bluuebunny/crossref_metadata_2025_split huggingface dataset:
3‐Nitrochromene Derivatives as 2π Components in 1,3‐Dipolar Cycloadditions of Azomethine Ylides.
Authors: Viranyi Andrea , Marth Gabriella , Dancso Andras , Blasko Gabor , Toeke Laszlo , Nyerges Miklos 
Published: December 2006

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 Green and Straightforward Synthesis of 4′‐Substituted Terpyridines.
Authors: Winter Andreas , van den Berg Antje M. J. , Hoogenboom Richard , Kickelbick Guido , Schubert Ulrich S. 
Published: December 2006

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 Multi‐Component Reaction for the Synthesis of N‐Substituted Furo[3,4‐b]quinoline Derivatives under Microwave Irradiation.
Authors: Tu Shujiang , Zhang Yan , Jia Runhong , Jiang Bo , Zhang Junyong , Ji Shunjun 
Published: December 2006

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 Novel 2‐Amino‐6,8‐dithioxopurine Derivatives.
Authors: Ikaunieks Martins , Belyakov Sergey , Madre Marina 
Published: December 2006

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.
Original Synthesis of α‐Chloroketones in Azaheterocyclic Series Using TDAE Approach.
Authors: Montana Marc , Terme Thierry , Vanelle Patrice 
Published: December 2006

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.
Strategies for Expanding Structural Diversity Available from Olefin Isomerization—Claisen Rearrangement Reactions.
Authors: Stevens Benjamin D. , Bungard Christopher J. , Nelson Scott G. 
Published: December 2006

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.
Gold‐Catalyzed Intramolecular Allylation of Silyl Alkynes Induced by Silane Alcoholysis.
Authors: Park Sangho , Lee Daesung 
Published: December 2006

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.
Palladium(0)‐Catalyzed Highly Regio‐ and Stereoselective Addition of Organoboronic Acids with 1,2‐Allenylphosphonates Forming Tri‐ or Tetrasubstituted 1(E)‐Alkenylphosphonates.
Authors: Ma Shengming , Guo Hao , Yu Fei 
Published: December 2006

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.
Pteratides I—IV, New Cytotoxic Cyclodepsipeptides from the Malaysian Basidiomycete Pterula sp.
Authors: Chen Chien‐Hui , Lang Gerhard , Mitova Maya I. , Murphy Annabel C. , Cole Anthony L. J. , Din Laily B. , Blunt John W. , Munro Murray H. G. 
Published: December 2006

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.
Chemical Constituents of Tupistra chinensis Rhizomes.
Authors: Pan Wen‐Bin , Wei Li‐Mei , Wei Li‐Lan , Wu Yang‐Chang 
Published: December 2006

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.
Isolation and Biomimetic Synthesis of Antiinflammatory Stilbenolignans from Gnetum cleistostachyum.
Authors: Yao Chun‐Suo , Lin Mao , Wang Lin 
Published: December 2006

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 Synthetic Potential of SET Photochemistry of Silicon‐Substituted Polydonor‐Linked Phthalimides
Authors: Yoon Ung Chan , Mariano Patrick S. 
Published: December 2006

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.
“Click Peptides” — Chemical Biology‐Oriented Synthesis of Alzheimer′s Disease‐Related Amyloid β Peptide (Aβ) Analogues Based on the “O‐Acyl Isopeptide Method”
Authors: Sohma Youhei , Kiso Yoshiaki 
Published: December 2006

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.
Five‐Membered Heterocycles with Vicinal Te and O Heteroatoms
Authors: Sadekov Igor D. , Abakarov Gasan M. , Minkin Vladimir I. 
Published: December 2006

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 Literature of Heterocyclic Chemistry. Part 9. 2002—2004
Authors: Belen'kii L. I. , Gramenitskaya V. N. , Evdokimenkova Yu. B. 
Published: December 2006

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.
Sequence and Structural Deteminants of Amyloid Fibril Formation
Authors: Bemporad Francesco , Calloni Giulia , Campioni Silvia , Plakoutsi Georgia , Taddei Niccolo , Chiti Fabrizio 
Published: December 2006

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.
Theoretical Study on the Structures and Properties of Hydrogen Bonding Complexes between Diazines and Water
Authors: Li Quan , Huang Fang‐Qian , Hu Jing‐Dan , Zhao Ke‐Qing 
Published: December 2006

