bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Extraction of the Vanadium(V)-Pyrocatechol Violet Complex with Tridodecylethylammonium Bromide
Authors: Shijo Yoshio , Shimizu Tokuo , Sakai Kaoru 
Published: July 2006

Abstract
Vanadium(V) can be quantitatively extracted from an aqueous solution into carbon tetrachloride as the ion-association system formed between its Pyrocatechol Violet complex anion and tridodecylethylammonium salt. The optimum pH range for the extraction is around 5. The ternary complex has an absorption maximum at 570 nm in the organic layer. The distribution ratio and the molar absorptivity are 1.78×102 and 4.0×104 mol−1 cm−1 respectively. Omitting the other adducts which may be combined with vanadium, the composition of the ternary complex is estimated to be V(PV)2(R3R′N)2. The extraction constant is given by logKex=12.58. The interference of foreign ions is discussed, too.
An X-Ray Photoelectron Spectroscopic Study of Several Hydroxy Azo Metal Complexes
Authors: Yoshida Tooru 
Published: July 2006

Abstract
The X-ray photoelectron spectra of the copper(II) and nickel(II) complexes of five o-hydroxy azo compounds were measured. The N(1s) electron spectra of the complexes of 1-phenylazo- and 1-(1-naphthylazo)-2-naphthols showed the presence of only one kind of nitrogen atom, suggesting an equalization in the electron densities on the two nitrogen atoms of an azo group. Such equalization was observed also in the complexes of 1-(8-quinolylazo)-2-naphthol. The N(1s) spectra of the complexes of 1-(2-pyridylazo)- and 1-(2-thiazolylazo)-2-naphthols, on the other hand, showed the presence of three kinds of nitrogen atoms, suggesting the non-equalization of the two nitrogen atoms of an azo group. These results were explained mainly on the basis of the mode of ligand coordination and the resonance structure of the sodium salt of the ligand. Furthermore, the relation between the structures of the complexes and the O(1s) chemical shifts was discussed.
Reaction of Acetals with Grignard Reagents
Authors: Ishikawa Hiroshi , Mukaiyama Teruaki , Ikeda Shigeru 
Published: July 2006

Abstract
The reaction of dialkyl acetals derived from α,β-unsaturated aldehydes with Grignard reagents using TiCl4in THF afforded the cross coupling products, allyl ethers, in high yields. The TiCl4-promoted reaction of alkyl 2,4-dichlorophenyl acetals, synthesized from 3,4-dihydro-2H-pyran or ethyl vinyl ether and 2,4-dichlorophenol, with Grignard reagents in THF at low temperature afforded the corresponding unsymmetrical ethers in high yields. When alkyl 2,4-dichlorophenyl acetals, synthesized from aromatic aldehyde or vinyl ethers and 2,4-dichlorophenol, were treated with Grignard reagents in benzene or toluene at room temperature in the absence of TiCl4, the cross coupling reaction took place and the corresponding ethers were isolated in good yields.
Cyclic Carbene–Palladium(II) Complexes Derived from the Reactions of Isocyanide–Palladium(II) Complexes with Nitrilimines and Nitrilylides
Authors: Fuchita Yoshio , Hidaka Kazuhisa , Morinaga Shigeki , Hiraki Katsuma 
Published: July 2006

Abstract
cis-[PdCl2(PPh2R1)(CN–C6H4–CH3-p)] (R1=Ph or Et) reacts with nitrilimines or nitrilylides, derived from the reactions of either N-phenylarenecarbohydrazonoyl chlorides or N-(p-nitrobenzyl)arenecarboximidoyl chlorides with triethylamine, to afford novel cyclic carbene–palladium(II) complexes, viz. 1,2,4-triazol-5(4H)-ylideneor 2-imidazolin-5-ylidenepalladium(II) ones, respectively. Halogen exchange reactions of the carbene complexes with lithium bromide or sodium iodide give the corresponding dibromo- or diiodocarbene complexes, respectively. trans-[PdI2(PPh2-C6H4-CH3-p)(CN-C6H4–NO2-p)] also reacts with the nitrilimine or the nitrilylide to produce cyclic carbene–palladium(II) complexes. All the complexes prepared in this study are characterized by elemental analysis, IR and 1H-NMR.
Measurement and Analysis of the ν4 Band of Fluoroform and Its Molecular Constants
Authors: Sofue Susumu , Kawaguchi Kentarou , Hirota Eizi , Fujiyama Tsunetake 
Published: July 2006

