bluuebunny/crossref_metadata_2025_split huggingface dataset:
Highly Diastereoselective Thioglycosylation of Functionalized Peracetylated Glycosides Catalyzed by MoO2Cl2.
Authors: Weng Shiue‐Shien , Lin Yow‐Dzer , Chen Chien‐Tien 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
An Efficient Glycosidation Method Using 2,3‐Unsaturated Glycosyl Donors.
Authors: Sasaki Kaname , Matsumura Shuichi , Toshima Kazunobu 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A Ring Closing Metathesis Approach to the Indole Alkaloid Mitralactonine.
Authors: Chavan Subhash P. , Sharma Pallavi , Sivappa R. , Kalkote Uttam R. 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Total Synthesis and Stereochemical Confirmation of Manassantin A (Ia), B (Ib), and B1 (Ic).
Authors: Hanessian Stephen , Reddy Gone Jayapal , Chahal Navjot 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
The First Polyarsenic Organic Compound from Nature: Arsenicin A from the New Caledonian Marine Sponge Echinochalina bargibanti.
Authors: Mancini Ines , Guella Graziano , Frostin Maryvonne , Hnawia Edouard , Laurent Dominique , Debitus Cecile , Pietra Francesco 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Discovery of Lucensimycins A (Ia) and B (Ib) from Streptomyces lucensis MA7349 Using an Antisense Strategy.
Authors: Singh Sheo B. , Zink Deborah L. , Huber Joanne , Genilloud Olga , Salazar Oscar , Diez M. Teresa , Basilio Angela , Vicente Francisca , Byrne Kevin M. 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Asymmetric Total Synthesis of (+)‐K01‐0509 B: Determination of Absolute Configuration.
Authors: Tsuchiya Satoshi , Sunazuka Toshiaki , Hirose Tomoyasu , Mori Ryuma , Tanaka Toshiaki , Iwatsuki Masato , Omura Satoshi 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Bioactive Constituents of the Root Bark of Artocarpus rigidus subsp. rigidus.
Authors: Namdaung Umalee , Aroonrerk Nuntana , Suksamrarn Sunit , Danwisetkanjana Kannawat , Saenboonrueng Janya , Arjchomphu Wisit , Suksamrarn Apichart 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Modeling Gold/Iron Oxide Interface System
Authors: Guczi L. , Paszti Z. , Frey K. , Beck A. , Peto G. , Daroczy Cs. S. 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Oxidatively Induced Abstraction Reactions. A Synthetic Approach to Low‐Coordinate and Reactive Early Transition Metal Complexes Containing Metal—Ligand Multiple Bonds
Authors: Mindiola Daniel J. 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Shape‐Persistent Aromatic Amide Oligomers: New Tools for Supramolecular Chemistry
Authors: Li Zhan‐Ting , Hou Jun‐Li , Li Chuang , Yi Hui‐Ping 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Regioselective Functionalization of Unreactive Carbon—Hydrogen Bonds.
Authors: Daugulis Olafs , Zaitsev Vladimir G. , Shabashov Dmitry , Pham Quynh‐Nhu , Lazareva Anna 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of Butenolides by One‐Pot Cyclization Reactions of Silyl Enol Ethers with Oxalyl Chloride.
Authors: Langer Peter 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Organometallic Generation and Capture of ortho‐Arynes.
Authors: Dyke Alan M. , Hester Alison J. , Lloyd‐Jones Guy C. 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Halide and Pseudohalide Effects in Pd‐Catalyzed Cross‐Coupling Reactions
Authors: Fairlamb Ian J. S. , Taylor Richard J. K. , Serrano Jose Luis , Sanchez Gregorio 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Recent Advances in Polymeric Chiral Ligands for Asymmetric Synthesis
Authors: Itsuno Shinichi , Haraguchi Naoki , Arakawa Yukihiro 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Chiral Thiophosphoramide and Thioamide Ligands in Catalytic Asymmetric Carbon—Carbon Bond‐Formation Reactions
Authors: Zhang Wen , Shi Min 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
From Persistent Triplet Carbenes to Persistent High‐Spin Polycarbenes.
Authors: Itoh Tetsuji , Hirai Katsuyuki , Tomioka Hideo 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A Resourceful New Strategy in Organic Synthesis: Tandem and Stepwise Metathesis/Non‐Metathesis Catalytic Processes.
Authors: Dragutan Valerian , Dragutan Ileana 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Photomechanics of Liquid‐Crystalline Elastomers and Other Polymers
Authors: Ikeda Tomiki , Mamiya Jun‐ichi , Yu Yanlei 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Dissecting Non‐Ribosomal and Polyketide Biosynthetic Machineries Using Electrospray Ionization Fourier‐Transform Mass Spectrometry
Authors: Dorrestein Pieter C. , Kelleher Neil L. 
Published: March 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Studies on the Uptake of Glucose Derivatives by Red Blood Cells
Authors: García‐Álvarez Isabel , Garrido Leoncio , Fernández‐Mayoralas Alfonso 
Published: March 2007

