotani Shozo , Shiba Tetsuo 
Published: July 2006

Abstract
Two disaccharide dipeptides, i.e., O-(N-acetyl-β-d-glucosaminyl)-(1→4)-N-acetylmuramyl-l-alanyl-d-isoglutamine (2) and O-(N-acetyl-β-muramyl-l-alanyl-d-isoglutamine)-(1→4)-N-acetyl-d-glucosamine (3), which correspond to partial structures of cell wall peptidoglycan were synthesized via the same glucosamine disaccharide as a common intermediate. Thus, selective introduction of lactic acid moiety on either one of the sugar moieties of the intermediate gave two disaccharides respectively which contain muramic acid on either reducing or nonreducing side. Coupling of the peptide moiety followed by deprotection afforded 2 and 3. The results of biological tests showed that both 2 and 3 have the same magnitude of immunostimulating activities as those of N-acetylmuramyl-l-alanyl-d-isoglutamine which is the minimum structure required for expression of the activities.
Acid-Dissociation Behavior of para-Hydroxyl Group in the N,N,O-Terdentate Ligand, 4-(4-Methyl-2-pyridylazo)resorcinol, Coordinated to a Transition Metal Ion
Authors: Kudo Yoshihiro , Yoshida Noboru , Fujimoto Masatoshi , Tanaka Katsumi , Toyoshima Isamu 
Published: July 2006

Abstract
The acid-dissociation behavior of 1:1 and 1:2 complexes of transition metals with an N,N,O-terdentate ligand, 4-(4-methyl-2-pyridylazo)resorcinol (4-Me PAR), is spectrophotometrically studied in ethanol at 25 °C. The values of apparent pKa of the p-hydroxyl group of the ligand in the metal complexes are found to be in the order, Pd(II)&lt;Co(III)&lt;Ni(II)&lt;Mn(II). The electronic structures of the p-hydroxyl oxygen atoms in the solid complexes of Mn(II), Ni(II), Pd(II), and Co(III) are examined on the basis of the data of X-ray photoelectron spectroscopy (XPS). The decrease in the electron density on the p-hydroxyl oxygen atom caused by the inductive effect through the azo nitrogen and the benzene ring of the coordination of the ligand to the central metal atom is larger in the Pd(II) and Co(III) complexes compared with that in the Ni(II) and Mn(II) complexes.
The Synthesis, Magnetic, and Spectroscopic Properties of Binuclear Iron(III) Complexes Bridged by Pyrazine, 1,1′-Tetramethylenebis(imidazol), or Bis(pyridine) Compounds Exhibiting a Spin-Equilibrium Behavior
Authors: Ohta Shoichi , Yoshimura Chikako , Matsumoto Naohide , Okawa Hisashi , Ohyoshi Akira 
Published: July 2006

Abstract
Five binuclear iron(III) complexes bridged by pyrazine, 1,1′-tetramethylenebis(imidazol), or bis(pyridine) compounds with the formula of [LFe(Bge)FeL](BPh4)2 have been prepared, and their spin-equilibrium behavior between high-spin(S=5/2) and low-spin(S=1/2) states has been investigated by means of the temperature dependences of the magnetic susceptibilities and the electronic spectra, where Bge denotes pyrazine, 1,1′-tetramethylenebis(imidazol), 4,4′-bipyridine, 4,4′-ethylenebis(pyridine), or 4,4′-vinylenebis(pyridine), L=bis(3-salicylideneaminopropyl)amine, and BPh4−=tetraphenylborate. The pyrazine complex is low-spin, while the bis(imidazole) and the bis(pyridine) complexes snowed a spin-equilibrium between high-spin and low-spin states, accompanied by a striking thermochromism in both the solids and solutions.
Structure Determination of Shinjulactones M and N, New Bitter Principles from Ailanthus altissima SWINGLE
Authors: Niimi Yoshio , Tsuyuki Takahiko , Takahashi Takeyoshi , Matsushita Kazuhiro 
Published: July 2006

Abstract
Two new quassinoids, shinjulactones M and N were isolated from root bark of Ailanthus altissima SWingle. The structures of these compounds were determined to be 11β,20-epoxy-1β,11α,12α,13β,21-pentahydroxypicras-3-ene-2,16-dione and 11β,20-epoxy-1β,2α,11α,12α,15β-pentahydroxypicrasa-3,13(21)-dien-16-one, respectively, by spectral and chemical means.
Photochemical Reaction of 2,3-Dichloro-1,4-naphthoquinone with Enol Silyl Ethers
Authors: Maruyama Kazuhiro , Tai Seiji , Imahori Hiroshi 
Published: July 2006

Abstract
2-Oxoalkylated 1,4-naphthoquinones were obtained in the photochemical reactions of 2,3-dichloro-1,4-naphthoquinone with 2-trimethylsiloxy-1-alkenes. Application of this method afforded a wide variety of functionalized 2-oxoalkylated 1,4-naphthoquinones. The photochemical reactions of 2,3-dichloro-1,4-naphthoquinone with 1-alkyl-2-(trimethylsiloxy)ethylenes gave naphthol derivatives. However, 1,1-dialkyl-2-(trimethylsiloxy)ethylenes gave none of products.
Reactions of α-Polyhalo Ketone Tosylhydrazones with Sulfide Ion and Primary Amines. Cyclization to 1,2,3-Thiadiazoles and 1,2,3-Triazoles
Authors: Sakai Kunikazu , Hida Nobuko , Kondo Kiyosi 
Published: July 2006