AbstractDensity functional theory B3LYP method and second‐order Moller‐Plesset perturbation theory MP2 method were employed to obtain the optimized geometries of the ground state and interaction energy for diazines and water complexes. The results show that the ground state complexes have strong hydrogen bonding interaction with −20.99, −16.73 and −15.31 kJ/mol after basis set superposition error and zero‐point vibration energy correction for pyridazine‐water, pyrimidine‐water and pyrazine‐water, respectively, and large red‐shift for the symmetric H–O stretching vibration frequencies due to the formation of N···H–O hydrogen bond in the diazine‐water complexes. The NBO analysis indicates that intermolecular charge transfer are 0.0316, 0.0255 and 0.0265 e respectively. In addition, the first singlet (n,π*) vertical excitation energy of the monomer and the hydrogen bonding complexes between diazines and water was investigated by time‐dependent density functional theory.
Halogen Bonding: An AIM Analysis of the Weak Interactions
Authors: Zou Jian‐Wei , Lu Yun‐Xiang , Yu Qing‐Sen , Zhang Hua‐Xin , Jiang Yong‐Jun 
Published: December 2006

AbstractA series of complexes formed between halogen‐containing molecules and ammonia have been investigated by means of the atoms in molecules (AIM) approach to gain a deeper insight into halogen bonding. The existence of the halogen bond critical points (XBCP) and the values of the electron density (ρb) and Laplacian of electron density (Δ2ρb) at the XBCP reveal the closed‐shell interactions in these complexes. Integrated atomic properties such as charge, energy, polarization moment, volume of the halogen bond donor atoms, and the corresponding changes (Δ) upon complexation have been calculated. The present calculations have demonstrated that the halogen bond represents different AIM properties as compared to the well‐documented hydrogen bond. Both the electron density and the Laplacian of electron density at the XBCP have been shown to correlate well with the interaction energy, which indicates that the topological parameters at the XBCP can be treated as a good measure of the halogen bond strength. In addition, an excellent linear relationship between the interatomic distance d(X···N) and the logarithm of ρb has been established.
Non‐Isothermal Decomposion Kinetics of Supermolecule Compound [Eu(C10H9N2O4)(C10H8N2O4)(H2O)3]2·phen·4H2O
Authors: Yang Rui , He Shui‐Yang , Wu Wang‐Ting , Chen Feng‐Ying , Zhu Rong‐Zu 
Published: December 2006

AbstractEuropium(III) compound with 2‐oxopropionic acid salicyloyl hydrazone (C10H10N2O4, H3L) and 1,10‐phenanthroline (C12H8N2, phen) has been prepared. A yellow prismatic crystal of the compound was obtained, and the molecule crystallized in the triclinic space group P‐1. There are two 9‐coordinated complex molecules in every structure unit, where every Eu atom is coordinated by three water molecules and two tridentate C10H10N2O4 ligands, forming two stable pentacycles. The coordination polyhedron around Eu3+ was described as a single cap square antiprism. In the crystal cell, there are one free 1,10‐phenanthroline and four water molecules. The thermal decomposition of the compound and its kinetics were studied by non‐isothermal thermogravimetry. The Kissinger′s method and Ozawa′s method were used to calculate the activation energy value of the first‐step decomposition. The stages of the decompositions were identified by TG‐DTG‐DSC curve. The non‐isothermal kinetic data were analyzed by means of integral and differential methods. The possible reaction mechanism and the kinetic equations were investigated by comparing the kinetic parameters.
An Expedient Method for the Synthesis of Thiosemicarbazones under Microwave Irradiation in Solvent‐free Medium
Authors: Li Jian‐Ping , Zheng Peng‐Zhi , Zhu Jun‐Ge , Liu Rui‐Jie , Qu Gui‐Rong 
Published: December 2006

AbstractA simple, efficient and eco‐friendly method for the synthesis of thiosemicarbazones from thiosemicarbazides and aldehyde under microwave irradiation has been reported, and no solvent and catalyst were used. And the technique of microwave irradiation coupled with solvent‐free condition proved to be a quite valuable method in the organic synthesis.
A Study on the Interaction of the DAS‐K with Bovine Serum Albumin by On‐line Ultrafiltration and Chemiluminescence
Authors: Zhang Yan‐Tu , Zhang Zhu‐Jun , Sun Yong‐Hua 
Published: December 2006