AbstractErythrocytes express the same glucose transporter (GLUT‐1) as is present in the blood‐brain barrier. With the aim of testing the viability of using this transport system to deliver glucosyl drug derivatives to the brain, the uptake of several dopamine–glucose conjugates and a few structurally related analogues by erythrocytes was studied with HPLC and 1H MAS NMR spectroscopy. The results showed that slight structural changes determine the uptake of glycoconjugates by red blood cells. However, experiments in the presence of glucose transport inhibitors showed that none of the conjugates that efficiently crossed the cell membrane were transported by GLUT‐1.
Topology and graph products; eigenproblems in optimal structural analysis
Authors: Kaveh A. , Rahami H. 
Published: March 2007

AbstractIn this paper, a topological method is presented to obtain the eigensolution of a cylindrical‐shaped grid from those of a plane grid. Similarly, the eigenproperty of a torus‐shaped grid is calculated from those of a cylindrical‐shaped grid. These transformations are performed using an identification approach employed in topology for the formation of different surfaces. The proven theorems simplify the evaluation of the eigenvectors to be employed in the ordering and graph partitioning of regular structures for optimal analysis. Copyright © 2007 John Wiley & Sons, Ltd.
Minimal history, a theory of plausible explanation
Authors: Mayfield John E. 
Published: March 2007

AbstractIn computational theory, time is defined in terms of steps, and steps are defined by the computational process. Because steps can be described, a computation can be recorded as a binary string. This allows time to be measured in bits, which in turn, allows the definition of various computable complexity measures that account for the minimal amount of computation required to create an object from primitive beginnings. Three such measures are introduced in this article. They are “transcript depth,” which is closely relate to logical and computational depth, and “Kd complexity,” which is similar to Levin's Kt complexity, and “minimal history.” The later two measures are comprehensive in the sense that they characterize all information required for the creation of an object and also all computable internal relationships and redundancies that are present in the object. © 2007 Wiley Periodicals, Inc. Complexity 12:48–53, 2007
Thin Films of ZrO2 for High‐k Applications Employing Engineered Alkoxide‐ and Amide‐Based MOCVD Precursors
Authors: Thomas R. , Bhakta R. , Milanov A. , Devi A. , Ehrhart P. 
Published: March 2007

AbstractUltrathin ZrO2 films were deposited on SiOx/Si in a multiwafer planetary metal‐organic (MO)CVD reactor combined with a liquid delivery system. Two different alkoxide‐based precursors, [Zr(OiPr)2(tbaoac)2] and [Zr(OtBu)2(tbaoac)2] are compared with two amide‐based precursors, [Zr(NEt2)2(dbml)2] and [Zr(NEtMe)2(guanid)2]. Growth rate, surface roughness, density, and crystallization behavior are compared over a wide range of deposition temperatures (400–700 °C). In addition, the influence of the solvents, n‐butylacetate, toluene, and hexane, is discussed. The best growth results in terms of low temperature deposition rate, surface roughness, film density, and carbon content were obtained for the new [Zr(NEtMe)2(guanid)2] precursor. The electrical properties were investigated with metal–insulator–semiconductor (MIS) capacitors. The relative dielectric permittivity was in the range 17–24, depending on the precursor. Compared to standard SiO2 capacitors of similar equivalent oxide thickness, low leakage currents were obtained.
MOCVD of TaN Using the All‐Nitrogen‐Coordinated Precursors [Ta(NEtMe)3(N‐tBu)], [Ta(NEtMe)(N‐tBu){C(N‐iPr)2(NEtMe)}2], and [Ta(NMeEt)2(N‐tBu){Me2N‐N(SiMe3)}]
Authors: Baunemann A. , Lemberger M. , Bauer A. J. , Parala H. , Fischer R. A. 
Published: March 2007

