bluuebunny/crossref_metadata_2025 huggingface dataset:
«Bref, c'est mon disciple», le cas Flaubert-Maupassant
Authors: Forestier Louis
Published: November 2007

Not many artists must have experienced such a self-evident, close, fully granted master to disciple relationship as Flaubert and Maupassant have. It was a passionate relationship which led both characters to acceptance, tensions, attraction and hatred. It is not easy to define clearly as it is based on conversations and on the memory of Alfred Le Poittevin, whose part cannot be defined precisely. On the contrary, it has been made quite clear that Laure de Maupassant, in 1867, wittingly initiated a friendship between her son and Flaubert. This relationship slowly asserted itself and was fully accepted by both as master to disciple in 1876 only. Flaubert did not make a show of his status, being modest, hiding his feelings; a detailed study of the correspondence proves how he hid himself and how he asserted himself though. This allegiance-protection relationship can be explained by common preferences, opinions or attitudes (teaching, help when needed) which made Flaubert become an entrancing presence for Maupassant. It was so until the exhilarating moment of publication of Boule de Suif occurred and that the master recognised his disciple as an equal. This recent relationship was soon broken by the death of Flaubert. Maupassant remained at the same time disciple and master, battling with an unexpected though acknowledged by all, succession. He faced a nearly filial inheritance he had to inherit and make flourish, with all the risks it could represent — starting with repetition — against which he protected himself by showing a latent antiflaubertism.
Chateaubriand en Égypte : le voyageur désenchanté
Authors: Antoine Philippe
Published: November 2007

As Chateaubriand was not very receptive to oriental magic he visited Egypt rapidly. Indeed, the pyramid, a tomb in the desert, may shape a personal myth but dream is always impeded by reality: the author of the Itinéraire cannot succeed in reviving a prestigious past because he is shocked by the distressing image of an enslaved country. Under the novelist's pen Christian Egypt outshines the Pharaohs ' ; as for the politician, he reactivates the thesis of oriental despotism by putting it at the service of the fight of Christianity against barbarism. Since culture is inefficient and experience is deceptive, there is no other solution to re-enchant the world but to take refuge in the land of the ego.
Crystal Phase Control of Luminescing α‐NaGdF4:Eu3+and β‐NaGdF4:Eu3+ Nanocrystals
Authors: Ptacek P. , Schäfer H. , Kömpe K. , Haase M.
Published: November 2007

NaGdF4:Eu3+, NaEuF4, and NaGdF4 nanocrystals were synthesized in the high‐boiling coordinating solvent N‐(2‐hydroxyethyl)‐ethylenediamine (HEEDA). Phase pure nanomaterials, crystallizing either in the cubic α‐phase or the hexagonal β‐phase, were obtained by adjusting one reaction parameter only, i.e., the molar ratio between metal and fluoride ions in the synthesis. The hexagonal β‐phase is formed, if this molar ratio is close to stoichiometric, whereas the cubic α‐phase is obtained in the presence of excess metal ions. The optical properties of the Eu3+ doped samples are different for the two crystal phases. The results indicate an increased number of oxygen impurities close to Eu3+ ions, if excess metal ions are used in the synthesis.
The Imprint of Electropolymerized Polyphenol Films on Electrodes by Donor‐Acceptor Interactions: Selective Electrochemical Sensing of N,N′‐dimethyl‐4,4′‐bipyridinium (Methyl Viologen)
Authors: Riskin M. , Tel‐Vered R. , Willner I.
Published: November 2007

Polyphenol is electropolymerized on a Au electrode in the presence of N,N′‐dimethyl‐4,4′‐bipyridinium, methyl viologen, MV2+, to yield an imprinted film for MV2+. The association and dissociation of MV2+ to and from the imprinted sites is studied by electrochemical means and compared to the interactions of MV2+ with the non‐imprinted polymer. Donor‐acceptor interactions provide the driving force for the formation of the imprinted sites. The imprinted polymer reveals selectivity toward the association of MV2+, and the polymer‐bound MV2+ enables vectorial electron transfer between the electrode and redox label dissolved in the bulk electrolyte solution.
Nanosensor Design Packages: A Smart and Compact Development for Metal Ions Sensing Responses
Authors: El‐Safty S. A. , Prabhakaran D. , Ismail A. A. , Matsunaga H. , Mizukami F.
Published: November 2007

With recent advances in mesostructured materials and nanotechnologies, new methods are emerging to design optical sensors and biosensors, and to develop highly sensitive solid sensors. Here, highly sensitive, low cost, simple nanosensor designs for naked‐eye detection of toxic metal ions are successfully developed by the immobilization of commercially available α,β,γ,δ‐tetrakis(1‐methylpyridinium‐4‐yl)porphine p‐toluenesulfonate (TMPyP) and diphenylcarbazide (DPC), and chemically synthesized 4‐n‐dodecyl‐6‐(2‐thiazolylazo) resorcinol (DTAR) and 4‐n‐dodecyl‐6‐(2‐pyridylazo) phenol (DPAP) chromophore molecules into spherical nanosized cavities and surfaces. A rational strategy was crucial to develop optical nanosensors that can be used to control accurate recognition and signaling abilities of analyte species for ion‐sensing purposes. This is the first reported evidence of the significant key factors of the development of receptors as ‘indicator dyes' and surface‐confinement materials as ‘carriers' to broadening the applicability of optical chemical sensors for selective discrimination of trace levels of toxic analytes. In all the nanosensor design techniques presented here, a dense pattern of immobilized hydrophobic ‘neutral' and hydrophilic ‘charged' chromophores with intrinsic mobility, as a result of extremely robust constructed sequences on nanoscale structures, is a key to enhancing the sensing functionality of optical nanosensors. These nanosensor designs can be used as cage probe sinks with reliable control, for the first time, over the colorimetric recognition of cadmium ions to low levels of concentration in the range of 10–9 to 10–10 M. Optimization of control sensing conditions is established to achieve enhanced signal response and color intensities. These chemical nanosensors are reversible and have the potential to serve effectively in on‐site field analysis of environmental samples, which eliminates the necessity for instrument‐dependent analysis. Moreover, these new classes of optical cage sensors exhibit long‐term stability of signaling and recognition functionalities that in general provide extraordinary sensitivity, selectivity, reusability, and fast kinetic detection and quantification of various deleterious metal ions in our environment.
Electrodeposited Zinc Oxide/Phthalocyanine Films – An Inorganic/Organic Hybrid System with Highly Variable Composition
Authors: Boeckler C. , Feldhoff A. , Oekermann T.
Published: November 2007

