bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Metal‐Free Radical Perfluoroalkylation of (Hetero)arenes.
Authors: Zhong Sabilla , Hafner Andreas , Hussal Christoph , Nieger Martin , Braese Stefan 
Published: June 2015

AbstractInexpensive and commercially available perfluorocarboxylic anhydrides are used as source of perfluoroalkyl radicals for the perfluoroalkylation of various arenes, such as benzene derivatives, furans, thiophenes, and pyrroles.
ChemInform Abstract: Microwave‐Promoted Solventless Mizoroki—Heck Reactions Catalyzed by Pd Nanoparticles Supported on Laponite Clay.
Authors: Martinez Alejandro V. , Invernizzi Fabio , Leal‐Duaso Alejandro , Mayoral Jose A. , Garcia Jose I. 
Published: June 2015

AbstractIt is found that the best conditions for this solventless Heck reaction are microwave irradiation in combination with an ionic liquid.
ChemInform Abstract: Aryltriolborates as Air‐ and Water‐Stable Bases for Wittig Olefination.
Authors: Huang Wenhua , Zhao Shuang‐Hong , Xu Ning 
Published: June 2015

AbstractAryltriolborates (ATB) and (PTB) are successfully employed for Wittig reactions of aromatic aldehydes with stabilized, semistabilized, and nonstabilized phosphorous ylides.
ChemInform Abstract: Effective, Transition Metal Free and Selective C—F Activation under Mild Conditions.
Authors: Kong Xianqiang , Zhang Huizi , Xiao Yunqing , Cao Changsheng , Shi Yanhui , Pang Guangsheng 
Published: June 2015

AbstractA simple and efficient substitution approach for the amination of various fluoroarenes with anilines is developed.
ChemInform Abstract: Microwave‐Assisted Synthesis of ortho‐Substituted Diaryl N‐(tert‐Butylsulfinyl)ketimines.
Authors: Qin Jianfeng , Huang Liliang , Cao Yong , Sun Zhihua 
Published: June 2015

Abstractvia condensation of ortho‐substituted diaryl ketones (I) with (R)‐(+)‐tert‐butylsulfinamide
ChemInform Abstract: Palladium‐Catalyzed α‐Arylation of Aryl Acetic Acid Derivatives via Dienolate Intermediates with Aryl Chlorides and Bromides.
Authors: Sha Sheng‐Chun , Zhang Jiadi , Walsh Patrick J. 
Published: June 2015

AbstractThe scalable reaction is not applicable to arylhalogenides containing ketone, ester, or amide groups.
ChemInform Abstract: Stereospecific and Stereoselective Rhodium(I)‐Catalyzed Intramolecular [2 + 2 + 2] Cycloaddition of Allene‐Ene‐Ynes: Construction of Bicyclo[4.1.0]heptenes.
Authors: Ohta Yuu , Yasuda Shigeo , Yokogawa Yuka , Kurokawa Kei , Mukai Chisato 
Published: June 2015

AbstractA novel Rh(I)‐catalyzed intramolecular [2 + 2 +2] cycloaddition of allene‐ene‐ynes yields cyclopropane‐fused polycyclic products.
ChemInform Abstract: Grinding‐Induced Synthesis of Heterocyclic Fullerene Derivatives under Solvent‐Free Conditions.
Authors: Safaei‐Ghomi Javad , Masoomi Reihaneh 
Published: June 2015

AbstractA green, easy, and effective solvent‐free procedure for the synthesis of heterocyclic fullerene derivatives is achieved via 1,3‐dipolar cycloaddition reaction of C60, substituted arylhydrazones/oximes, and PhI(OAc)2 under grinding as a simple physical‐mechanical method.
ChemInform Abstract: Alternative One‐Pot Synthesis of (Trifluoromethyl)phenyldiazirines from Tosyloxime Derivatives: Application for New Synthesis of Optically Pure Diazirinylphenylalanines for Photoaffinity Labeling.
Authors: Wang Lei , Murai Yuta , Yoshida Takuma , Ishida Akiko , Masuda Katsuyoshi , Sakihama Yasuko , Hashidoko Yasuyuki , Hatanaka Yasumaru , Hashimoto Makoto 
Published: June 2015

