bluuebunny/crossref_metadata_2025_split huggingface dataset:
1,2-Migration of Fluorine Atom in CH2FCF2 Radical Produced by the Addition of a Hydrogen Atom to Trifluoroethylene
Authors: Kohida Tomoyuki , Kotaka Masahiro , Sato Shin , Ishida Toru , Yamamoto Keiji , Yamazaki Takashi , Kitazume Tomoya 
Published: July 2006

Abstract
The reaction of hydrogen atoms with trifluoroethylene has been studied at room temperature by using the mercury photosensitized decomposition of hydrogen as the source of hydrogen atoms. Product analyses using gas chromatography and 1H and 19F NMR spectroscopy confirmed the 1,2-migration of a fluorine atom in the CH2F\dotCF2 radical produced by the addition of a hydrogen atom to trifluoroethylene. The rate constant of the migration was estimated to be 2×1010 s−1 from the pressure dependence of the five kinds of hexafluorobutanes produced. NMR parameters for these fluorinated compounds were determined.
Mixed Alcohol Synthesis from CO–H2 by Use of KCl-Promoted Mo/SiO2 Catalysts
Authors: Muramatsu Atsushi , Tatsumi Takashi , Tominaga Hiro-o 
Published: July 2006

Abstract
Highly active Mo catalysts for mixed alcohol synthesis were prepared using Fuji Davison ID silica gel as a carrier. KCl promoted the selectivity to alcohols but reduced CO conversions in particular to hydrocarbons. Productivity of alcohols was largely affected by the reaction conditions. High pressure and short contact time enhanced space-time yield of alcohols, i.e. 420 g (kg-catalyst)−1 h−1 at 5.0 MPa, 573 K, and W/F=1.4 g-catalyst h mol−1. The presence of K effectively prevented the complete reduction of Mo to metal, resulting in the increase in the production of alcohols. The study on addition of ethene and ethanol to synthesis gas revealed that the other roles of K are to retard dehydration of alcohols to alkenes and their hydrogenation to alkanes.
Regio- and Stereoselective Introduction of Functional Groups into 1-Isoindolinone and 1(2H)-Isoquinolone Systems
Authors: Noguchi Michihiko , Yoshioka Manabu , Kakimoto Shinji , Kajigaeshi Shoji 
Published: July 2006

Abstract
The oxidation of 3a,4-dihydro-1-isoindolinone derivatives with MCPBA was carried out regio- and stereoselectively to afford the 5,6-epoxide products 2. The ring opening reaction of 2 with amines, alcohols, and sodium azide gave homoallyl alcohol type of products, derived from the ring opening at C-5 of 2. Lithium (cyano-C)methylcuprate reacted with 2 to give homoallyl and/or allyl alcohol, which is due to the conjugate addition to the C-7a position. This approach for selective introduction of functional groups into the heterocycles was extended for 3,4,4a,5-tetrahydro-1(2H)-isoquinolone system.
Synthesis, Properties, and Reactivity of (1H,1H-Perfluoroalkyl)- and (1H-Perfluoro-1-alkenyl)aryliodonium Triflates and Their Analogs
Authors: Umemoto Teruo , Gotoh Yoshihiko 
Published: July 2006