Hybrid films of zinc oxide (ZnO) and tetrasulfonated nickel phthalocyanine (TSPcNi) have been electrodeposited by cathodic electrodeposition from aqueous O2‐saturated solutions of ZnCl2 and TSPcNi. The TSPcNi content of the films can be varied in a wide range by variation of dye concentration in the electrodeposition bath – from single TSPcNi molecules embedded in compact crystalline ZnO to films based on an amorphous TSPcNi framework. With increasing dye content the colour of the films changes from green, indicating the presence of the TSPcNi monomers, to blue, caused by TSPcNi aggregates. At the same time, changes in the electrical and photoelectrical properties of the films are observed, enabling the tuning of these properties in view of optoelectronic applications.
Amino Alcohols in Organocatalysed Acylation and Deacylation: The Effect of Dialkylamino Substituents on the Rate
Authors: Wessjohann Ludger A. , Zhu Mingzhao
Published: November 2007

In alcohols and esters, a neighbouring dialkylamino group can enhance the reactivity towards acylation and deacylation, respectively, that is, such amino alcohols can act as transacylation catalysts like DMAP. This effect is dependent on the number of (carbon) spacer atoms, flexibility of the molecule and the presence and position of further heteroatoms. Based on this effect, the site selective acylation and deacylation of desmycosin, a macrocycle antibiotic possessing an amino sugar moiety, is described.
Highly Efficient Alkyne Hydroarylation with Chelating Dicarbene Palladium(II) and Platinum(II) Complexes
Authors: Biffis Andrea , Tubaro Cristina , Buscemi Gabriella , Basato Marino
Published: November 2007

1 We report on a novel reaction protocol for the coupling of arenes with alkynes (the Fujiwara reaction), yielding products of formal trans‐hydroarylation of the triple bond. The protocol makes use of a chelating N‐heterocyclic dicarbene palladium(II) complex as catalyst and allows us to perform the reaction in a few hours with only 0.1 mol % catalyst yielding the trans‐hydroarylation product in high yields and with excellent selectivity. We discuss the applicability of this reaction protocol, which appears at present quite general with respect to the alkyne, albeit limited to electron‐rich arenes. We also present the results of catalyst optimisation with respect to the nature of the nitrogen substituents in the carbene units, of the bridging group between the carbene units and of the coordinated anionic ligands. Finally, we also discuss the catalytic performance of a related chelating dicarbene complex of platinum(II).
A Ring‐Closing Metathesis Approach to Cyclic α,β‐Dehydroamino Acids
Authors: Hekking Koen F. W. , Waalboer Dennis C. J. , Moelands Marcel A. H. , van Delft Floris L. , Rutjes Floris P. J. T.
Published: November 2007

A comprehensive study on the synthesis and ring‐closing metathesis (RCM) of α,β‐dehydroamino acids is described. This sequence has led to the formation of a range of biologically relevant functionalized nitrogen heterocycles. The incorporation of chiral building blocks in the RCM precursors eventually resulted in the formation of optically active 4‐substituted cyclic dehydroamino acids. In addition, olefin isomerization under metathesis conditions was observed for a number of compounds, which could be successfully inhibited either by the introduction of allylic substituents or by the addition of a ruthenium hydride scavenger.
Electrochemical Bromination of Peracetylated Glycals
Authors: Čolović Marija , Vukićević Mirjana , Šegan Dejan , Manojlović Dragan , Sojic Neso , Somsák László , Vukićević Rastko D.
Published: November 2007

Bromination of glycals with tribromides formed in situ from bromine and different bromide salts in dichloromethane (DCM) or acetonitrile (AN) was found to give predominantly the products of anti addition of bromine from the C‐6 side in high yields. The same selectivity, which was much higher compared to bromination with bromine alone, was achieved in bromination of these substrates by anodic generation of bromine from the same salts.
Copper‐Catalyzed Highly Efficient Multicomponent Reactions of Terminal Alkynes, Acid Chlorides, and Carbodiimides: Synthesis of Functionalized Propiolamidine Derivatives
Authors: Xu Xiaoliang , Gao Jianrong , Cheng Dongping , Li Jinghua , Qiang Genrong , Guo Hongyun
Published: November 2007