AbstractDiazirines (II) are formed from tosyloxime derivatives (I) via the deprotonation of intermediate diaziridine by NH2‐ generated from liquid NH3.
ChemInform Abstract: First Efficient Synthesis of SF5‐Substituted Pyrrolidines Using 1,3‐Dipolar Cycloaddition of Azomethine Ylides with Pentafluorosulfanyl‐Substituted Acrylic Esters and Amides.
Authors: Falkowska Ewelina , Tognetti Vincent , Joubert Laurent , Jubault Philippe , Bouillon Jean‐Philippe , Pannecoucke Xavier 
Published: June 2015

AbstractA single step procedure for the efficient synthesis of di‐, tri‐, and tetrasubstituted pentafluorosulfanylated pyrrolidines is developed.
ChemInform Abstract: Deep Eutectic Solvent Based on Choline Chloride and Malonic Acid as an Efficient and Reusable Catalytic System for One‐Pot Synthesis of Functionalized Pyrroles.
Authors: Hu Hai‐Chuan , Liu Yu‐Heng , Li Bao‐Le , Cui Zhen‐Shui , Zhang Zhan‐Hui 
Published: June 2015

AbstractA deep eutectic solvent based on choline chloride and malonic acid is used as a dual catalyst and green reaction medium for the synthesis of a wide range of functionalized pyrroles by four‐component reaction of various amines, aldehydes, 1,3‐dicarbonyl compounds, and nitromethane.
ChemInform Abstract: Merging C—H Activation and Alkene Difunctionalization at Room Temperature: A Palladium‐Catalyzed Divergent Synthesis of Indoles and Indolines.
Authors: Manna Manash Kumar , Hossian Asik , Jana Ranjan 
Published: June 2015

AbstractThe Pd‐catalyzed reaction of aryl ureas with vinyl arenes provides indole or indoline derivatives.
ChemInform Abstract: Electrochemical Intramolecular C—H Amination: Synthesis of Benzoxazoles and Benzothiazoles.
Authors: Morofuji Tatsuya , Shimizu Akihiro , Yoshida Jun‐ichi 
Published: June 2015

Abstract2‐Pyrimidyloxybenzenes and their thio analogues are subjected to anodic oxidation in a H‐type divided cell under constant current.
ChemInform Abstract: Base‐Catalyzed One‐Step Synthesis of 5,7‐Disubstituted‐1,2,4‐triazolo[1,5‐a]pyrimidines.
Authors: He Xinhua , Kassab Shaymaa E. , Heinzl Geoffrey , Xue Fengtian 
Published: June 2015

AbstractBase‐mediated cyclocondensation of chalcones and triazol‐3‐amines produces triazolopyrimidines.
ChemInform Abstract: Efficient Synthesis of 5‐Chalcogenyl‐1,3‐oxazin‐2‐ones by Chalcogen‐Mediated Yne‐Carbamate Cyclization: An Experimental and Theoretical Study.
Authors: Monleon Alicia , Blay Gonzalo , Domingo Luis R. , Munoz M. Carmen , Pedro Jose R. 
Published: June 2015

AbstractA series of 5‐chalcogenyl‐1,3‐oxazin‐2‐ones are synthesized by 6‐endo‐dig cyclization of chiral N‐Cbz‐protected propargylic amines.
ChemInform Abstract: M2+ and Ln3+‐Catalyzed Synthesis of a [1,2,4]Triazine Core via Intramolecular C—H/N—H Functionalization and C—N Bond Formation (M: Mn, Zn, Cd; Ln: Dy, Tb).
Authors: Chen Wen‐Bin , Li Zhi‐Xin , Yu Xin‐Wei , Yang Meng , Qiu Yan‐Xuan , Dong Wen 
Published: June 2015