Abstract
The ν4 fundamental of fluoroform has been measured with a tunable diode-laser source spectrometer. The following molecular constants were determined: ν0=1377.8458 cm−1, B4=0.344788 cm−1, C4=0.189134 cm−1 (Cζ)4=0.18619 cm−1, D4J=3.78×10−7 cm−1, D4JK=−5.73×10−7 cm−1, D4K=2.94×10−7 cm−1, η4J=1.44×10−6 cm−1, and η4K=−8.2×10−7 cm−1. Using the molecular constants of the 2ν3, the Coriolis x-y interaction constant between the ν4 fundamental and 2ν3, |ζ334|, was estimated to be 0.065.
X-Ray Photoelectron Spectrum of Cr2O5
Authors: Tsutsumi Takayoshi , Ikemoto Isao , Namikawa Tatsuru , Kuroda Haruo 
Published: July 2006

Abstract
The X-ray photoelectron spectrum of the powder of Cr2O5 was measured and compared with those of the related chromium compounds. It is concluded that Cr2O5 is a mixed-valence compound having Cr3+ and Cr6+ ions, possibly with the ratio of 1 : 2.
Effect of Ionic Strength on the Metachromatic Behavior of Dye–Polymer Systems
Authors: Yamaoka Kiwamu , Takatsuki Mineo 
Published: July 2006

Abstract
The effect of added sodium chloride on the metachromatic interaction between cationic dyes (Crystal Violet, Trypaflavine, and 9-aminoacridinium chloride) and sodium polyphosphate and poly(ethylenesulfonate) was studied in aqueous solutions by measuring the visible absorption spectra and by determining the bound-dye spectra and the equilibrium constants with the principal component analysis.
Vibrational Spectra and Normal Coordinate Calculations for Trimethylsilane
Authors: Imai Yoshika , Aida Koyo 
Published: July 2006

Abstract
Vibrational spectra of trimethylsilane-d0, -d1, -d9 and -d10 have been obtained. Assignments for all the fundamentals have been made assuming C3V molecular symmetry. Normal coordinate calculations have been carried out to confirm the assignments.
Structural Study of Optical Resolution. XI. The Crystal Structures of (+)589-Tris(biguanide)cobalt(III) Chloride d-Tartrate Trihydrate and Racemic Tris(biguanide)cobalt(III) Trichloride
Authors: Tada Toshiji , Kushi Yoshihiko , Yoneda Hayami 
Published: July 2006

Abstract
The crystal structures of the more-soluble diastereomeric salt, (+)589-[Co(Hbg)3]Cl(d-tart)·3H2O (1), and the racemic chloride salt, [Co(Hbg)3]Cl3 (2), have been determined by X-ray analysis (R=0.033, 2788 reflections for 1 and R=0.056, 2785 reflections for 2), where Hbg=C2H7N5, d-tart=C4H4O62−. The more-soluble salt 1 is orthorhombic, with the space group P212121 Z=4, a=15.654(2), b=13.758(2), and c=11.010(1) Å. The racemic salt 2 is monoclinic, with the space group C2/c, Z=8, a=19.441(9), b=14.901(7), c=15.911(6) Å, and β=127.63(2)°. In 1, the complex cations and the Cl− ions are arranged alternately to form an infinite spiral chain, {Δ-[Co(Hbg)3]Cl}∞. Each d-tartrate is hydrogen-bonded to a twofold-screw-axis-related neighbor (–OH···OOC– 2.792 Å) to form an infinite chain, (d-tart)∞. In 2 two kinds of similar infinite spiral chains, {Δ-[Co(Hbg)3]Cl}∞ and {Λ-[Co(Hbg)3]Cl}∞, which are mirror images of each other are found. The structures of these two salts 1 and 2 are compared with those of the less-soluble diastereomeric chloride d-tartrate and the optically active chloride in both of which a similar infinite chain has been found, and the mechanism of chiral discrimination via the diastereomer formation is discussed.
Phosphatosulfates. Metal-ion Effects on the Acid-catalyzed Hydrolysis of Phenyl Phosphatosulfate in an Acetonitrile–Water Mixed Solvent
Authors: Eiki Toshio , Asai Yoshio , Tagaki Waichiro 
Published: July 2006