Abstract
(1H,1H-Perfluoroalkyl)phenyl- and -(p-fluorophenyl)iodoniurn triflates, fluorosulfate, sulfate (3)–(7) were synthesized in good yields by the oxidation of 1-iodo-1H,1H-perfluoroalkanes (RfCH2I) with trifluoroperacetic acid followed by treatment with triflic acid and benzene or fluorobenzene. (1H,1H,5H,5H-Perfluoropentane-1,5-diyl)bisphenylbisiodonium triflate was synthesized similarly. (trans-1H-Perfluoro-1-alkenyl)phenyliodonium triflates (11) were synthesized by dehydrofluorination of 3 with a base in good yields. Thermolysis of 3 produced 1H,1H-perfluoroalkyl triflate and iodobenzene, while 11 gave (Z)-1-iodo-1H-perfluoro-1-alkene and phenyl triflate. The thermolysis experiment, including (perfluoroalkyl)phenyliodonium triflate (17), demonstrated that the C–I bond strength of the trivalent iodine compounds increased in the order of RfCH2–I, Rf–I&lt;Ph–I&lt;RfCF=CH–I. The ionic mechanism containing RfCH2+, Ph+, and Rf+ for the thermal decomposition of 3, 11, and 17, respectively, was proposed. The reactivities of 3 and 11 to such nucleophiles as phenoxide, alkoxide, and alkanethiolate anions were studied and compared with that of 17. Remarkable changes in the reactivity were found depending on the nature of the fluoro-alkyl and -alkenyl groups. The reaction of 11 with the oxide anions yielded (2-phenoxy- and -alkoxy-1H-perfluoro-1-alkenyl)phenyliodonium triflates.
Peroxy Acid Oxidations. I. A Kinetic and Mechanistic Study of Oxidation of Acetylacetone by Peroxomonophosphoric Acid and Hydrogen Peroxide in Alkaline Medium
Authors: Patnaik Chakrapani P , Mohapatro Surendra Nath , Panigrahi Akhil Krishna , Panda Radhasyam S 
Published: July 2006

Abstract
The kinetics of oxidation of acetylacetone by peroxomonophosphoric acid and hydrogen peroxide have been investigated in the pH range 8–13.7. The oxidations by peroxomonophosphoric acid at 308 K and I=0.6 mol dm−3 follow the rate expressions,
(i) −\fracd[PMPA]Tdt={k1[A]+k2[A−]}[HPO52−]
in the pH range 8–10.63, where k1=1.96 dm3 mol−1 s−1 and k2=0.177 dm3 mol−1 s−1, and
(ii) −\fracd[PMPA]Tdt={k3[A]+k4[A−]}[HPO52−]+{k5[A]+k6[A−]}[PO53−]
in the pH range 11.5–13.7, where k3=30.4 dm3 mol−1 s−1 and k6≈0. The rate law for hydrogen peroxide oxidations in the pH range 9.2–13 at 308 K and I=0.1 mol dm−3 is given by,
−\fracd[Hydrogen peroxide]Tdt={k7[A]+k8[A−]}[H2O2]+{k9[A]+k10[A−]}[HO2−]
the k7 and k10 values being 0.393 dm3 mol−1 s−1 and 0.143×10−2 dm3 mol−1 s−1 respectively. A and A− represent the diketo and enol form of acetylacetone respectively. The kinetic data and activation parameters are consistent with nucleophilic attack by peroxo species on both diketo and enol form of acetylacetone followed by oxygen–oxygen bond fission.
Palladium Catalyzed Hydrostannylation and Hydrogermylation of Acetylenes
Authors: Ichinose Yoshifumi , Oda Hiroji , Oshima Koichiro , Utimoto Kiitiro 
Published: July 2006

Abstract
Treatment of acetylenes with Ph3SnH or Ph3GeH in the presence of a catalytic amount of Pd(PPh3)4 provides the corresponding alkenyltriphenylstannanes or alkenyltriphenylgermanes in good yields.
The Phase Transitions of 1-Alkyl-1-azoniabicyclo[2.2.2]octane Bromides, Cn–ABCO–Br (10≤n≤22)
Authors: Imamura Kengo , Nogami Takashi , Shirota Yasuhiko 
Published: July 2006

