bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characterization of the Chiral Titanium Reagent Prepared from the Tartrate-derived Chiral Diol and Titanium Dichloride Diisopropoxide
Authors: Iwasawa Nobuharu , Hayashi Yujiro , Sakurai Hidehiro , Narasaka Koichi 
Published: May 2006

Abstract
The chiral titanium reagent prepared from the tartrate-derived chiral 1,4-diol and titanium dichloride diisopropoxide was characterized based on the NMR and experimental analyses.
The Reaction Mechanism of Ruthenium-catalyzed Dimerization of t-Butylacetylene to cis-1,4-Di-t-butylbutatriene. Involvement of a Ruthenium-diacetylide Intermediate
Authors: Wakatsuki Yasuo , Satoh Masaaki , Yamazaki Hiroshi 
Published: May 2006

Abstract
The acetylide complex [RuH(C≡C–But)(CO)(PPh3)3] (1) prepared from [Ru(H)Cl(CO)(PPh3)3)] (2) and Li–C≡C-But has been found to be a good precursor for the catalytic dimerization of t-butylacetylene to cis-1,4-di-t-butyl-1,2,3-butatriene. Room temperature reaction of 1 with HC≡CBut has afforded a new complex [Ru(C≡CBu)2(CO)(PPh3)3] which has been structurally characterized as possessing cis-diacetylide ligands. Reaction of 2 with 1,4-di-t-butylbutadiyne gave a complex with 1,4-di-t-butylbut-1-en-3-yn-2-yl ligand, [Ru–{C(=CHBut)–C≡CBut}Cl(CO)(PPh3)2], which decomposed at 60 °C to liberate cis-1,4-di-t-butylbutatriene. The reaction mechanism is discussed based on these findings.
Transition Metal-catalyzed Coupling of [1-(Arylimino)alkyl]zinc with Aromatic Iodide
Authors: Murakami Masahiro , Ito Hirohide , Bakar Wan Azelee bin Wan Abu , Baba Abu Bakar bin , Ito Yoshihiko 
Published: May 2006

Abstract
[1-(Arylimino)alkyl]zinc, prepared by α-addition of organozinc to aryl isocyanide, was coupled with aromatic iodide in the presence of palladium or nickel catalyst to give the corresponding N-aryl aromatic imine.
Observation of CLi3 and CLi4 in the Vapor over Li2C2(s)
Authors: Kudo Hiroshi 
Published: May 2006

Abstract
With Knudsen-effusion mass spectrometry, gaseous CLi3 and CLi4 species were observed for the first time in the vapor equilibrated with Li2C2(s) above 900 K. The ionization potentials and atomization energies of these species as well as the heat of formation of Li2C2(s) were determined.
Laser Flash Photolysis of 3-(4-Biphenylyl)-2H-azirine. Direct Detection of Nitrile Ylide
Authors: Naito Ikuo , Ishida Akito , Yamamoto Kazuki , Takamuku Setsuo , Isomura Kazuaki , Taniguchi Hiroshi 
Published: May 2006

Abstract
Laser flash photolysis of 3-(4-biphenylyl)-2H-azirine (AZ) has been investigated in cyclohexane. Two kinds of transient species; that is, a triplet state (T1) of AZ and a nitrile ylide (NY) were detected. Both transient species have λmax at 410 nm and the decay max rates were 6.7 × 105 s−1 (T1) and 8 × 10 s−1 (NY), respectively. Reaction rate constants of NY with propanone and acrylonitrile were also determined.
Stabilization of Unstable Components in Langmuir–Blodgett Film System by Introduction of Water-Soluble Antioxidants
Authors: Iriyama Keiji , Yoshiura Masahiko 
Published: May 2006

