bluuebunny/crossref_metadata_2025_split huggingface dataset:
Recycling Powered by Release of Carbon Dioxide
Authors: Laurell Nash Anna , Widyan Khalid , Moberg Christina 
Published: November 2014

AbstractIn a cyclic process, fed with external chemical energy generated by the transformation of a compound with high chemical potential to carbon dioxide, the undesired enantiomer from a catalytic asymmetric reaction is continuously recycled to starting reagent. This minor enantiomer recycling is characterized by gradually increasing yields and product enantiomeric ratios. The requirements for maintaining a cyclic procedure are discussed; the necessity of a coupled exergonic process is demonstrated experimentally.
Freestanding Sulfur/3D Carbon Fiber Membrane Cathodes for Advanced Lithium–Sulfur Batteries
Authors: Chen Wei , Zhang Zhian , Li Qiang , Lai Yanqing , Li Jie 
Published: November 2014

AbstractA freestanding membrane of a 3D network of carbon fibers coated with nitrogen‐doped carbon spheres (NC@FCF) was designed through the carbonization of modified filter paper, on the surface of which polydopamine spheres were deposited. It is found that the NC@FCF membrane is composed of interlaced and circuitous carbon fibers, and the carbon spheres are distributed in the interspaces among carbon fibers. After infiltration with sulfur, the S‐NC@FCF membrane was directly used as a cathode for Li–S batteries. The freestanding cathode exhibits an excellent rate capability, large charge–discharge capacity, and outstanding cycle performance, exhibiting an initial discharge capacity of 1143.7 mAh g−1 and maintaining 778.2 mAh g−1 after 200 cycles at 0.5 C. The excellent electrochemical performance results from the synergistic effect of the 3D carbon‐fiber network, which provides electronic conduction pathways, and the porous structure formed through the accumulation of carbon spheres, which can encapsulate S, absorb polysulfides, and facilitate Li+ transfer.
Sulfur Encapsulated in a TiO2‐Anchored Hollow Carbon Nanofiber Hybrid Nanostructure for Lithium–Sulfur Batteries
Authors: Zhang Zhian , Li Qiang , Jiang Shaofeng , Zhang Kai , Lai Yanqing , Li Jie 
Published: November 2014

AbstractA hollow carbon nanofiber hybrid nanostructure anchored with titanium dioxide (HCNF@TiO2) was prepared as a matrix for effective trapping of sulfur and polysulfides as a cathode material for Li–S batteries. The synthesized composites were characterized and examined by X‐ray diffraction, nitrogen adsorption–desorption measurements, field‐emission scanning electron microscopy, scanning transmission electron microscopy, and electrochemical methods such as galvanostatic charge/discharge, rate performance, and electrochemical impedance spectroscopy tests. The obtained HCNF@TiO2–S composite showed a clear core–shell structure with TiO2 nanoparticles coating the surface of the HCNF and sulfur homogeneously distributed in the coating layer. The HCNF@TiO2–S composite exhibited much better electrochemical performance than the HCNF–S composite, which delivered an initial discharge capacity of 1040 mA h g−1 and maintained 650 mAh g−1 after 200 cycles at a 0.5 C rate. The improvements of electrochemical performances might be attributed to the unique hybrid nanostructure of HCNF@TiO2 and good dispersion of sulfur in the HCNF@TiO2–S composite.
Robust Ethylenedioxythiophene–Vinylene Oligomers from Fragile Thiophene–Vinylene Cores: Synthesis and Optical, Chemical and Electrochemical Properties of Multicharged Shapes
Authors: Mayorga Burrezo Paula , Pelado Beatriz , Ponce Ortiz Rocío , De la Cruz Pilar , López Navarrete Juan T. , Langa Fernando , Casado Juan 
Published: November 2014

