bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis and characterization of poly(ester amides)s with a variable ratio of branched odd diamide units
Authors: Murase Sara K. , Franco Lourdes , del Valle Luís J. , Puiggalí Jordi 
Published: November 2013

ABSTRACTThe synthesis of a series of poly(ester amide)s constituted by glycolic acid, adipic acid, and different ratios of 1,3‐pentanediamine and 1,5‐pentanediamine units was studied and the derived copolymers were characterized. Thermal polycondensation between the potassium adipate salt and the appropriate ratio of N,N′‐bis(chloroacetyl)‐1,3‐pentanediamine and N,N′‐bis(chloroacetyl)‐1,5‐pentanediamine was proved to be effective, proceeded with high yield, and rendered samples with moderate molecular weight for carefully controlled competitive thermal degradation reactions. Physical properties were highly dependent on the final composition. In particular, crystallinity and thermal stability decreased with 1,3‐pentanediamine unit content, that is, with the incorporation of lateral ethyl groups into the main chain. The presence of these units also changed solubility in solvents like methanol and degradability in a protease K enzymatic medium. Specifically, incorporation of 1,3‐pentanediamine units led to a gradual increase in degradability. All poly(ester amide)s were able to establish intermolecular hydrogen bonding interactions, which in semicrystalline samples pointed to typical sheet structures of polyamides according to X‐ray diffraction and infrared spectroscopic data. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40102.
Biodegradable poly (butylene succinate‐co‐cyclohexanedimethylene succinate): Synthesis, crystallization, morphology, and rheology
Authors: Wan Tong , Du Tao , Liao Shuang 
Published: November 2013

ABSTRACTPoly (butylene succinate‐co‐cyclohexanedimethylene succinate) (PBCSs), which are composed of various amounts of cyclohexanedimethylene succinate (CS) with butylene succinate (BS) were synthesized via polycondensation. The composition of PBCSs was analyzed by a 1H‐nuclear magnetic resonance (1H‐NMR). Crystallization, morphology, and rheological properties of PBCSs were investigated by a polarized optical microscopy (POM), a differential scanning calorimetry (DSC), a X‐ray diffraction (XRD), and a parallel‐plate rheometer (PPR). The studies revealed that the composition of PBCSs played an important role in controlling their properties. Only one Tg can be seen for PBCSs by DSC, which demonstrate they are miscible copolymers. PBCSs exhibited lower crystallization capacity than its homopolyesters either Poly (butylene succinate) (PBS) or poly (cyclohexanedimethylene succinate) (PCS). It also proved that the cyclohexyl group of CHDM not only affected the crystalline formation, but also changed spherulitic morphology during crystallization. The spherulitic size gradually decreased with an increase of CS content. When CS content approached 50 wt %, the crystallization ability reached minimum. By comparing the effect of temperature with shear rate, it concluded that the viscosities of PBCSs were more sensitive to temperature rather than shear rate, and flow activation energies of PBCSs linearly increased with an increase of CS content. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40103.
Investigations on rheological properties and gelation of tasar regenerated silk fibroin solution
Authors: Lakkegowda Yogesha , Ammannappa Raghu , Ananthamurthy Sharath 
Published: November 2013

AbstractTasar silk is a variety of non‐mulberry silk indigenous to the Indian subcontinent. We present the measured frequency‐dependent viscoelastic moduli of Tasar regenerated silk fibroin (RSF) solution using optical tweezers at two concentrations (0.16% and 0.25% w/v) and extend these measurements to the low frequency regime using a video microscopy technique. We extend the investigation on the rheological behavior of Tasar RSF for four more RSF concentrations, viz., 0.50%, 1.00%, 2.50% and 5.00% using video microscopy. In all the RSF samples, both storage and loss moduli are found to increase with frequency. At lower frequencies the loss modulus is more than the storage modulus and exhibit similar behavior until a crossover frequency beyond which the storage modulus exceeds the loss modulus at all frequencies. The relaxation time which is inversely related to the crossover frequency is found to rise sharply at 5% w/v, indicating the onset of gelation in the sample. These results are examined in relation to the viscoelastic parameters of mulberry silk, wherein the larger crossover frequencies at the same higher concentrations indicate relaxation times that are an order of magnitude smaller than those measured for Tasar RSF. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2014,131, 40104.
Feasibility and safety of transfemoral implantation of Edwards SAPIEN XT prosthesis without balloon valvuloplasty in severe stenosis of native aortic valve
Authors: García Eulogio , Martín Patricia , Hernández Rosana , Rodríguez Victor , Fernández Abelardo , Gama Vasco , Almería Carlos , Macaya Carlos 
Published: November 2013

