bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthetic Approach toward Antibiotic Tunicamycins
Authors: Fukuda Yoshimasa , Sasai Hiroaki , Suami Tetsuo 
Published: July 2006

Abstract
Higher-carbon carbohydrates, undecose, and dodecose derivatives have been synthesized by base-catalyzed addition between nitro sugar and sugar aldehydes. The addition reaction of 3,5-O-benzylidene-6,7-dideoxy-1,2-O-isopropylidene-7-nitro-α-d-gluco-heptofuranose (3) with 2,3 : 4,5-di-O-isopropylidene-d-arabinose yielded two isomeric dodecose derivatives. The analogous addition of 3 with 2,4-O-ethylidene-d-erythrose afforded an undecose derivative.
Mechanisms of Thermal Decomposition of trans- and cis-Dialkylbis(tertiary phosphine)palladium(II). Reductive Elimination and trans to cis Isomerization
Authors: Ozawa Fumiyuki , Ito Takashi , Nakamura Yoshiyuki , Yamamoto Akio 
Published: July 2006

Abstract
Series of trans- and cis-dialkylpalladium(II) complexes having tertiary phosphine ligands (L) of various basicities and bulkiness have been prepared and their thermolysis and isomerization mechanisms in solution have been studied. Examination of the cause of selective formation of cis-dialkyl isomers by using alkyllithium revealed a new type of trans to cis isomerization promoted by the alkyllithium. A process involving the formation of a trialkyl-palladate intermediate is proposed as a mechanism for the trans to cis isomerization. Evidence to support the mechanism has been obtained by experiments using LiCD3. Thermolysis of cis-PdR2L2 has been demonstrated to proceed through a unimolecular process initiated by a rate-determining dissociation of L to produce a three-coordinate “cis-PdR2L” which reductively eliminates the R groups. Addition of free ligand to the system containing cis-PdMe2L2 effectively blocks the reductive elimination pathway thus forcing the complex to be thermolyzed by a route involving liberation of methane. The second, novel type of trans to cis isomerization reaction proceeding via an intermolecular methyl transfer process has been discovered. As the crucial intermediate in the process a methyl-bridged complex formed between the partly dissociated three-coordinate species and undissociated complex has been postulated. Thermolysis of trans-PdMe2L2 has been found to proceed via initial isomerization to the cis form followed by reductive elimination. The trans-cis isomerization equilibrium greatly favors the cis form for complexes having phenyl-substituted phosphines. For the PEt3-coordinated palladium dimethyl, however, an equilibrium trans/cis ratio of 1.2 is reached at 39 °C. Factors influencing the stability of the palladium alkyls having the tertiary phosphine ligand are discussed on the basis of the present results as well as comparison of the thermolysis behavior of trans-PdEt2L2 and other transition metal alkyls. The presence of an energy barrier between the dissociated T-shaped intermediates trans-PdMe2L and cis-PdMe2L has been assumed. A unimolecular reductive elimination pathway proceeding from the T-shaped cis-PdMe2L intermediate through a Y-shaped transition state consistently accounts for the thermolysis as well as isomerization behavior of the trans-and cis-PdMe2L2.
A Reinvestigation of the Crystal and Molecular Structure of the β-Form of 2,4,6-Trimethyl-1,3,5-Trithiane
Authors: Sekido Kiyotane , Itoh Jun , Noguchi Teruo , Hirokawa Sakutaro 
Published: July 2006

Abstract
The crystal structure of the title compound has been reinvestgated and refined to a final R factor of 0.057 for 1286 independent reflections. The six-membered ring takes a chair-form. All the three methyl groups are in the equatorial position. The mean values are 1.818 Å and 1.513 Å for the S–C and C–C distances respectively, and 101.3° and 108.5° for the C–S–C and S–C–S angles respectively.
Phosphorylation with Pyrophosphoric Acid
Authors: Yamaguchi Hachiro , Ogura Fumio , Otsubo Tetsuo , Ikeura Yasuhiro 
Published: July 2006