Abstract
The rates of the acid-catalyzed hydrolysis of phenyl phosphatosulfate (PPS) have been found to be highly dependent on the water content in the mixed solvent of acetonitrile–water. A remarkable rate acceleration was observed with a rate maximum near the 1 : 1 ratio of PPS and metal ion, and with a solvent with a low water content. Under such conditions, the site of the cleavage of the P–O–S linkage was observed to be predominantly the S–O bond.
Photoinduced Intramolecular Substitution. II. Absence of meta-Favoring Effect in Nucleophilic Photosubstitution of Nitroveratrole Derivatives
Authors: Mutai Kiyoshi , Yokoyama Kenji , Kanno Sei-ichiro , Kobayashi Keiji 
Published: July 2006

Abstract
Possible occurrence of the photo-Smiles rearrangement accompanying meta-favoring nucleophilic aromatic substitution was examined in a homologous series of 1-(2-methoxy-4-nitrophenoxy)-ω-anilinoalkanes. The structure of reaction products, the reaction kinetics, and absorption spectra of intermediates showed no appreciable alteration of reaction pathway by the introduction of 2-methoxyl group. The photoreaction was exclusively a para-directing nucleophilic substitution.
A New Preparative Method of 2,2-Dimethyl-2H-chromenes
Authors: Kawase Yoshiyuki , Yamaguchi Seiji , Horita Hisanori , Takeno Junko , Kameyama Hideaki 
Published: July 2006

Abstract
2,2-Dimethyl-2H-chromene was prepared from salicylaldehyde and ethyl 3-methyl-2-butenoate (or ethyl α-bromoisobutyrate) in one step. This new method of preparing 2,2-dimethyl-2H-chromene was studied and applied to some 2,2-dimethyl-2H-chromene derivatives.
Synthesis of 3β-Hydroxytaxodione and Coleons S and T
Authors: Matsumoto Takashi , Kawashima Hiroyuki , Iyo Koji 
Published: July 2006

Abstract
Hinokiol diacetate was converted into 3β-acetoxyabieta-8,11,13-triene-6β,12-diol via 3β,12-diacetoxyabieta-8,11,13-trien-7-one and 3β,12-diacetoxyabieta-6,8,11,13-tetraene. Oxidation of the 6β,12-diol with benzoyl peroxide produced 3β-acetoxy-12-benzoyloxyabieta-8,11,13-triene-6β,11-diol, which was converted into 3β,11,12-triacetoxyabieta-8,11,13-trien-6-one by lithium aluminium hydride reduction, acetylation, and Jones oxidation. Acidic hydrolysis of the triacetoxy ketone, followed by column chromatography on silica gel, afforded 3β-hydroxytaxodione. Oxidation of the 6β,11-diol with m-chloroperbenzoic acid afforded 3β-acetoxy-12-benzoyloxy-6β-hydroxyabieta-8,12-diene-11,14-dione. This was further converted into 3β,11,14-triacetoxy-12-benzoyloxyabieta-8,11,13-triene-6,7-dione by a series of reactions: Jones oxidation, reduction with zinc powder and dilute hydrochloric acid, acetylation, and Jones oxidation. Alkaline hydrolysis of the 6,7-dioxo compound afforded coleon T, which was isomerized to coleon S by refluxing with concentrated hydrochloric acid in methanol.
Partition Coefficients of Chlorobenzenes in Heptane–Water and Heptane–Acetonitrile Systems
Authors: Suzuki Nobuo , Yoshida Toshinobu , Watarai Hitoshi 
Published: July 2006

