bluuebunny/crossref_metadata_2025_split huggingface dataset:
Alcohol Dehydrogenase‐Catalyzed Synthesis of Enantiomerically Pure δ‐Lactones as Versatile Intermediates for Natural Product Synthesis
Authors: Fischer Thomas , Pietruszka Jörg 
Published: August 2012

AbstractStarting from ethyl 4‐bromobutyrate, the chemoenzymatic synthesis of 6‐vinyl‐tetrahydro‐pyran‐2‐one has been accomplished. A screening of a number of available alcohol dehydrogenases and intense optimization of reaction parameters enabled us to establish an efficient synthesis of either enantiomer of the vinyllactone with excellent enantiomeric excess (>99%). The scope of possible applications of enantiopure vinyllactones has been verified by subjection to cross‐metathesis resulting in the total synthesis of the insect pheromone (S)‐5‐hexadecanolide and the cytotoxic styryllactone goniothalamine as well as derivatives thereof.
Copper Complex of Aminoisoborneol Schiff Base Cu2(SBAIB‐d)2: An Efficient Catalyst for Direct Catalytic Asymmetric Nitroaldol (Henry) Reaction
Authors: Boobalan Ramalingam , Lee Gene‐Hsian , Chen Chinpiao 
Published: August 2012

AbstractA new bifunctional copper complex of the aminoisoborneol Schiff base – Cu2(SBAIB‐d)2 – has been developed for the effective direct catalytic asymmetric Henry reaction. One mol% of this catalyst produces the expected Henry products in high yields (up to 99%) with excellent enantioselectivities (up to 98% ee). The utility of the present catalyst was also extended to the Henry reaction with nitroethane and 1‐nitropropane that furnished the corresponding products in moderate to high yields (up to 99%) with moderate to high enantioselectivities of syn (up to 98% ee) and anti (up to 98% ee) diastereomers. The highlights of this catalytic system are easy manipulation, air and moisture tolerance, the need for 1 mol% of an easily synthesizable catalyst and the high enantioselectivities achieved for a wide range of substrates.
Surface plasmon‐enhanced molecular fluorescence induced by gold nanostructures
Authors: Teng Y. , Ueno K. , Shi X. , Aoyo D. , Qiu J. , Misawa H. 
Published: August 2012

AbstractThe authors report on surface plasmon‐enhanced fluorescence of Eosin Y molecules induced by gold nanostructures. Al2O3 films deposited by atomic layer deposition with sub‐nanometer resolution were used as the spacer layer to control the distance between molecules and the gold surface. As the thickness of the Al2O3 film increased, the fluorescence intensity first increased and then decreased. The highest enhancement factor is achieved with a 1 nm Al2O3 film. However, the trend for the fluorescence lifetime is the opposite. It first decreased and then increased. The changes in the fluorescence quantum yield were also calculated. The yield shows a similar trend to the fluorescence intensity. The competition between the surface plasmon‐induced increase in the radiative decay rate and the gold‐induced fluorescence quenching is responsible for the observed phenomenon. In addition, this competition strongly depends on the thickness of the spacer layer between Eosin Y molecules and the gold surface.
Frontal polymerization of a cyanate ester
Authors: Viner Veronika 
Published: August 2012

AbstractThermal frontal polymerization is an exothermic process that uses a propagating wave to polymerize monomers via an external heat source, such as a soldering iron, to initiate front propagation. Herein, for the first time, the curing of a cyanate ester via thermal frontal polymerization is described with two different external heat sources. However, issues of bubbling due to vaporization of the amine catalyst generally resulted in incomplete frontal polymerization when a soldering iron was used as the external heat source. To counter this issue, dual‐strip polymerization systems were used, wherein the heat from the exothermic polymerization of a free‐radical system was used to initiate the frontal polymerization of a cyanate ester system with an amine catalyst. As a result, complete frontal polymerization occurred. Additionally, the effect of the width of the acrylate strip and its impact on the front temperature, initial velocity, and steady‐state velocity of the adjacent cyanate ester system were studied. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Preparation of nanostructured porous carbon composite fibers from ferrum alginate fibers
Authors: Wang Bingbing , Kong Qingshan , Quan Fengyu , Ji Quan , Xia Yanzhi 
Published: August 2012