AbstractPotassium dehydroandrographolide succinate (DAS‐K) has antibacterial and antiviral effects. It has been used widely for the treatment of virus pneumonia, malaria and respiratory infections. In this work, a novel flow‐injection chemiluminescence (CL) method for the determination of DAS‐K was proposed. The method is based on the reaction between DAS‐K and hexacyanoferrate(III) in alkaline solution to give weak CL signal, which is enhanced by rhodamine B. The experimental conditions for the CL reaction were optimized and the possible reaction mechanism was discussed. Under the optimum conditions, the concentration of DAS‐K is proportional to the CL intensity in the range of 0.1–80 μmol·L−1 with a detection limit of 0.05 μmol·L−1. The interaction of the DAS‐K with bovine serum albumin by on‐line ultrafiltration and flow‐injection chemiluminescence was studied. The concentrations of unbound DAS‐K from ultra filter tube were determined by the flow‐injection CL method. The binding parameters were estimated by the Scatchard plot and Klotz plot. The proposed system proved that FIA‐CL coupled with on‐line ultrafiltration sampling was a fast and simple technique for the study of drug‐protein interaction.
An Efficient Synthesis of Selective Human NR2A Antagonist NVP‐AAM077
Authors: Li Gang‐Qin , Su Wei‐Ke , Yao Zhu‐Jun 
Published: December 2006

AbstractA short and efficient synthesis of the selective humanN‐methyl‐D‐aspartate (NMDA) receptor 2A (NR2A) antagonist NVP‐AAM077 is described. The target was achieved in 8 steps and in 54% overall yield from the commercially available chemical 3‐methylbenzene‐1,2‐diamine. A NaIO4/DMF‐based oxidation of the bromide to corresponding aldehyde and an addition of phosphinic acid ester to the aldimine successfully served as the key steps.
The cis‐trans Isomerisation of Homologous 2‐Hydroxycycloalkanecarboxylic Acids under Basic Conditions
Authors: Gyarmati Cs. Zsuzsanna , Pálinkó István , Bokros Attila , Martinek A. Tamása , Bernáth Gábor 
Published: December 2006

AbstractThe cis→trans isomerisation of homologous 2‐hydroxycycloalkanecarboxylic acids in strongly basic aqueous solution was studied starting from the cis isomers. It was found that the cyclopentane, cyclohexane and cycloheptane homologues afforded synthetically useful amounts of the trans acids and the procedure resulted in relatively small quantities of the corresponding olefinic acids. In contrast, the isomerisation of the cis‐2‐hydroxycyclooctanecarboxylic acid produced roughly equal amounts of the cis and trans isomers and the 1‐cyclooctenecarboxylic acid at equilibrium. Molecular modelling with the PM3 semiempirical method of the reactants, products and the intermediates applying explicit water molecules as reaction medium gave a fair estimate for the rate sequence of the idealised (dehydration‐free) isomerisation reactions in aqueous base solution.
Preparation, Characterization and Magnetic Properties of PANI/La‐substituted LiNi Ferrite Nanocomposites
Authors: Jiang Jing , Li Liang‐Chao , Xu Feng 
Published: December 2006

AbstractMagnetic nanocomposites containing polyaniline (PANI)‐coated La‐substituted LiNi ferrite (LiNi0.5La0.02Fe1.98O4) were synthesized by in situ polymerization in aqueous solution of hydrochloric acid. The nanocomposites exhibited the magnetic hysteresis nature under applied magnetic field. The saturation magnetization (MS) and coercivity (HC) varied with the ferrite content. The obtained nanocomposites were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT‐IR), UV‐Visible spectroscopy and vibrating sample magnetometer (VSM). TEM and SEM studies showed that the nanocomposites present the core‐shell structure. The results of XRD patterns, FT‐IR and UV‐Visible spectra indicated the formation of PANI‐LiNi0.5La0.02Fe1.98O4 nanocomposites and showed that the interaction existed between PANI backbone and ferrite particles in the nanocomposites. The bonding mechanism in the nanocomposites has been proposed.
The rationale, design, and implementation of the American Cancer Society's studies of cancer survivors
Authors: Smith Tenbroeck , Stein Kevin D. , Mehta C. Christina , Kaw Chiewkwei , Kepner James L. , Buskirk Trent , Stafford Jeremy , Baker Frank 
Published: December 2006