Abstract
Dihydrogenphosphates of primary and secondary aliphatic alcohols as well as phenol were prepared by a very simple procedure with pyrophosphoric acid. t-Butyl and benzyl dihydrogenphosphates could be obtained by a slight modification of the reaction conditions. For the purpose of phosphorylation pyrophosphoric acid was more reactive than orthophosphoric acid.
A Convenient Preparation of Some N-Alkylcarbazoles and N-Alkylacridones
Authors: Nishi Hisao , Kohno Hisao , Kano Toshihiro 
Published: July 2006

Abstract
N-Alkylation of aromatic compounds involving nitrogen heterocycles such as carbazole and acridone with alkyl halide in the presence of caustic solution and benzyl triethyl ammonium chloride (BTEAC) as a phase-transfer catalyst readily proceeded under mild conditions. These results show that this procedure is effective for the preparation of the title compounds in high yields.
Photolysis of Dispiro-substituted 3-Thioxo-1-cyclobutanones
Authors: Kimura Koji , Fukuda Yoshihiro , Negoro Toshihiko , Odaira Yoshinobu 
Published: July 2006

Abstract
Photolysis of dispiro-substituted 3-thioxo-1-cyclobutanones in dichloromethane or even in methanol gave rise to the photoisomerization to afford thiolactones preferentially.
TiO2-supported Noble Metal Catalysts for the NO–CO and NO–CO–H2O–H2–O2 Reactions
Authors: Nakamura Ryuichi , Nakai Shuichi , Sugiyama Kazuo , Echigoya Etsuro 
Published: July 2006

Abstract
TiO2-supported noble metal catalysts, such as Pt–, Pd–, and Rh–TiO2, are much more active for the NO–CO reaction in the presence or absence of H2O, H2, and O2 than the corresponding Al2O3– or other supported catalysts. They are effective even in an oxidative gas composition range for the NO–CO–(H2O)–H2–O2 reaction, producing no NH3 in the NO–CO–H2O reaction. Comparison of the catalytic activity and properties of Pt–TiO2 with those of other supported catalysts suggests that the higher activity of the TiO2-supported catalysts could be attributed to their ability to activate NO molecules by the dissociative adsorption at lower temperatures.
The Stereochemistry and Reactivity of Metal-Schiff Base Complexes. IV. The Stereoselectivity of N,N′-Ethylenebis(α-methylsalicylideneaminato)cobalt(III) Complexes with N-Benzyl-l-alanine, N-Methyl-l-alanine, and N-Benzyl-N-Methyl-l-alanine, and the Stereospecificity of [1S, 2S)-N,N′-1,2-Cyclohexylenebis(salicylideneaminato)cobalt(III) Complexes toward N-Benzyl-l-alanine
Authors: Fujii Yuki , Matsufuru Makoto , Saito Akira , Tsuchiya Sakiko 
Published: July 2006

Abstract
Cobalt(III) complexes containing N-alkyl-l-alanine and a Schiff base ligand, β2-[Co(α-Me-sal2en)(N-R-l-ala)] (where α-Me-sal2en represents the dianion of N,N′-ethylenebis(a-methylsalicylideneamine) and N-R-l-ala denotes the anion of titled amino acids), have been prepared. They were characterized by the use of the absorption, circular dichroism, and 1H NMR spectra of the complexes. They showed quite high stereoselectivity for ΛRS-β2-configuration: 93% for N-methyl-l-alanine, and almost 100% for N-benzyl-l-alanine and N-benzyl-N-methyl-l-alanine. The similar β2-Co(sal2-(S,S-chxn) complexes with N-benzyl-l- and N-benzyl-d-alanines, where sal2-(S,S)-chxn represents the dianion of (1S,2S)-N,N′-1,2-cyclohexylenebis(salicylideneamine), have been synthesized to investigate the stereospecificity of the complex toward N-benzyl-l-alanine. It was found that Co(sal2-(S,S)-chxn) complex reacts with N-benzyl-l-alanine in a high stereospecificity (93–94% at the 1 : 2 reaction molar ratio between the complex and racemic N-benzylalanine, and almost 100% at the 1 : 100 molar ratio). The above phenomena were explained in terms of the thermodynamic selectivity of the complexes.
Acetylenic and Polyacetylenic Compounds Derived from Thiophene, Furan, and p-Dibromobenzene Using 1,1-Dichloro-2,2-difluoroethene
Authors: Okuhara Kunio 
Published: July 2006