AbstractOligomers of ethylendioxythiophene–vinylene have been prepared. Their optical, electrochemical and chemical properties have been studied in detail by absorption and emission spectroscopy as well as cyclic voltammetry, Raman techniques and spectroelectrochemistry complemented with quantum chemical calculations. A comparison with their non‐ethylendioxy and non‐vinylene parents has been done. The inclusion of the EDO plus the vinylene function generates more robust electronic ground states regarding the largely flexible thiophene–vinylene (n TV) oligomeric homologues. The redox features of the new compounds are also rich of oxidative processes arising as an interesting stabilising balance effect between the oxygen fragment in the EDO groups (mesomeric effect) and the linear π‐conjugated structure. The oxidised species have been characterised, which show the ability for the formation of mixed valence charge‐transfer complexes and π dimers of different oxidation states, in particular, in the electrochemical medium, resulting that the electrochemical response is accounted for a succession of aggregation and electron‐transfer steps. With this work, a full understanding of the optical and electronic properties of these new oligomers in the context of the oligomer approach has been proposed.
Ionic‐Radius‐Driven Selection of the Main‐Group‐Metal Cage for Intermetalloid Clusters [Ln@PbxBi14−x]q− and [Ln@PbyBi13−y]q− (x/q=7/4, 6/3; y/q=4/4, 3/3)
Authors: Ababei Rodica , Massa Werner , Weinert Bastian , Pollak Patrik , Xie Xiulan , Clérac Rodolphe , Weigend Florian , Dehnen Stefanie 
Published: November 2014

AbstractReactions of the binary, pseudo‐homoatomic Zintl anion (Pb2Bi2)2− with Ln(C5Me4H)3 (Ln=La, Ce, Nd, Gd, Sm, Tb) in the presence of [2.2.2]crypt in ethane‐1,2‐diamine/toluene yielded ten [K([2.2.2]crypt)]+ salts of lanthanide‐doped semimetal clusters with 13 or 14 surface atoms. Single‐crystal X‐ray diffraction and energy‐dispersive X‐ray spectroscopy indicated the presence of the anions [Ln@Pb6Bi8]3−, [Ln@Pb3Bi10]3−, [Ln@Pb7Bi7]4−, or [Ln@Pb4Bi9]4− in single or double salts; the latter showed various ratios of the components in the solid state. The anions are the first ternary intermetalloid clusters comprising only elements of the sixth period of the periodic table, namely, Pb, Bi and lanthanides. This study, which was complemented by ESI mass spectrometry and 139La NMR spectroscopy in solution, rationalizes a continuous development of the ratio of 13:14‐atom cages with the ionic radius of the embedded Ln3+ ion, which seems to select the most suitable cage type. Quantum chemical investigations helped to analyze this situation in more detail and to explain the observed subtle influence of the atomic radii. Magnetic measurements confirmed that the embedded Ln3+ ions keep their expected paramagnetic or diamagnetic nature.
Stepwise Strategy to Cyclometallated PtII Complexes with N‐Heterocyclic Carbene Ligands: A Luminescence Study on New β‐Diketonate Complexes
Authors: Fuertes Sara , García Hector , Perálvarez Mariano , Hertog Wim , Carreras Josep , Sicilia Violeta 
Published: November 2014

AbstractThe imidazolium salt 3‐methyl‐1‐(naphthalen‐2‐yl)‐1H‐imidazolium iodide (2) has been treated with silver(I) oxide and [{Pt(μ‐Cl)(η3‐2‐Me‐C3H4)}2] (η3‐2‐Me‐C3H4=η3‐2‐methylallyl) to give the intermediate N‐heterocyclic carbene complex [PtCl(η3‐2‐Me‐C3H4)(H$\widehat{CC}$*‐κC*)] (3) (H$\widehat{CC}$*‐κC*=3‐methyl‐1‐(naphthalen‐2‐yl)‐1H‐imidazol‐2‐ylidene). Compound 3 undergoes regiospecific cyclometallation at the naphthyl ring of the NHC ligand to give the five‐membered platinacycle compound [{Pt(μ‐Cl)($\widehat{CC}$*)}2] (4). Chlorine abstraction from 4 with β‐diketonate Tl derivatives rendered the corresponding neutral compounds [Pt($\widehat{CC}$*)(L‐O,O′)] {L=acac (HL=acetylacetone) 5, phacac (HL=1,3‐diphenyl‐1,3‐propanedione) 6, hfacac (HL=hexafluoroacetylacetone) 7}. All of the compounds (3–7) were fully characterized by standard spectroscopic and analytical methods. X‐ray diffraction studies were performed on 5–7, revealing short PtPt and π–π interactions in the solid‐state structure. The influence of the R‐substituents of the β‐diketonate ligand on the photophysical properties and the use of the most efficient emitter, 5, as phosphor converter has also been studied.
Multicomponent Self‐Assembly with a Shape‐Persistent N‐Heterotriangulene Macrocycle on Au(111)
Authors: Cui Kang , Schlütter Florian , Ivasenko Oleksandr , Kivala Milan , Schwab Matthias G. , Lee Shern‐Long , Mertens Stijn F. L. , Tahara Kazukuni , Tobe Yoshito , Müllen Klaus , Mali Kunal S. , De Feyter Steven 
Published: November 2014