AbstractNano‐microstructured porous carbon composite fibers (Fe2O3@C/FeO@C/Fe@C) were synthesized by the thermal decomposition of ferrum alginate fibers. The ferrum alginate fiber precursors were prepared by wet spinning, and calcined at 300–1000°C in high purity nitrogen. The resulting composite fibers consist of carbon coated Fe2O3/FeO/Fe nanoparticles and porous carbon fibers. All the prepared nanostructures were investigated using thermal gravimetry, X‐ray diffraction (XRD), Fourier transform infrared spectroscopy, transmission electron microscope (TEM), and nitrogen adsorption–desorption isotherm. The results show that there are five stages in the decomposition process of the ferrum alginate fibers. Transitions between the five stages are affected by the decomposition temperature. XRD results show that maghemite (Fe2O3), wüstite (FeO), martensite (Fe) nanoparticles were formed at 300–500°C, 600–700°C, 800–1000°C, respectively. Scanning electron microscopy and TEM results indicate that the composite fibers consist of nanoparticles and porous carbon. The diameter of the nanosized particles increased from 100 to 500 nm with increasing reaction temperature. The nitrogen adsorption–desorption results also show that the composite fibers have a micro‐ and mesoporous structure. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Preparation, characterization, antifungal activity, and mechanism of chitosan/TiO2 hybrid film against bipolaris maydis
Authors: Huang Qunzeng , Jiao Zhujin , Li Min , Qiu Dongfang , Liu Kecheng , Shi Hengzhen 
Published: August 2012

AbstractA chitosan/TiO2 hybrid film, as a powerful antifungal material for controlling southern corn leaf blight, which is caused by the fungus Bipolaris maydis (B. maydis), was prepared and characterized. Its antifungal activity toward B. maydis was studied, and the experimental results indicate that it had multiple attractive antifungal properties as follows: (1) it displayed strong antifungal activity against B. maydis, with an inhibition ratio of 100% under both visible‐light irradiation and in a dark environment; (2) it exhibited a superior antifungal efficacy of 100%, even after 4 h under the irradiation of visible light; and (3) its antifungal activity included the effect of hydroxyl radicals generated by the photocatalysis of TiO2. The antifungal mechanism was attributed to the action of a large amount of positive charges on the structure of the hybrid film, which interacted with the negative charges from the cell and finally resulted in the inactivation of B. maydis. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Damage modeling of degradable polymers under bulk erosion
Authors: Tang C. Y. , Wang Z. W. , Tsui C. P. , Bai Y. F. , Gao B. , Wu H. 
Published: August 2012

AbstractUnit micro‐cell models with different architectures were designed to simulate the degradation process and chemical damage behavior of degradable polymers under bulk erosion. The pores in the micro‐cell models were introduced to mimic the state of rapid water diffusion into the polymers under bulk erosion, while three different arrangements of pores were considered to investigate their effects on the degradation rate of different polymers with the same molecular weight. Different porosity levels were also used to study the degradation responses of the polymers having different molecular weights. A heat and mass transfer analogy was adopted to enable the analysis to be run on a general purpose finite element (FE) code. In the present work, a finite element software package ABAQUS incorporated with a user‐defined material subroutine was used to perform the analysis, in which a heat transfer function was utilized to simulate Fickian mass diffusion for the polymers through analogy. With the proposed method, the effects of chemical damage on the mechanical properties of the degradable polymers under bulk erosion could be predicted and the predicted trend of the mass loss of the polymers followed experimental results obtained from the open literature. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Millifluidic synthesis of polymer core‐shell micromechanical particles: Toward micromechanical resonators for acoustic metamaterials
Authors: Lukyanova L. , Séon L. , Aradian A. , Mondain‐Monval O. , Leng J. , Wunenburger R. 
Published: August 2012