Abstract
Easily oxidizable components simply arranged and/or highly oriented in a monolayer on an aqueous subphase as well as in a Langmuir–Blodgett film were found to be chemically stabilized by the addition of biological water-soluble antioxidants such as glutathione, uric acid, and ascorbic acid.
Photochemistry of Arenedicarboxylic Anhydrides. Insertion of Alkenes into C(=O)–O Bond and Oxetane Formation of 1,2- and 2,3-Naphthalenedicarboxylic Anhydrides
Authors: Kubo Yasuo , Hara Noriko , Nanba Mikako , Tanaka Yoshiaki , Araki Takeo 
Published: May 2006

Abstract
Irradiation of 1,2- and 2,3-naphthalenedicarboxylic anhydrides (5a,b) with alkenes in benzene gave naphthoxepindiones, by insertion of the alkenes into C(=O)–O bond, and oxetanes. The insertion predominated in the reactions of 5a with the alkenes, while the oxetanes were mainly produced in those of 5b.
Enhanced Energy Transfer between Chlorophyll b and Chlorophyll a in the Premicellar Region of Aqueous Surfactant Solution
Authors: Kusumoto Yoshihumi , Soeta Kimihiro , Fukuyama Fumiko , Kurawaki Junichi , Satake Iwao 
Published: May 2006

Abstract
Energy transfer between chlorophyll b and chlorophyll a was enhanced irrespective of the kind of surfactants in the premicellar region below the critical micelle concentration. This effect can be explained in terms of the formation of premicellar aggregates induced by the non-ionic hydrophobic pigments.
Thermal Activation of Alkane C–H Bonds by Palladium Catalysts. Carbonylation of Alkanes with Carbon Monoxide
Authors: Fujiwara Yuzo , Takaki Ken , Watanabe Jun , Uchida Yutaka , Taniguchi Hiroshi 
Published: May 2006

Abstract
The reaction of cyclohexane with 30 atm CO at 80 °C by using the Pd(OAc)2/CF3COOH catalyst system without irradiation gives rise to cyclohexanecarboxylic acid in 195% yield based on Pd with a small amount of benzoic acid. The reactions of cycloheptane and n-hexane give similar results. This constitutes the first example of carboxylation of alkanes with CO by transition metal complexes without irradiation.
Structural Requirement for the J-Aggregate Formation in Dicyclohepta[5,6:b]pyrazino[2,3-g]quinoxaline-3,11-diones and Related Compounds
Authors: Takeshita Hitoshi , Mori Akira , Nagao Tomohiro , Nagamura Toshihiko 
Published: May 2006

Abstract
Two tetrapropyl derivatives of dicyclohepta[5,6:b]pyrazino[2,3-g]quinoxaline-3,11-dione and 9,11-dipropylcyclohepta[5,6]pyrazino[2,3-b]phenazin-10-one, revealed the J-band in cone H2SO4. On the other hand, 2,3-diphenylcyclohepta[b]pyrazino[2,3-g]quinoxalin-9-one formed a non-J-aggregate, but benzo[g]cyclohepta[b]quinoxalin-9-one formed no aggregate. A pyrazinoquinoxaline framework is required for the aggregation.
The Michael-type Reaction of B-Iodo-9-BBN/Ethoxyethyne Adduct to α,β-Unsaturated Ketones. A Selective Synthesis of δ-Keto Esters
Authors: Kawamura Fumitoshi , Tayano Takao , Satoh Yoshitaka , Hara Shoji , Suzuki Akira 
Published: May 2006

Abstract
The adduct formed from B-iodo-9-borabicyclo[3.3.1]nonane and ethoxyethyne reacts with α,β-unsaturated ketones under mild conditions to give δ-keto esters in excellent yields selectively.
Palladium-catalyzed Asymmetric Allylations of (S)-Proline Allyl Ester Amides
Authors: Hiroi Kunio , Maezuru Kaoru , Kimura Masaru , Ito Naoko 
Published: May 2006

