bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Synthesis of 1,2‐Dimetallic Compounds via Direct Insertion of Zinc Powder in the Presence of InCl3: Synthesis of ortho‐Bis‐functionalized Aromatics.
Authors: Klatt Thomas , Bluemke Tobias D. , Ganiek Maximilian A. , Knochel Paul 
Published: June 2014

AbstractThe In(III)‐catalyzed insertion of zinc powder into aromatic 1‐bromo‐2‐triflates or 1,2‐dibromides give 1,2‐dizinc reagents, which readily undergo acylation, cross coupling, and allylation reactions.
ChemInform Abstract: Temporal Separation of Catalytic Activities Allows anti‐Markovnikov Reductive Functionalization of Terminal Alkynes.
Authors: Li Le , Herzon Seth B. 
Published: June 2014

AbstractThe Ru catalysts (RUC) and [Ru(Cp)(MeCN)3]PF6 are found to promote sequential hydration and reduction of terminal alkynes giving 2‐substituted ethanols in good to high yields.
ChemInform Abstract: Boc‐Protected 1‐(3‐Oxocycloalkyl)ureas via a One‐Step Curtius Rearrangement: Mechanism and Scope.
Authors: Sun Xianyu , Rai Rachita , Deschamps Jeffrey R. , MacKerell Alexander D. Jr. , Faden Alan I. , Xue Fengtian 
Published: June 2014

AbstractTreatment of carboxylic acids (I) with Et3N, DPPA, and tBuOH provides the title ureas as major products via Curtius rearrangement followed by an unexpected nucleophilic addition of the resulting tert‐butyl carbamate to an in situ generated isocyanate intermediate.
ChemInform Abstract: Et4NI‐Catalyzed Amidation of Aldehydes and Alcohols with Ammonium Salts.
Authors: Wang Gao , Yu Qing‐Ying , Chen Shan‐Yong , Yu Xiao‐Qi 
Published: June 2014

AbstractThe reaction of alcohols mostly leads to the mixture of the target amides with the corresponding nitriles.
ChemInform Abstract: N‐Picolinamides as Ligands for Ullmann‐Type Homocoupling Reactions.
Authors: Damkaci Fehmi , Altay Esra , Waldron Matthew , Knopp Michael A. , Snow David , Massaro Nicholas 
Published: June 2014

AbstractSubstrates with electron donating groups in the ortho position or substrates lacking ortho ligating groups do not react.
ChemInform Abstract: Synthesis of Nonracemic Polysubstituted Cyclohexanes Through Cascade Reactions of (2R,3S)‐2‐Acetyl‐3‐aryl‐4‐nitrobutanoates, Adducts of Ni(II)‐Catalyzed Michael Addition.
Authors: Reznikov A. N. , Sidnin E. A. , Klimochkin Yu. N. 
Published: June 2014

AbstractA stereoselective two‐step synthesis is given for polysubstituted cyclohexanes of type (V) starting from ethyl acetoacetate (I), nitroalkenes (II), and cinnamic aldehyde (IV).
ChemInform Abstract: Spiroketals of Monosaccharides by Dye‐Sensitized Photooxygenation of Furyl Ketoses.
Authors: Cermola Flavio , Sferruzza Rosalia , Iesce Maria Rosaria 
Published: June 2014

Abstract[4+2] Cycloaddition of singlet oxygen to sugar substituted furans followed by reduction of the corresponding endoperoxides afford functionalized enediones which quickly cyclize into spiroketals.
ChemInform Abstract: Direct Stereospecific Synthesis of Unprotected N—H and N—Me (XII) Aziridines from Olefins.
Authors: Jat J. L. , Paudyal M. P. , Gao H. , Xu Q.‐l. , Yousufuddin M. , Devarajan D. , Ess D. H. , Kurti L. , Falck J. R. 
Published: June 2014

AbstractThis method gives unprotected aziridines from mono‐, di‐, tri‐ and tetrasubstituted olefins in good yields.
ChemInform Abstract: Diazirines as Potent Electrophilic Nitrogen Sources: Application to the Synthesis of Pyrazoles.
Authors: Schneider Yoann , Prevost Julie , Gobin Maelle , Legault Claude Y. 
Published: June 2014

AbstractN‐Monosubstituted diaziridines release, under hydrolysis conditions, the corresponding monosubstituted hydrazines which are further converted into pyrazoles in high yields.
ChemInform Abstract: Eco‐Friendly Synthesis of Guanidinyltetrazole Compounds and 5‐Substituted 1H‐Tetrazoles in Water under Microwave Irradiation.
Authors: El Remaily M. Abd El Aleem Ali Ali , Mohamed Shaaban K. 
Published: June 2014