AbstractWe present two routes of millifluidic‐based synthesis of solid core–solid shell particles with submillimeter size. These particles, which behave as mechanical resonators, are key components of targeted three‐dimensional locally resonant acoustic metamaterials working in the ultrasonic frequency range. The first route involves the encapsulation of a solid core into a liquid shell, which is then in‐line solidified through gelation. The second route involves two successive coflows followed by two solidifications triggered by UV irradiation and complexation, respectively. Original solutions to several practical issues are presented. The advantages and drawbacks of both routes are analyzed in the light of the targeted specifications of the resonators. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Nanocomposites of ethylene vinyl alcohol copolymer with thermally resistant cellulose nanowhiskers by melt compounding (I): Morphology and thermal properties
Authors: Martínez‐Sanz Marta , Lopez‐Rubio Amparo , Lagaron Jose M. 
Published: August 2012

AbstractIn this study, ethylene‐vinyl alcohol copolymer (EVOH) nanocomposites were prepared by melt compounding both plant cellulose nanowhiskers (CNW) and bacterial cellulose nanowhiskers (BCNW) as nanofillers. Electrospinning and a “dissolution precipitation” method were used as strategies for the incorporation of CNW in EVOH before melt compounding with the aim of enhancing the degree of dispersion of the nanocrystals when compared with direct melt‐mixing of the freeze‐dried product with the polymer. As revealed by morphological characterization, the proposed preincorporation methods led to a significant improvement in the dispersion of the nanofiller in the final nanocomposite films. Furthermore, it was possible to incorporate concentrations as high as 4 wt % BCNW without causing significant agglomeration of the nanofiller, whereas increasing the CNW concentration up to 3 wt % induced agglomeration. Finally, DSC studies indicated that the crystalline content was significantly reduced when the incorporation method led to a poor dispersion of the nanocrystals, whereas high‐nanofiller dispersion resulted in thermal properties similar to those of the neat EVOH. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Elongational flow mixing for manufacturing of graphite nanoplatelet/polystyrene composites
Authors: Oxfall Henrik , Rondin Jérôme , Bouquey Michel , Muller René , Rigdahl Mikael , Rychwalski Rodney W. 
Published: August 2012

AbstractManufacturing strategy is of prime importance for the appropriate incorporation of filler into a polymeric matrix, and this in particular refers to nanofillers. Herein, direct‐graphite nanoplatelets are used as filler in polystyrene. The as‐received filler material contained microscopic size agglomerates formed by nanoscopic size graphite nanoplatelets. Refining of the microagglomerates (break‐up) and production of, desirably, single graphene layers (exfoliation) is the ultimate target for controlling production and thus properties of the present materials. Several processing methods including microcompounding, roll‐milling/calendering, Brabender mixing chamber, and solvent processing are used and compared with elongational flow mixing by a newly developed mixer. For the present system, sonication with surfactant assistance solvent processing yields both good micro deagglomeration and production of thin graphene nanostacks/layers. Also the elongational flow mixing efficiently refines the microagglomerates. Solvent processing and microcompounding are more efficient than the other processes in the production of exfoliated thin graphene stacks/layers. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Benzo[1,2‐d:4,5‐d′]bisimidazoles as a Convenient Platform Towards Dyes that are Capable of Excited‐State Intramolecular Proton Transfer and of Two‐Photon Absorption
Authors: Tasior Mariusz , Hugues Vincent , Blanchard‐Desce Mireille , Gryko Daniel T. 
Published: August 2012

AbstractNew, strongly fluorescent benzo[1,2‐d:4,5‐d′]bisimidazoles have been prepared by the reaction of Bandrowski′s base with various aldehydes. Their structures were carefully designed to achieve efficient excited‐state intramolecular proton transfer and good two‐photon‐absorption (2PA) cross‐sections. Functional dyes that possessed both high fluorescence quantum yields and large Stokes shifts were prepared. A π‐expanded D‐A‐D derivative that possessed Φfl=50 % and σ2=230 GM in the spectroscopic area of interest for biological imaging is an excellent candidate as a fluorescent probe. Thanks to the presence of two reactive amino groups, such compounds can be easily transformed into probes for bioconjugation. All of these benzo[1,2‐d:4,5‐d′]bisimidazoles were also strongly fluorescent in the solid state.
Interior‐Point Method to Optimize Tire Force Allocation in 4‐Wheeled Vehicles Using High‐Level Sliding Mode Control with Adaptive Gain
Authors: Tavasoli Ali , Naraghi Mahyar 
Published: August 2012