Abstract
The phase transitions of a series of 1-alkyl-1-azoniabicyclo[2.2.2]octane bromides were studied on the basis of DSC, the measurements of the ionic conductivities of the bromide anion, and Raman spectroscopy. Most of the materials exhibited three endothermic signals at Tc1, Tc2, and Tc3 (Tc1&lt;Tc2&lt;Tc3) when they were heated. The temperature dependence of the ionic conductivities of the bromide anion showed conductivity jumps by a factor of 2–4 at around Tc3. In order to clarify the phase transition, the temperature dependences of the Raman spectra were measured. It was found that the phase transition at Tc1 is caused by the molecular rearrangement in the solid, while the transitions at Tc2 and Tc3 are caused by both the conformational change in the alkyl chain and the rotational motion of the ABCO portion.
Syntheses of 23-C-Substituted Derivatives of Mycaminosyl Tylonolide and 4′-Deoxymycaminosyl Tylonolide
Authors: Sakamoto Shuichi , Kajikawa Norio , Tsuchiya Tsutomu , Umezawa Sumio 
Published: July 2006

Abstract
23-C-Substituted derivatives of mycaminosyl tylonolide (MT) and 4′-deoxymycaminosyl tylonolide (DT) have been prepared by the reaction of protected 23-aldehyde derivatives, 2′,4′-di-O-acetyl-3-O-t-butyldimethylsilyl-23-deoxy-23-oxomycaminosyl tylonolide diethyl acetal (5) and 2′-O-acetyl-3-O-t-butyldimethylsilyl-23,4′-dideoxy-23-oxomycaminosyl tylonolide diethyl acetal (26), with several Grignard reagents and methyllithium. The final products were (23S)- and (23R)-23-C-methyl (13a, 13b), -ethyl (14a, 14b), -butyl (15a, 15b), -phenyl (16b, 16a), -allyl (17a, 17b), -vinyl (18a, 18b), -ethynyl (19b, 19a) derivatives of MT, and (23S)- and (23R)-23-C-methyl (28a, 28b), -vinyl (29a, 29b), and -ethynyl (30b, 30a) derivatives of DT. Their configurations at 23-position were determined by the NOE difference spectroscopy on 13a and 13b.
Battle River Coal Liquefaction and Its Co-Processing with Tar-Sand Bitumen
Authors: Yoshida Ryoichi , Miyazawa Makoto , Maekawa Yosuke 
Published: July 2006

Abstract
Battle River coal from Canada shows an excellent applicability to liquefaction. At 450 °C, anthracene oil and Cold Lake tar-sand bitumen show the solvent effect as a vehicle oil in the initial stage of liquefaction. A definite advantage is gained by tar-sand bitumen co-processing, where hydrogen consumption is comparatively lower than that of anthracene oil derived from coal to produce a similar yield of oil.
Structure, Properties, and Na+ Transport Membrane of Polyelectrolyte Complexes Consisting of Glycol Chitosan and Poly(vinyl sulfate)
Authors: Kikuchi Yasuo , Kubota Naoji 
Published: July 2006

Abstract
Glycol chitosan (GC) was allowed to react with poly(vinyl sulfate) (PVSK) to form many different water-insoluble polyelectrolyte complexes (PECs) in aqueous solution at various hydrogen ion concentrations. According to elemental analyses, IR spectroscopy, and solubilities of PECs, molecular structures of each PEC depend on [H+]. This result is attributable to change with [H+] in the degree of dissociation and conformation of GC and PVSK. PEC membranes were made by casting solutions of all kinds of PECs, and transport phenomena through a membrane of the PEC prepared in a solution of 4v/v% HCl were investigated under various conditions. The transport ratio of Na+ and the electric potential difference between the left and right sides of the membrane were measured, with a result that the higher value the membrane potential difference was long allowed to maintain, the higher the transport ratio became. According to this result, the driving force of transport is dependent on the membrane potential, Donnan potential and diffusion potential, between both sides of the membrane. The Cl− exclusion (Donnan exclusion), however, is small due to the small cation-exchange capacity, so that the membrane potential difference is caused to decrease rather rapidly by Cl− permeation.
The Microwave Spectra, Dipole Moments, and Two Isomers of Cyclopentadiene-1-carbonitrile
Authors: Sakaizumi Takeshi , Kikuchi Hiromi , Ohashi Osamu , Yamaguchi Ichiro 
Published: July 2006