AbstractThe synthesized compounds are screened for their in vitro antimicrobial activity.
ChemInform Abstract: New Synthesis of (5S*,7aS*)‐5‐Benzyloxy‐5,6,7,7a‐tetrahydrocyclopenta[c]pyran‐3(1H)‐one.
Authors: Lozanova A. V. , Zlokazov M. V. , Veselovsky V. V. 
Published: June 2014

AbstractA new synthesis of pyran (V) starting from a mixture of oximes (I) is presented.
ChemInform Abstract: Enantio‐ and Diastereoselective Hetero‐Diels—Alder Reactions Between 4‐Methyl‐substituted Rawal′s Diene and Aldehydes Catalyzed by Chiral Dirhodium(II) Carboxamidates: Catalytic Asymmetric Synthesis of (‐)‐cis‐Aerangis Lactone (XII).
Authors: Watanabe Yudai , Shimada Naoyuki , Anada Masahiro , Hashimoto Shunichi 
Published: June 2014

AbstractHigh yields and high enantioselectivities are achieved when DMAD and acetyl chloride are used in the workup of the hetero‐Diels‐Alder reaction.
ChemInform Abstract: Photoredox Activation and Anion Binding Catalysis in the Dual Catalytic Enantioselective Synthesis of β‐Amino Esters.
Authors: Bergonzini Giulia , Schindler Corinna S. , Wallentin Carl‐Johan , Jacobsen Eric N. , Stephenson Corey R. J. 
Published: June 2014

AbstractThe enantioselective oxidative C—H functionalization of tetrahydroisoquinoline derivatives (I) is achieved through the merger of photoredox and asymmetric anion‐binding catalysis.
ChemInform Abstract: Modification of γ‐Carbolines with N‐Substituted Propionamides as a New Approach to Mitoprotective Agents.
Authors: Bachurin S. O. , Vinogradova D. V. , Shevtsova E. F. , Goreva T. V. , Epishina T. A. , Aksinenko A. Yu. , Sokolov V. B. 
Published: June 2014

Abstract8 Title compounds are prepared.
ChemInform Abstract: Stereoselective Tandem Synthesis of Thiazolo Fused Naphthyridines and Thienopyridines from O‐Alkynylaldehydes via Au(III)‐Catalyzed Regioselective 6‐endo‐dig Ring Closure.
Authors: Jha Rajeev R. , Saunthwal Rakesh K. , Verma Akhilesh K. 
Published: June 2014

AbstractInterestingly, thienopyridines (V) are formed in significantly lower diastereoselectivity.
ChemInform Abstract: Diborylation of Alkynyl MIDA Boronates and Sequential Chemoselective Suzuki—Miyaura Couplings: A Formal Carboborylation of Alkynes.
Authors: Hyodo Keita , Suetsugu Masato , Nishihara Yasushi 
Published: June 2014

AbstractPlatinum‐catalyzed diborylation of alkynyl (I) boronates with (pinacolato)diboron (II) gives triborylphenylethene with two different boron functionalities which undergoes chemoselective Suzuki—Miyaura coupling with aryl and alkyl halides to afford the target compounds in good yields.
ChemInform Abstract: Total Synthesis of Sandramycin and Its Analogues via a Multicomponent Assemblage.
Authors: Katayama Katsushi , Nakagawa Koji , Takeda Hiroshi , Matsuda Akira , Ichikawa Satoshi 
Published: June 2014

AbstractThe cytotoxic activity of sandramycin (Ia) and its analogues (Ib,c) against a range of human cancer cell lines is evaluated.
ChemInform Abstract: Stereoselective Synthesis of Protectin D1: A Potent Antiinflammatory and Proresolving Lipid Mediator.
Authors: Aursnes M. , Tungen J. E. , Vik A. , Dalli J. , Hansen T. V. 
Published: June 2014

AbstractThe UV and LC/MS‐MS data recorded on the synthetically prepared protectin D1 (I) match those of the endogenously produced material.
ChemInform Abstract: Simultaneous Removal of NOX and SO2 with H2O2 over Fe Based Catalysts at Low Temperature.
Authors: Ding Jie , Zhong Qin , Zhang Shule 
Published: June 2014

AbstractSimultaneous flue gas desulfurization and denitrification are achieved with OH radicals generated from H2O2 catalyzed by Fe based transition metal (Fe, Fe‐Al, Fe‐Ti, Fe‐Si) oxides in the duct, followed by purification with NH3‐based glass made washing tower.
Approximate pressure drop and filtration efficiency expressions for semi‐open wall‐flow channels
Authors: Haralampous Onoufrios , Kontzias Theodore 
Published: June 2014