AbstractA new approach to the direct construction of the 1,2,4‐triazine core starting from eight azo‐conjugated aromatic compounds via transition or lanthanide metal‐catalyzed cross‐dehydrogenative coupling reactions under hydrothermal conditions is reported.
ChemInform Abstract: A Versatile Synthesis of β‐Lactam‐Fused Oxacycles Through the Palladium‐Catalyzed Chemo‐, Regio‐, and Diastereoselective Cyclization of Allenic Diols.
Authors: Alcaide Benito , Almendros Pedro , Carrascosa Rocio , Casarrubios Luis , Soriano Elena 
Published: June 2015

Abstractβ‐Lactam‐fused morpholine, oxocines and dioxonines are formed chemo‐ and regioselectively from allenic diols by palladium catalysis.
ChemInform Abstract: Enantioselective Synthesis of α‐Aminosilanes by Copper‐Catalyzed Hydroamination of Vinylsilanes.
Authors: Niljianskul Nootaree , Zhu Shaolin , Buchwald Stephen L. 
Published: June 2015

AbstractThe Cu‐catalyzed hydrosilylation of vinylsilanes is developed using (Rax)‐DTBM‐SEGPHOS as chiral source.
ChemInform Abstract: Nickel Catalyzed Dealkoxylative C(sp2)—C(sp3) Cross Coupling Reactions — Stereospecific Synthesis of Allylsilanes from Enol Ethers.
Authors: Guo Lin , Leiendecker Matthias , Hsiao Chien‐Chi , Baumann Christoph , Rueping Magnus 
Published: June 2015

AbstractThe title reaction proceeds regio‐ and stereoselectively preserving the given configuration.
ChemInform Abstract: Regioselective Benzoylation of 4,6‐O‐Benzylidene Acetals of Glycopyranosides in the Presence of Transition Metals.
Authors: Evtushenko Evgeny V. 
Published: June 2015

AbstractThe benzoylation of 4,6‐O‐benzylidene acetals of α‐D‐glucopyranosides and α‐D‐mannopyranosides with benzoic anhydride in the presence of (F3C‐COO)2Cu gives 2‐benzoates in good yields with high regioselectivity.
ChemInform Abstract: Tiliabisflavan A, a New Flavan‐3‐ol Dimer from Tilia amurensis with Cytotoxic and Antiinflammatory Effects.
Authors: Kim Ki Hyun , Moon Eunjung , Kim Sun Yeon , Choi Sang Un , Lee Kang Ro 
Published: June 2015

AbstractNew flavan‐3‐ol dimer, tiliabisflavin A (I) is isolated together with three known flavan‐3‐ols.
Real‐time image reconstruction for pulse EPR oxygen imaging using a GPU and lookup table parameter fitting
Authors: Redler Gage , Qiao Zhiwei , Epel Boris , Halpern Howard J. 
Published: June 2015

ABSTRACTThe importance of tissue oxygenation has led to a great interest in methods for imaging pO2 in vivo. Electron paramagnetic resonance imaging (EPRI) provides noninvasive, near absolute 1 mm‐resolved 3D images of pO2 in the tissues and tumors of living animals. Current EPRI image reconstruction methods tend to be time consuming and preclude real‐time visualization of information. Methods are presented to significantly accelerate the reconstruction process in order to enable real‐time reconstruction of EPRI pO2 images. These methods are image reconstruction using graphics processing unit (GPU)‐based 3D filtered back‐projection and lookup table parameter fitting. The combination of these methods leads to acceleration factors of over 650 compared to current methods and allows for real‐time reconstruction of EPRI images of pO2 in vivo. © 2015 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 45B: 46–57, 2015
A fast and simple method for calibrating the flip angle in hyperpolarized 13C MRS experiments
Authors: Giovannetti Giulio , Frijia Francesca , Flori Alessandra , De Marchi Daniele , Aquaro Giovanni Donato , Menichetti Luca , Ardenkjaer‐Larsen Jan Henrik 
Published: June 2015