Abstract
Palladium-catalyzed allylations of (S)-proline allyl ester amides are discussed, compared with the intermolecular reactions of (S)-proline methyl and ethyl ester amides with allyl acetate. (S)-Proline allyl ester amide undergoes an intramolecular allylation to demonstrate higher diastereoselectivity than the other systems, upon treatment with palladium catalysts.
Surface Pressure Dependence of A-T Isobars and Two-Dimensional Thermal Expansion coefficient of Insoluble Monolayers of Tristearin at the Air/Water Interface
Authors: Kato Teiji , Ohshima Katsunori , Arai Masatoshi 
Published: May 2006

Abstract
Pressure dependence of A-T isobars of insoluble monolayers of tristearin(TS) was measured with the instrument developed in our laboratory. The isobars look like a group of straight lines in the temperature span measured (5–45 °C). Pressure dependence of the two-dimensional thermal expansion coefficient of the monolayers was calculated by the numerical differentiation of the A-T isobar data with respect to temperature using a simple regression analysis.
[Bisμ-N,N′-bis(o-thiobenzoyl)ethylenediamine-S,O,O′,S′-dinickel(II)]. Synthesis of a 2×{S2O2} Bis-complex and the Structural Analysis
Authors: Yamamura Takeshi , Kuroda Reiko , Tadokoro Makoto 
Published: May 2006

Abstract
N,N′-Bis(o-thiobenzoyl)ethylenediamine reacted with Ni2+ in acetone to form a bis-complex, in which two square planar NiS2O2 units are connected with each other by two ethylene bridges.
Vibrating Phenomenon for Electrode Reaction of Mild Steel in Aqueous Ethanol Solution Containing Sulfuric Acid
Authors: Sekine Isao , Yuasa Makoto , Kohara Kazuki , Ibata Satoshi 
Published: May 2006

Abstract
It was found that natural electrode potential (NEP) of mild steel electrode vibrates in aqueous ethanol solution containing sulfuric acid. By in situ analysis of electrochemical impedance spectroscopy, this vibrating phenomenon is based on the transition between passivation (passive region) and active dissolution (active region) of the mild steel electrode.
Effect of the Introduction of Fluorine into Poly(vinylacetal) Membranes on Transport Properties for Oxygen and Nitrogen Gases
Authors: Kagawa Shuichi , Ishihama Rika , Moriguchi Isamu , Teraoka Yasutake 
Published: May 2006

Abstract
The introduction of fluorine into poly(vinylacetal) membranes was found to increase the permeability for O2 and N2 with a slight decrease in permselectivity. The results obtained indicate that the fluorine-containing poly(vinylacetal) membranes are promising as an oxygen-enriching membrane having relatively high permeability and permselectivity.
2-Substituted gem-Diamines Derived from Amino Acid Amides. Their Applications to Cross-linking in Peptide Dimerization and Conjugation of Dimer to Affinity Matrix
Authors: Shimohigashi Yasuyuki , Kodama Hiroaki , Waki Michinori , Costa Tommaso 
Published: May 2006

Abstract
Treatment of five tripeptide amides Boc-Phe-Leu-NHCH(R)CO-NH2 (R: side chain of Gly, Leu, Phe, Asp(OBzl), or Arg(Tos)) with [bis(trifluoroacetoxy)iodo]benzene and subsequent coupling with Boc-Phe-Leu-OH afforded the dimeric peptides cross-linked with 2-substituted gem-diamines; (Boc-Phe-Leu-)2·(-NHCH(R)NH-). gem-Asp(OBzl)-cross-linked dimer was further converted into enkephalin dimer, which was conjugated to Sepharose 4B gel for receptor affinity purification.
Bis(acyl) Diselenides as Convenient Acylating Reagents
Authors: Nishiyama Yutaka , Katsuura Akio , Okamoto Youji , Hamanaka Sawako 
Published: May 2006

Abstract
Bis(acyl) diselenides serve as useful acylating reagents for amines, alcohols, thiols, and organocopper compounds such as cuprate.
Gel Electrophoretic Demonstration of Pseudo-Grafting of Polyacrylamide onto λ Phage DNA
Authors: Maeda Mizuo , Hirai Akira , Takagi Makoto 
Published: May 2006