Functionalized propiolamidine derivatives were prepared in good to excellent yields under very mild conditions via a copper‐catalyzed multicomponent reaction (MCR) of readily available terminal alkynes, acid chlorides and carbodiimides with the assistance of triethylamine. The mechanism of this MCR is postulated.
Organocatalytic Asymmetric Sulfa‐Michael Addition to α,β‐Unsaturated Ketones
Authors: Ricci Paolo , Carlone Armando , Bartoli Giuseppe , Bosco Marcella , Sambri Letizia , Melchiorre Paolo
Published: November 2007

The highly enantioselective organocatalytic sulfa‐Michael addition to α,β‐unsaturated ketones has been accomplished using benzyl andtert‐butyl mercaptans as the sulfur‐centered nucleophiles. Optically active products are obtained in high yields and good to excellent stereocontrol (up to 96 %ee) from a large variety of enones. Central to these studies has been the use of the catalytic primary amine saltA, derived from 9‐amino‐(9‐deoxy)‐epi‐hydroquinine andD‐N‐Boc‐phenylglycine, in which both the cation and the anion are chiral, that exhibits high reactivity and selectivity for iminium ion catalysis with enones.
Radar‐Magnet‐Betontest: Eine neue Methode zur Bestimmung der Feuchte und des Chloridgehalts von Brückenfahrbahnplatten aus Beton
Authors: Krause Hans‐Joachim , Rath Edmund , Sawade Gottfried , Dumat Frank
Published: November 2007

Zur Zustandsbeurteilung von Brückenfahrbahnplatten ist es wichtig, die Feuchte und den Chloridgehalt des bewehrten Betons zu kennen. In diesem Beitrag wird ein neues Verfahren vorgestellt, das eine zerstörungsfreie Bestimmung der Betonfeuchte und des Salzgehalts durch die Fahrbahndecke hindurch ermöglicht. Mit Georadar wird die Laufzeit der elektromagnetischen Wellen bis zur oberflächennahen Bewehrung bestimmt. Sie hängt von den dielektrischen Eigenschaften der dazwischen befindlichen Materialien ab. Die Tiefenlage der Bewehrungsstähle wird mit einer magnetischen Gleichfeld‐Methode ermittelt. Die magnetisch bestimmte Tiefe ist unabhängig von den dielektrischen Eigenschaften der dazwischen befindlichen Materialien. Durch Vergleich der Radar‐Laufzeit mit der magnetisch gemessenen Tiefe wird die Ausbreitungsgeschwindigkeit und damit der Realteil der effektiven Dielektrizitätskonstante (DK) des überdeckenden Betons bestimmt. Der Imaginärteil der DK wird aus dem gemessenen Reflektionskoeffizienten abgeleitet. Über Kalibrationskurven werden daraus Feuchte und Salzgehalt des Beton bestimmt. Das Verfahren wurde im Labor an Beton‐Probekörpern mit und ohne Asphaltüberdeckung verifiziert. Ein Radar‐Magnet‐Messwagen wurde entwickelt und auf zwei Brückenbauwerken erfolgreich erprobt. Die DK des oberflächennahen Betons der Brückenfahrbahnplatte wurde großflächig kartiert. Das Verfahren eignet sich gut, um schnell und zerstörungsfrei große Flächen auf potenziell geschädigte Bereiche hin zu überprüfen, die ggf. im Anschluss detaillierter untersucht werden sollten.
Korrosionsmonitoring und Bruchortung in Spannbetonbauwerken – Möglichkeiten und Grenzen
Authors: Holst Alexander , Budelmann Harald , Hariri Karim , Wichmann Hans‐Joachim
Published: November 2007

Korrosive Einflüsse können die dauerhafte Funktionsfähigkeit der Spannglieder in Spannbetontragwerken beeinträchtigen und zum katastrophalen Bauteilversagen führen. Die Aufgabe der Zustandserfassung bei vorgespannten Bauteilen ist daher, vorhandene Defekte und Schäden der Spannglieder, wie z. B. Verpressfehler, Korrosion und Spanndrahtbrüche, rechtzeitig und zuverlässig zu detektieren. Für die objektive Früherkennung von Korrosionsschäden an Spanngliedern ist die Bauwerksüberwachung (Monitoring) auf der Grundlage von zerstörungsfreien Prüf‐ und Messtechniken prädestiniert.

In diesem Beitrag werden zunächst die Ursachen der Spanngliedkorrosion im Spannbetonbrückenbau benannt sowie Vorteile und Strategie eines Korrosionsmonitorings dargelegt. Anschließend wird der Stand der Forschung und Technik zur zerstörungsfreien Erfassung des Korrosionszustands und von Brüchen an Brückenspanngliedern mit deren Möglichkeiten und Grenzen diskutiert. In diesem Zusammenhang werden auch einige von den Verfassern im Rahmen des Sonderforschungsbereichs (SFB)477 “Bauwerksüberwachung” am iBMB entwickelte innovative Sensoren und Messverfahren vorgestellt.
Probabilistische Modellierung hochfester Stahlbetonstützen in Hochhäusern
Authors: Schmidt Holger , Six Michael
Published: November 2007