AbstractThe American Cancer Society (ACS) defines cancer survivorship as beginning at diagnosis with cancer and continuing for the balance of life and views quality of life (QOL) as a key outcome. In this article, the authors describe the rationale, methodology, and sample characteristics of the 2 ACS Studies of Cancer Survivors (SCS): 1) a longitudinal study identifying and surveying survivors approximately 1 year postdiagnosis that includes plans to resurvey the panel at 2 years, 7 years, and 12 years postdiagnosis to identify predictors of QOL; and 2) a cross‐sectional study of QOL among 3 separate cohorts of survivors who were approximately 3 years, 6 years, and 11 years postdiagnosis at the time of data collection. Survivors of prostate, breast, lung, colorectal, bladder, skin, kidney, ovarian, and uterine cancers and of non‐Hodgkin lymphoma were sampled from 25 different central cancer registries, with African‐American and Hispanic survivors over sampled. Survivors completed either mail or telephone surveys that described their physical, psychological, social, and spiritual functioning. The overall recruitment rate was 34.0%; 15411 participants completed surveys, of whom 40.1% had a high school education or less and 19.4% were racial/ethnic minorities. The SCS surveys provide a large diagnostically, geographically, and demographically diverse database on cancer survivorship that was designed to overcome some of the limitations of past research. Future reports will compare QOL of survivors at different well‐defined times postdiagnosis, investigate the issues of understudied populations and diagnostic groups, and describe survivor QOL at state levels. Insights valuable to those considering registry‐based studies are offered on issues of ascertainment, sampling, and recruitment. Cancer 2007. © 2006 American Cancer Society.
Discontinuous Galerkin finite element approximation of the two‐dimensional Navier–Stokes equations in stream‐function formulation
Authors: Mozolevski Igor , Süli Endre , Bösing Paulo Rafael 
Published: December 2006

AbstractIn this paper, we present the construction and computational assessment of an hp‐version discontinuous Galerkin finite element method (DGFEM) for the numerical solution of the Navier–Stokes equations governing 2D stationary incompressible flows. Using a stream‐function formulation, which ensures that the incompressibility constraint is automatically satisfied, we reduce the system of Navier–Stokes equations to a single fourth‐order nonlinear partial differential equation. We introduce a discretization of this fourth‐order nonlinear partial differential equation based on a combination of the symmetric DGFEM for the biharmonic part of the equation and a DGFEM with jump‐penalty terms for the hyperbolic part of the problem, and then we solve the resulting nonlinear problem using Newton's method. Numerical examples, including the solution of the 2D lid‐driven cavity flow problem, are presented to demonstrate the convergence and accuracy of the method. Copyright © 2006 John Wiley & Sons, Ltd.
Towards a Detailed Understanding of Bacterial Metabolism—Spectroscopic Characterization of Staphylococcus Epidermidis
Authors: Neugebauer Ute , Schmid Ulrike , Baumann Knut , Ziebuhr Wilma , Kozitskaya Svetlana , Deckert Volker , Schmitt Michael , Popp Jürgen 
Published: December 2006

AbstractBacteria are a major cause of infection. To fight disease and growing resistance, research interest is focused on understanding bacterial metabolism. For a detailed evaluation of the involved mechanisms, a precise knowledge of the molecular composition of the bacteria is required. In this article, various vibrational spectroscopic techniques are applied to comprehensively characterize, on a molecular level, bacteria of the strain Staphylococcus epidermidis, an opportunistic pathogen which has evolved to become a major cause of nosocomial infections. IR absorption spectroscopy reflects the overall chemical composition of the cells, with major focus on the protein vibrations. Smaller sample volumes—down to a single cell—are sufficient to probe the overall chemical composition by means of micro‐Raman spectroscopy. The nucleic‐acid and aromatic amino‐acid moieties are almost exclusively explored by UV resonance Raman spectroscopy. In combination with statistical evaluation methods [hierarchical cluster analysis (HCA), principal component analysis (PCA), linear discriminant analysis (LDA)], the protein and nucleic‐acid components that change during the different bacterial growth phases can be identified from the in vivo vibrational spectra. Furthermore, tip‐enhanced Raman spectroscopy (TERS) provides insight into the surface structures and follows the dynamics of the polysaccharide and peptide components on the bacterial cells with a spatial resolution below the diffraction limit. This might open new ways for the elucidation of host–bacteria and drug–bacteria interactions.
Niobium Oxide Mesophases Obtained by Self‐Assembly of an Aqueous Soluble Niobium Complex Precursor and Organic Templates
Authors: Bizeto Marcos A. , Constantino Vera R. L. 
Published: December 2006