Abstract
The microwave spectra of two isomers of cyclopentadiene-1-carbonitrile generated by the pyrolysis of 1H-benzotriazole have been observed in the frequency range from 8.0 to 40.0 GHz. The rotational constants (MHz) have been determined as A=8353.7(9), B=1904.24(1), and C=1565.38(1) for 1,3-cyclopentadiene-1-carbonitrile, and A=8235.0(13), B=1902.07(2), and C=1559.67(2) for 1,4-cyclopentadiene-1-carbonitrile. The dipole moments (Debye) obtained are μa=4.15(15), μb=0.27(3), and μtotal=4.16(17) for 1,3-cyclopentadiene-1-carbonitrile and μa=4.36(25), μb=0.77(10), and μtotal=4.42(35) for 1,4-cyclopentadiene-1-carbonitrile.
Preparation of Methyl 2-Arylpropanoates by the Reaction of 2-Hydroxypropiophenone Dimethyl Acetals with Sulfuryl Chloride in the Presence of an Amide or a Weak Base
Authors: Yamauchi Takayoshi , Hattori Kaneaki , Nakao Kenji , Tamaki Kentaro 
Published: July 2006

Abstract
Treatment of 2-hydroxypropiophenone dimethyl acetals [p-RC6H4C(OMe)2CH(OH)Me] (1; R=H, i-Bu, OMe, Ph, Br) with sulfuryl chloride in the presence of an amide or a weak base affords methyl 2-arylpropanoates (2) in good to excellent yields via 1,2-aryl migration of 1. The hydrolysis of 2 leads to the corresponding acids, some of which are pharmaceutically important compounds having nonsteroidal anti-inflammatory and analgesic activities. The aryl migration proceeds stereospecifically with complete inversion of configuration at the β-carbon atom.
Simple Generation of Nonstabilized Azomethine Ylides through Decarboxylative Condensation of α-Amino Acids with Carbonyl Compounds via 5-Oxazolidinone Intermediates
Authors: Tsuge Otohiko , Kanemasa Shuji , Ohe Masayuki , Takenaka Shigeori 
Published: July 2006

Abstract
Heating α-amino acids with a variety of carbonyl compounds generates N-unsubstituted or N-substituted azomethine ylides of nonstabilized types through the elimination of water and carbon dioxide. The ylides are captured by olefinic, acetylenic, and carbonyl dipolarophiles producing pyrrolidines, pyrrolines, and oxazolidines. The reaction involves intermediary 5-oxazolidinones which can be sometimes isolated. Some synthetic equivalents of parent azomethine ylide, methaniminium methylide, are accessible by this route.
Asymmetric Induction in the Base-Catalyzed Reactions Using Polymer-Supported Quinines with Spacer Groups
Authors: Inagaki Minoru , Hiratake Jun , Yamamoto Yukio , Oda Jun’ichi 
Published: July 2006

Abstract
New polymer-supported quinines having the spacer groups were synthesized and utilized for three types of base-catalyzed asymmetric reactions. Insertion of the spacer groups leads to improve the stereoselectivity in comparison with the polymer-catalyst with no spacer groups.
The Magnetic Field Effects on Electrolysis. The Anodic Oxidation of Phenylacetate Ion
Authors: Watanabe Takeshi , Tanimoto Yoshifumi , Nakagaki Ryoichi , Hiramatsu Mitsuo , Nagakura Saburo 
Published: July 2006

