bluuebunny/crossref_metadata_2025_split huggingface dataset:
Polyfluorene copolymer with a multiply blocked rotaxane architecture in the main chain: Synthesis and characterization
Authors: Farcas Aurica , Jarroux Nathalie , Guégan Philippe , Fifere Adrian , Pinteala Mariana , Harabagiu Valeria 
Published: August 2008

AbstractTo improve the physical properties of polymer materials, a novel copolymer with a multiply blocked rotaxane architecture in the main chain was synthesized through Suzuki dehalogenative polycondensation from a 2,7‐dibromofluorene/γ‐cyclodextrin (γ‐CD) inclusion complex and 9,9‐dioctylfluorene‐2,7‐trimethylene diborate in the presence of a tetrakis(triphenylphosphine)palladium(0) catalyst. As demonstrated by computational calculations, the dioctyl groups were large enough to prevent the dethreading of γ‐CD molecules. A copolymer polyrotaxane with a γ‐CD/structural unit ratio as high as 1/1.4 and a bimodal molecular weight distribution was obtained, as proved by its 1H‐NMR spectrum and size exclusion chromatography curve, respectively. The polyrotaxane showed lower thermal stability and higher solubility in polar solvents in comparison with the noncomplexed homologue. The fluorescence spectra of both the complexed and noncomplexed copolymers exhibited typical well‐resolved blue emission bands that arose from the fluorene chromophore units. In dimethylformamide solutions, the ratio of the intensities of the peaks of the emission spectra (emission spectra intensities413 for the 0–0 band and emission spectra intensities437 for the 0–1 band) was higher for the polyrotaxane than the noncomplexed copolymer, and this demonstrated a reduced quenching effect of the environment induced by the protection of the polymer chain by the macrocycle. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Flame retardancy and dielectric properties of dicyclopentadiene‐based benzoxazine cured with a phosphorus‐containing phenolic resin
Authors: Hwang Hann‐Jang , Lin Chi‐Y. , Wang Chun‐Shan 
Published: August 2008

AbstractA dicyclopentadiene‐based benzoxazine (DCPDBZ) was prepared and separately copolymerized with melamine–phenol formaldehyde novolac or phosphorus‐containing phenolic resin (phosphorus‐containing diphenol) at various molar ratios. Their curing behaviors were characterized by differential scanning calorimetry. The electrical properties of the cured resins were studied with a dielectric analyzer. The glass‐transition temperatures were measured by dynamic mechanical analysis. The thermal stability and flame retardancy were determined by thermogravimetric analysis and a UL‐94 vertical test. These data were compared with those of bisphenol A benzoxazine and 4,4′‐biphenol benzoxazine systems. The effects of the diphenol structure and cured composition on the dielectric properties, moisture resistance, glass‐transition temperature, thermal stability, and flame retardancy are discussed. The DCPDBZ copolymerized with phosphorus‐containing novolac exhibited better dielectric properties, moisture resistance, and flame retardancy than those of the melamine‐modified system. The flame retardancy of the cured benzoxazine/phosphorus‐containing phenolic resins increased with increasing phosphorus content. The results indicate that the bisphenol A and 4,4′‐biphenol systems with a phosphorus content of about 0.6% and the dicyclopentadiene system with a phosphorus content of about 0.8% could achieve a flame‐retardancy rating of UL‐94 V‐0. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Surface modification of starch nanocrystals through ring‐opening polymerization of ε‐caprolactone and investigation of their microstructures
Authors: Namazi Hassan , Dadkhah Abbas 
Published: August 2008

AbstractBionanoparticles of starch obtained by submitting native potato starch granules to acid hydrolysis conditions. The resulted starch nanoparticles were used as core or macro initiator for polymerization of ε‐caprolactone (CL). Starch nanoparticle‐g‐polycaprolactone was synthesized through ring‐opening polymerization (ROP) of CL in the presence of Sn(Oct)2 as initiator. The detailed microstructure of the resulted copolymer was characterized with NMR spectroscopy. Thermal characteristic of the copolymer was investigated using DSC and TGA. By introducing PCL, the range of melting temperature for starch was increased and degradation of copolymer occurred in a broader region. X‐ray diffraction and TEM micrographs confirmed that there was no alteration of starch crystalline structure and morphology of nanoparticles, respectively. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Synthesis of 2,3‐Disubstituted 1,4‐Naphthoquinones as Antiplatelet Agents
Authors: Lien Jin‐Cherng , Wu Chi‐Rei , Hour Mann‐Jen , Huang Li‐Jiau , Huang Tur‐Fu , Kuo Sheng‐Chu 
Published: August 2008