ABSTRACTHyperpolarized 13C Magnetic resonance represents a promising modality for in vivo studies of intermediary metabolism of bio‐molecules and new biomarkers. Although it represents a powerful tool for metabolites spatial localization and for the assessment of their kinetics in vivo, a number of technological problems still limits this technology and needs innovative solutions. In particular, the optimization of the signal‐to‐noise ratio during the acquisitions requires the use of pulse sequences with accurate flip angle calibration, which is performed by adjusting the transmit power in the prescan step. This is even more critical in the case of hyperpolarized studies, because the fast decay of the hyperpolarized signal requires precise determination of the flip angle for the acquisition. This work describes a fast and efficient procedure for transmit power calibration of magnetic resonance acquisitions employing selective pulses, starting from the calibration of acquisitions performed with non‐selective (hard) pulses. The proposed procedure employs a simple theoretical analysis of radiofrequency pulses by assuming a linear response and can be performed directly during in vivo studies. Experimental MR data validate the theoretical calculation by providing good agreement. © 2015 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 45B: 78–84, 2015
Platinum(II)‐Coordinated Pyridine‐Functionalized Single‐Wall Carbon Nanotubes and Electron Transport in Their Films
Authors: Jombert Alice S. , Bayazit Mustafa K. , Coleman Karl S. , Zeze Dagou A. 
Published: June 2015

AbstractCarbon nanotubes (CNTs) are ideal support materials for platinum in fuel cells. However, little is known about the conduction mechanism of Pt‐coordinated CNTs. Herein, a coordination complex of pyridine‐functionalized single‐walled nanotubes (Py‐SWNTs) with Pt (Pt/Py‐SWNTs) was prepared via the ligand exchange reaction between cis‐[Pt(dmso)2Cl2] and Py‐SWNTs generated by pyridine diazonium salt addition to SWNTs. The presence of Pt in modified SWNTs was confirmed by X‐ray photoelectron spectroscopy (XPS). The N 1s XPS spectra provided evidence of Pt coordination to the pyridine nitrogen atom. Modified SWNTs were further characterized by thermogravimetric analysis coupled with mass spectrometry, ultraviolet‐visible‐near infrared spectroscopy, Raman spectroscopy, and elemental analysis. The electron conduction mechanism of Pt/Py‐SWNT films was best described by a modified quantum tunneling model, identified from a combined analysis of the voltage and temperature dependence of the current.
Dissipative Euler Flows with Onsager‐Critical Spatial Regularity
Authors: Buckmaster Tristan , De Lellis Camillo , Székelyhidi László 
Published: June 2015

AbstractFor any ɛ > 0 we show the existence of continuous periodic weak solutions v of the Euler equations that do not conserve the kinetic energy and belong to the space ; namely, x ↦ v (x,t) is ⅓−ε‐Hölder continuous in space at a.e. time t and the integral is finite. A well‐known open conjecture of L. Onsager claims that such solutions exist even in the class .© 2016 Wiley Periodicals, Inc.
Cooperative beamforming of full‐duplex relays for improving physical layer security
Authors: Lee Jong‐Ho 
Published: June 2015

SummaryIn this paper, we consider secure communications of one source‐destination pair in the presence of one eavesdropper, when full‐duplex decode‐and‐forward cooperative relays operate to enhance physical layer security. While the conventional half‐duplex relay receives the signal from the source and forwards the re‐encoded signal to the destination in two separated time slots, the full‐duplex relay (FDR) performs the transmission and reception at the same time, which can ideally double the secrecy capacity. However, because of the simultaneous transmission and reception, each FDR suffers from both its own self‐interference and the interference from the other cooperative FDRs. When the conventional cooperative relaying schemes are used in full‐duplex relaying, it is obviously expected that the self‐interference signals cause severe degradation of the secrecy capacity. Here, we propose an iterative transmit power allocation and relay beamforming weight design scheme for cooperative FDRs to enhance the secrecy rate as well as suppress the self‐interference signals. Numerical results present that the FDRs with the proposed scheme significantly improve the secrecy rate compared with the conventional half‐duplex relays. Copyright © 2015 John Wiley & Sons, Ltd.
Anaemia in patients with aortic stenosis: influence on long‐term prognosis
Authors: Ng Arnold C.T. , Kong William K. F. , Kamperidis Vasileios , Bertini Matteo , Antoni M. Louisa , Leung Dominic Y. , Marsan Nina Ajmone , Delgado Victoria , Bax Jeroen J. 
Published: June 2015