AbstractSemi‐open wall‐flow channels are conventional filter channels with missing plugs either in the frontal or rear side. This configuration has lately become an interesting modelling issue with respect to partial filters designed for the emerging markets and as a special case of wall‐flow filters, that have suffered damage due to regeneration. This paper presents the development of approximate analytical expressions for the estimation of pressure drop and filtration efficiency of semi‐open channels. In order to facilitate the derivation, realistic assumptions are employed and the results are extensively validated using a commercial simulation software, able to solve the differential equations system of the 1D channel model. The validation covers important design parameters and operational conditions, namely filter permeability, length, mass flow rate and soot loading. It is shown that the analytical expressions can predict all trends and moreover offer clear physical explanations. The pressure drop calculation does not exceed 6% of the numerical prediction, while the filtration efficiency absolute error lies within 6% except for specific cases. Finally, a partially failed DPF is simulated using the developed expressions and a commercial CFD package in order to estimate the failure effect on filtration and pressure drop performance. In this way, the usability of the proposed modelling approach is demonstrated.
Hollow Nanospheres Constructed by CoS2 Nanosheets with a Nitrogen‐Doped‐Carbon Coating for Energy‐Storage and Photocatalysis
Authors: Peng Shengjie , Li Linlin , Mhaisalkar Subodh G. , Srinivasan Madhavi , Ramakrishna Seeram , Yan Qingyu 
Published: June 2014

AbstractHierarchical CoS2 hollow nanospheres (HSs) with a nitrogen‐doped‐carbon coating (NC@CoS2) are fabricated by a simple solution method. The uniform 300 nm‐sized NC@CoS2 HSs are composed of ultrathin nanosheet subunits with a thickness of around 2 nm. It was found that polyvinylpyrrolidone and ethylenediamine not only controlled the morphology of the products, but also provided the sources of nitrogen‐doped carbon. Benefiting from their unique structural characteristics, hierarchical NC@CoS2 HSs can be applied in lithium‐ion batteries, supercapacitors, and photocatalysis. When evaluated as an electrode material, NC@CoS2 with a coating of optimal thickness showed a high lithium‐storage capability with a good cycling stability. Moreover, NC@CoS2 had a remarkable supercapacitive performance and photocatalytic activity. The attractive electrochemical and photocatalytic performances were attributed to the overall structural features of the NC@CoS2 hollow spheres: the N‐doped‐carbon (NC) coating, hollow interior, and ultrathin nanosheets.
Direct Synthesis of Fe3C‐Functionalized Graphene by High Temperature Autoclave Pyrolysis for Oxygen Reduction
Authors: Hu Yang , Jensen Jens Oluf , Zhang Wei , Huang Yunjie , Cleemann Lars N. , Xing Wei , Bjerrum Niels J. , Li Qingfeng 
Published: June 2014

AbstractWe present a novel approach to direct fabrication of few‐layer graphene sheets with encapsulated Fe3C nanoparticles from pyrolysis of volatile non‐graphitic precursors without any substrate. This one‐step autoclave approach is facile and potentially scalable for production. Tested as an electrocatalyst, the graphene‐based composite exhibited excellent catalytic activity towards the oxygen reduction reaction in alkaline solution with an onset potential of ca. 1.05 V (vs. the reversible hydrogen electrode) and a half‐wave potential of 0.83 V, which is comparable to the commercial Pt/C catalyst.
Towards realistic connectivity restoration in partitioned mobile sensor networks
Authors: Senturk I.F. , Akkaya K. , Janansefat S. 
Published: June 2014

SummaryThe connectivity of a disjoint mobile sensor network can be restored by moving a set of nodes to certain destinations. However, all of the existing works have assumed that the selected destinations can be reached via direct path movement, which may not be the case in real‐world applications because of obstacles or terrain elevation. In addition, even if direct path movement is successful, optimal energy efficiency cannot be attained by neglecting the elevation or friction of the terrain when determining the movement path of the nodes. Thus, in the recovery efforts, terrain type, elevation, obstacles, and possible localization errors should be considered in order to guarantee the connectivity restoration while minimizing the recovery cost in terms of energy. In this paper, we pick two sample distributed and centralized connectivity restoration approaches from the literature to show that these approaches fail to restore connectivity in many cases due to the lack of considering realistic issues. These approaches are re‐designed in order to determine movement trajectory based on a path planning algorithm, which considers the risk and elevation of the terrain sections. Experiment results reveal several issues regarding the performance in terms of energy consumption and recovery delay. Copyright © 2014 John Wiley & Sons, Ltd.
Modulating the MII/Pyrimidine‐4,6‐dicarboxylato System by Metal, Solvent and Temperature Variation
Authors: Cepeda Javier , Pérez‐Yáñez Sonia 
Published: June 2014