Abstract
Compounds of the type AZCF=CCl2, prepared from AZA (thiophene, furan, and p-dibromobenzene; Z=2,5-thiophenediyl, 2,5-furandiyl, and p-phenylene; A=H or Br), were converted into CCl2=CFZC≡CH, CCl2=CFZC≡CCF=CCl2, and CCl2=CFZC≡CSi(CH3)3 in a one-flask procedure via LiZC≡CLi. The products were further converted into acetylenic compounds such as (CH3)3SiC≡CZC≡CSi(CH3)3 and (CH3)3SiC≡CZC≡C–C≡CSi(CH3)3. 1-Ethynyl-4-(1,3-butadiynyl)benzene was isolated. 2,5-Diethynylthiophene and -furan were prepared in two steps from thiophene and furan, respectively, via CCl2=CFZCF=CCl2. By treatment with copper (II) acetate hydrate in pyridine, (CCl2=CFZC≡C–)2 were obtained not only from CCl2≡CFZC≡CH but also from CCl2=CFZC≡CSi(CH3)3.
Reactivity of Peroxomonophosphoric Acid in the Oxidation of Benzaldehydes and Dimethyl Sulfoxide in Aqueous Ethanol
Authors: Ogata Yoshiro , Sawaki Yasuhiko , Tsukamoto Yasuyuki 
Published: July 2006

Abstract
Oxidation of benzaldehydes and dimethyl sulfoxide with peroxomonophosphoric acid (PMPA) has been studied in 40% aqueous EtOH in order to examine the reactivity of undissociated and dissociated PMPA in comparison with that of peroxycarboxylic acid. The reactivity for DMSO was in the order RCO3−&gt;H3PO5&gt;H2PO5−&gt;RCO3H&gt;HPO52−. As in the peroxycarboxylic acid oxidation, PMPA oxidation of substituted benzaldehydes afforded phenols by aryl migration and benzoic acids by hydride migration. The product ratio changed with substituents and pH; salicylaldehyde (o-HO) gave only catechol by aryl migration, while p-chloro and unsubstituted benzaldehydes afforded benzoic acids predominantly. The oxidation of aldehydes bearing p-MeO and p-Me was a borderline case and the migratory ratio of Ar∼/H∼ was higher at lower pH, i.e., the order being H3PO5&gt;H2PO5−&gt;HPO52−. The substituent effect in the apparent kobsd values was very small (i.e., ρ≈0), but the effect for aryl migration (kAr∼) estimated from product selectivity gave ρ=−2.88(σ). The rate for hydride migration (kH∼) resulted in ρ=1.7 and 2.0 (σ). Reactivity of PMPA in each dissociated form was compared with that of RCO3H.
An Occurrence of Attractive Alkyl-Phenyl Interaction. The Conformations of Several 1-Phenyl-2-alkanols
Authors: Zushi Shoji , Kodama Yoshio , Fukuda Yoshimasa , Nishihata Ken , Nishio Motohiro , Hirota Minoru , Uzawa Jun 
Published: July 2006

Abstract
The conformations have been studied, by means of NMR spectroscopy, for a series of 1-alkyl-substituted 2-phenylethyl alcohols with the structure C6H5CH2CH(OH)–R, where R=CH3 (1), C2H5 (2), i-C3H7 (3), and t-C4H9 (4). It has been suggested that a rotamer in which the phenyl group is oriented gauche to the alkyl (R) and anti to the hydroxyl group is most populated in the conformational equilibria of 1–3. Another rotamer (in which Ph is anti to R) has, on the other hand, been suggested to be preferred in the conformational equilibrium of 4. The results have been discussed in the light of the presence of an attractive alkyl-phenyl interaction (CH–π interaction).
Insertion of Carbon Monoxide into Nickel-Alkyl Bonds of Monoalkyl-and Dialkylnickel(II) Complexes, NiR(Y)L2 and NiR2L2. Preparation of Ni(COR)(Y)L2 from NiR(Y)L2 and Selective Formation of Ketone, Diketone, and Aldehyde from NiR2L2
Authors: Yamamoto Takakazu , Kohara Teiji , Yamamoto Akio 
Published: July 2006