In Deutschland wird hochfester Beton bereits seit Anfang der 1990er Jahre erfolgreich eingesetzt. Insbesondere bei Stahlbetonstützen in Hochhäusern ermöglicht die extrem hohe Druckfestigkeit dieses Baustoffs eine deutliche Querschnittsreduzierung, wodurch architektonisch und funktional anspruchsvolle Anforderungen gleichermaßen erfüllt werden können. Dies führt in vielen Fällen zu sehr schlanken und damit stabilitätsgefährdeten Tragsystemen. Aufgrund der bisher positiven Erfahrungen mit hochfestem Beton werden im Rahmen der vorliegenden Untersuchungen die ursprünglich konservativen Bemessungsansätze kritisch hinterfragt. In diesem Zusammenhang werden die normativen Regelungen in DIN 1055‐3 und DIN 1045‐1 mit den Ergebnissen einer Bemessung auf probabilistischer Basis verglichen und diesbezüglich Optimierungspotentiale aufgezeigt.
Historische Inspektionstätigkeiten im Ingenieurwesen
Authors: Santa Ulrich , Bergmeister Konrad , Strauss Alfred
Published: November 2007

Die Erhaltung und Inspektionen von Bauwerken treten zunehmend aufgrund von Berichterstattungen bezüglich Strukturversagen in das Interesse unserer Gesellschaft. Waren früher das Vertrauen in Technik und ihre Möglichkeiten nahezu unbegrenzt, so sind aktuelle Ereignisse im Naturgefahrenbereich und im Infrastrukturbereich Anlass zur kritischen Beleuchtung der Technikgläubigkeit. Infolge werden verstärkt Aufrufe für eine kontinuierliche Prüfung bzw. Inspektion hörbar. Inspektionen und Erhaltungsstrategien im Ingenieursbereich sind jedoch nicht eine Erscheinung unserer Zeit. Dieser Aufsatz soll einige gegenwärtige und vergangene Entwicklungen der Erhaltungs‐ und Inspektionstätigkeit im Ingenieurswesen aufzeigen.
Catalyst Parameters Determining Activity and Selectivity of Supported Gold Nanoparticles for the Aerobic Oxidation of Alcohols: The Molecular Reaction Mechanism
Authors: Abad Alberto , Corma Avelino , García Hermenegildo
Published: November 2007

As previously reported for for solventless reactions, gold nanoparticles supported on ceria are also excellent general heterogeneous catalysts for the aerobic oxidations of alcohols in organic solvents. Among organic solvents it was found that toluene is a convenient one. A systematic study on the influence of the particle size and gold content on the support has established that the activity correlates linearly with the total number of external gold atoms, and with the surface coverage of the support. Amongst catalysts with different supports, but similar gold particle size and content, gold on ceria exhibits the highest activity. By means of a kinetic study (influence of σ+ parameter, kinetic isotopic effect, temperature, alcohol concentration and oxygen pressure) a mechanistic proposal consisting of the formation of metal–alcoholate, β‐hydride shift from carbon to metal and MH oxidation has been proposed that explains all experimental results.
A Combination of Lacunary Polyoxometalates and High‐Nuclear Transition‐Metal Clusters under Hydrothermal Conditions. Part II: From Double Cluster, Dimer, and Tetramer to Three‐Dimensional Frameworks
Authors: Zhao Jun‐Wei , Jia Hong‐Peng , Zhang Jie , Zheng Shou‐Tian , Yang Guo‐Yu
Published: November 2007

The hydrothermal reactions of trivacant Keggin A‐α‐XW9O34 polyoxoanions (X=PV/SiIV) with transition‐metal ions (NiII/CuII/FeII) in the presence of amines result in eight novel high‐nuclear transition‐metal‐substituted polyoxotungstates [{Ni7(μ3‐OH)3O2(dap)3(H2O)6}(B‐α‐PW9O34)][{Ni6(μ3‐OH)3(dap)3(H2O)6}(B‐α‐PW9O34)][Ni(dap)2(H2O)2]⋅4.5 H2O (1), [Cu(dap)(H2O)3]2[{Cu8(dap)4(H2O)2}(B‐α‐SiW9O34)2]⋅6 H2O (2), (enH2)3H15[{FeII1.5FeIII12(μ3‐OH)12(μ4‐PO4)4}(B‐α‐PW9O34)4]⋅ca.130 H2O (3), [{Cu6(μ3‐OH)3(en)3 (H2O)3}(B‐α‐PW9O34)]⋅7 H2O (4), [{Ni6(μ3‐OH)3(en)3(H2O)6}(B‐α‐PW9O34)]⋅7 H2O (5), [{Ni6(μ3‐OH)3(en)2(H2O)8}(B‐α‐PW9O34)]⋅7 H2O (6), [{Ni6(μ3‐OH)3(dap)2(H2O)8}(B‐α‐PW9O34)]⋅ 7 H2O (7), and [{Ni6(μ3‐OH)3(en)3(H2O)6}(B‐α‐SiW9O34)][Ni0.5(en)]⋅ 3.5 H2O (8) (en=ethylenediamine, dap=1,2‐diaminopropane). These compounds have been structurally characterized by elemental analyses, IR spectra, diffuse reflectance spectra, thermogravimatric analysis, and X‐ray crystallography. The double‐cluster complex of phosphotungstate 1 simultaneously contains hepta‐ and hexa‐NiII‐substituted trivacant Keggin units [{Ni7(μ3‐OH)3O2(dap)3(H2O)6}(B‐α‐PW9O34)]2− and [{Ni6(μ3‐OH)3(dap)3(H2O)6}(B‐α‐PW9O34)]. The dimeric silicotungstate 2 is built up from two trivacant Keggin [B‐α‐SiW9O34]10− fragments linked by an octa‐CuII cluster. The main skeleton of 3 is a tetrameric cluster constructed from four tri‐FeIII‐substituted [FeIII3(μ3‐OH)3(B‐α‐PW9 O34)]3− Keggin units linked by a central FeII4O4 cubane core and four μ4‐PO4 bridges. Complex 4 is an unprecedented three‐dimensional extended architecture with hexagonal channels built by hexa‐CuII clusters and trivacant Keggin [B‐α‐PW9O34]9− fragments. The common feature of 5–8 is that they contain a B‐α‐isomeric trivacant Keggin fragment capped by a hexa‐NiII cluster, very similar to the hexa‐NiII‐substituted trivacant Keggin unit in 1. Magnetic measurements illustrate that 1, 2, and 5 have ferromagnetic couplings within the magnetic metal centers, whereas 3 and 4 reveal the antiferromagnetic exchange interactions within the magnetic metal centers. Moreover, the magnetic behavior of 4 and 5 have been theoretically simulated by the MAGPACK magnetic program package.
Mechanistically Diverse Copper‐, Silver‐, and Gold‐Catalyzed Acyloxy and Phosphatyloxy Migrations: Efficient Synthesis of Heterocycles via Cascade Migration/Cycloisomerization Approach.
Authors: Schwier Todd , Sromek Anna W. , Yap Dahrika M. L. , Chernyak Dmitri , Gevorgyan Vladimir
Published: November 2007