AbstractMulticomponent network formation by using a shape‐persistent macrocycle (MC6) at the interface between an organic liquid and Au(111) surface is demonstrated. MC6 serves as a versatile building block that can be coadsorbed with a variety of organic molecules based on different types of noncovalent interactions at the liquid–solid interface. Scanning tunneling microscopy (STM) reveals the formation of crystalline bicomponent networks upon codeposition of MC6 with aromatic molecules, such as fullerene (C60) and coronene. Tetracyanoquinodimethane, on the other hand, was found to induce disorder into the MC6 networks by adsorbing on the rim of the macrocycle. Immobilization of MC6 itself was studied in two different noncovalently assembled host networks. MC6 assumed a rather passive role as a guest and simply occupied the host cavities in one network, whereas it induced a structural transition in the other. Finally, the central cavity of MC6 was used to capture C60 in a complex three‐component system. Precise immobilization of organic molecules at discrete locations within multicomponent networks, as demonstrated here, constitutes an important step towards bottom‐up fabrication of functional surface‐based nanostructures.
Iridium Catalyzed Carbocyclizations: Efficient (5+2) Cycloadditions of Vinylcyclopropanes and Alkynes
Authors: Melcher Michaela‐Christina , von Wachenfeldt Henrik , Sundin Anders , Strand Daniel 
Published: November 2014

AbstractThird‐row transition metal catalysts remain a largely untapped resource in cycloaddition reactions for the formation of medium‐sized rings. Herein, we report the first examples of iridium‐catalyzed inter‐ and intramolecular vinylcyclopropane (VCP)–alkyne (5+2) cycloadditions. DFT modeling suggests that catalysis by iridium(I) proceeds through a mechanism similar to that previously reported for rhodium(I)‐catalyzed VCP–alkyne cycloadditions, but a smaller free energy span for iridium enables substantially faster catalysis under favorable conditions. The system is characterized by up to quantitative yields and is amenable to an array of disubstituted alkynes and vinylcyclopropanes.
Oxidative Addition at a Carbene Center: Synthesis of an Iminoboryl–CAAC Adduct
Authors: Dahcheh Fatme , Stephan Douglas W. , Bertrand Guy 
Published: November 2014

AbstractThe reaction of a cyclic (alkyl)(amino)carbene (CAAC) with dichloro‐ and dibromobis(trimethylsilyl)aminoborane results in the formation of haloiminoborane–CAAC adducts. When the iodo analogue is used, an oxidative addition at the carbene center affords a cationic iminoboryl–CAAC adduct, featuring a boron–nitrogen triple bond. Similar salts are also obtained by halide abstraction from the chloro‐ and bromoiminoborane–CAAC adducts. The reactivity of all of these compounds towards CO2 is discussed.
ChemInform Abstract: Solvent‐Free Synthesis of a Secondary N‐Benzhydrylamine as a Chiral Reagent for Asymmetric Deprotonation of Bicyclic N‐Benzylamino Ketones.
Authors: Nodzewska Aneta , Sidorowicz Katarzyna , Sienkiewicz Michal 
Published: November 2014

Abstract(R)‐N‐benzhydryl‐1‐phenylethylamine is utilized as chiral auxiliary in asymmetric deprotonations of N‐benzyl analogues of tropinone and granatanone.
ChemInform Abstract: Palladium‐Catalyzed Carbonylation of Aryl Bromides with N‐Substituted Cyanamides
Authors: Lian Zhong , Friis Stig D. , Lindhardt Anders T. , Skrydstrup Troels 
Published: November 2014