Abstract
Reactions of monoalkylnickel(II) complexes, NiR(Y)L2 (R=CH3, C2H5; Y=Cl, suc(succinimido), pht(phthalimido), OC6H4-p-CN; L=1/2 bpy (2,2′-bipyridine), PEt3 (triethylphosphine)), with CO afford monoacylnickel(II) complexes, Ni(COR)(Y)L2, which are characterized by elemental analysis and spectroscopies (IR and NMR). Reactions of the acylnickel(II) complexes with alcohols and aniline give the corresponding esters and amides, respectively. Exposure of Ni(COR)(Y)L2 to dry air leads to oxidation of RCO to a RCOO ligand giving a complex formulated as Ni(OCOR)(Y)L2. Reactions of dimethylnickel(II) complexes, Ni(CH3)2L2 (L=1/2 bpy, PEt3, 1/2 dpe (1,2-bis(diphenylphosphino)ethane, 1/2 dpp (1,3-bis(diphenylphosphino)propane), with carbon monoxide afford acetone and/or 2,3-butanedione in medium to high yields, the acetone/2,3-butanedione ratio varying with the ligand L, reaction temperature, and additives such as maleic anhydride and triphenylphosphine. Generally the acetone/2,3-butanedione ratio decreases with increase in thermal stabilities of Ni(CH3)2L2. Ni(C2H5)2(bpy) and Ni(n-C3H7)2(bpy) give 3-pentanone and 4-heptanone, respectively, on treating them with CO, whereas Ni(C2H5)2(dpe) produces C2H5CHO and C2H4.
ESR Study of the Spin-labeled Poly(methyl methacrylate) Adsorbed on the Human Tooth and Hydroxyapatite
Authors: Sakai Harutoshi , Asakura Tetsuo , Suzuki Kazuomi , Horie Kozo , Maeshima Yukihiro , Imamura Yoshio 
Published: July 2006

Abstract
The motion and the configurational behavior of the poly(methyl methacrylate) adsorbed on the surfaces of human tooth substances (dentin, enamel, and hydroxyapatite crystal) from a solution were clarified by using the electron-spin-resonance technique. The polymer molecules were more strictly bound by the surfaces of enamel and hydroxyapatite than the dentin. On both enamel and hydroxyapatite, the adsorbed molecules behaved in the same manner in their motion and configuration. However, the segments directly bound by each tooth substance had a much higher degree of motional freedom than those by the silica surface. These results were discussed in relation to the interaction between the polymer and the tooth, and in relation to the clinical adhesive aspects.
Ultrasonic Investigation on the Structure of Aqueous Solutions of N,N-Dimethylformamide and Dimethyl Sulfoxide
Authors: Subbarangaiah Kopparapu , Murthy Neriyanuri Manohara , Subrahmanyam Saraswatula Venkata 
Published: July 2006

Abstract
The effects of N,N-dimethylformamide and dimethyl sulfoxide on the temperature of adiabatic compressibility minimum (Tβ) and sound velocity maximum (Tu) of water have been studied. The structural contributions to the shift in Tβ and Tu, [ΔTβ str.]exp. and [ΔTu str.]exp., have been found to be negative for both solutes. Both [ΔTβ str.]exp. and [ΔTu str.]exp. are higher for dimethyl sulfoxide than N,N-dimethylformamide indicating that the sulfinyl group (Remark: Graphics omitted.) is more efficient in structure disruption than the formylimino group (Remark: Graphics omitted.). The results have been explained in the light of hydrogen bonding equilibria by the solutes.
Effect of Hydrogen Bonding on the Phosphorescence of Benzo[c]cinnoline in Polyhydric Solvents
Authors: Inoue Hiroyasu , Hiroshima Yukimi , Tomiyama K\={o}ichi 
Published: July 2006