Abstract
Trichloroacetaldehyde tosylhydrazone acts as an excellent precursor of diazodithioacetate which is generated by treatment of the hydrazone with sulfide ion. This spontaneously cyclizes it to 5-mercapto-1,2,3-thiadiazole. The precursor also gives a 5-amino-1,2,3-triazole on reaction with an amine. α,α-Dichloro ketone tosylhydrazones similarly cyclize to give 1,2,3-thiadiazoles and 1,2,3-triazoles.
A High-Resolution Solid-State 23Na NMR Study of Sodium Complexes with Solvents, Small Ligand Molecules, and Ionophores. 23Na Chemical Shifts as Means for Identification and Characterization of Ion–Ion, Ion–Solvent, and Ion–Ligand Interactions
Authors: Tabeta Ryoko , Aida Misako , Saitô Hazime 
Published: July 2006

Abstract
We have recorded static and magic angle spinning (MAS) 23Na NMR spectra of a variety of inorganic salts, solvent complexes, and complexes with small ligand molecules and ionophores in the solid state, in order to obtain the 23Na chemical shifts of the ion–ion, ion–solvent, and ion–ligand interactions, respectively. In all cases, MAS resulted in considerable reduction of the linewidths. The observed 23Na chemical shifts were corrected by subtracting the displacements by the quadrupole interaction when the quadrupole coupling constants cannot be ignored. We found that the range of the 23Na chemical shifts found in the solid state is about 60 ppm and the 23Na chemical shift of NaBPh4 appears at the highermost region (−52 ppm). The 23Na NMR chemical shifts of these complexes exhibited their characteristic peak positions, depending on variety of ligand molecules (H2O, ether, or carbonyl) and Na–O interatomic distances but independent of the type of counterion. Finally, an attempt was made to relate the 23Na chemical shifts to the magnitude of electron transfer from the ligand molecules to 3p orbital of Na+ ion, by means of an ab initio molecular orbital method.
Syntheses of Althiomycin Analogs in Relation to Antibacterial Activities
Authors: Inami Kaoru , Shiba Tetsuo 
Published: July 2006

Abstract
Four analogs of an antibiotic althiomycin were synthesized in order to clarify the structure-activity relationships, especially with regard to two asymmetric centers and the aldoxime configuration. The antibiotic activity of de(hydroxymethyl) analog is comparable to that of the original antibiotic for Gram-positive bacteria.
Determination of the Equilibrium and Kinetic Parameters for the Surface-Redox Reaction of Hydroquinone Moiety of Adsorbed Adriamycin by Means of Numerical Simulation of d.c. Voltammogram
Authors: Konse Tomonori , Kano Kenji , Kubota Tanekazu 
Published: July 2006

Abstract
Electrochemical equilibrium and kinetic parameters for a redox reaction caused by the hydroquinone moiety of adriamycin adsorbed on a pyrolytic graphite electrode have been determined by means of a numerical simulation of the quasi-reversible d.c. voltammograms using a theory regarding a two-step one-electron surfaceredox reaction, since the electron-transfer rate constant is so small that the reversible d.c. wave can not be obtained and an analysis by a.c. voltammetry is difficult. The voltammogram was also analyzed from the viewpoint of a one-step two-electron surface-redox reaction mechanism taking into account the interaction parameters between adsorbed molecules. The analyses in terms of both mechanisms mentioned above reveal that the redox system considered here occurs through a two-step process.
Proton Inventory of Carboxypeptidase Y-Catalyzed Reactions
Authors: Kunugi Shigeru , Tanabe Kazuo , Fukuda Mitsuhiro 
Published: July 2006

Abstract
The partial solvent isotope effect of D2O on the carboxypeptidase Y-catalyzed hydrolysis of a peptide (3-(2-furyl)acryloyl-l-phenylalanyl-l-phenylalanine) and an ester (3-(2-furyl)acryloyl-l-phenylalanine ethyl ester) was investigated. The peptide hydrolysis showed a smaller kinetic isotope effect regarding the catalytic rate constant (kcat) and the second-order rate constant (kcat⁄Km). kcat Varied linearly on the heavy-water content, indicating that one proton is essentially transferred during the rate-determining step. On the other hand, an ester hydrolysis showed a larger, nonlinear effect, indicating the possibility of a transfer of two or more protons in the rate-determining step of the ester hydrolysis, possibly the deacylation step.
A Convenient Preparative Method of Nitrile Oxides by the Dehydration of Primary Nitro Compounds with Ethyl Chloroformate or Benzenesulfonyl Chloride in the Presence of Triethylamine
Authors: Shimizu Tomio , Hayashi Yoshiyuki , Shibafuchi Hiroshi , Teramura Kazuhiro 
Published: July 2006

Abstract
Three nitrile oxides (MeOCOC≡N→O, PhC≡N→O, and EtC≡N→O) were effectively generated in situ by dehydration of the corresponding primary nitro compounds (RCH2NO2) with PhSO2Cl or ClCOOEt in the presence of triethylamine. Various cycloadducts were prepared by the reaction of them with dipolarophiles. Some advantages of these methods are described in comparison with other known methods.
Pseudo-Sugars. XVI. Facile Synthesis of Pseudo-α-d and l-Glucopyranoses
Authors: Ogawa Seiichiro , Nakamura Kazufumi , Takagaki Tohei 
Published: July 2006

Abstract
Optically active pseudo-α-glucopyranoses have been synthesized from enantiomeric (1,3,5/2,4)-2,3-diacetoxy-4,5-dibromo-1-cyclohexanecarboxylic acids, obtained by optical resolution of the racemic modification using (+)-and (−)-α-methylbenzylamines.