Abstract
5-(4-Acryloylaminophenyl)-3-amino-7-dimethylamino-2-methylphenazinium chloride (1) which is a DNA-binding (intercalative) molecule was radically copolymerized with acrylamide in the presence of λ phage DNA. A gel electrophoretic examination of the reaction product has strongly suggested that the DNA was grafted with polyacrylamide chains through 1 (“pseudo-grafting”).
Lewis Acid-Induced Stereoselective Ene-Cyclization of ω-Unsaturated Trifluoromethylketones
Authors: Aubert Corinne , Bégué Jean-Pierre , Bonnet-Delpon Daniéle 
Published: May 2006

Abstract
Lewis Acid-initiated ene-cyclization of ω-unsaturated trifluoromethylketones allows access to 1-trifluoromethyl cyclohexanols and their fused bicyclic derivatives
Quaternary Ammonium Salts as Useful Cationic Initiators. Specially Enhanced Activity by Cyano Group Situated at o-Position of Pyridine Ring of N-Benzylpyridinium Salts
Authors: Lee Sang-Bong , Takata Toshikazu , Endo Takeshi 
Published: May 2006

Abstract
1-Phenethyl and p-methoxybenzyl o-cyanopyridinium hexafluoroantimonates were synthesized, which showed much higher initiation activity than the corresponding p-cyano derivatives in the cationic polymerization of glycidyl phenyl ether.
Palladium-Catalyzed, Atmospheric Pressure Ethoxycarbonylation of Allylic Halides under the Influence of Sodium Ethoxide. A Facile Synthesis of β,γ-Unsaturated Esters
Authors: Kiji Jitsuo , Okano Tamon , Konishi Hisatoshi , Nishiumi Wataru 
Published: May 2006

Abstract
Atmospheric pressure ethoxycarbonylation of allylic halides is realized under the influence of sodium ethoxide. This reaction is catalyzed by Na2PdCl4-bis(diphenylphosphino)ethane (dppe) and offers a convenient synthetic method to β,γ-unsaturated esters.
Binding of Amino Acids with a Bifunctional Metalloporphyrin via Concurrent Metal-Coordination and Electrostatic Interactions
Authors: Aoyama Yasuhiro , Nonaka Shin-ichi , Motomura Tadahiro , Ogoshi Hisanobu 
Published: May 2006

Abstract
The Cl–Rh(III) complex of 5,15-bis [2-(N,N-dimethylaminomethyl-1-phenyl]octaethylporphyrin undergoes intermolecular coordination to give the dimer in CDCl3, which, upon treatment with an aqueous amino acid solution, readily forms a monomeric amino acid adduct via a two-point interaction involving the metal coordination and electrostatic interaction or salt formation.
Synthesis of Novel Biodegradable Poly(amide-Ester)s from Penicillin
Authors: Saotome Yasushi , Miyazawa Takeo , Endo Takeshi 
Published: May 2006

Abstract
Novel biodegradable poly(amide-ester)s were successfully synthesized from antibiotic penicillin, utilizing a nucleophilic addition of primary amines to the β-lactam ring of penicillin.
A DNA Probe of Ruthenium Bipyridine Complex Using Photocatalytic Activity
Authors: Kojima Hiroyuki , Sato Naoko , Kawamoto Yuri , Iyoda Jun 
Published: May 2006

Abstract
A method is presented for labelling DNA and for detection of the complimentary sequence using photocatalytic activity of tris(2,2′-bipyridine)ruthenium(II). A hybridization experiment with a model system has shown that plasmid DNA of ca. 0. 6 μg can well be detected by a dye-forming reaction in photocatalytical redox cycles.
Temperature-Dependent Photostationary trans/cis Ratio in Photosensitized Isomerization of Cyclooctene
Authors: Inoue Yoshihisa , Yamada Tatsuya , Daino Yoshihiko , Kobata Tomokazu , Yamasaki Noritsugu , Tai Akira , Hakushi Tadao 
Published: May 2006