AbstractThree different all nitrogen‐coordinated heteroleptic precursors, [Ta(NEtMe)3(N‐tBu)] (1), [Ta(NEtMe)(N‐tBu){C(N‐iPr)2‐(NEtMe)}2] (2), and [Ta(NMeEt)2(N‐tBu)(tdmh)] (3) (Et = ethyl, Me = methyl, tBu = tert‐butyl, iPr = isopropyl, tdmh = N‐trimethylsilyl‐N′,N′‐dimethylhydrazine) are tested in thermally activated metal–organic (MO)CVD of TaN thin films. Using 1 and 2, conducting cubic‐TaN films can be deposited (1: 4000 μΩ·cm; 2: 10000–20000 μΩ·cm), while 3 results in the formation of insulating silicon‐containing films with high levels of oxygen impurities. Raising the chemical complexity of precursors 2 and 3 with respect to 1 does not necessarily lead to high carbon incorporation, even in the absence of additional ammonia. Metal–insulator–semiconductor structures with TaN as the metal gate material are fabricated and characterized by capacitance–voltage (C–V) and current density–voltage (J–V) measurements. Precursor 3 is used to deposit insulating TaSiN(O) films in a large‐scale reactor on 150 mm prestructured metal oxide semiconductor (MOS) wafers.
A General Correction to Surface Reaction Models Based on Reactive Sticking Coefficients
Authors: Dorsmann R. , Kleijn C. R. 
Published: March 2007

AbstractFollowing the work of Coltrin et al. (Surface Chemkin III, Reaction Design, San Diego1996), many CVD models express the rate of surface reactions as the molecular flux into the surface multiplied by a reactive sticking coefficient and a correction factor that was derived by Motz and Wise (J. Chem. Phys.1960,32, 1893). According to Motz and Wise, this factor is only valid for small reactive species concentrations, a condition that is not generally fulfilled in CVD processes. Nevertheless, it is widely used in CVD modeling.In the present study, the direct simulation Monte Carlo (DSMC) method was used to determine the deviation from this theory for more general CVD process conditions. The results show that the deviation increases with increasing reactive sticking coefficient and reactant mass fraction, and a significant deviation from the theory of up to 45 % was found. A fitted correlation is presented to predict this deviation using the sticking coefficient and the reactant mass fraction for cases with a reactant mass fraction near the surface up to (approximately) 99 %.
Preparation of Doped Spinel Cobalt Oxide Thin Films and Evaluation of their Thermal Stability
Authors: Bahlawane* N. , Premkumar P. A. , Feldmann J. , Kohse‐Höinghaus K. 
Published: March 2007

AbstractSpinel cobalt oxide doped with nickel and zinc are deposited using a CVD reactor equipped with a pulsed spray evaporation system. This process allows easy control of the film composition through the adjustment of the composition of the liquid feedstock; a linear dependence is observed in both cases. Doped spinels with atomic ratios of doping‐metal to Co ranging from 0 to 0.5 are deposited and subjected to various surface characterization methods. Zinc as a doping metal, which nonselectively occupies the octahedral and the tetrahedral sites, preserves the cubic spinel structure; in contrast, nickel, which preferably occupies the octahedral sites, preserves the cubic structure only up to Ni/Co = 0.14 and then induces a tetragonal distortion. This disordered structure allows more polarons, and therefore presents a conductivity which increases substantially with the concentration of nickel in the deposited films. The thermal stability of cobalt oxide is maintained in the case of nickel doping as long as the cubic structure is preserved, and then decreases continuously with the concentration of nickel doping once the tetragonal deformation is induced. An upper thermal stability limit as low as 350 °C is observed for films with Ni/Co = 0.33. In contrast, zinc steadily improved the thermal stability with increased doping concentration, and reaches ∼850 °C, which is 200 °C higher than that of pure cobalt oxide.
A study of a routing attack in OLSR‐based mobilead hocnetworks
Authors: Kannhavong Bounpadith , Nakayama Hidehisa , Kato Nei , Jamalipour Abbas , Nemoto Yoshiaki 
Published: March 2007