AbstractNonlinear vehicle control allocation is achieved by distributing the control task to tire forces with nonlinear saturation constraints. The overall vehicle control is accomplished by developing a hierarchical scheme. First, a high‐level sliding mode control with adaptive gain is considered to obtain the body force/moment for stable vehicle motion. The proposed controller only requires online adaptation of control gains without acquiring the knowledge of upper‐bounds on system uncertainties. Then, optimal distribution of tire forces (ODF) with nonlinear saturation constraints is considered. The high‐level control objectives are mapped to individual tire forces by formulating a nonlinear optimization problem. The interior‐point (IP) method is adopted for a nonlinear programming task at each time step. Evaluation of the overall system is accomplished by simulation testing with a nine‐degrees‐of‐freedom vehicle nonlinear model. Comparison with a well‐recognized control system shows the effect of saturation constrained ODF (SCODF) on improving vehicle handling and stability.
Clinical profile and outcome of patients with severe aortic stenosis at high surgical risk: Single‐center prospective evaluation according to treatment assignment
Authors: Dvir Danny , Sagie Alexander , Porat Eyal , Assali Abid , Shapira Yaron , Vaknin‐Assa Hana , Shafir Gideon , Bental Tamir , Nevzorov Roman , Battler Alexander , Kornowski Ran 
Published: August 2012

BackgroundThe study sought to assess the clinical profile, outcome, and predictors for mortality of “real‐world” high‐risk severe aortic stenosis patients according to the mode of treatment assigned.MethodsPatients were referred to a dedicated clinic for meticulous screening and multidisciplinary team assessment and 343 were finally assigned treatment (age 81.3 ± 7.2 years, 42.3% men): transcatheter aortic valve replacement (TAVR) with the Edwards SAPIEN or CoreValve device, 100 (29.2%); surgical aortic valve replacement (SAVR), 61 (17.8%); balloon valvuloplasty (as definitive therapy), 27 (7.9%); medication only, 155 (45.2%). No patient was lost to follow‐up.ResultsThe balloon valvuloplasty group had a significantly higher 1‐month mortality rate (18.5%) than the TAVR group (3%, P = 0.006) and medical therapy group (3.9%; P = 0.004), without significant difference from the SAVR group (11.5%, P = 0.5). One‐year cumulative survival was significantly higher in the TAVR group (92%) than in the other groups (SAVR 71%, balloon valvuloplasty 61.5%, medication 65%; all P < 0.001). Among survivors, 1‐year rates of high functional class (NYHA I/II) were as follows: TAVR, 84.6%; SAVR, 63.3%; balloon valvuloplasty, 18.2%; medication, 21.4% (TAVR vs. SAVR, P = 0.04; SAVR vs. balloon valvuloplasty or medical therapy, P = 0.01). On multivariate regression analysis, renal failure (hazard ratio [HR] = 5.3, P < 0.001), not performing TAVR (HR = 4.9, P < 0.001), and pulmonary pressure (10 mm Hg, HR = 1.2, P = 0.02) were independent predictors of 1‐year mortality.ConclusionsTAVR, performed in carefully selected high‐risk patients, is associated with an excellent survival rate and high functional class. Patients treated with another of the available modalities, including SAVR, had a worse outcome, regardless of which alternative treatment they receive. © 2012 Wiley Periodicals, Inc.
ChemInform Abstract: Order/Disorder in YbNi1.+‐.xGa2.+‐. x (x ≤ 0.08): Crystal Structure, Thermal Expansion and Magnetic Properties.
Authors: Vasylechko L. , Burkhardt U. , Schnelle W. , Borrmann H. , Haarmann F. , Senyshyn A. , Trots D. , Hiebl K. , Grin Yu. 
Published: August 2012