AbstractWe report herein the synthesis and physicochemical characterisation of seven new compounds employing divalent metal ions and pyrimidine‐4,6‐dicarboxylato ligand (pmdc): {[Cd(μ‐pmdc)(H2O)3]·2H2O}n (1), [Cd(phen)(μ3‐pmdc)]n (2), [Cd(μ5‐pmdc)]n (3), {[Ca(μ3‐pmdc)(H2O)3]·H2O}n (4), {[Mn(μ‐pmdc)(form)(H2O)]·2H2O}n (5), [Cu(μ‐pmdc)(DMSO)2]n (6), and {[Zn(μ‐pmdc)(DMF)(H2O)]·DMF}n (7) (where phen = 1,10‐phenanthroline, form = formamide, DMSO = dimethyl sulfoxide, DMF = dimethylformamide). These compounds are the result of three different approaches that share a common aim: to replace/eliminate coordination solvent molecules to force unusual coordination modes of pmdc that render MII‐pmdc polymers with different structural motifs. To this end, we have employed either metal ions that permit high coordination numbers or organic aprotic solvents that can also act as terminal ligands, while different thermal treatments have been applied to both the reaction mixtures as well as solid compounds. The crystal structure of compound 1 contains zig‐zag polymeric chains in which mer‐[Cd(H2O)3]2+ units are sequentially joined by means of bis‐chelating pmdc ligands. Compound 2 is made up of stacked neutral layers that are built up from the fusion of two independent centrosymmetric [Cd2(phen)2(μ3‐pmdc)2] dinuclear units. Hydrothermal treatment at higher temperature led to compound 3, which presents a three‐dimensional framework in which the pmdc ligand exhibits an unprecedented μ5‐κ2N,O:κ2N′,O′:κO′:κO″:κO″′ coordination mode. Moreover, thermogravimetric and thermodiffractometric analyses of 1 have also provided access to an alternative route to obtain higher dimensional frameworks with crystal structures that differ from those crystallised in dissolution. Compound 4 consists of neutral 2D [Ca(μ3‐pmdc)(H2O)3] sheets that are formed by the junction of calcium‐pmdc chains through carboxylate oxygen bridges, exhibiting a herringbone pattern. On the other hand, formamide, dimethyl sulfoxide, and dimethylformamide have been employed in compounds 5–7 to evaluate their effect on the resulting coordination polymer. A common feature in these compounds is the one‐dimensional structure displayed and the fact that at least one solvent molecule is coordinated to the metal atoms. Whereas the manganese and zinc compounds exhibit corrugated MII‐pmdc chains, the copper compound adopts the more typical planar arrangement. The disposition of the chains of compounds 5–7 has been rationalised on the basis of the steric hindrance imposed by the coordination of the ligands, which determines the more stable geometrical isomer in each case.
Non‐esterified fatty acids induce apoptosis via a ROS‐dependent mechanism involving the mitochondrial pathway in bovine abomasal smooth muscle cells
Authors: Wei Teng , Tian Wulin , Xie Guanghong 
Published: June 2014

Increased blood non‐esterified fatty acid (NEFA) concentrations might be implicated as a factor that plays a role in the pathogenesis of gastrointestinal motility disorder, such as abomasal displacement. We sought to elucidate possible effects of high concentrations of NEFA on primary cultured bovine abomasal smooth muscle cells (BSMC). BSMC treated with high concentrations of NEFA resulted in decrease of cell viability and increase of cell apoptosis rate. NEFA treatment induced oxidative stress, as revealed by increased levels of ROS and MDA, while decreased the antioxidative abilities (SOD, CAT, GSH, and GSSG) in BSMC. Meanwhile, high concentrations of NEFA induced BSMC mitochondrial apoptotic cell death. Mitochondrial membrane potential decrease, increased Bax and decreased Bcl‐2, cytochrome c release, caspases activation, and apoptosis inducing factor (AIF) translocation were observed in NEFA‐treated cells. Pretreatment with the antioxidant N‐acetylcysteine (NAC) effectively reversed these NEFA‐induced events. In conclusion, these results show that NEFA induce BSMC apoptosis mainly via a ROS‐dependent mechanism involving the mitochondrial pathway.The cytotoxicity of non‐esterified fatty acid (consist of oleic acid, linoleic acid, palmitic acid, stearic acid, and palmitoleic acid) on primary cultured bovine abomasal smooth muscle cell, and the underlying molecular mechanism.
Chemical Transformations and Photophysical Properties of meso‐Tetrathienyl‐Substituted Porphyrin Derivatives
Authors: Betoni Momo Patrícia , Pavani Christiane , Baptista Mauricio S. , Brocksom Timothy John , Thiago de Oliveira Kleber 
Published: June 2014