Abstract
In anodic oxidation of the phenylacetate ion, the formation yield of benzaldehyde increases by about 40% in the presence of a magnetic field (0.67 T), while 1,2-diphenylethane is insensitive to the field. The results are interpreted in terms of the magnetohydrodynamic mechanism.
Syntheses and Characterization of Dinuclear Manganese(II,II) and Manganese(II,III) Complexes with Phenolate and Two Carboxylate Bridges
Authors: Suzuki Masatatsu , Mikuriya Masahiro , Murata Shuji , Uehara Akira , Oshio Hiroki , Kida Sigeo , Saito Kazuo 
Published: July 2006

Abstract
Dinuclear manganese(II,II) and (II,III) complexes, [Mn2(L-py)(RCOO)2]ClO4·nH2O and [Mn2(L-py)(RCOO)2](ClO4)2·nH2O, were prepared, where L-py is 2,6-bis[bis(2-pyridylmethyl)aminomethyl]-4-methylphenolate(1–) and RCOO denotes CH3COO or C6H5COO. X-Ray structure analysis of the mixed valence complex [Mn2(L-py)(C6H5COO)2](ClO4)2·H2O revealed that the complex cation involves octahedral manganese(II) and manganese(III) centers with N3O3 donor sets and that the two metal ions are linked by phenolato and two benzoato groups. Magnetic susceptibility measurements over temperature range 80–300 K indicated that both manganese(II,II) and (II,III) complexes exhibit weak antiferromagnetic interaction with spinexchange coupling constant, J=−5–−7 cm−1. Cyclic voltammograms of the mixed valence complexes showed two quasi-reversible redox couples at ca. 0.5 and ca. 1.0 V (vs. SCE), assignable to the redox reactions of MnII–MnIII/MnII–MnII and MnIII–MnIII/MnII–MnIII, respectively. The comproportionation constants for the reaction (MnIII–MnIII)+(MnII–MnII)\ightleftarrows2(MnII–MnIII at 20°C were estimated as 2–3×109.
The Solid-Phase 13C NMR Spectra of Several Tropolone Derivatives
Authors: Mori Akira , Sugiyama Shigeru , Mametsuka Hiroaki , Tomiyasu Kazushi , Takeshita Hitoshi 
Published: July 2006

Abstract
The solid-phase 13C NMR spectra of o-, m-, and p-hydroxytropolones were measured. In the solid state, the hydrogen shift between the C-1 and C-2 oxygens was frozen under the NMR time-scale; the major tautomer of the o-hydroxytropolone was shown to the 2,7-dihydroxytropone form, which was parallel to the previous assignment deduced from the IR spectroscopy. In addition, the solid-phase 13C NMRg of o-bromotropolone showed it to be 7-bromo-2-hydroxytropone.
Practical, Stereocontrolled Synthesis of Polyfluorinated Artificial Pyrethroids
Authors: Fujita Makoto , Kondo Kiyosi , Hiyama Tamejiro 
Published: July 2006

Abstract
Practical and stereocontrolled approaches to polyfluorinated synthetic pyrethroids based on aldehyde addition of CF3CCl2ZnCl are described. The zinc reagent was allowed to react with 3-formyl-2,2-dimethylcyclopropanecarboxylates (6) to give the corresponding adducts. These were acetylated and then reduced again with zinc to afford (1R*, 3S*)-3-(2-chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethylcyclopropanecarboxylates (12). The (1R*, 3R*)-isomer was derived from 2,2-dichloro-1,1,1-trifluoro-5-methyl-4-hexen-3-ol by diazoacetylation, Cu(II)-catalyzed intramolecular carbene addition, and finally by the zinc reduction. An alternative access to 12 and its halogen homologues of the (Z)-pyrethroids involves addition of 1-halo-2,2-difluoroethenyl group across the CHO group of 6 and subsequent regio- and stereoselective halogenation.
Synthesis of Pyrano[4,3-c]pyrazol-4(1H)-ones and -4(2H)-ones from Dehydroacetic Acid. Homo- and Heteronuclear Selective NOE Measurements for Unambiguous Structure Assignment
Authors: Cantos Albert , March Pedro de , Moreno-Mañas Marcial , Pla Anna , Sanchez-Ferrando Francisco , Virgili Albert 
Published: July 2006