Abstract
Phosphorescence of benzo[c]cinnoline has been found to be enhanced in polyhydric solvents, such as ethylene glycol, glycerol, and aqueous ethanol. Enhancement of the phosphorescence emission can be attributed to the formation of the hydrogen bond in the triplet state of benzo[c]cinnoline with the solvent molecules.
Magnetic Properties of Copper(II) Complexes of Phenylboronic Acid
Authors: Emori Shuji , Masuo Hisayasu , Muto Yoneichiro 
Published: July 2006

Abstract
The magnetic susceptibilities of copper (II) phenylboronate obey the Bleaney-Bowers equation for dinuclear clusters. The exchange integral within the dinuclear copper(II) phenylboronate, J⁄k, is equal to −195 K. The structures for hydrolysis products of copper(II) phenylboronate are presumed to contain copper(II) phenylboronate dinuclear units connected together by diborate bridges.
The Synthesis of Anthglutin and Its Analogues
Authors: Kinoshita Takeshi , Watanabe Hiroko , Minato Sadamasa 
Published: July 2006

Abstract
Anthglutin (1-γ-l-glutamyl-2-(2-carboxyphenyl)hydrazine) and its analogues were synthesized. Their inhibitory activity on γ-glutamyl transpeptidase was measured. 2-Carboxyphenyl derivatives, including anthglutin, showed inhibitory activity, while the other derivatives did not. The 2-carboxyl group seems to be essential for the inhibitory activity.
Electrical and Optical Properties of a Stable Synthetic Metallic Polymer: Polypyrrole
Authors: Watanabe Atsushi , Tanaka Masashi , Tanaka Jiro 
Published: July 2006

Abstract
Absorption and reflection spectra of the polypyrrole films prepared by electrochemical polymerization are shown over the wide wavelength region and the best fit of the calculated reflection spectra is presented to the observed spectra. Electrical conductivity of the film is measured as a function of temperature and a plot of logσ vs. T−1⁄4 gives a straight line over the 4.2–300 K region. Furthermore, the thermoelectric-power, S, of the polypyrrole film is shown in the form of S vs. T on a linear scale. Based on these results, the conduction mechanism of polypyrrole film is discussed.
Preparation of Graphite Intercalation Compounds of Thiazyl Salts
Authors: Nakajima Tsuyoshi , Kawaguchi Masayuki , Watanabe Nobuatsu 
Published: July 2006

Abstract
Thiazyl salts prepared from S3N3Cl3 and MCl3(M=Sb, Fe, Al) were intercalated into flaky or powdery natural graphite in CCl4 or SOCl2. Intercalation compounds prepared are C24S4N4·2SbCl5[2nd stage, Ic(repeat distance)=12.81±0.02 Å], C9.5·0.2(S3N3Cl3·FeCl2)·0.8(SOCl2·FeCl2) [2nd stage, Ic=12.77±0.03 Å], C11S3N3Cl3· 2.4FeCl2 [a mixture of 1st and higher stage compounds, Ic=9.17±0.05 Å] and C24·0.4(S3N3Cl3·2AlCl2)·0.6(SOCl2·2AlCl2) [a mixture of 2nd and 3rd stage compounds, Ic=12.89±0.03 Å, 16.23±0.03 Å]. Electrical conductivity of pyrolytic carbon–S4N4·2SbCl5 [3rd stage] is higher than that of original pyrolytic carbon by one order.
Synthesis of β-Substituted Tetramethyltetraazacyclotetradecatetraene and Its Metal(II) Complexes
Authors: Tokumitsu Takao , Hayashi Takayuki 
Published: July 2006