AbstractThe chemistry of meso‐tetrathienyl‐substituted porphyrin derivatives was explored, including synthesis and subsequent metalation, nitration and 1,3‐dipolar cycloaddition reactions. Mono‐ and tetra‐nitro‐meso‐tetrathienylporphyrins were prepared selectively under mild nitration conditions with NaNO2 and trifluoroacetic acid, and the corresponding chlorins and bacteriochlorins were also obtained by reaction with 1,3‐dipoles. The products were characterized in detail and their preliminary photophysical properties were evaluated.
Methanesulfonic Acid Mediated Cyclization and Meyer–Schuster Rearrangement of γ‐Amino‐ynones: Access to Enantiopure Pyrrolidine Exocyclic Vinylogous Amides
Authors: Vu Huy‐Dinh , Renault Jacques , Roisnel Thierry , Gouault Nicolas , Uriac Philippe 
Published: June 2014

Abstractα‐ and β‐Amino‐ynones have been largely used to prepare heterocyclic rings in the presence of various electrophiles such as protic acids or gold(I). Herein we disclose the unprecedented formation of pyrrolidine exocyclic vinylogous amides, in place of the expected azepinones or piperidinones, starting from γ‐amino‐ynones derived from amino acids. The process involves a tandem 1,2‐addition of the protected nitrogen to the carbonyl group followed by a Meyer–Schuster rearrangement, which efficiently afforded enantiopure pyrrolidine exocyclic vinylogous amides. The sequence is poorly catalyzed by gold salts, but proved to be very efficient in the presence of methanesulfonic acid.
Ecomorphodynamics of rivers with converging boundaries
Authors: Perona Paolo , Crouzy Benoît , McLelland Stuart , Molnar Peter , Camporeale Carlo 
Published: June 2014

ABSTRACTMany rivers worldwide show converging sections where a characteristic limiting front for vegetation establishment on gravel bars is observed. An important conceptual model was advanced in 2006 by Gurnell and Petts, who demonstrated that for the convergent section of the Tagliamento River the downstream front of vegetation establishment can be explained by unit stream power. We introduce a theoretical framework based on 1D ecomorphodynamic equations modified to account for the biological dynamics of vegetation. We obtain the first analytical result explaining the position and river width where vegetation density is expected to vanish in relation to a characteristic streamflow magnitude and both hydraulic and biological parameters. We apply our model to a controlled experiment within a convergent flume channel with growing seedlings perturbed by periodic floods. For a range of timescales where hydrological and biological processes interact, we observe the formation of a front in the convergent section beyond which vegetation cannot survive, the location of which is explained by flow magnitude. This experiment confirms that the timescales of the involved processes and the unit stream power determine the existence and the position of the front within convergent river reaches, respectively. Copyright © 2014 John Wiley & Sons, Ltd.
Granitic coastal geomorphology: applying integrated terrestrial and bathymetric LiDAR with multibeam sonar to examine coastal landscape evolution
Authors: Kennedy David M. , Ierodiaconou Daniel , Schimel Alexandre 
Published: June 2014

ABSTRACTCoasts composed of resistant lithologies such as granite are generally highly resistant to erosion. They tend to evolve over multiple sea level cycles with highstands acting to remove subaerially weathered material. This often results in a landscape dominated by plunging cliffs with shore platforms rarely occurring. The long‐term evolution of these landforms means that throughout the Quaternary these coasts have been variably exposed to different sea level elevations which means erosion may have been concentrated at different elevations from today. Investigations of the submarine landscape of granitic coasts have however been hindered by an inability to accurately image the nearshore morphology. Only with the advent of multibeam sonar and aerial laser surveying can topographic data now be seamlessly collected from above and below sea level. This study tests the utility of these techniques and finds that very accurate measurements can be made of the nearshore thereby allowing researchers to study the submarine profile with the same accuracy as the subaerial profile. From a combination of terrestrial and marine LiDAR data with multibeam sonar data, it is found that the morphology of granite domes is virtually unaffected by erosion at sea level. It appears that evolution of these landscapes on the coast is a very slow process with modern sea level acting only to remove subaerially weathered debris. The size and orientation of the joints determines the erosional potential of the granite. Where joints are densely spaced (<2 m apart) or the bedrock is highly weathered can semi‐horizontal surfaces form. Copyright © 2014 John Wiley & Sons, Ltd.