AbstractIn continuing search for novel antiplatelet agents, the highly potent agent 2‐chloro‐3‐methoxycarbonylethylcarboxamido‐1,4‐naphthoquinone 2 was selected as lead compound. Structure‐activity relationships in this series were examined. Some of these compounds showed significant antiplatelet activities. Further studies on the action mechanism showed that 2‐acetamido‐3‐chloro‐1,4‐naphthoquinone 4 has a direct inhibitory action on cytosolic phospholipase A2 (cPLA2) activity in platelets.
Rissbreitenberechnung für Elementwände und ‐decken aus Stahlbeton für Zwangbeanspruchungen rechtwinklig zu den Elementfugen
Authors: Meichsner Heinz , Rudolph Matthias 
Published: August 2008

AbstractElementwände und ‐decken ähneln in ihrer Lastabtragung geometrisch identischen monolithischen Bauteilen. Das gilt auch für die Wirkung einer Zwangdehnung aus behinderter Bauteilverkürzung, wenn sie in der Haupttragrichtung auftritt. Im Unterschied dazu unterscheiden sich die Tragwerke aus Halbfertigteilen von den monolithischen Konstruktionen in ihrem Verhalten bei Zwangbeanspruchung quer zur Spannrichtung. Die Elementfugen bilden Kerbstellen, an denen unter Zugbeanspruchung Risse schon bei geringer Bauteildehnung entstehen. Dabei ist der Rissabstand durch das Fugenraster vorgegeben. Eine Phase der Einzelrissbildung, wie sie bei monolithischen Bauteilen zu beobachten ist, gibt es praktisch nicht. Nach einer sehr kurzen Phase der Einzelrissbildung, die mit dem Riss in der letzten Elementfuge abgeschlossen ist, entsteht bereits bei relativ kleinen Zwangdehnungen ein abgeschlossenes Rissbild. Die Betondehnung zwischen den Rissen spielt wegen des größeren Rissabstands (Elementbreite) eine größere Rolle als bei monolithischen Bauteilen. Breitere Fertigteile erfordern zur Einhaltung der gleichen Rissbreiten eine größere Mindestbewehrung über die Elementfuge hinweg. Die Mindestbewehrung rechtwinklig zur Montagefuge ist größer als bei vergleichbaren monolithischen Bauteilen. Für die Berechnung der Rissbreiten und der Mindestbewehrung gekerbter Querschnitte wird ein Verfahren vorgeschlagen.
Yeditepe University computer integrated manufacturing studies
Authors: Sisbot Sedat , Tunc Murat , Çamdalı Ünal , Turkkan Yucel 
Published: August 2008

AbstractThe role of manufacturing enterprises in developing countries is more significant for economic prosperity than the developed countries since financial institutions are not well established. Today, the capability of producing high quality products with shorter delivery times and the ability to produce according to the diverse customer requirements have become the characteristics required for order‐qualifiers for manufacturing industries. Computer Integrated Manufacturing (CIM) systems have become the backbone of modern manufacturing paradigm for not only being profitable but also staying in business at any corner of the world. In this respect academies play a prominent role to produce well equipped engineers being ready to take the challenge of maintaining and improving CIM systems. This paper is an effort to illustrate a prototype design and manufacturing project with necessary improvements in an educational CIM laboratory by addressing to the courses in the curriculum of Systems Engineering at Yeditepe University. Following to the insightful introduction to the laboratory facilities, the design, simulation and implementation of the prototype are presented. The results obtained are discussed from system engineering education perspective. © 2008 Wiley Periodicals, Inc. Comput Appl Eng Educ 17: 1–12, 2009; Published online in Wiley InterScience (www.interscience.wiley.com); DOI 10.1002/cae20144
Conformational Choice and Selectivity in Singly and Multiply Hydrated Monosaccharides in the Gas Phase
Authors: Cocinero Emilio J. , Stanca‐Kaposta E. Cristina , Scanlan Eoin M. , Gamblin David P. , Davis Benjamin G. , Simons John P. 
Published: August 2008