ChemInform 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 Novel, Facile Route to β‐Fluoroamines by Hydrofluorination Using Superacid HF—SbF5.
Authors: Thibaudeau Sebastien , Martin‐Mingot Agnes , Jouannetaud Marie‐Paule , Karam Omar , Zunino Fabien
Published: November 2007

ChemInform 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.
Lewis Base Activation of Lewis Acids: Catalytic, Enantioselective Vinylogous Aldol Addition Reactions.
Authors: Denmark Scott E. , Heemstra John R. Jr.
Published: November 2007

ChemInform 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 Synthesis of Amines by the Homogeneous Hydrogenation of Secondary and Primary Amides.
Authors: Nunez Magro Angel A. , Eastham Graham R. , Cole‐Hamilton David J.
Published: November 2007

ChemInform 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 Cyclopropanes via Organoiron Methodology: Stereoselective Preparation of Bi(cyclopropyl)s.
Authors: Pandey Rajesh K. , Lindeman Sergey , Donaldson William A.
Published: November 2007

ChemInform 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.
Novel Polymer‐Supported Chiral Catalysts for the Asymmetric Addition of Diethylzinc to Aldehydes.
Authors: Wang Su‐Xi , Chen Fen‐Er
Published: November 2007

ChemInform 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 Air‐Stable Chiral Hf‐Based Catalyst for Asymmetric Mannich‐Type Reactions.
Authors: Kobayashi Shu , Yazaki Ryo , Seki Kazutaka , Ueno Masaharu
Published: November 2007

ChemInform 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.
Pinacol Coupling of Aromatic Aldehydes and Ketones Mediated by TiCl4—Zn in Ethyl Acetate under Ultrasound.
Authors: Li Ji‐Tai , Sun Xue‐Li , Lin Zhi‐Ping , Chen Yan‐Xue , Li Tong‐Shuang
Published: November 2007

ChemInform 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.
Stereoselective Cross‐Coupling Reaction of 2,4‐Diaryl‐1,1‐diboryl‐1,3‐butadienes: Stereocontrolled Approach to 1,3,4,6‐Tetraarylated 1,3,5‐Hexatrienes.
Authors: Shimizu Masaki , Shimono Katsuhiro , Schelper Michael , Hiyama Tamejiro
Published: November 2007

ChemInform 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 Bicyclo[4.1.0]heptenes via Palladium‐Catalyzed Intramolecular Coupling—Cyclization of 3‐(Cyclohexa‐2,4‐dienyl)pentane‐2,4‐dione with β‐Styryl Bromides.
Authors: Yeh Ming‐Chang P. , Tsao Wen‐Cheng , Wang Yen‐Jung , Pai Hui‐Fen
Published: November 2007

ChemInform 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.
Stereoselective Synthesis of 1,2,2‐Trisubstituted Indan Derivatives Using a Tandem SN2‐Michael Addition Sequence.
Authors: Gharpure Santosh J. , Reddy S. Raja Bhushan , Sanyal Udishnu
Published: November 2007

ChemInform 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 Formation of Spiro‐β‐lactams and Amides from Reaction of Cyclic Ketenes with Imines.
Authors: Oh Sun Joo , Jung Ki‐Hoon , Moon Byung‐Hyun , Ahn Chuljin
Published: November 2007

ChemInform 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 Study of the Claisen—Eschenmoser Reaction for Hydroxymethylbenzofurans and ‐indoles.
Authors: Mukhanova T. I. , Kukushkin S. Yu. , Ivanov P. Yu. , Alekseeva L. M. , Granik V. G.
Published: November 2007

ChemInform 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 α,β‐Unsaturated γ‐Lactams via Asymmetric Iridium‐Catalyzed Allylic Substitution.
Authors: Spiess Stephanie , Berthold Carola , Weihofen Robert , Helmchen Guenter
Published: November 2007

ChemInform 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.
Copper‐Catalyzed Synthesis of 2,3‐Disubstituted Indoles.
Authors: Tanimori Shinji , Ura Haruna , Kirihata Mitsunori
Published: November 2007

ChemInform 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.
Stereoselective Synthesis of Isoxazolidines Through Pd‐Catalyzed Carboetherification of N‐Butenylhydroxylamines.
Authors: Hay Michael B. , Wolfe John P.
Published: November 2007