Abstract
N,N′-Bis(1-methyl-3-thioxo-1-butenyl)ethylenediamine (3) was prepared by the reaction of N,N′-bis(1-methyl-3-oxo-1-butenyl)ethylenediamine with phosphorus pentasulfide in pyridine. The reaction of 3 with ethylenediamine gave 5,7,12,14-tetramethyl-1,4,8,11-tetraazacyclotetradeca-4,6,11,13-tetraene (4) in a 46% yield. The reactivity of the β positions of 4 and its metal(II) complexes (M=Cu, Ni, Pd) toward various electrophilic reagents was explored, and some β,β′-bissubstituted tetraaza macrocyclic compounds (substituent=Cl, SC6H4NO2(o), N2Ph) and their metal complexes were prepared, respectively. The former also reacted with metal(II) acetates to afford the same metal complexes.
Studies on Characteristics of Electron Capture Responses. V. Estimation of Electron Attachment Mechanisms from Carrier Gas Flow-rate Dependence of Electron Capture Coefficients
Authors: Takeuchi Masahiro 
Published: July 2006

Abstract
The electron capture coefficients, K, denned by Wentworth et al. were measured for several samples in various carrier gas flow-rates, F, by a pulse sampled electron capture detector (ECD). The carrier gas flow-rate dependence of K, i.e., the plot of K versus F, is discussed from the viewpoint of the kinetic theory. The results reveal that the flow-rate dependence of K can be used for estimating the electron attachment mechanisms.
Sorption Behavior of Low Molecular Weight Organic Vapors on β-Cyclodextrin Polyurethane Resins
Authors: Mizobuchi Yoshikazu , Tanaka Minoru , Kawaguchi Yoshihiro , Shono Toshiyuki 
Published: July 2006

Abstract
The sorption behavior of low molecular weight organic vapors on β-cyclodextrin polyurethane resins was estimated from desorption or breakthrough experiments and compared with that on the commercially available resins. Temperature-programmed desorption patterns show that the β-cyclodextrin resins interact strongly with benzene vapor in a nitrogen or air stream. This strong interaction presumably results from the hydrophobic interaction of benzene with the β-cyclodextrin cavity. From the breakthrough experiments using the gas stripping method, it was found that the resin prepared by reacting β-cyclodextrin with 1,3-bis(isocyanatomethyl)cyclohexane, β-H6XDI-P-6.0-M, retains the polar volatile organic compounds more than Amberlite XAD-7 does.
Kinetics of the Oxidation of Ethylenediaminetetraacetato and N-(2-Hydroxyethyl)ethylenediamine-N,N′,N′-triacetato Complexes of Cobalt(II) by Hydrogen Peroxide in Aqueous Acidic Medium
Authors: Banerjee Pradyot , Pujari Mahesh P 
Published: July 2006

Abstract
Kinetics of the oxidation of Co(II) complexes, Co(edta)2− and Co(hedta)− [H4edta=ethylenediaminetetra-acetic acid and H3hedta=N-(2-hydroxyethyl)ethylenediamine-N,N′,N′-triacetic acid] have been studied in aqueous acidic medium (pH 3.6–4.8) at 30–60 °C. The reactions were shown to exhibit second-order kinetics, first-order in each of the reactants. In the pH range studied, the rates of reaction showed inverse [H+] dependence which could be accounted for in terms of the acid-base equilibrium H2O2\oversetKa\ightleftharpoonsHO2−+H+. Applying the limiting conditions [H+]&gt;&gt;Ka, [H2O2]&gt;&gt;[HO2−], the rate-law is given by d[CoIII−L]⁄dt=2{kH2O2+kHO2−Ka[H+]−1} [CoII−L] [H2O2] where L denotes the general form of the ligand in either case. At 30 °C (I, 0.5 mol dm−3), values obtained are kH2O2=(5.6±0.3)×10−5 mol−1 dm3 s−1, kHO2−=(5.4±0.3)×102 mol−1 dm3 s−1 for the Co(edta)2− complex and kH2O2=(4.5±0.4)×10−5 mol−1 dm3 s−1, kHO2−=(5.1±0.5)×102 mol−1 dm3 s−1 for the Co(hedta)− complex. The corresponding activation parameters are ΔH\eweq=(71±8) kJ mol−1, ΔS\eweq=−(92±23) J K−1 mol−1 (Co(edta)2− system) and ΔH\eweq=(89±2) kJ mol−1 and ΔS\eweq=−(36±4) J K−1 mol−1 (Co(hedta)− system).
Catalysis by Alkaline Earth Metal Oxides. II. The Mechanism of Ethylene Hydrogenation on Magnesium Oxides
Authors: Tezuka Makoto , Inoue Yasunobu , Yasumori Iwao 
Published: July 2006