ObjectivesBalloon valvuloplasty (BV) before transcatheter aortic implantation has been thought to be mandatory before the valve is implanted. We have explored the feasibility and safety of direct implantation of balloon expandable Edwards SAPIEN XT valve without prior balloon dilatation.BackgroundSome complications after transcatheter aortic valve replacement (TAVR) have been associated with unwanted effects of BV, mainly the contribution to stroke and severe aortic regurgitation (AR) before the valve is implanted. Direct implantation with a self‐expanding aortic valve has been recently reported.MethodsFrom November 2011 to April 2012, ten patients were selected that met the following criteria in the transesophageal echocardiography (TEE): moderate calcification, homogeneous distribution of calcium, symmetrical opening of the valve, and some degree of aortic insufficiency.ResultsAll patients had symptomatic aortic stenosis of a native valve and high surgical risk; six patients had the valve mildly calcified, in four patients the degree of calcification was moderate. The native valve was crossed and the prosthetic aortic valve was properly positioned in all cases and implanted in the correct position. No patient underwent post‐dilatation and trivial AR was present in four patients. There were no adverse events (death, need for pacemaker, myocardial infarction, or stroke). At 30 days post‐procedure, all patients were alive and had significant clinical improvement.ConclusionsDirect implantation of Edwards SAPIEN XT without prior BV in selected cases is feasible and safe. The number of patients in whom this technique would be applicable, and their impact on reducing complications has to be determined. © 2013 Wiley Periodicals, Inc.
A prospective observational multicenter study of balloon angioplasty for the treatment of native and recurrent coarctation of the aorta
Authors: Harris Kevin C. , Du Wei , Cowley Collin G. , Forbes Thomas J. , Kim Dennis W. ,   On Behalf of the Congenital Cardiac Intervention Study Consortium (CCISC)
Published: November 2013

ObjectivesBalloon angioplasty (BA) is an important treatment option for coarctation of the aorta. The congenital cardiovascular interventional study consortium (CCISC) represents a multi‐institutional and multi‐national effort to prospectively investigate congenital cardiac interventions. A prospective observational analysis of the efficacy and safety of balloon aortic angioplasty was conducted.MethodsData were collected prospectively from 36 CCISC sites from 2004 to 2012. One hundred and thirty patients underwent BA for native (n = 76) and recurrent (n = 54) coarctation. Acute, short‐term, and intermediate outcomes are described for BA performed in the setting of native and recurrent coarctation of the aorta. Outcome measures included residual upper to lower extremity blood pressure gradient (ULG), use of antihypertensive medications, aortic wall injury, reobstruction, and need for reintervention.ResultsThere was no procedural mortality. Acutely in native and recurrent coarctation, BA achieved an ULG less than 15 mm Hg in 73–80% and to less than 10 mm Hg in 54–68% of patients, respectively. At intermediate follow‐up, ULG further improved, particularly for those who underwent initial reintervention for recurrent coarctation. No significant differences in aortic wall complications were seen and intervention free survival was similar for both groups. Following angioplasty, there was no significant difference in aortic wall complications; however follow up integrated imaging decreased over time.ConclusionsBA is a safe and effective treatment for coarctation of the aorta acutely and at intermediate term. Although aortic injury occurred in patients with both native and recurrent coarctation, at intermediate follow‐up, aneurysm was noted more often in those with initial intervention for native coarctation. © 2013 Wiley Periodicals, Inc.
DBD Dyes as Fluorescence Lifetime Probes to Study Conformational Changes in Proteins
Authors: Wawrzinek Robert , Ziomkowska Joanna , Heuveling Johanna , Mertens Monique , Herrmann Andreas , Schneider Erwin , Wessig Pablo 
Published: November 2013