AbstractThe title compound (‐0.08 ≤ x ≤ 0.08) is characterized by powder and single crystal XRD, neutron diffraction, XAS, NMR spectroscopy, magnetic measurements, and TB‐LMTO‐ASA band structure calculations.
ChemInform Abstract: Synthesis, Crystal Chemistry, and Magnetic Properties of RE7Li8Ge10 and Ln11Li12Ge16 (Ln: La—Nd, Sm): New Members of the [LnGe2]n[LnLi2Ge]m Homologous Series.
Authors: Guo Sheng‐Ping , You Tae‐Soo , Jung Ya‐Ho , Bobev Svilen 
Published: August 2012

AbstractThe title compounds are prepared from stoichiometric mixtures of the elements (Nb tubes, 1223—1273 K, 5 h) and characterized by powder and single crystal XRD, magnetic measurements, and TB‐LMTO‐ASA calculations.
ChemInform Abstract: Syntheses, Structures, Optical and Magnetic Properties of Ba2MLnSe5 (M: Ga, In; Ln: Y, Nd, Sm, Gd, Dy, Er).
Authors: Yin Wenlong , Feng Kai , Wang Wendong , Shi Youguo , Hao Wenyu , Yao Jiyong , Wu Yicheng 
Published: August 2012

AbstractThe new title compounds are prepared from mixtures of BaSe, Ga2Se3 or In2Se3, Ln, and Se (1323—1373 K, 48 h) and characterized by single crystal XRD, diffuse reflectance spectroscopy, magnetic susceptibility, and second harmonic generation measurements.
ChemInform Abstract: Dipolar Antiferromagnetism and Quantum Criticality in LiErF4.
Authors: Roennow Henrik M. , et al. et al. 
Published: August 2012

AbstractThe magnetic order, the classical phase transition, and the transition and fluctuations about the quantum critical point of the dipolar‐coupled antiferromagnet LiErF4 are characterized by neutron scattering, specific heat, and magnetic susceptibility measurements.
ChemInform Abstract: Microwave Assisted Preparation of Eu2+‐Doped Aakermanite Ca2MgSi2O7.
Authors: Birkel Alexander , Darago Lucy E. , Morrison Alasdair , Lory Laurianne , George Nathan C. , Mikhailovsky Alexander A. , Birkel Christina S. , Seshadri Ram 
Published: August 2012

AbstractThe title compound is prepared by a rapid and energy efficient microwave assisted solid state reaction of stoichiometric amounts of CaCO3, MgO, SiO2, and Eu2O3 using small amounts of H3BO3 as flux (domestic microwave oven).
ChemInform Abstract: [C7H10N][In3Se5]: A Layered Selenide with Two Indium Coordination Environments.
Authors: Ewing Sarah J. , Powell Anthony V. , Vaqueiro Paz 
Published: August 2012

Abstract[3,5‐Me2PyH][In3Se5] (I) is solvothermally synthesized from a mixture of In, Se, and 3,5‐dimethylpyridine (3,5‐Me2Py) in a molar ratio of 1.46:2.5:66 (autoclave, 185 °C, 10 d).
ChemInform Abstract: Quaternary Tellurides with Different Valent Ge Centers: Cs2Ge3M6Te14 (M: Ga, In).
Authors: Zhang Cheng‐Yi , Zhou Liu‐Jiang , Chen Ling 
Published: August 2012

AbstractThe new title compounds are synthesized by solid state reaction of Ga or In, Ge, Te, and excess CsCl acting as both Cs source and flux (sealed silica tube, 820 °C, 5 d; about 90% yield).
ChemInform Abstract: Synthesis of Cu2Mo6S8 Powders and Thin Films from Intermediate Oxides Prepared by Polymeric Precursor Method.
Authors: Boursicot S. , Bouquet V. , Peron I. , Guizouarn T. , Potel M. , Guilloux‐Viry M. 
Published: August 2012

AbstractThe title compound is prepared by an alternative chemical route derived from the polymeric precursor method based on the Pechini process.
ChemInform Abstract: High‐Pressure Synthesis, Crystal Structure, and Electromagnetic Properties of CdRh2O4: An Analogous Oxide of the Postspinel Mineral MgAl2O4.
Authors: Guo Yanfeng , et al. et al. 
Published: August 2012