AimsThe prognostic implications of anaemia in patients with aortic stenosis (AS) remain unclear. Accordingly, the present study aimed to evaluate the prognostic implications of anaemia inASpatients before and after aortic valve replacement (AVR).Methods and resultsA total of 856ASpatients (age 71 ± 12 years, 60.2% male, 47.4% severeAS) were included. The mean haemoglobin (Hb) level was 13.2 ± 1.8 g/dL, and the prevalence of anaemia (Hb <13.0 g/dLfor men, <12.0 g/dLfor women) was 32.0%. The prevalence of anaemia rose with increasing severity ofAS(28.9% and 35.6% in moderate and severeAS, respectively,P= 0.048) and was independently associated with increased all‐cause mortality in severeASpatients whilst under medical therapy [hazard ratio (HR) 2.26, 95% confidence interval (CI) 1.29–3.97,P= 0.005). Similarly, each 1.0 g/dLdecrease in Hb was independently associated with increased mortality risk at follow‐up (HR1.35, 95%CI1.07–1.47,P= 0.006). However, afterAVRsurgery, severeASpatients who had anaemia had similar long‐term survival as patients with normal Hb (log rankP= 0.19). When allASpatients were included andAVRsurgery entered as a covariate, anaemia was still independently associated with increased all‐cause mortality irrespective of the severity ofAS.ConclusionsA high prevalence of anaemia in moderate and severeASpatients was observed, and its presence was independently associated with increased all‐cause mortality. However, afterAVRsurgery, anaemic patients had similar survival rates as patients with normal Hb.
Cyclization of Diaryl(hetaryl)alkynes under Selenobromination Conditions: Regioselectivity and Mechanistic Studies
Authors: Paegle Edgars , Belyakov Sergey , Petrova Marina , Liepinsh Edvards , Arsenyan Pavel 
Published: June 2015

AbstractThe cyclization of substituted diaryl(hetaryl)alkynes with in‐situ‐prepared SeBr4 has been achieved. The use of an alkene additive as a bromine scavenger gives simple access to functionalized benzo[b]selenophene and selenophenothiophene derivatives from commercially available or easily accessible starting materials. The reactions can be performed in air without the use of moisture‐sensitive reagents, dry solvents, or an inert atmosphere. Mechanistic studies confirmed a regioselective anti 1,2‐addition in the selenobromination step, and a subsequent electrophilic substitution in the aromatic ring to complete the cyclization.
Asymmetric Aldol Reaction of α,α‐Disubstituted Acetaldehydes Catalyzed by Diphenylprolinol Silyl Ether for the Construction of Quaternary Stereogenic Centers
Authors: Hayashi Yujiro , Shomura Hiroki , Xu Qianqian , Lear Martin J. , Sato Itaru 
Published: June 2015

AbstractThe asymmetric cross‐aldol reaction of α,α‐disubstituted acetaldehydes with commercial ethyl glyoxylate polymer was successfully catalyzed by diphenylprolinol silyl ether 3 to generate all‐carbon quaternary stereogenic centers with good enantioselectivity.
Oxidative Heck Reaction of Fluorinated Olefins with Arylboronic Acids by Palladium Catalysis
Authors: Li Yang , Tu Dong‐Huai , Gu Yu‐Jie , Wang Bo , Wang Yao‐Yu , Liu Zhao‐Tie , Liu Zhong‐Wen , Lu Jian 
Published: June 2015

AbstractThe palladium‐catalyzed oxidative Heck reaction of 2,3,3,3‐tetrafluoroprop‐1‐ene with various arylboronic acids was explored for the first time. This method provides a direct route to access (Z)‐β‐fluoro‐β‐(trifluoromethyl)styrenes with high stereoselectivity.
Equilibrium, kinetics, and thermodynamic evaluation of mercury (II) removal from aqueous solutions by moss (Homalothecium sericeum) biomass
Authors: Ozdes Duygu , Duran Celal 
Published: June 2015