Abstract
Partition coefficients (KD) of benzene and 11 chloro derivatives of benzene were determined at 25 °C in two liquid-liquid partition systems: heptane/water and heptane/acetonitrile. Increase of KD with increase of the numbers of Cl atoms in the solute is discussed in terms of surface and cohesive energies. The small difference in KD of the isomers whose Cl atom numbers are 2, 3, or 4 was correlated with a difference in the dipole moment of the solute.
The Crystal and Molecular Structure of Strontium Bis(thiocyanate)-Hexaethylene Glycol (1/1)
Authors: Yamaguchi Iwao , Miki Kunio , Yasuoka Noritake , Kasai Nobutami 
Published: July 2006

Abstract
The molecular structure of strontium bis(thiocyanate)-hexaethylene glycol(1/1) has been determined from single crystal X-ray diffraction data(3121 observed reflections): triclinic, space group P\bar1, a=12.086(4), b=8.732(2), c=10.628(2) Å, α=80.88(2), β=101.99(3), γ=100.55(2)°, Dm=1.48, Dc=1.48 g cm−3 for Z=2. The central Sr ion is coordinated by seven O atoms from the hexaethylene glycol moiety and two N atoms from the SCN groups; the Sr–O distances range from 2.603(5) to 2.750(5), while the Sr–N distances are 2.628(8) and 2.634(8) Å. The hexaethylne glycol moiety assumes a GT2\barGT2GT2\barGT2GTG2 conformation.
The Quenching of Excited Zinc(3PJ) Atoms by Alkane Hydrocarbons
Authors: Yamamoto Shunzo , Nishimura Norio 
Published: July 2006

Abstract
The intensities of the 307.6 nm resonance line of zinc were measured at different pressures of alkane hydrocarbons, and the quenching-rate constants were determined on the basis of the Stern-Volmer plots. A remarkable dependence of the quenching cross-section on the C–H bond strength was observed, and the relative decrease in the quenching cross-section with an increase in the C–H bond strength was interpreted in terms of the semiempirical bond-energy-bond-order(BEBO) method.
The Effects of Multivalent Anions on the Aluminium Ion-assisted Aquation of the Pentaamminefluorocobalt(III) Complex
Authors: Iida Masayasu , Ando Mieko , Yamatera Hideo 
Published: July 2006

Abstract
The presence of multivalent anions, such as sulfate, oxalate, and malonate ions, accelerated the aluminium ion-assisted aquation of CoF(NH3)52+ and gave the anionopentaamminecobalt(III), along with the aqua complex. The competition reaction for the sulfate ion showed a saturation of the product percentage (33% CoSO4(NH3)5+) at nearly [SO42−]total=0.1 mol dm−3, while the saturation of the reaction rate was observed at a higher sulfate concentration. This difference can be explained by a scheme in which the reaction proceeds through two intermediates, CoF(NH3)52+·SO42−·Al3+ and SO42−·CoF(NH3)52+·SO42−·Al3+. The reaction for the oxalate and malonate ions gave extremely large yields (more than 90%) of CoA(NH3)5+ (A2−=oxalate ion or malonate ion) when [A2−]total/[Al3+]total&gt;2, and the reaction rates showed a maximum at approximately [A2−]total/[Al3+]total=2. These specific effects can be attributed both to the strong affinities of the dicarboxylate ions for the aluminium ion and to the residual capacity of the aluminium-bonded dicarboxylate ions for coordinating with cobalt(III).
Reactivity of Fe2O3 and Fe2O3–Al2O3 Mixture for Reduction of SO2 with CO
Authors: Ishii Tadao , Furuichi Ryusaburo , Shikano Koji 
Published: July 2006