ChemInform 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 and Antibacterial Activity of Bis[2‐amino‐4‐phenyl‐5‐thiazolyl] Disulfides.
Authors: Siddiqui Hamid Latif , Zia‐Ur‐Rehman Muhammad , Ahmad Naveed , Weaver George William , Lucas Paul David
Published: November 2007

ChemInform 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.
Iodine‐Promoted Prins‐Cyclization of Ketones — A Facile Synthesis of Spirocyclic‐4‐iodotetrahydropyrans and 5,6‐Dihydro‐2H‐pyrans.
Authors: Yadav J. S. , Reddy B. V. Subba , Krishna V. Hari , Swamy T. , Kumar G. G. K. S. Narayana
Published: November 2007

ChemInform 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 Synthesis of 2‐Aminobenzochromene Derivatives Catalyzed by Tetrabutylammoniumbromide (TBABr) under Microwave Irradiation in Aqueous Medium.
Authors: Paesha M. A. , Jayaeshankara V. P.
Published: November 2007

ChemInform 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.
Ring Expansion Induced by DAST: Synthesis of Substituted 3‐Fluoropiperidines from Prolinols and 3‐Fluoroazepanes from 2‐Hydroxymethylpiperidines.
Authors: Dechamps Ingrid , Gomez Pardo Domingo , Cossy Janine
Published: November 2007

ChemInform 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.
Improved Preparative Method for 1,2‐Diaryl‐3,4‐diphosphinidenecyclobutenes and Its Application to the Studies of 1,2‐Bis(arylthienyl)‐3,4‐diphosphinidenecyclobutenes.
Authors: Toyota Kozo , Horikawa Keiko , Jensen Rader S. , Omori Kouhei , Kawasaki Subaru , Ito Shigekazu , Yoshifuji Masaaki , Morita Noboru
Published: November 2007

ChemInform 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 Novel Stereoselective Synthesis of 1,2‐trans‐Thioaldoses.
Authors: Xue Weihua , Cheng Xiaoyun , Fan Jian , Diao Huajia , Wang Chunming , Dong Lei , Luo Yi , Chen Jiangning , Zhang Junfeng
Published: November 2007

ChemInform 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.
Biosynthetic Capacities of Actinomycetes. Part 41. Abyssomicins G and H and Atrop‐Abyssomicin C from the Marine Verrucosispora Strain AB‐18‐032.
Authors: Keller Simone , Nicholson Graeme , Drahl Carmen , Sorensen Erik , Fiedler Hans‐Peter , Suessmuth Roderich D.
Published: November 2007

ChemInform 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.
Cell‐Adhesion Inhibitors Produced by a Sea Hare‐Derived Periconia sp. Part 3. Absolute Stereostructures of Peribysin J and Macrosphelide M.
Authors: Yamada Takeshi , Minoura Katsuhiko , Tanaka Reiko , Numata Atsushi
Published: November 2007

ChemInform 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.
Functionalization of Zeolitic Cavities: Grafting NH2 Groups in Framework T Sites of B‐SSZ‐13 — A Way to Obtain Basic Solids Catalysts?
Authors: Regli Laura , Bordiga Silvia , Busco Claudia , Prestipino Carmelo , Ugliengo Piero , Zecchina Adriano , Lamberti Carlo
Published: November 2007

ChemInform 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.
Magnetism in V‐/Mn‐Doped ZnO Layers Fabricated on Sapphire
Authors: Mofor A. C. , Reuss F. , El‐Shaer A. , Kling R. , Schlenker E. , Bakin A. , Ahlers H. , Siegner U. , Sievers S. , Albrecht M. , et al. et al.
Published: November 2007

ChemInform 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 Catalyzed Arylation for the Synthesis of Polyarenes
Authors: Pascual Sergio , de Mendoza Paula , Echavarren Antonio M.
Published: November 2007

ChemInform 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.
Photochemical Transformations of Pyridinium Salts: Mechanistic Studies and Applications in Synthesis
Authors: Damiano Teresa , Morton Daniel , Nelson Adam
Published: November 2007

ChemInform 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 Catalysts: Towards Sustainable Chemistry
Authors: Ishida Tamao , Haruta Masatake
Published: November 2007

ChemInform 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.
Allenylzinc Reagents: New Trends and Synthetic Applications.
Authors: Botuha Candice , Chemla Fabrice , Ferreira Franck , Perez‐Luna Alejandro , Roy Brindaban
Published: November 2007

ChemInform 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.
Liquid Crystalline Dendrimers
Authors: Donnio Bertrand , Buathong Saiwan , Bury Izabela , Guillon Daniel
Published: November 2007

ChemInform 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.
Electrochemistry: An Important Tool to Study and Create New Sol—Gel‐Derived Materials
Authors: Collinson Maryanne M.
Published: November 2007

ChemInform 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 Routes in the Synthesis of Nanomaterials Using the Sol—Gel Process
Authors: Mackenzie John D. , Bescher Eric P.
Published: November 2007

ChemInform 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.
[NiFe] and [FeFe] Hydrogenases Studied by Advanced Magnetic Resonance Techniques
Authors: Lubitz Wolfgang , Reijerse Eduard , van Gastel Maurice
Published: November 2007

ChemInform 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.
Structure/Function Relationships of [NiFe]‐ and [FeFe]‐Hydrogenases
Authors: Fontecilla‐Camps Juan C. , Volbeda Anne , Cavazza Christine , Nicolet Yvain
Published: November 2007