AbstractFactors governing hydration, regioselectivity and conformational choice in hydrated carbohydrates have been examined by determining and reviewing the structures of a systematically varied set of singly and multiply hydrated monosaccharide complexes in the gas phase. This has been achieved through a combination of experiments, including infrared ion‐depletion spectroscopy conducted in a supersonic jet expansion, and computation through molecular mechanics, density functional theory (DFT) and ab initio calculations. New spectroscopic and/or computational results obtained for the singly hydrated complexes of phenyl β‐D‐mannopyranoside (β‐D‐PhMan), methyl α‐D‐gluco‐ and α‐D‐galactopyranoside (α‐D‐MeGlc and α‐D‐MeGal), when coupled with those reported earlier for the singly hydrated complexes of α‐D‐PhMan, β‐D‐PhGlc and β‐D‐PhGal, have created a comprehensive data set, which reveals a systematic pattern of conformational preference and binding site selectivity, driven by the provision of optimal, co‐operative hydrogen‐bonded networks in the hydrated sugars. Their control of conformational choice and structure has been further revealed through spectroscopic and/or computational investigations of a series of multiply hydrated complexes; they include β‐D‐PhMan⋅(H2O)2,3, which has an exocyclic hydroxymethyl group, and the doubly hydrated complex of phenyl α‐L‐fucopyranoside, α‐L‐PhFuc⋅(H2O)2, which does not. Despite the very large number of potential structures and binding sites, the choice is highly selective with binding invariably “focussed” around the hydroxymethyl group (when present). In β‐D‐PhMan⋅(H2O)2,3, the bound water molecules are located exclusively on its polar face and their orientation is dictated by the (perturbed) conformation of the carbohydrate to which they are attached. The possible operation of similar rules governing the structures of hydrogen‐bonded protein–carbohydrate complexes is proposed.
ChemInform Abstract: Crystal Growth of MgAlB14‐Type Compounds Using Metal Salts and Some Properties.
Authors: Okada Shigeru , Shishido Toetsu , Mori Takao , Iizumi Kiyokata , Kudou Kunio , Nakajima Kazuo 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: TiCl4/tert‐Butyl Hydroperoxide: Chemioselective Oxidation of Secondary Alcohols and Suppression of Sharpless Epoxidation.
Authors: Shei Chun‐Tin , Chien Hao‐Lun , Sung Kuangsen 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Metal‐Free Catalytic Hydrogenation of Imines with Tris(perfluorophenyl)borane.
Authors: Chen Dianjun , Klankermayer Juergen 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Hydrogen‐Transfer Reduction of Carbonyl Compounds Promoted by Nickel Nanoparticles.
Authors: Alonso Francisco , Riente Paola , Yus Miguel 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Reaction of Secondary and Tertiary Aliphatic Halides with Aromatic Aldehydes Mediated by Chromium(II): A Selective Cross‐Coupling of Alkyl and Ketyl Radicals.
Authors: Wessjohann Ludger A. , Schmidt Gisela , Schrekker Henri S. 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Regioselective C—H Functionalization Directed by a Removable Carboxyl Group: Palladium‐Catalyzed Vinylation at the Unusual Position of Indole and Related Heteroaromatic Rings.
Authors: Maehara Atsushi , Tsurugi Hayato , Satoh Tetsuya , Miura Masahiro 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: An Expedient Three‐Component Approach to the Synthesis of α,α‐Disubstituted Amines under Barbier‐Like Conditions.
Authors: Sengmany Stephane , Le Gall Erwan , Troupel Michel 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Fluoride Ion‐Catalyzed Conjugate Addition for Easy Synthesis of 3‐Sulfanylpropionic Acid from Thiol and α,β‐Unsaturated Carboxylic Acid.