Abstract
Catalytic reactivities of α-Fe2O3 powder (−200 mesh) and a α-Fe2O3–γ-Al2O3 powder mixture prepared by mechanical mixing, which were preheated at 360–700 °C, were studied for the reduction of SO2 with CO by means of both a reaction gas-chromatographic technique using CO, SO2, and 2CO–SO2 pulses and the powder X-ray analysis. The reactivity of Fe2O3 decreases with increasing preheating temperature, which is explained on the basis of redox reactions between Fe2O3 and nascent (Fe3O4): 6Fe2O3+2CO→4(Fe3O4)+2CO2 and 4(Fe3O4)+SO2→6Fe2O3+1/2S2. It is considered that the reactivity of Fe2O3 is attributable to the activity of (Fe3O4). The lifetime of active (Fe3O4) is within about 1 min, and the activity and lifetime of (Fe3O4) is increased by interfacial reaction between Fe2O3 and Al2O3 at 700 °C. The activity maximum in the Fe2O3–Al2O3 system preheated at 700 °C is attained at 70–75 wt% Fe2O3.
Preparation and Spectroscopic Studies of Stereoisomers of the Tris[(S)-1-phenyl-1,3-propanediamine]cobalt(III) Complex
Authors: Kojima Masaaki , Fujita Junnosuke 
Published: July 2006

Abstract
Three, fac-Δ, fac-Λ, and mer-Δ, of four possible diastereomers of the [Co(S-phtn)3]3+ complex (S-phtn=(S)-1-phenyl-1,3-propanediamine) were obtained by two methods, a reaction between trans-[CoCl2(S-phtn)2]+ and S-phtn in DMSO (dimethyl sulfoxide), and oxidation of a DMSO solution containing Co(II) ions and S-phtn with air in the presence of active charcoal. Neither method yielded the mer-Λ isomer. The absorption and circular dichroism spectra of the isomers were recorded in water in the absence and presence of Na2SO4, and in DMSO. The shifts of the first absorption bands caused by changing solvents and the changes of circular dichroism spectra caused by the addition of sulfate ions seem to be related with the conformational instability of the flexible six-membered chelate ring in the complexes. The tetraammine complex of S-phtn was also prepared.
The Formation Process of Cobalt Sulfide from Tricobalt Tetraoxide Using Sulfur Dioxide as a Sulfidizing Agent
Authors: Matsuzaki Ryoko , Yajima Akimasa , Eguchi Motonori , Saeki Yuzo 
Published: July 2006

Abstract
The products obtained by heating a mixture of Co3O4 and carbon in a SO2 stream were CoO and CoSO4 at 400–600 °C, Co1−xS and CoO at 650–700 °C, and Co1−xS (Co0.90S) at 750–800 °C. Sulfur was obtained outside the heating zone throughout the temperature range. The possible reactions during the above process were also examined. Further, thermodynamical consideration was made of the formation of Co1−xS. The formation process of Co1−xS (Co0.90S) from Co3O4 can be represented as follows: The reaction of carbon with SO2 occurs at first to form sulfur. Above ca. 400 °C, the reaction of Co3O4 with SO2 occurs to form CoO and CoSO4. Above ca. 500 °C, the reductions of Co3O4 with carbon and with sulfur also occur to form CoO. Above ca. 600 °C, the reduction of Co3O4 with carbon occurs to form CoO. Above ca. 650 °C, Co1−xS is formed by the reaction of CoO with sulfur, both of which had been formed by the above reactions.
Photo-induced Ring-opening Reactions of 1-(2-Naphthoyl)aziridine in Various Solvents
Authors: Nishimoto Sei-ichi , Izukawa Tsukuru , Kagiya Tsutomu 
Published: July 2006