ChemInform 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.
Hydrogen Production by Molecular Photocatalysis
Authors: Esswein Arthur J. , Nocera Daviel G.
Published: November 2007

ChemInform 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.
Critical Behavior of Irreversible Reaction Systems
Authors: Loscar Ernesto , Albano Ezequiel V.
Published: November 2007

ChemInform 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.
Sol—Gel with Phase Separation. Hierarchically Porous Materials Optimized for High‐Performance Liquid Chromatography Separations
Authors: Nakanishi Kazuki , Tanaka Nobuo
Published: November 2007

ChemInform 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.
Cell Motility on Micropatterned Treadmills and Tracks
Authors: Kandere‐Grzybowska Kristiana , Campbell Christopher J. , Mahmud Goher , Komarova Yulia , Soh Siowling , Grzybowski Bartosz A.
Published: November 2007

ChemInform 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.
Virtual Screening and Experimental Verification to Identify Potential Inhibitors of the ErmC Methyltransferase Responsible for Bacterial Resistance against Macrolide Antibiotics
Authors: Feder Marcin , Purta Elzbieta , Koscinski Lukasz , Čubrilo Sonja , Maravic Vlahovicek Gordana , Bujnicki Janusz M.
Published: November 2007

Methyltransferases from the Erm family catalyze S‐adenosyl‐L‐methionine‐dependent modification of a specific adenine residue in bacterial 23S rRNA, thereby conferring resistance to clinically important macrolide, lincosamide, and streptogramin B antibiotics. Thus far, no inhibitors of these enzymes have been identified or designed that would effectively abolish the resistance in vivo. We used the crystal structure of ErmC′ methyltransferase as a target for structure‐based virtual screening of a database composed of 58 679 lead‐like compounds. Among 77 compounds selected for experimental validation (63 predicted to bind to the catalytic pocket and 14 compounds predicted to bind to the putative RNA binding site), we found several novel inhibitors that decrease the minimal inhibitory concentration of a macrolide antibiotic erythromycin toward an Escherichia coli strain that constitutively expresses ErmC′. Eight of them have IC50 values in the micromolar range. Analysis of docking models of the identified inhibitors suggests a novel strategy to develop potent and clinically useful inhibitors.
Dynamics of Electrons in Ammonia Cages: The Discovery System of Solvation
Authors: Lee I‐Ren , Lee Wonchul , Zewail Ahmed H.
Published: November 2007

Two centuries ago solvated electrons were discovered in liquid ammonia and a century later the concept of the solvent cage was introduced. Here, we report a real time study of the dynamics of size‐selected clusters, n=20 to 60, of electrons in ammonia, and, for comparison, that of electrons in water cages. Unlike the water case, the observed dynamics for ammonia indicates the formation, through a 100 fs temperature jump, of a solvent collective motion in a 500 fs relaxation process. The agreement of the experimental results—obtained for a well‐defined n, gated electron kinetic energy, and time delay—with molecular dynamics theory suggests the critical and different role of the kinetic energy and the librational motions involved in solvation.
Palladium(II) Complexes with Phosphanylferrocenecarboxylate Ligands and Their Use as Catalyst Precursors for Semialternating CO–Ethylene Copolymerization
Authors: Bianchini Claudio , Meli Andrea , Oberhauser Werner , Segarra Anna Maria , Passaglia Elisa , Lamač Martin , Štěpnička Petr
Published: November 2007

Neutral [Pd(κP,κO‐P~O)(κ3C,C,C‐carbocycloenyl)] complexes, where P~O is a chiral or achiral chelating phosphanylferrocenecarboxylate ligand, were synthesized and characterized by multinuclear NMR spectroscopy. The crystalstructure of a representative complex was determined by single‐crystal X‐ray diffraction analysis. In all complexes, the palladium(II) ion is located at the centre of a square plane formed by the P and O donor atoms from an anionic P~O– ligand, a σ‐carbon atom and a C–C double bond from a carbocycloenyl ligand. Neutral methyl complexes with the formulas [PdCl(Me)(κP,κH‐P~OH)] and [Pd(Me)(OTs)(κP,κH‐P~OH)] were also synthesized and characterized. On the basis of IR, NMR and MS–FAB data, the methyl complexes are proposed to be formulated with the fourth coordination position occupied by an agostic O–H···Pd interaction from a free carboxylic acid moiety [P~OH = 1′‐(diphenylphosphanyl)ferrocenecarboxylic acid] or a solvent molecule. Selected complexes were employed as catalyst precursors for CO–ethylene copolymerization in MeOH in the presence of an excess of p‐toluenesulfonic acid. In all cases, low molecular weight semialternating polyketones were produced. The catalytic activities were rather low and the extra‐ethylene insertion reached a maximum value of 4.3 %. An operando high‐pressure NMR experiment with [Pd(Me)(S)2(κP‐P~OH)]OTs (S = solvent, adventitious water) precursor showed that this monocationic PdII alkyl complex is readily converted into a catalytically inactive binuclear carbonyl‐bridged PdI compound, which, however, regenerates catalytically active PdII–H species by reaction with TsOH and that β‐chelates of the formula [Pd(CH2CH2C(O)P)(S)(κP‐P~OH)]OTs (P = propagating polyketone chain) are catalyst resting states. For the first time, β‐chelate propagating species have been intercepted in a CO–olefin copolymerization assisted by catalysts devoid of a chelating ligand. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Complexes of Niobium(V) and Tantalum(V) Halides with Ligands that Contain N–C=O and P=O Functionalities: A Synthetic and Structural Study
Authors: Marchetti Fabio , Pampaloni Guido , Zacchini Stefano
Published: November 2007