AbstractThe carbonylation is performed using a slight excess of CO‐gas which is produced ex situ from (II) in a two‐chamber reaction system.
ChemInform Abstract: Highly Efficient Deoxygenation of Sulfoxides Using Hydroxyapatite‐Supported Ruthenium Nanoparticles.
Authors: Takahashi Yusuke , Mitsudome Takato , Mizugaki Tomoo , Jitsukawa Koichiro , Kaneda Kiyotomi 
Published: November 2014

AbstractThe catalyst can be recycled and is reused without loss of activity.
ChemInform Abstract: One‐Pot Synthesis of Novel Heterocyclic Compounds via Tandem Reactions.
Authors: Huq C. A. M. A. , Sivakumar S. 
Published: November 2014

AbstractThe title compounds (III), (V), (VII) are obtained by a tandem oxy‐Cope rearrangement/SN displacement reaction, a tandem dianionic oxy‐Cope rearrangement/nucleophilic substitution at carbonyl carbon, and a tandem anionic oxy‐Cope rearrangement/transannular reaction, respectively.
ChemInform Abstract: Covalently Anchored Carboxylic Acid on Uniform Spherical Silica Nanoparticles with Narrow Slit Like Mesopores for the Synthesis of Pyrroloacridinones: CuI‐Catalyzed Further C(sp3)—H Oxyfunctionalization for C=O Formation.
Authors: Ray Suman , Bhaumik Asim , Pramanik Malay , Mukhopadhyay Chhanda 
Published: November 2014

AbstractThe catalyst can be reused at least six times with only slight decreases in yield.
ChemInform Abstract: Zeolite‐Catalyzed Method for the Preparation of 2,3‐Dihydroquinazolin‐4(1H)‐ones.
Authors: Takacs Anna , Fodor Anna , Nemeth Janos , Hell Zoltan 
Published: November 2014

AbstractTitle compounds are prepared by the reaction of isatoic anhydride, amines and aromatic aldehydes.
ChemInform Abstract: Access to Novel Imidazo[1,5‐a]pyrazine Scaffolds by the Combined Use of a Three‐Component Reaction and a Base‐Assisted Intramolecular Cyclization.
Authors: Attanasi Orazio A. , Favi Gianfranco , Giorgi Gianluca , Majer Roberta , Perrulli Francesca Romana , Santeusanio Stefania 
Published: November 2014

AbstractApplication of aliphatic isothiocyanates other than (XX) fails.
ChemInform Abstract: Palladium‐Catalyzed Cross‐Coupling of 5‐Acyl and 5‐Formyl‐1,2,4‐triazines and Their Derivatives with Heteroaromatic Tin Compounds.
Authors: Branowska Danuta , Olender Ewa , Rykowski Andrzej 
Published: November 2014

AbstractThe title process is investigated in detail under conditions A) and B).
ChemInform Abstract: Intermolecular and Regioselective Access to Polysubstituted Benzo‐ and Dihydrobenzo[c]azepine Derivatives: Modulating the Reactivity of Group 6 Non‐Heteroatom‐Stabilized Alkynyl Carbene Complexes.
Authors: Gonzalez Jairo , Gomez Aranzazu , Funes‐Ardoiz Ignacio , Santamaria Javier , Sampedro Diego 
Published: November 2014

AbstractA three‐component reaction of Fischer carbene complexes (I), lithium acetylides and benzaldehyde imines offers an efficient approach to stable tungsten containing benzazepinium zwitterions.
ChemInform Abstract: Total Synthesis of Biselyngbyolide A.
Authors: Tanabe Yurika , Sato Eisuke , Nakajima Naoya , Ohkubo Akifumi , Ohno Osamu , Suenaga Kiyotake 
Published: November 2014

AbstractStarting from a known chiral aldehyde, the first total synthesis of biselyngbyolide A (I) succeeds in 16 steps with an overall yield of 2.1%.
Modélisation par homogénéisation d'une colonne d'absorption réactive
Authors: Girard Coralie , Couture Frédéric , Reneaume Jean‐Michel , Cezac Pierre 
Published: November 2014