Abstract
Photoreactions of 1-(2-naphthoyl)aziridine (NAz) have been investigated in various solvents under the deaerated conditions at room temperature. The photo-irradiation of NAz in halogenated hydrocarbons afforded halogen substituted secondary amides such as N-(2-chloroethyl)-2-naphthamide (CENA) or N-(2-bromoethyl)-2-naphthamide (BENA), a ring-expanded isomer of 2-(2-naphthyl)-2-oxazoline (NOz) and the NAz oligomer containing a chlorine atom. Secondary amides such as N-(2-methoxyethyl)-2-naphthamide (MENA) and N-ethyl-2-naphthamide (ENA) were obtained together with NAz oligomer in methanol and 2-propanol, respectively. The formation of N-(2-phenoxyethyl)-2-naphthamide (PENA), phenyl-2-naphthoate (PN) and NAz oligomer was observed in phenol (72 vol%)-acetonitrile mixture.
Quantitative Structure-activity Relations in Pyrazolylpyrimidine Derivatives for Their Analgesic Activities
Authors: Miyashita Yoshikatsu , Seki Tomoko , Yotsui Yasuhiko , Yamazaki Ken-ichi , Sano Mitsuji , Abe Hidetsugu , Sasaki Shin-ichi 
Published: July 2006

Abstract
Statistically significant correlations have been demonstrated between analgesic activities of a series of pyrazolylpyrimidine derivatives and molecular properties. The structural parameters are partition coefficients, molar refractivities, an indicator variable, and MO indices obtained from the CNDO/2 method. The influence of the torsional angle between the pyrazole and pyrimidine rings on the electronic state was examined. The correlations indicate that transport and partition processes and electronic factors play a major part in determining the analgesic activity. In particular, of electronic parameters MO indices on the pyrazole ring are significant. These structure-activity relationships can be used to estimate the analgesic activities with some degree of confidence.
Total Synthesis of (±)-Pisiferic Acid, Methyl (±)-Pisiferate, and (±)-Pisiferol
Authors: Matsumoto Takashi , Usui Shuji 
Published: July 2006

Abstract
Acid catalyzed cyclization of 4-(3-isopropyl-4-methoxyphenethyl)-3,5,5-trimethyl-2-cyclohexen-1-one afforded 12-methoxyabieta-8,11,13-trien-2-one and its cis-isomer. Both compounds were further converted into 12-methoxyabieta-8,11,13-trien-2β-ol, which was treated with lead tetraacetate in the presence of iodine to yield 2β,20-epoxy-12-methoxyabieta-8,11,13-triene. Ether cleavage of the 2β,20-epoxy compound with acetyl p-toluenesulfonate, followed by catalytic hydrogenation, afforded 20-acetoxy-12-methoxyabieta-8,11,13-triene (23). This was then converted into methyl 12-methoxyabieta-8,11,13-trien-20-oate (27) via methyl 12-methoxy-7-oxoabieta-8,11,13-trien-20-oate. Demethylation of 27 with AlBr3–EtSH gave pisiferic acid, but with AlCl3–EtSH 27 was partially demethylated to give methyl pisiferate. The acetate 23 was also converted into pisiferol by demethylation and reduction.
A New Method for the Determination of Equilibrium Constant and Molar Extinction Coefficient of 1 : 1 Type Complex
Authors: Seal Bejoy Kumar , Sil Harideb , Banerjee Manas , Mukherjee Dulal Chandra 
Published: July 2006