In the present research, Homalothecium Sericeum was utilized for the first time as an effective and readily available adsorbent in removal of Hg(II) ions from aqueous solutions through a batch adsorption technique. The effects of initial solution pH, contact time, initial Hg(II) and adsorbent concentration, temperature, and ionic strengths were evaluated on the removal efficiency of Hg(II) ions, after being characterized of H. sericeum by different techniques. The maximum Hg(II) adsorption was obtained as 128.2 mg g−1 at initial pH 6.0 with an equilibrium time of 60 min, adsorbent dosage of 5.0 g L−1 and initial Hg(II) concentration range of 50–750 mg L−1. The adsorption behaviors of Hg(II) ions onto H. sericeum were investigated in terms of kinetics (pseudo‐first order, pseudo‐second order, and intraparticle diffusion models), isotherms (Langmuir, Freundlich, and Dubinin Radushkevich models), and thermodynamics evaluation. Both the Langmuir and Freundlich isotherm models were found to be suitable to describe the adsorption equilibrium while the adsorption kinetics followed by the pseudo‐second order model. Thermodynamic parameters including the Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) changes indicated that the adsorption of Hg(II) ions onto H. sericeum was feasible, spontaneous, and endothermic in nature. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1620–1628, 2015
An integrated field and numerical modelling study of controls on Late Quaternary fluvial landscape development (Tabernas, southeast Spain)
Authors: Geach Martin R. , Viveen Willem , Mather Anne E. , Telfer Matt W. , Fletcher William J. , Stokes Martin , Peyron Odile 
Published: June 2015

AbstractThe variability of Quaternary landforms preserved in the Tabernas basin of southeast (SE) Spain raises numerous questions concerning the roles of external forcing mechanisms (e.g. tectonics and/or climate) and internal landscape properties (e.g. lithological controls) in the evolution of the basin‐wide fluvial system over Late Quaternary timescales. In this study, we apply the FLUVER2 numerical model to investigate the significance of these landscape controls upon patterns of landscape evolution. We highlight the complications of generating realistic input datasets for use in the modelling of long‐term landscape evolution (e.g. discharge and runoff datasets). Model outputs are compared to extensive field mapping of fluvial terraces, their sedimentary architecture and optically stimulated luminescence dating results of the terraces. The results demonstrate the significance of non‐linear rates of flexural tectonic uplift towards the west of the Tabernas Basin which have controlled base levels throughout the Quaternary and promoted the formation of a series of diverging fluvial terraces. Our numerical model results further highlight the importance of climate cycles upon river terrace formation. Basin‐wide aggradation events were modelled during the transition from Marine Isotope Stage (MIS) 6 to 5 and the Last Glacial Maximum (LGM) as supported by field evidence. This aggradational pattern supports the regional hypothesis of terrace formation during global glacial cycles and cold‐to‐warm stage transitions and supports the use of sea surface temperature climate proxy data in the modelling exercise. The availability of sediments derived from the surrounding hillslopes and adjacent alluvial fans explains the generation of substantial terrace aggradations. Copyright © 2015 John Wiley & Sons, Ltd.
Local Evolution of Triple Phase Boundary in Solid Oxide Fuel Cell Stack After Long‐term Operation
Authors: Brus G. , Iwai H. , Otani Y. , Saito M. , Yoshida H. , Szmyd J. S. 
Published: June 2015

AbstractIn this research a 100 W solid oxide fuel cells (SOFCs) stack was tested. After 3,700 hours of continuous operation a subsequent post‐test analysis of the anodes' microstructure was conducted using a combination of focused ion beam and scanning electron microscopy. The obtained data was reconstructed into three‐dimensional images, based on which the microstructure parameters were obtained. The microstructure parameters were quantified at nine different locations in the stack. The discussion focuses on tripe phase boundaries as the most important microstructure parameter strongly affecting the anode performance and degradation. The obtained results indicate strong non‐homogeneous microstructure morphology changes after long‐term operation.