RESUMELe garnissage d'une colonne d'absorption réactive est assimilé à un milieu poreux. Ainsi la modélisation des phénomènes de transports réactifs est basée sur une méthode d'homogénéisation par prise de moyenne volumique, technique originale pour le domaine. Le modèle est appliqué à l'absorption du dioxyde de carbone (CO2) dans une solution aqueuse d'hydroxyde de sodium (NaOH). Dans ce cas, les réactions sont supposées instantanément équilibrées. Les simulations instationnaires fournissent des informations locales sur le procédé tel que les champs de vitesse, de pression, de concentration et de température au sein du milieu.
Bladder cancer collaborative stage variables and their data quality, usage, and clinical implications: A review of SEER data, 2004‐2010
Authors: Charlton Mary E. , Adamo Margaret (Peggy) , Sun Leon , Deorah Sundeep 
Published: November 2014

BACKGROUNDSeveral changes were made to bladder cancer staging guidelines between the 6th and 7th editions of the American Joint Committee on Cancer (AJCC) Staging Manual. Also, Collaborative Stage (CS) Data Collection System version 2 (CSv2) implemented for 2010 Surveillance, Epidemiology, and End Results (SEER) cases involved collection of 3 new site‐specific factors (SSFs): World Health Organization/International Society of Urological pathology grade (SSF1), size of metastasis in regional lymph nodes (SSF2), and extranodal extension (SSF3). Our objective was to evaluate these new SSFs to assist researchers in their use/interpretation and to describe data quality issues to be addressed moving forward.METHODSStaging trends were assessed for invasive and noninvasive bladder cancer cases from 2004 to 2010. Among 2010 cases, staging was compared using the AJCC 6th and 7th edition guidelines, and evaluation of completeness/quality of the SSFs was performed in relevant subgroups.RESULTSAge‐adjusted incidence rates and proportions of cases by stage remained steady from 2004 to 2010. Changes from the AJCC 6th to 7th editions caused no substantial movement between stages. SSF1 had a known value in 82% of cases, which was higher than the traditional SEER grade/differentiation variable. SSF2 and SSF3 were less complete, with 41% and 37% having known values, respectively, among cases with lymph node involvement (according to CS lymph node variable).CONCLUSIONSSSF1 was more complete and straightforward to interpret than the traditional grade/differentiation variable. SSF2 and SSF3 were less complete, may be associated with data quality issues, and should only be used among cases with known lymph node involvement Cancer 2014;120(23 suppl):3815‐25. © 2014 American Cancer Society.
Site‐specific factors for cancer of the corpus uteri from SEER registries: Collaborative stage data collection system, version 1 and version 2
Authors: Jamison Patricia M. , Altekruse Sean F. , Chang Joanne T. , Zahn Jennifer , Lee Richard , Noone Anne‐Michelle , Barroilhet Lisa 
Published: November 2014

BACKGROUNDUterine cancer is the fourth leading cancer among US women. Changes in uterine cancer staging were made from the American Joint Committee on Cancer (AJCC) 6th to 7th edition staging manuals, and 8 site‐specific factors (SSFs) and 3 histologic schemas were introduced. Carcinomas account for 95% of cases and are the focus of this report.METHODSDistributions of SSF values were examined for 11,601 cases of malignant cancer of the corpus uteri and uterus, NOS (not otherwise specified) diagnosed in Surveillance, Epidemiology, and End Results (SEER) Program registries during 2010. AJCC 6th and 7th edition staging distributions were compared for 11,176 cases using data in both staging systems. AJCC 6th edition staging distributions during 2004‐2010 were examined. AJCC 7th edition SSFs required by SEER were International Federation of Gynecology and Obstetrics stage (SSF1), peritoneal cytology (SSF2), number of positive pelvic lymph nodes (SSF3), number of pelvic lymph nodes examined (SSF4), number of positive para‐aortic lymph nodes (SSF5), and number of para‐aortic lymph nodes examined (SSF6).RESULTSFor SSFs related to lymph nodes, a third of cases were classified as “not applicable,” reflecting that lymph node dissection is not indicated for cases with stage1A and stage 4 diagnoses. AJCC 7th edition criteria assigned more cases to stage I (72.9%) than AJCC 6th edition criteria (68.7%). Annual counts significantly increased during 2004‐2010, as did counts for AJCC 6th edition stages INOS, IA, IB, IC, IIIA, IIIB, IIIC, and IVB. The proportion of cases diagnosed with stage I cancer was stable, whereas stages II and IV decreased and stage III increased.CONCLUSIONSFive SSFs were suitable for analysis: peritoneal cytology results (SSF2), numbers of positive pelvic lymph nodes (SSF3), pelvic lymph nodes examined (SSF4), positive para‐aortic lymph nodes (SSF5), and para‐aortic lymph nodes examined (SSF6). Cancer 2014;120(23 suppl):3836‐45. © 2014 American Cancer Society.
Impact of biochemical failure classification on clinical outcome: A secondary analysis ofRadiationTherapyOncologyGroup 9202 and 9413
Authors: Hamstra Daniel A. , Bae Kyounghwa , Hanks Gerald , Hu Chen , Shipley William U. , Pan Charlie C. , Roach Mack , Lawton Colleen A. , Sandler Howard M. 
Published: November 2014