AbstractA mobilead hocnetwork (MANET) is a collection of mobile nodes which are able to communicate with each other without relying on predefined infrastructures or central administration. Due to their flexibilities and easy deployment, MANET can be applied in situation where network infrastructures are not available. However, due to their unique characteristics such as open medium and the lack of central administration, they are much more vulnerable to malicious attacks than a conventional infrastructured wireless network. MANET employs routing to provide connectivity for mobile nodes that are not within direct wireless transmission range. Existing routing protocols in MANET assume a trusted and cooperative environment. However, in hostile environment, mobile nodes are susceptible to various kinds of routing attacks. In this paper, we show that an OLSR MANET node is prone to be isolated by malicious attack called Node Isolation attack. After analysing the attack in detail, we present a technique to mitigate the impact of the attack and improve the performance of the network when the attack is launched. The results of our implementations illustrate that the proposed solution can mitigate the attack efficiently. Copyright © 2007 John Wiley & Sons, Ltd.
Boron Complexes with Chelating Anilido‐Imine Ligands: Synthesis, Structures and Luminescent Properties
Authors: Ren Yi , Liu Xiaoming , Gao Wei , Xia Hong , Ye Ling , Mu Ying 
Published: March 2007

AbstractThree new boron complexes with anilido‐imine ligands, ortho‐C6H4(NAr1)(CH=NAr2)BF2 [Ar1 = 2,6‐Et2C6H3, Ar2 = p‐MeC6H4 (3a); Ar1 = 2,6‐iPr2C6H3, Ar2 = p‐MeC6H4 (3b); Ar1 = 2,6‐iPr2C6H3, Ar2 = 2,6‐Me2C6H3 (3c)] were synthesized by the reaction of BF3(OEt2) with the lithium salt of the corresponding ligands. All complexes were characterized by 1H, 11B, 13C and 19F NMR spectroscopy, elemental analyses and mass spectrometry. The molecular structures of complexes 3a–3c were determined by X‐ray crystallography. DSC analysis of 3a–3c demonstrates their good thermal stability. Luminescent properties of the ligands and the complexes 3a–3c in solution and the solid state were studied. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Synthesis, Characterization, and DFT Investigation of IrIII Tolylterpyridine Complexes
Authors: Yoshikawa Naokazu , Yamabe Shinichi , Kanehisa Nobuko , Kai Yasushi , Takashima Hiroshi , Tsukahara Keiichi 
Published: March 2007