AbstractPreviously, [1,3]dioxolo[4,5‐f][1,3]benzodioxole (DBD)‐based fluorophores used as highly sensitive fluorescence lifetime probes reporting on their microenvironmental polarity have been described. Now, a new generation of DBD dyes has been developed. Although they are still sensitive to polarity, in contrast to the former DBD dyes, they have extraordinary spectroscopic properties even in aqueous surroundings. They are characterized by long fluorescence lifetimes (10–20 ns), large Stokes shifts (≈100 nm), high photostabilities, and high quantum yields (>0.56). Here, the spectroscopic properties and synthesis of functionalized derivatives for labeling biological targets are described. Furthermore, thio‐reactive maleimido derivatives of both DBD generations show strong intramolecular fluorescence quenching. This mechanism has been investigated and is found to undergo a photoelectron transfer (PET) process. After reaction with a thiol group, this fluorescence quenching is prevented, indicating successful bonding. Being sensitive to their environmental polarity, these compounds have been used as powerful fluorescence lifetime probes for the investigation of conformational changes in the maltose ATP‐binding cassette transporter through fluorescence lifetime spectroscopy. The differing tendencies of the fluorescence lifetime change for both DBD dye generations promote their combination as a powerful toolkit for studying microenvironments in proteins.
Cation‐Mediated Conversion of the State of Charge in Uranium Arene Inverted‐Sandwich Complexes
Authors: Camp Clément , Mougel Victor , Pécaut Jacques , Maron Laurent , Mazzanti Marinella 
Published: November 2013

AbstractTwo new arene inverted‐sandwich complexes of uranium supported by siloxide ancillary ligands [K{U(OSi(OtBu)3)3}2(μ‐η6:η6‐C7H8)] (3) and [K2{U(OSi(OtBu)3)3}2(μ‐η6:η6‐C7H8)] (4) were synthesized by the reduction of the parent arene‐bridged complex [{U(OSi(OtBu)3)3}2(μ‐η6:η6‐C7H8)] (2) with stoichiometric amounts of KC8 yielding a rare family of inverted‐sandwich complexes in three states of charge. The structural data and computational studies of the electronic structure are in agreement with the presence of high‐valent uranium centers bridged by a reduced tetra‐anionic toluene with the best formulation being UV–(arene4−)–UV, KUIV–(arene4−)–UV, and K2UIV–(arene4−)–UIV for complexes 2, 3, and 4 respectively. The potassium cations in complexes 3 and 4 are coordinated to the siloxide ligands both in the solid state and in solution. The addition of KOTf (OTf=triflate) to the neutral compound 2 promotes its disproportionation to yield complexes 3 and 4 (depending on the stoichiometry) and the UIV mononuclear complex [U(OSi(OtBu)3)3(OTf)(thf)2] (5). This unprecedented reactivity demonstrates the key role of potassium for the stability of these complexes.
ChemInform Abstract: Zirconium Transition Metal (Poly)antimonides — Synthesis, Characterization and Electrochemical Properties.
Authors: Greiwe Magnus , Krause Maximilian , Osters Oliver , Dorantes Alma , Piana Michele , Nilges Tom 
Published: November 2013

AbstractZr2MSb3 (M: Cu, Pd) and Zr3MSb7 (M: Ni, Pd) are prepared by arc melting of the elements followed by annealing at 973 K in evacuated quartz tubes.
ChemInform Abstract: A Promising Mid‐Temperature Thermoelectric Material Candidate: Pb/Sn‐Codoped In4PbxSnySe3.
Authors: Lin Zhi‐Sheng , Chen Ling , Wang Li‐Min , Zhao Jing‐Tai , Wu Li‐Ming 
Published: November 2013