Abstract
In the triplet-sensitized photoisomerization, the photostationary trans/cis ratio of cyclooctene doubled upon lowering irradiation temperature from 25 to −78 °C, whereas the ratio of 2-octene stayed unchanged.
Isomerization Behaviors of Hexamolybdoplatinate and Heptamolybdate Polyanions in the Aqueous Solution
Authors: Park Ki Min , Lee Uk 
Published: May 2006

Abstract
The planar structure (α-isomer) ↔ bent structure (β-isomer) isomerization of [PtMo6O24]−8 and [Mo7O24]−6 polyanions in solutions of various pH as investigated by reversed-phase high-performance liquid chromatography.
Polarizing Film Prepared by Using Linear Poly(2,5-pyridinediyl)
Authors: Yamamoto Takakazu , Maruyama Tsukasa , Kubota Kenji 
Published: May 2006

Abstract
Stretching of poly(vinyl alcohol) film containing poly(2,5-pyridinediyl) in its surface region gives a film which shows an excellent polarizing effect at about 400 nm. Poly(2,5-pyridinediyl) with higher molecular weight gives higher polarizing effect.
A New Facile Method for Construction of β-Arylpyrrolidine Rings and Its Application to Synthesis of (±)-Mesembrine
Authors: Shono Tatsuya , Terauchi Jun , Matsumura Yoshihiro 
Published: May 2006

Abstract
Lewis acid treatment of dimethyl N-methoxycarbonyl-N-methoxymethylaminomalonate together with aryl olefins afforded α,α,N-tris(methoxycarbonyl)-β-arylpyrrolidines, and one of the products was successfully converted to (±)-mesembrine.
High Activity and Selectivity of Sulfided CoNaA Zeolite for Isomerization of 1-Butene
Authors: Sugioka Masatoshi , Nakayama Shin-ichi , Uchida Daisuke , Kanazuka Takaji 
Published: May 2006

Abstract
The effect of sulfiding with H2S on the catalytic activity and selectivity of CoNaA zeolite in the isomerization of 1-butene was investigated. High activity and selectivity to trans-2-butene were obtained by sulfiding of CoNaA zeolite with H2S.
Palladium Catalyzed Alkenylation of 1-Siloxycyclopent-2-ene Leading to Enol Silyl Ether of 3-Alkenylcyclopentanones
Authors: Torii Sigeru , Okumoto Hiroshi , Kotani Takayuki , Akahoshi Fumihiko 
Published: May 2006

Abstract
Palladium catalyzed coupling reaction of alkenyl halides and silylated cyclopentenol in the presence of potassium carbonate produced the corresponding enol silyl ether of 3-alkenylcyclopentanones regioselectively.
Hydrogenolysis of α,β-Epoxyketone and Ester to Aldol in Pd(0)/HCOOH/Et3N and H2/Pd/C Reduction Media
Authors: Torii Sigeru , Okumoto Hiroshi , Nakayasu Seizo , Kotani Takayuki 
Published: May 2006

Abstract
Hydrogenation of α,β-epoxycarbonyl compounds by using several catalysts and hydride sources was studied to obtain the corresponding β-hydroxy substrates.
C–C Bond Formation at α to a Trifluoromethyl Group. Cyanation and Allylation of α-Trifluoromethylated N,O-Acetals
Authors: Fuchigami Toshio , Ichikawa Shinji , Konno Akinori 
Published: May 2006

Abstract
α-Trifluoromethylated N,O-acetals, N-(1-methoxy-2,2,2-trifluoroethyl)anilines readily reacted with cyanosilane and allylsilane in the presence of a Lewis acid to efficiently provide the corresponding trifluoromethylated α-aminonitrile and homoallylamine derivatives, respectively. α-Difluoromethyl-α-aminonitriles were also similarly prepared in high yields using α-difluoromethylated N,O-acetals.
Novel Diastereotopic Isomerism of a Styrene Complex of Pt(II) Containing the η3-Methallyl Ligand
Authors: Kurosawa Hideo , Ikeda Isao 
Published: May 2006