AbstractIn this paper the use of triammonium trioxalato(oxido)niobate {(NH4)3[NbO(C2O4)3]} as an inorganic precursor to assemble organized hybrid niobium oxide mesophases using n‐octylamine (OCT) and cetyltrimethylammonium (CTA) bromide as structure‐directing agents is described for the first time. The niobium complex is water‐soluble and its hydrolysis at controlled pH and in the presence of organic templates leads to the formation of hybrid mesophases. A lamellar mesophase is produced by a neutral route based on the interaction of hydrolyzed units with the octylamine micelles. On the other hand, a hexagonal (p6m) mesophase is obtained when hydrolyzed species interact with CTA micelles through a charge‐matching route (ionic route). This is the first time that such an ionic route has been described for the production of organized niobium oxide hybrids.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
The Interplay between Yttrium and Barium or Copper Trifluoroacetates and N‐Methyldiethanolamine: Synthesis of a Heterometallic Y3Cu Trifluoroacetate Complex and a Homometallic Ba‐TFA 1D Polymer
Authors: Mishra Shashank , Zhang Jianyong , Hubert‐Pfalzgraf Liliane G. , Luneau Dominique , Jeanneau Erwann 
Published: December 2006

AbstractThe reactions between [Y(TFA)3(H2O)3] and either [Cu(TFA)2(MeOH)] or [Ba(TFA)2]∞ in the presence of excess N‐methyldiethanolamine (mdeaH2) have been investigated in relation with their use as precursors for high Tc superconductors. They afford the heterometallic Y3Cu complex [CuY3(μ3‐OH)(μ‐η3:η1‐mdeaH)3(μ3‐η3:η1:η1‐mdeaH)2(η2‐TFA)(μ,η2‐TFA)2](TFA)2(H2O) (1) and the homometallic Ba‐TFA 1D polymer [Ba3(η3‐mdeaH2)2(μ‐η3:η1‐mdeaH2)2(η1‐TFA)2(η2‐TFA)2(μ3‐η2:η2:η1‐TFA)2]1∞ (2), respectively, in high yield. These compounds were characterised by X‐ray diffraction and FT‐IR, ESR (for 1) and NMR (for 2) spectroscopy. Single‐crystal X‐ray diffraction studies show the versatile bonding modes of the trifluoroacetate and N‐methyldiethanolamine ligands, with the former acting not only as a terminal (η1 and η2) or bridging‐chelating (μ,η2 and μ3‐η2:η2:η1) ligand but also as a counterion, whereas the latter, either protonated or partially deprotonated, binds the metal centres in a chelating (η3) or bridging‐chelating (μ,η3:η1 and μ3‐η3:η1:η1) manner. The triangular Y3 unit [3.480(6)–3.550(6) Å] in the cation of 1 consists of one nine‐coordinate and two eight‐coordinate Y atoms, the former of which are quite scarce in alkoxide chemistry. The unique feature of the 1D polymeric structure of 2 is the secondary F···cation bond, which has not been observed so far for TFA ligands. In addition, it is the only example where the Ba atom is linked to monodentate, bidentate and bridging trifluoroacetate ligands simultaneously. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
Cover Picture: Imidazo[1,5‐a]pyridinium Salts from Phenylchlorocarbene and 2‐Pyridyl Schiff Bases: Synthesis, Reaction Mechanism and Effect of Rotamerism (Eur. J. Org. Chem. 24/2006)
Authors: Bonneau Roland , Guionneau Philippe 
Published: December 2006

AbstractThe cover picture shows the mechanistic scheme of the synthesis of imidazo[1,5‐a]pyridinium salts from phenylchlorodiazirine and 2‐pyridyl Schiff bases. The carbene produced by thermolysis of the diazirine reacts with the pyridyl Schiff base to give two different ylide species, which are detected by laser flash photolysis. However, a single product is formed in a nearly quantitative yield and is easily separated from the reactants since it precipitates in nonpolar solvents. Colour code: blue = N, red = Cl, yellow = alkyl or aryl substituent, green = phenyl group. Details are discussed in the article by R. Bonneau and P. Guionneau on p. 5459 ff.