AbstractPb‐doped In4‐xPbxSe3 (x = 0.01—0.06) and Pb/Sn‐codoped In4Pb0.01SnySe3 (y = 0.03—0.05) are prepared by solid state reactions of the elements (1223 K, 1 d, annealing at 753 K for 5 d).
ChemInform Abstract: General Observation of Fe3+/Fe2+ Redox Couple Close to 4 V in Partially Substituted Li2FeP2O7 Pyrophosphate Solid‐Solution Cathodes.
Authors: Ye Tian , Barpanda Prabeer , Nishimura Shin‐ichi , Furuta Naoya , Chung Sai‐Cheong , Yamada Atsuo 
Published: November 2013

AbstractMixed‐metal Li2MxFe1‐xP2O7 (M: Mn, Co, Mg) cathode materials for lithium ion batteries with a monoclinic structure (space group P21/c) exhibit unusually high Fe3+/Fe2+ redox potentials close to 4.0 V vs Li/Li+.
ChemInform Abstract: Trilacunary Keggin‐Type POMs as Versatile Building Blocks for Lanthanoid Silicotungstates.
Authors: Ni Lubin , Spingler Bernhard , Weyeneth Stephen , Patzke Greta R. 
Published: November 2013

AbstractThe new compounds (IV), (V), (VII), and (IX) are characterized by single crystal XRD, IR, UV/VIS, and photoluminescence spectroscopy, and cyclic voltammetry.
ChemInform Abstract: Synthesis, Structure, and Tungsten NMR Characterization of {SbW9O33}9‐{Mo2O2 S2}2+ Sandwich‐Like Polyoxothiometalates.
Authors: Pilette Marie‐Anne , Floquet Sebastien , Marrot Jerome , Secheresse Francis , Cadot Emmanuel 
Published: November 2013

AbstractCompounds (V) and (VI) are characterized by single crystal XRD and 183W NMR spectroscopy.
ChemInform Abstract: Triphenylene‐Based Tris(N‐Heterocyclic Carbene) Ligand: Unexpected Catalytic Benefits.
Authors: Gonell Sergio , Poyatos Macarena , Peris Eduardo 
Published: November 2013

AbstractTriphenylene based D3h‐symmetric tris‐NHC‐carbene Pd‐ and Au‐complexes are developed as catalysts for the α‐arylation of propiophenone, Suzuki—Miyaura cross‐coupling, and hydroamination of phenylacetylene.
ChemInform Abstract: Validity of Inorganic Nanosheets as an Efficient Planar Substituent to Enhance the Enantioselectivity of Transition‐Metal‐Catalyzed Asymmetric Synthesis
Authors: Zhao Li‐Wei , Shi Hui‐Min , An Zhe , Wang Jiu‐Zhao , He Jing 
Published: November 2013

Abstracttheoretical and experimental study
ChemInform Abstract: Development of a Generic Activation Mode: Nucleophilic α‐Substitution of Ketones via Oxy‐Allyl Cations.
Authors: Vander Wal Mark N. , Dilger Andreew K. , MacMillan David W. C. 
Published: November 2013

AbstractA mild method for the generation of intermediary oxy‐allyl cations, allowing for nucleophilic α‐functionalization of ketones is developed.
ChemInform Abstract: In situ Generation of PhI+CF3 and Transition‐Metal‐Free Oxidative sp2 C—H Trifluoromethylation.
Authors: Xu Cong , Liu Jingxin , Ming Wenbo , Liu Yingjie , Liu Jun , Wang Mang , Liu Qun 
Published: November 2013

AbstractBy simple mixing of PhI(OAc)2, TmsCF3 and KF, a hypervalent iodine trifluoromethylating species is formed and directly applied in sp2 C—H trifluoromethylation reactions of ketene dithioacetals and indoles.
ChemInform Abstract: Palladium‐Catalyzed Regio‐, Diastereo‐, and Enantioselective Allylation of Nitroalkanes with Monosubstituted Allylic Substrates.
Authors: Yang Xiao‐Fei , Yu Wei‐Hua , Ding Chang‐Hua , Ding Qiu‐Ping , Wan Shi‐Li , Hou Xue‐Long , Dai Li‐Xin , Wang Pin‐Jie 
Published: November 2013