Authors: Gao Shijay , Tseng Chi , Tsai Cheng Hsuan , Yao Ching‐Fa 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Taurine Isothiocyanate: A Versatile Intermediate for the Preparation of Ureas, Thioureas, and Guanidines. Taurine‐Derived Cyclodextrins.
Authors: Marquez Jose M. , Lopez Oscar , Maya Ines , Fuentes Jose , Fernandez‐Bolanos Jose G. 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Bi(OTf)3‐Catalyzed 5‐exo‐Trig Cyclization via Halide Activation.
Authors: Hayashi Ryuji , Cook Gregory R. 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Desymmetrization of Metalated Cyclohexadienes with Chiral N‐tert‐Butanesulfinyl Imines.
Authors: Maji Modhu Sudan , Froehlich Roland , Studer Armido 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Tandem [2 + 1] Cycloaddition—Ring Expansion of Bicyclic Alkenes with Tertiary Propargylic Acetates Catalyzed by Palladium(II)‐Coordinated Phosphinous Acid.
Authors: Bigeault Julie , de Riggi Innocenzo , Gimbert Yves , Giordano Laurent , Buono Gerard 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Zn‐Mediated Rhodium‐Catalyzed α‐Trifluoromethylation of Ketones via Silyl Enol Ethers.
Authors: Sato Kazuyuki , Yuki Takashi , Tarui Atsushi , Omote Masaaki , Kumadaki Itsumaro , Ando Akira 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Asymmetric Nitroaldol Reaction Catalyzed by a C2‐Symmetric Bisoxazolidine Ligand.
Authors: Liu Shuanglong , Wolf Christian 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: One‐Pot Reductive Amination of Aldehydes Catalyzed by a Hydrio‐Iridium(III) Complex in Aqueous Medium.
Authors: Lai Rung‐Yi , Lee Chun‐I , Liu Shiuh‐Tzung 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Steric Effects in Palladium‐Catalyzed Amination of Aryl Triflates and Nonaflates with the Primary Amines PhCH(R)NH2 (R: H, Me).
Authors: Meadows Rebecca E. , Woodward Simon 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Cooperative Broensted Acid‐Type Organocatalysis: Alcoholysis of Styrene Oxides.
Authors: Weil Torsten , Kotke Mike , Kleiner Christian M. , Schreiner Peter R. 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: PPh3‐Catalyzed Synthesis of Multifunctional Vinylesters from Terminal Alkynoates and Aromatic Aldehydes.
Authors: Meng Ling‐Guo , Tang Kai , Guo Qing‐Xiang , Xue Song 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Asymmetric Synthesis of β,β‐Difluoroamino Acids via Cross‐Coupling and Strecker Reactions.
Authors: Wang Xiao‐Jin , Zhang Fan , Liu Jin‐Tao 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: BiCl3‐Catalyzed Nucleophilic Substitution of Baylis—Hillman Adducts with Alcohols.
Authors: Li Jian , Liu Xiaotao , Jia Xueshun 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Microwave‐Assisted Michael Addition of Amides to α,β‐Unsaturated Esters under Solvent‐Free Conditions.
Authors: Zare A. , Hasaninejad A. , Parhami A. , Zare A. R. Moosavi , Khalafi‐Nezhad A. 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Palladium‐Catalyzed Aromatic Esterification of Aldehydes with Organoboronic Acids and Molecular Oxygen.
Authors: Qin Changming , Wu Huayue , Chen Jiuxi , Liu Miaochang , Cheng Jiang , Su Weike , Ding Jinchang 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Palladium‐Catalyzed Hydroarylation of Alkynes with Arenediazonium Salts.
Authors: Cacchi Sandro , Fabrizi Giancarlo , Goggiamani Antonella , Persiani Daniela 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of 1‐Arylidene‐2,3‐dihydro‐1H‐inden‐2‐ols Through a Tandem Carbopalladation/Suzuki—Miyaura Sequence.
Authors: Marchal Estelle , Cupif Jean‐Francois , Uriac Philippe , van de Weghe Pierre 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of 4‐Methoxy‐1H‐phenalen‐1‐one: A Subunit Related to Natural Phenalenone‐Type Compounds.
Authors: Nanclares Juliana , Gil Jesus , Rojano Benjamin , Saez Jairo , Schneider Bernd , Otalvaro Felipe 
Published: August 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.