Abstract
The 1H NMR NOE experiments on Pt(η3-CH2CMeCH2)(styrene)(C6F5) indicated that the configuration of the major isomer in CDCl3 solution is similar to that in the solid state determined previously by X-ray analysis. The minor isomer corresponds to a diastereomer of the major isomer, where both isomers contain the C=C bond lying almost in the coordination plane. The interconversion between the two isomers was suggested to be an intramolecular process.
Recognition of Tetralin Hydroperoxide by Cyclodextrins
Authors: Asakura Kouichi , Tanaka Nobutoshi , Matsumura Shuichi , Yoshikawa Sadao 
Published: May 2006

Abstract
The recognition ability of α-, β- and γ-cyclodextrins (CDs) to tetralin hydroperoxide is discussed. CDs formed inclusion complexes more predominantly with tetralin hydroperoxide than with tetralin. The most noticeable specificity was found when β-CD was used as a host. Inclusion complexes of CDs with tetralin were also prepared and their molar ratios were determined.
Palladium(II)-catalyzed Alkoxylation and Acetoxylation of Alkenes
Authors: Hosokawa Takahiro , Shinohara Toru , Ooka Yoshiharu , Murahashi Shun-Ichi 
Published: May 2006

Abstract
Addition of alcohols or acetic acid to alkenes activated by carbonyl or acetal is catalyzed by PdCl2(MeCN)2 to give the corresponding ethers and esters.
Marked Differences in Molecular Association Behavior between Two Regioisomers of γ-Cyclodextrin Derivatives Bearing a Pyrenecarbonyl Moiety at C-2 and C-3
Authors: Suzuki Iwao , Ueno Akihiko , Osa Tetsuo 
Published: May 2006

Abstract
γ-Cyclodextrin derivatives bearing a pyrenecarbonyl moiety at C-2 and at C-3 (1 and 2, respectively) showed marked differences in the fluorescence spectra; 1 exhibits remarkable excimer emission whereas 2 exhibits almost pure monomer emission, suggesting that 1 forms a stable association dimer while 2 exists as a monomer species. Upon addition of 1-borneol, the association dimer of 1 was converted into a 1:1 host-guest complex with the binding constant, 5.1-fold larger than that of 2.
Diazotization of 2-Methyl-2-(1,2,3,4-tetrachloro-9-triptycyl)propylamine Rotamers. A Consequence of Participation of 1-Chloro Substituent during the Formation of Alkyl Cation in the sc-Isomer
Authors: Tanaka Yasuhiro , Yamamoto Gaku , Oki Michinori 
Published: May 2006

Abstract
Diazotization of the ap form of the title compound in benzene with isopentyl nitrite in the presence of acetic acid afforded a mixture of olefins, which were expected from deprotonation reactions of the cation formed by the Wagner–Meerwein rearrangement, while the sc isomer afforded 2-methyl-2-(1,2,3,4-tetrachloro-9-triptycyl)propyl acetate. Participation of the 1-chloro group in stabilization of the cation formed by diazotization was invoked.
A Preparative Route to 2-Substituted 1,1-Diphenylthio Cyclobutanes
Authors: Kwon Tae Woo , Smith Michael B 
Published: May 2006

Abstract
Treatment of 1-phenylthiocyclopropylcarbinyl alcohols with thiophenol and HBr/ZnBr2 gives 2-alkyl (and 2-aryl) 1,1-diphenylthiocyclobutanes.
N-Formylation of Aliphatic Primary Amines with N,N-Dimethylformamide Promoted by 2,3-Dihydro-1,4-phthalazinedione
Authors: Iwata Masaaki , Kuzuhara Hiroyoshi 
Published: May 2006