AbstractThe title reaction affords products with two adjacent chiral centers with excellent selectivities tolerating various substituents at the para, meta, or ortho positions of the phenyl group of allyl (I).
ChemInform Abstract: Efficient Asymmetric Transfer Hydrogenation of N‐Sulfonylimines on Water.
Authors: Wang Lei , Zhou Qi , Qu Chuanhua , Wang Qiwei , Cun Linfeng , Zhu Jin , Deng Jingen 
Published: November 2013

AbstractThe asymmetric transfer hydrogenation of a range of N‐sulfonyl ketimines is achieved with sodium formate and (R,R)‐Ts‐DPEN as the chiral ligand.
ChemInform Abstract: Target‐Oriented Synthesis: Miscellaneous Synthetic Routes to Access 1,4‐Enediones Through the Coupling of 1,3‐Dicarbonyl Compounds with Multiform Substrates.
Authors: Zhu Yan‐ping , Cai Qun , Gao Qing‐he , Jia Feng‐cheng , Liu Mei‐cai , Gao Meng , Wu An‐xin 
Published: November 2013

AbstractA facile synthesis of enediones is achieved via copper‐catalyzed coupling of 1,3‐dicarbonyl compounds with 2‐haloketones, 2‐hydroxyketones, or methylcarbinols.
ChemInform Abstract: Addressing Challenges in Palladium‐Catalyzed Cross‐Couplings of Aryl Mesylates: Monoarylation of Ketones and Primary Alkyl Amines.
Authors: Alsabeh Pamela G. , Stradiotto Mark 
Published: November 2013

AbstractFor the first time examples of enolate α‐arylation employing aryl mesylate coupling partners and amination of inexpensive phenol derivatives with primary aliphatic amines are developed.
ChemInform Abstract: Highly Stereoselective Olefin Cyclopropanation of Diazooxindoles Catalyzed by a C2‐Symmetric Spiroketal Bisphosphine/Au(I) Complex.
Authors: Cao Zhong‐Yan , Wang Xiaoming , Tan Chen , Zhao Xiao‐Li , Zhou Jian , Ding Kuiling 
Published: November 2013

AbstractThe reaction applies a wide range of alkenes, including cyclic, cis‐ and trans‐1,2‐disubstituted as well as 1,1‐disubstituted ones.
ChemInform Abstract: Desymmetrization of α‐Diimines: Synthesis of New 3‐(Diaziridin‐3‐yl)oxaziridines.
Authors: Aresu Emanuele , Carroccia Laura , Fioravanti Stefania , Pellacani Lucio 
Published: November 2013

AbstractThe synthesis of new heterocyclic compounds (V) characterized by the presence of a diaziridine and an oxaziridine ring directly bound is reported.
ChemInform Abstract: Rhodium‐Catalyzed C3‐Selective Alkenylation of Substituted Thiophene‐2‐carboxylic Acids and Related Compounds.
Authors: Iitsuka Tomonori , Schaal Petra , Hirano Koji , Satoh Tetsuya , Bolm Carsten , Miura Masahiro 
Published: November 2013

AbstractThis regioselective alkenylation affords a wide range of different alkenylated thiophene derivatives and gives also access to the corresponding alkenylated furans, benzofurans, and benzoic acids.
ChemInform Abstract: Synthesis of 2‐Aryl‐3‐trifluoromethylquinolines Using (E)‐Trimethyl(3,3,3‐trifluoroprop‐1‐enyl)silane.
Authors: Omote Masaaki , Tanaka Miyuu , Tanaka Miki , Ikeda Akari , Tarui Atsushi , Sato Kazuyuki , Ando Akira 
Published: November 2013

AbstractThe cyclocondensation reaction to yield quinolines (V) is only suitable for aromatic aldehydes (IV), but not aliphatic aldehydes.
ChemInform Abstract: Robust Cyclometallated Ir(III) Catalysts for the Homogeneous Hydrogenation of N‐Heterocycles under Mild Conditions.
Authors: Wu Jianjun , Barnard Jonathan H. , Zhang Yi , Talwar Dinesh , Robertson Craig M. , Xiao Jianliang 
Published: November 2013