Abstract
The kinetic study of ethylene hydrogenation on a thermally activated MgO was carried out. The slow step of the reaction changed from the irreversible addition of a hydrogen atom to adsorbed ethylene in the lower temperature range(373–423 K) to the hydrogenation of an ethyl radical in the higher temperature range (523–673 K).
X-Ray Photoelectron Spectroscopic Studies of SbSI
Authors: Ikemoto Isao 
Published: July 2006

Abstract
The binding energies of the core electron peaks suggest that SbSI has more ionic character than covalent character. The valence band spectrum was compared with the calculated density of states. XPS spectra of low temperature ferroelectric phase could not be obtained due to the inhomogeneous spontaneous polarization.
The Halogenation of the N,N′-Ethylenebis(5,5,5-trifluoro-4-oxo-2-pentaniminato)nickel(II) Complex and the Reaction Intermediate
Authors: Fujii Yuki , Ito Masaaki , Akiyama Kunio 
Published: July 2006

Abstract
[Ni(tfac2en)] reacted with NXS (N-chloroor N-bromosuccinimide) in an alcoholic solvent to give the halogenated complexes at the γ-carbon atoms. The reaction intermediate was successfully isolated and was characterized by the use of the 1H-NMR, IR, and AB spectra.
Ligand Dissociation Rate Constants of Tris(4,4′-dimethyl-2,2′-bipyridine)chromium(II) and Tris(5,5′-dimethyl-2,2′-bipyridine)chromium(II) Complexes
Authors: Nakano Kunio , Narusawa Yoshio , Moroi Hiroyuki 
Published: July 2006

Abstract
Ligand dissociations of tris(4,4′-Me2bpy)- and tris(5,5′-Me2bpy)chrornium(II) complexes have been studied by scavenging the ligand with zinc ion according to a stopped-flow method.
Solubility Phase Diagram Containing Racemic Compound of Bis(ethylenediamine)oxalatocobalt(III) Oxalate
Authors: Fuyuhiro Akira , Yamanari Kazuaki , Shimura Yoichi 
Published: July 2006

Abstract
Solubility of Δ- and rac-[Co(ox)(en)2](C2O4)0.5 was measured in water at 5–60 °C, the solubility isotherm of the ternary system, Λ-[Co(ox)(en)2](C2O4)0.5−Δ-[Co(ox)(en)2](C2O4)0.5−H2O being determined at 25 °C. It was found that the oxalate is not spontaneously resolvable and forms the racemic compound, Λ-[Co(ox)(en)2]·Δ-[Co(ox)(en)2](C2O4)·nH2O.
Extraction of Lead(II) in Aqueous Thiocyanate-Perchlorate Solutions wtih Trioctylphosphine Oxide in Hexane and with 4-Methyl-2-pentanone
Authors: Kusakabe Satoshi , Sekine Tatsuya 
Published: July 2006

Abstract
The stability of lead(II) thiocyanate complexes and the extraction behavior of lead(II) in 1 mol dm−3 Na(SCN, ClO4) were studied. By an extraction method with thenoyltrifluoroacetone, logβ1=0.49 was obtained for PbSCN+. The extraction was poor with 4-methyl-2-pentanone but effective with trioctylphosphine oxide in hexane. Not only Pb(SCN)2 but also Pb(SCN)(ClO4) and Pb(ClO4)2 were extracted into both of the solvents.