AbstractA postspinel phase of CdRh2O4 is prepared by solid state reaction of a stoichiometric mixture of CdO and Rh2O3 (Au capsule, 6 GPa, 1400 °C, 1 h).
ChemInform Abstract: Self‐Assembly of Polyoxotungstate with Tetrarhodium‐oxo Core: Synthesis, Structure and 183W NMR Studies.
Authors: Sokolov Maxim N. , Adonin Sergey A. , Abramov Pavel A. , Mainichev Dmitry A. , Zakharchuk Nina F. , Fedin Vladimir P. 
Published: August 2012

AbstractThe new sandwich‐type polyoxometalate Na12 [{Rh4(μ3‐O)2 (H2O)2} (H2W9O33)2] ·38H2O is synthesized hydrothermally from an aqueous solution of Rh2(OAc)4 and Na10[H2W12O42] or Na2WO4 (Parr digestion bomb, pH 5.8, 125 °C, 24 h; 90% yield).
ChemInform Abstract: Catalytic Enantioselective Conjugate Addition of Grignard Reagents to Cyclic Enones Using C1‐1,1′‐Bisisoquinoline‐Based Chiral Ligands.
Authors: Qi Gao , Judeh Zaher M. A. 
Published: August 2012

AbstractA new family of highly strained bisisoquinoline ligands is tested in the asymmetric conjugate addition of Grignards reagents towards cyclic α,β‐unsaturated ketones.
ChemInform Abstract: Asymmetric Hydrovinylation of 1‐Vinylcycloalkenes. Reagent Control of Regio‐ and Stereoselectivity.
Authors: Page Jordan P. , RajanBabu T. V. 
Published: August 2012

AbstractIn the presence of methylalumoxane and catalytic amounts of a chiral Co(II) complex, the vinylcycloalkenes undergo a highly regio‐and enantioselective 1,4‐hydrovinylation reaction.
ChemInform Abstract: Rh2(S‐PTTL)3TPA — A Mixed‐Ligand Dirhodium(II) Catalyst for Enantioselective Reactions of α‐Alkyl‐α‐diazoesters.
Authors: Boruta David T. , Dmitrenko Olga , Yap Glenn P. A. , Fox Joseph M. 
Published: August 2012

AbstractTitle ligand (I) is readily prepared and its structure is determined by computational and crystallographic studies to be similar to that of the known chiral crown complex Rh2((S)‐PTTL)4.
ChemInform Abstract: Organocatalytic Asymmetric Oxy‐Michael Addition to a γ‐Hydroxy‐α,β‐Unsaturated Thioester via Hemiacetal Intermediates.
Authors: Okamura Takaaki , Asano Keisuke , Matsubara Seijiro 
Published: August 2012

AbstractMichael addition of carbonyl compounds (II) towards γ‐hydroxy‐α,β‐unsaturated thioester (I) proceeds smoothly in the presence of a bifunctional Cinchona alkaloid—thiourea catalyst to afford hemiacetals (III)/(IV) with moderate diastereo‐ and high enantioselectivity.
ChemInform Abstract: Enantioselective Rh(I)‐Catalyzed Cyclization of Arylboron Compounds onto Ketones.
Authors: Low Darryl W. , Pattison Graham , Wieczysty Martin D. , Churchill Gwydion H. , Lam Hon Wai 
Published: August 2012

AbstractIn the presence of appropriate chiral Rh catalysts, boron compounds of type (I), (V), (VII), and (IX) undergo cyclization to afford isoquinoline, dibenzoazepine, fluorene, or benzofuran derivatives with high enantioselectivity.
ChemInform Abstract: Synthesis of Ketone from Alkyl Halide Using α‐Chloro Nitrone as Oxidizing Reagent: A New Approach.
Authors: Chakraborty Bhaskar , Sharma Prawin Kumar 
Published: August 2012

AbstractCompound (IV), formed as by‐product during the oxidation of isopropyl bromide (Ia) with N‐phenyl α‐chloronitrone in low yield, can itself undergo cycloaddition reaction.