The reactions of niobium and tantalum pentahalides, MX5, with dialkylureas (tetramethyl‐ and tetraethylurea, TMU and TEU, respectively), amides (N,N,dimethylformamide, DMF, N,N‐diethylformamide, DEF, N‐phenylacetamide, PhA), and P=O‐containing compounds (triphenylphosphane oxide, TPPO, and trimethyl phosphate, TMP) are not dependent on the reactant to metal molar ratio, and afford hexacoordinate complexes of the general formula MX5(L). The only exception is given by the reaction of TaBr5 with TMU, which proceeds by bromide migration from one metal center to another, and provides the ionic adduct [TaBr4(TMU)2][TaBr6]. Hydrolysis of TaCl5(TMP), due to adventitious water, has yielded the dinuclear species Ta2(μ‐O)Cl8(TMP)2. All compounds have been fully characterized in solution, and X‐ray crystal structures have been determined for NbCl5(TEU), NbCl5(DMF), TaCl5(DMF), TaCl5(PhA), TaBr5(PhA), TaCl5(TPPO), [TaBr4(TMU)2][TaBr6], and Ta2(μ‐O)Cl8(TMP)2. No evidence for formation of M=O bonds due to oxygen atom transfer from the ligand to the metal has been observed in any case. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Acid‐Induced and Reductive Transfor­mations of Enantiopure 3,6‐Dihydro‐2H‐1,2‐oxazines – Synthesis of Dideoxyamino Carbohydrate Derivatives
Authors: Bressel Bettina , Egart Boris , Al‐Harrasi Ahmed , Pulz Robert , Reißig Hans‐Ulrich , Brüdgam Irene
Published: November 2007

Acid‐catalyzed transformations of carbohydrate‐derived 3,6‐dihydro‐2H‐1,2‐oxazines such as 1, 5 and 13 provided a set of enantiopure furano‐1,2‐oxazines or pyrano‐1,2‐oxazines. The reaction conditions determined the degree of solvolysis of the compounds. An X‐ray analysis of product 6 revealed an interesting network of hydrogen bonds. Reductive cleavage of the N–O bond of the 1,2‐oxazines either by hydrogen/palladium or by samarium diiodide furnished enantiopure aminofuran and ‐pyran derivatives, e.g. 9 and 11 or compound 16, which can be regarded as protected 4‐amino‐1,4‐dideoxyhex‐3‐ulose or 4‐amino‐1,4‐dideoxyoct‐3‐ulose derivatives. We thus have established a short and stereocontrolled route to amino carbohydrate derivatives with 1,2‐oxazines as crucial relay compounds. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Early Carboniferous (Mississippian) calciturbidites in the northern Rhenish Mountains (Germany)
Authors: Korn D.
Published: November 2007

Viséan calciturbidites occur in two separate turbidite sequences at the northern margin of the Rhenish Mountains: (1) the Herdringen Sequence (Becke‐Oese, Retringen and Herdringen formations), and (2) the Hellefeld Sequence (Hellefeld, Linnepe and Wennemen formations). Both sequences show temporal fluctuations in the carbonate content, which can be related to global eustatic fluctuations. Two peaks of carbonate sedimentation which occurred during lowstands in the Holkerian to early Asbian and in the Brigantian are interrupted by a late Asbian decline of carbonate deposition during a transgressive interval. Patterns of bed thickness and carbonate content in the Herdringen Sequence indicate a sediment source to the north; it shifted during the Late Viséan from the northeast to the northwest. Coeval sediments in the Hellefeld Sequence were derived from a source to the southeast. Detailed analyses of Asbian sections show the high potential for fine‐scaled correlation. Copyright © 2007 John Wiley & Sons, Ltd.
Use of evidence in economic decision models: practical issues and methodological challenges
Authors: Cooper N. J. , Sutton A. J. , Ades A. E. , Paisley S. , Jones D. R. ,   on behalf of the working group on the ‘use of evidence in economic decision models’
Published: November 2007

This paper outlines the current ‘state of play’ regarding the use of evidence in decision modelling and highlights both practical issues and methodological challenges related to identifying, combining and reporting evidence to inform decision model parameters and structure. Based on discussions at two MRC HSRC‐funded workshops consisting of 37 experts from a range of disciplines (i.e. decision‐makers, health economists, information specialists, operations researchers and statisticians), it aims to derive a multi‐disciplinary standpoint on the appropriate use of evidence in economic decision models and, where applicable, offer some suggestions for good modelling practice. Gaps in the established methodology knowledge base are identified for future research. Copyright © 2007 John Wiley & Sons, Ltd.
3D elastic scattering theorems for point‐generated dyadic fields
Authors: Athanasiadis C. E. , Sevroglou V. , Stratis I. G.
Published: November 2007

The problem of scattering of elastic spherical waves by a rigid body, cavity or a penetrable obstacle in 3D linear elasticity is considered. For two point sources, dyadic far‐field pattern generators are defined, which are used for the formulation of a general scattering theorem. The main reciprocity principle and mixed scattering relations are also established. We provide the necessary energy considerations, presenting relative energy functionals and expressions for the differential and the scattering cross section due to point‐source dyadic incidence. Finally, an application of the general scattering theorem for appropriate locations of the point source leads to an optical theorem. Copyright © 2007 John Wiley & Sons, Ltd.