Abstract
Cyclization of dehydroacetic acid N-substituted hydrazones furnished 1-substituted 3,6-dimethylpyrano[4,3-c]pyrazol-4(1H)-ones, together with varying amounts of N,N′-disubstituted 5-hydroxy-3-methyl-4-(3-methyl-1H-pyrazol-5-yl)-1H-pyrazoles. The same pyranopyrazolones were obtained regioselectively without side reactions from N-alkylhydrazines and 4-chloro-3-(1-chlorovinyl)-6-methyl-2H-pyran-2-one, (“Dehydroacetchlorid”), while N-arylhydrazines gave the 2-aryl-3,6-dimethylpyrano[4,3-c]pyrazol-4(2H)-ones. NMR NOE methods, including long-range selective heteronuclear 13C{1H} NOE enhancement measurements, allowed unambiguous distinction between -4(1H)-ones and -4(2H)-ones.
Reactions of Tropone Tosylhydrazone Sodium Salt with 2-Pyrone Derivatives: Nucleophilic Addition of 1,2,4,6-Cycloheptatetraene to 2-Pyrone Derivatives
Authors: Saito Katsuhiro , Ishihara Hiraku 
Published: July 2006

Abstract
The reaction of tropone tosylhydrazone sodium salt with 3- or 5-methoxycarbonyl-2-pyrones afforded benzotropilidene derivatives. These products are considered to be formed via addition reactions of the 2-pyrone derivatives with 1,2,4,6-cycloheptatetraene derived from cycloheptatrienylidene, which is the initial product of the decomposition of tropone tosylhydrazone sodium salt.
The Solvation Effect on the Reactions in Solution. I. The Solvation Model for the Interpretation of Entropy Changes in the Complex Formation of Dichlorodimethylstannane with Pyridine
Authors: Fujiwara Hideaki , Arakawa Hiroyuki , Murata Saburo , Ohtaku Ikuzi , Ishii Motoko , Sasaki Yoshio 
Published: July 2006

Abstract
A complex-formation reaction has been studied for the Me2SnCl2 plus pyridine system in dimethyl phthalate (DMP) and dioctyl phthalate (DOP) by means of titration calorimetry. The resulting entropy changes in the reactions of A+B=AB and AB+B=AB2, with A=Me2SnCl2 and B=pyridine, were compared with those calculated for the gas-phase reactions. The values in solution amounted only to 1/3–1/4 of the gas-phase values. Correction for the entropy of solution of each component failed to explain the observed values in the absence of a strong solvation. The solvation model is presented to allow for such a discrepancy, assuming a strong solvation for Me2SnCl2 as well as for the 1:1 pyridine complex by definite numbers of solvents. To test the applicability of the model, calculations were made based on molecular statistical thermodynamics. The results obtained were reasonable, indicating that a free molecule, Me2SnCl2, is solvated by 1.3 molecules of the solvent of DMP, which are released about half by half on the formation of the 1:1 and 1:2 complexes with pyridine.
Oxygen-17 NMR Study of the Uranyl Ion. IV. 17O Nuclear Magnetic Relaxation and Chemical Shifts of Uranyl Oxygen Atoms and Coordinated Water
Authors: Jung Woo-Sik , Tomiyasu Hiroshi , Fukutomi Hiroshi 
Published: July 2006