Abstract
The N-formylation of aliphatic primary amine proceeded very effectively in N,N-dimethylformamide in the presence of restorable 2,3-dihydro-1,4-phthalazinedione.
Diastereofacial Controlled Addition Reaction of Alkoxymethylketones Modified by (2R,4R)-2,4-Pentanediol with Organometallics
Authors: Fujisawa Tamotsu , Watai Toshiyuki , Sugiyama Takeshi , Ukaji Yutaka 
Published: May 2006

Abstract
Oxygen functionalized chiral alkoxymethylketone, derived from (2R,4R)-2,4-pentanediol, provided an efficient chiral environment in the reaction with organometallics which resulted in the either stereoselection depending on metal used; i.e., the reactions with MeLi and MeTi(OiPr)3 selectively furnished the corresponding (S)-and (R)-tertiary alcohols, respectively.
Epoxidation of α,β-Unsaturated Carboxylic Acids with Hydrogen Peroxide by Heteropoly Acids
Authors: Oguchi Takahito , Sakata Yasuyuki , Takeuchi Naotoshi , Kaneda Kimio , Ishii Yasutaka , Ogawa Masaya 
Published: May 2006

Abstract
The epoxidation of α,β-unsaturated carboxylic acids with 35%-H2O2 was carried out by the use of heteropoly acids (HPA) as catalyst. Among the HPA examined, CWP, prepared from 12-tungstophospholic acid (WPA) and cetylpyridinium chloride (CPC), was found to be the most efficient catalyst. The CWP-H2O2system provides an alternative method to prepare epoxy acids.
Diastereoselective Addition of Organometallics to N-(α-Ketoacyl)-trans-2,5-bis(methoxymethoxymethyl)pyrrolidine
Authors: Kawanami Yasuhiro , Fujita Izumi , Ogawa Shiho , Katsuki Tsutomu 
Published: May 2006

Abstract
The nucleophilic addition of organometallics to α-keto amides having (2R,5R)-trans-2,5-bis(methoxymethoxymethyl)pyrrolidine as a chiral auxiliary was studied and it was found that the sense and degree of diastereoselection strongly depended on organometallics and the reaction conditions used and that the diastereomeric hydroxy amides was obtained with high stereoselectivity by the choice of appropriate reaction conditions.
A Highly Enantioselective Synthesis of 2-Substituted Malates by Asymmetric Aldol Reaction
Authors: Kobayashi Shu , Fujishita Yuko , Mukaiyama Teruaki 
Published: May 2006

Abstract
In the presence of a chiral promoter consisted of chiral diamine coordinated tin(II) triflate and tributyltin fluoride, silyl enol ether of S-ethyl ethanethioate reacts with α-ketoesters to afford the corresponding aldol-type adducts, 2-substituted malates, in good yields with excellent enantiomeric excesses.
A Tungsten Carbonyl Complex [W(CO)(Ph2PCH2CH2PPh2)2] Present as a Mixture of Two Species Having Agostic Interaction or Ortho-Metallation and Its Reaction with Hydrogen Gas
Authors: Ishida Toyohisa , Mizobe Yasushi , Hidai Masanobu 
Published: May 2006

Abstract
A tungsten carbonyl complex [W(CO)(dpe)2] (dpe = Ph2PCH2CH2PPh2) exists in solution as a mixture of two species, one of which has an agostic interaction and the other has an ortho-metallation between one ortho hydrogen of the dpe ligand and the tungsten atom. This carbonyl complex reacted with H2 gas to give a dihydrido complex [WH2(CO)(dpe)2].
Energy Barriers for the Ring Inversion of 1,2:3,4:5,6-Tris(bicyclo[2.2.2]octeno)- and 1,2,3,4,5,6-Hexamethylcycloheptatrienes
Authors: Aonuma Shuji , Komatsu Koichi , Takeuchi Ken’ichi 
Published: May 2006

Abstract
The energy barriers for the cycloheptatriene ring inversion of the titled compounds were determined by dynamic NMR method. It was clarified that annelation with three rigid bicyclooctene units brings about much less steric destabilization to the planar form of the ring as compared with substitution with six methyl groups. This result was supported by molecular mechanics calculations.