BACKGROUNDBiochemical failure (BF) after radiation therapy is defined on the basis of a rising prostate‐specific antigen (PSA) level (A1 failure) or any event that prompts the initiation of salvage androgen‐deprivation therapy without PSA failure (A2). It was hypothesized that A2 failure may have a different prognosis.METHODSData for 2799 eligible patients from Radiation Therapy Oncology Group (RTOG) 9202 and RTOG 9413 were analyzed. BF was defined according to the 1997 American Society for Therapeutic Radiology and Oncology consensus definition as A1 for PSA failure or as A2 for the start of salvage hormone therapy before 3 consecutive PSA rises.RESULTSRates of all‐cause mortality (hazard ratio [HR], 1.7; 95% confidence interval [CI], 1.5‐2.0;P < .0001) and distant metastasis (DM; HR, 1.6; 95% CI, 1.3‐2.0;P < .0001) were greater with A2 failure. The 5‐year overall survival (OS) rates were 88.2% and 74.6% for A1 and A2, respectively (P < .0001), and the DM rates were 15.7% and 29.0%, respectively (P < .0001). The DM rate was greater at 5 years for A2 patients with DM as the first sign of failure versus patients with other A2 failures (87.3% vs 11.7%,P < .001), and this also correlated with worse OS at 5 years: 81.1% for A2 failure without DM and 52.8% with DM (P < .001). After the removal of patients with DM, the difference between A1 and A2 BF persisted for OS (P = .002) but not for DM (P = .16)CONCLUSIONSThese results suggest that patients with rising PSA levels alone have less risk than those with A2 failures; although DM was the largest contributor of adverse risk to A2 failure, it did not account for all excess risk in A2 failure.Cancer2015;121:844–852.©2014 American Cancer Society.
A comprehensive DCF performance analysis in noisy industrial wireless networks
Authors: Maadani Mohsen , Motamedi Seyed Ahmad 
Published: November 2014

SummaryThe use of wireless technology in industrial networks is becoming more popular because of its flexibility, reduction of cable cost, and deployment time. Providing an accurate model to study the most important parameters of these networks, the timeliness and reliability, is essential in assessing the network metrics and choosing proper protocol settings. The Institute of Electrical and Electronics Engineers (IEEE) 802.11 is a common and established wireless technology, and several analytical models have been proposed to assess its performance; however, most of them are accurate only for a limited network situation, especially data networks that have large packet payloads and are used at high signal to noise ratios, and cannot be applied to study the performance of industrial networks that have short packet lengths and are used in harsh and noisy environments. In this paper, a novel three‐dimensional discrete‐time Markov chain model has been proposed for the IEEE 802.11‐based industrial wireless networks using the distributed coordination function as the medium access control mechanism in the worst‐case saturated traffic. It considers both causes of the backoff freezing: busy channel and the successive interframe space waiting time. In this way, it provides a much more accurate estimation of the channel access and error probabilities, resulting in a more accurate network parameter calculation. Also, based on the proposed model, a comprehensive packet delay analysis, including average, jitter, and cumulative distribution function, has been provided for the near 100% reliable industrial scenario and error‐prone channel condition, which in comparison with similar pieces of work provides much more accurate results. Copyright © 2014 John Wiley & Sons, Ltd.