Abstract
Job’s method of continuous variation has been reinvestigated with respect to the formation of 1 : 1 type complex from the view point of (i) geometrical significance of the Job curve, (ii) developing a method for determining the equilibrium constant and molar extinction coefficient of the complex. A mathematical analysis of the method of continuous variation as applied to the formation of strictly 1 : 1 type complex shows that the Job curve is a hyperbola obeying the equation
\frac(d–β)2a2−\frac(CM°⁄λ–1⁄2)2b2=1
where d is the corrected optical density, CM° is the initial concentration of the metal ion in solution, λ is a constant equal to the sum of the concentrations of the metal and the ligand in solution, β is the ordinate of the local origin of the hyperbola referred to the conventional framework of the Job curve, a and b represent respectively the semi-major and semi-minor axes of the hyperbola. The equation has been recast into the form x=A3d2+A2d+A1, where x=(CM°/λ–1⁄2)2 and A3, A2, and A1 are the appropriate coefficients. A parabolic fit of this equation between x and d by the least square deviation method using the computer B-6800 system enables one to find the coefficients A3, A2, and A1 from which K and ε are evaluated. This equation has been tested with literature data on a variety of 1 : 1 type metal complexes whose formation constants and extinction coefficients as calculated by the present method agree closely with those determined by other methods. The promising features of the equation have been discussed.
A New Synthesis of Aldehydes and Aldehydes-d from Grignard Reagents
Authors: Yamashita Masakazu , Miyoshi Kanako , Nakazono Yutaka , Suemitsu Rikisaku 
Published: July 2006

Abstract
Aldehydes were prepared from Grignard reagents in high yields using pentacarbonyliron as the carbonylating agent. This reaction was also found to be applicable to the synthesis of aldehydes-d.
13C and 19F Chemical Shifts Induced by C–H···Base Hydrogen Bonding. Particular Polarizations of C–Halogen and C=C Bonds
Authors: Ueji Shinichi , Nakamura Michiko , Kitadani Masayuki , Sera Akira 
Published: July 2006

Abstract
The 13C and 19F chemical shifts induced by C–H···Base hydrogen bonding were measured for dichlorofluoromethane, chloroform, pentachloroethane, and trichloroethylene. These chemical shifts were shown to be linear using the β scale of hydrogen-bond acceptor basicities proposed by Kamlet and Taft. The analysis of the linear solvation energy relationships reveals that the particular polarizations of the C–halogen and C=C bonds play an important role in the C–H···Base hydrogen-bond formation.
Synthesis of Cyclic Silyl Diazo Compounds
Authors: Sekiguchi Akira , Ando Wataru 
Published: July 2006

Abstract
Cyclic silyl diazo compounds, 1-diazo-2,2-diphenyl-4-bromo-1,2-dihydro-2-silanaphthalene, 6-diazo-1,1-dimethyl-2,3,4,5-tetraphenylsilacyclohexa-2,4-diene, and 10-diazo-9,9-dimethyl-9,10-dihydro-9-silaanthracene, were prepared and their spectroscopic properties were determined.
Absolute Configurations of α-Substituted Glycidates. (−)-(R)-Ethyl 2-Methyl-1-oxaspiro[2.5]octane-2-carboxylate and (−)-(R)-Ethyl 2,3-Dimethyl-2,3-epoxybutanoate
Authors: Sugita Toshio , Nishio Nobuyuki , Ichikawa Katsuhiko 
Published: July 2006

Abstract
The absolute configurations of the title compounds were determined by chemical correlation and by asymmetric syntheses.
Studies on the Polymerization of Acrolein Oxime. XVI. Structure of 8-Hydroxy-1,4,5,7-tetramethyl-6,8-diazabicyclo[3.2.1]oct-6-ene 6-Oxide
Authors: Ota Tadatoshi , Masuda Seizo , Tanaka Hitoshi , Kido Masaru 
Published: July 2006

Abstract
The thermal oligomerization of 3-methyl-3-buten-2-one oxime leads to crystalline nitrone derivatives, 8-hydroxy-1,4,5,7-tetramethyl-6,8-diazabicyclo[3.2.1]oct-6-ene 6-oxide. Its crystal structure has been determined by X-ray diffraction. The space group is P21/n with a=9.459(3), b=10.335(3), c=11.352(4) Å, β=105.50(2)°, and Z=4.