Abstract
17O nuclear magnetic relaxation times and chemical shifts of uranyl oxygen atoms (hereafter uranyl oxygens) and solvent water have been measured with changing concentration of the uranyl ion in aqueous solution. The 17O resonance of the water molecule in the first-coordination sphere is determined to be at 90.1±1.2 ppm relative to free water at 25 °C. The effective correlation time for the 17O quadrupolar relaxation of the coordinated water, which corresponds to the reorientation time for the hydrated uranyl ion, is about 8.7 times that of free water. The 17O spin-lattice relaxation times (T1) of uranyl oxygens have been measured at 25 °C. From the 17O T1 values the 17O nuclear quadrupole coupling constant of uranyl oxygens has been estimated to be 0.44 MHz. This small value implies the high symmetry of electron distribution around uranyl oxygens.
Pressure and Temperature Effects on Octahedral–Tetrahedral Equilibria in 3-Methylpyridine Solutions of Some Cobalt(II) Halides
Authors: Kojima Kazuo 
Published: July 2006

Abstract
The visible absorption spectra of CoX2 (X=Cl, Br) in 3-methylpyridine (3-Me-py) solutions have been measured in the pressure range of 1 bar—3 kbar at room temperature, and in the temperature range of ≈5–≈76 °C at 1 bar. The equilibrium, [CoX2(3-Me-py)2] (tetrahedral)+2(3-Me-py)\ightleftharpoons[CoX2(3-Me-py)4] (octahedral), is found to be followed over this pressure range. Higher pressures favor the octahedral species with the volume changes −18–−19 cm3 mol−1 at 1 bar. On the other hand, the above equilibrium holds fairly well at temperatures up to about 40 °C. Higher temperatures favor the tetrahedral species, the heats of reaction, being 56.7 kJ mol−1 (5.0–44.8 °C) and 58.6 kJ mol−1 (4.8–34.2 °C) for the chloro and bromo complexes, respectively. An intense and broad band appears around 400 nm at elevated temperatures especially for the bromo complex solution. This band may be assigned to a charge-transfer band occurring in a contact ion pair of solvent molecule 3-Me-py with X− arising from the dissociation of the tetrahedral species [CoX2(3-Me-py)2].
Carbon-13 NMR and IR Spectroscopic Studies on Some 7-Oxabicyclo[2.2.1]heptanes and -heptenes. n–π Interaction and Hydrogen Bonding
Authors: Senda Yasuhisa , Ohno Akihiko , Ishiyama Jun-ichi , Imaizumi Shin , Kamiyama Shin-ichi 
Published: July 2006

Abstract
The 13C NMR spectra of diastereomeric pairs of the title compounds together with some tetrahydrofurans were examined and the chemical shifts were compared with those for the corresponding bicyclo[2.2.1]heptanes and -heptenes. The intramolecular interaction between the n-orbital of an oxygen atom and the π-orbital of an olefinic bond was found in 2-methylene-7-oxabicyclo[2.2.1]heptane. Intramolecular hydrogen bonding between the 7-oxygen and the hydroxyl group occurs in exo-7-oxabicyclo[2.2.1]heptane-2-methanol.
Functionalization of 2-Deoxy-2,3-dehydro-N-acetylneuraminic Acid Methyl Ester
Authors: Okamoto Kaoru , Kondo Tadao , Goto Toshio 
Published: July 2006

Abstract
The acetyl protected 2-deoxy-2,3-dehydroneuraminic acid methyl ester was functionalized by modifying its 2,3-double bond to convert it into new glycosyl donors such as 2,3-dibromo-, 2,3-epoxy-, and 2-halo-3-hydroxyneuraminic acid derivatives.
A Synthesis of Optically Active 4-Diethoxyphosphinyl-3-(1-hydroxyethyl)-2-azetidinone: A Potential Precursor to (1-Aminoalkyl)phosphonic Acid Derivatives
Authors: Shiozaki Masao , Masuko Hidekazu 
Published: July 2006

Abstract
Optically active 4-diethoxyphosphinyl-3-(1-hydroxyethyl)-2-azetidinone (8) was synthesized from (2R,3R) N-diethoxyphosphinylmethyl-2,3-epoxybutyramide derivatives, and compound 8 was alternatively synthesized from (3R,4R)-4-acetoxy-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-2-azetidinone via 3-[1-(t-butyldimethylsilyloxy)ethyl] derivative.