AbstractThe highly selective reduction of a range of N‐heterocyclic compounds as well as imines under mild conditions is reported.
ChemInform Abstract: Iodination of Remote ortho‐C—H Bonds of Arenes via Directed SEAr: A Streamlined Synthesis of Tetrahydroquinolines.
Authors: Nack William A. , He Gang , Zhang Shu‐Yu , Lu Chengxi , Chen Gong 
Published: November 2013

AbstractCompounds (IV), (IX), and (XIV) contain small amounts of other iodinated products.
ChemInform Abstract: Palladium‐Catalyzed Oxidation of Amine in Air: An Efficient Approach to H‐Pyrazolo[5,1‐a]‐isoquinolines.
Authors: Sheng Jie , Guo Ying , Wu Jie 
Published: November 2013

AbstractEnamines prepared in situ by Pd‐catalyzed oxidation of amines in air react with substrates (I) to afford pyrazoloisoquinolines in a one‐pot fashion.
ChemInform Abstract: A Luminescent and Dichroic Hexagermane.
Authors: Roewe Kimberly D. , Rheingold Arnold L. , Weinert Charles S. 
Published: November 2013

AbstractThe preparation and structural characterization as well as studies of the optical properties of (iPr)3Ge—(GePh2)4—Ge (iPr)3 are presented.
ChemInform Abstract: Straightforward and Highly Diastereoselective Synthesis of 2,2‐Di‐Substituted Perhydrofuro[2,3‐b]pyran (and furan) Derivatives Promoted by BiCl3.
Authors: Ma Xiaofeng , Tang Qin , Ke Jun , Zhang Jichao , Wang Cong , Wang Haibo , Li Yuxue , Shao Huawu 
Published: November 2013

AbstractThe cyclization of cyclopropanated sugars, such as (I), with olefins, e.g. (II) proceeds highly diastereoselective to afford the title compounds (III).
Population balance model: Breakage kernel parameter estimation to emulsification data
Authors: Solsvik Jannike , Becker Per J. , Sheibat‐Othman Nida , Jakobsen Hugo A. 
Published: November 2013

AbstractMany processes used across, for example the cosmetics, pharmaceutical, food and chemical industries involve two‐phase liquid–liquid interactions. The quality of liquid–liquid emulsification systems may be related to the droplet size distribution. The population balance equation (PBE) can be used as a modelling tool when accurate description of the dispersed phase is required. Still, the key challenge with the formulation of predictive population balance (PB) models is experimental determination of unknown breakage and coalescence functions. The complexity in the processes and phenomena governing the changes of dispersed systems makes the derivation of the corresponding models a significant challenge.The present study considers a PBE optimisation problem to allow parameter identification to experimental data. The experimental data are measured for a breakage dominated liquid–liquid emulsification system in a stirred tank. Parameter identifications to the breakage frequency models proposed by Coulaloglou and Tavlarides,[26] Alopaeus et al.[28] and Baldyga and Podgorska[27] are performed. The PBE is numerically solved using the high‐order least‐squares method. Moreover, the nonlinear parameter identification algorithm is based on the minimisation of the residual between the experimental data and the numerical solution in a least‐squares sense. The problem has been implemented in the programming language MATLAB where the fmincon function has been used.Parameter estimation can sometimes be straight forward, for instance when the process and formulated model are relatively simple and sufficient data are available. These conditions are not always met, which may result in difficulties in determining accurate parameter values. A thorough statistical analysis is required in order to explore the actual accuracy of the estimated parameter values. The present study presents a relative comprehensive statistical study of the fit compared to what has been provided in previous PBE parameter estimation studies. Moreover, the optimisation algorithm and challenges associated with parameter estimation are discussed. The present study revealed, by systematically assessing the problem formulation and the fit, that a better understanding of the model and more successful parameter estimation can be achieved, or a limitation of the model is unveiled.