AbstractThree new polypyridine iridium(III) complexes [IrIIICl(L)(tterpy)](PF6)2 {L = phen (1), dpphen (2), and dmbpy (3)} were prepared. Reference complexes [IrIIICl(bpy)(tterpy)](PF6)2 (4) and [IrIII(L)2](PF6)3 {L = tterpy (5) and terpy (6)} were also prepared. Abbreviations of the ligands used here are phen = 1,10‐phenanthroline, dpphen = 4,7‐diphenyl‐1,10‐phenanthroline, bpy = 2,2′‐bipyridine, dmbpy = 4,4′‐dimethyl‐2,2′‐bipyridine, tterpy = 4′‐(4‐tolyl)‐2,2′:6′,2″‐terpyridine, and terpy = 2,2′:6′,2″‐terpyridine. The syntheses, which were accomplished in typical reaction times of fifteen minutes by using a microwave oven, were easier than a previous method. The complexes were characterized by electrospray mass spectrometry, UV/Vis spectroscopy, and cyclic voltammetry (CV). The X‐ray structures of the two complexes 5 and 6 were also obtained. Cyclic voltammograms of all the[IrIIICl(L)(tterpy)]2+ complexes showed that the first reduction occurred at around –0.67 V, which is attributed to the reduction of the tterpy ligand in [IrIIICl(L)(tterpy)]2+. The electronic properties of complexes 5 and 6 were studied by using B3LYP functional calculations, and their optimized geometries were compared to those of the experimentally observed ones. Excited triplet and singlet states are also examined by using time‐dependent density functional theory (TDDFT). The calculated energies of the lowest singlet and triplet states in the two complexes are in good agreement with the experimental absorption and phosphorescence spectra. In this study, it was found that [IrIIICl(L)(tterpy)]2+ emits an intense phosphorescence at room temperature. Since the lowest unoccupied molecular orbitals (LUMOs) of all [IrIIICl(L)(tterpy)]2+ complexes are composed of the π*‐system contribution of the tterpy ligand, the spectroscopic and electrochemical results are discussed comparatively. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
An Improved Ring‐Closing Metathesis Approach to Fluorinated and Trifluoromethylated Nitrogen Heterocycles
Authors: De Matteis Valeria , Dufay Olivier , Waalboer Dennis C. J. , van Delft Floris L. , Tiebes Jörg , Rutjes Floris P. J. T. 
Published: March 2007

AbstractThe synthesis of fluoro‐ and trifluoromethyl‐containing N‐sulfonylated nitrogen heterocycles is described. A first crucial step is a Mitsunobu functionalization of intermediate sulfonamides using commercially available unsaturated alcohols, which gives efficient access to fluorinated ring‐closing metathesis (RCM) precursors. Key step is an RCM reaction of these precursors leading to the corresponding fluoro‐ and trifluoromethyl‐containing heterocyclic building blocks. Furthermore, aminopalladation of the same sulfonamide intermediates provides access to trifuoromethyl‐containing pyrrole derivatives.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Aziridinyl Vinyl Ketones from the Asymmetric Catalytic Aziridination Reaction
Authors: Deng Yonghong , Lee Young Rok , Newman Cory A. , Wulff William D. 
Published: March 2007

AbstractUnder the aegis of boron Lewis acids, prepared from either the vanol or vapol ligand, vinyl aziridinyl ketones can be obtained with a high degree of asymmetric induction from the catalytic asymmetric aziridination reaction (AZ) of imines and vinyl diazomethyl ketones. The products have potential as synthons for five‐carbon chiral amines. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Carbon Nanotubes Paste Electrodes. A New Alternative for the Development of Electrochemical Sensors
Authors: Rivas G. A. , Rubianes M. D. , Pedano M. L. , Ferreyra N. F. , Luque G. L. , Rodríguez M. C. , Miscoria S. A. 
Published: March 2007

AbstractIn this work we summarize the recent activities of our group regarding the analytical performance of a new composite material, the so‐called carbon nanotubes paste electrode (CNTPE) obtained by dispersion of multiwall carbon nanotubes in mineral oil. The electrocatalytic properties towards different redox systems, especially those involved in important enzymatic reactions are discussed. Significant shifting in the overpotentials for the oxidation and/or reduction of hydrogen peroxide, NADH, phenol, catechol, dopamine, ascorbic acid, uric acid and hydroquinone are obtained at CNTPE in comparison with the analogous graphite paste electrode (CPE). The usefulness of the electrode as a matrix for immobilizing enzymes is also demonstrated. Highly sensitive and selective glucose quantification is accomplished even without using permselective films or redox mediators. Enzymatic biosensors obtained by incorporation of lactate oxidase, polyphenol oxidase and alcohol dehydrogenase/NAD+ within the composite material have allowed the successful quantification of lactate, phenol, dopamine, catechin and ethanol. The sensitive quantification of traces of oligonucleotides and double stranded calf thymus DNA by adsorptive stripping is reported. The confined DNA layer demonstrated to be stable either in air, acetate or phosphate buffer. The advantages of incorporating copper particles for the quantification of amino acids and albumin is also discussed.