bluuebunny/crossref_metadata_2025_split huggingface dataset:
Palladium(II)‐Catalyzed C3‐Selective Friedel–Crafts Reaction of Indoles with Aziridines
Authors: Yin JieXiang , Hyland Dr Christopher J. T. 
Published: September 2016

AbstractThe [PdCl2(MeCN)2]‐catalyzed C3‐selective Friedel–Crafts reaction of 2,2‐disubstituted and 2‐aryl‐N‐tosylaziridines with indoles is reported. For the 2,2‐disubstituted substrates, [PdCl2(MeCN)2] alone, without any ancillary ligands, is an efficient catalyst for the ring‐opening reaction. The presence of 1,4‐benzoquinone as an additive was found to enhance the ring‐opening reaction of the less‐reactive 2‐arylaziridines. This reaction displayed a broad substrate scope with respect to the indole substrate and is operationally simple. Finally, when 1,3‐dimethylindole was employed as a substrate, the de‐aromatized pyrroloindoline product was obtained in high yield and good diastereoselectivity.
Comment on ‘Super‐resolution microscopy by movable thin‐films with embedded microspheres: Resolution analysis’ [Ann. Phys. (Berlin) 527, 513 (2015)]
Authors: Darafsheh Arash 
Published: September 2016

This work addresses the shortcomings of the recent paper by Allen et al. [Ann. Phys. (Berlin) 527, 513 (2015)], in which the authors attempted to quantify the spatial resolution and magnification in imaging by using microsphere‐embedded films. Their methodology in resolution and magnification analyses is ill‐considered and worth discussing. Neglecting the impact of the confocal arrangement, used for imaging in their work, on the resolution improvement factor has led to an exaggerated claim of ∼λ/6 as the inherent resolution gain of the microsphere. However, this ∼λ/6 value cannot be solely attributed to the microspheres because, the effects the pinhole function and image acquisition process of the laser scanning confocal microscope must be separated from their results in order to find the inherent resolution gain of the microsphere. The magnification analysis is flawed for several reasons: invalidity of geometrical optics for micron‐scale spheres, neglecting the impact of the index of the PDMS film surrounding the microsphere, and the cyclic methodology used in presenting the magnification results. Specifically, such large claimed gaps between the object and the microsphere as a mediator of near‐field information contradicts the coupling condition requirement, as claimed by the authors, between the scattered evanescent field of the object and the microsphere.
Variation of periodic crazing based on polymer blends of an ultra‐high and a low molecular weight poly(methyl methacrylate)
Authors: Naito Keishi , Takeno Akiyoshi , Morifuji Ryota , Miyata Toshiaki , Miwa Minoru , Takahashi Shinya 
Published: September 2016

ABSTRACTPeriodic crazes are caused in a polymer film by the unique mechanical method using bending. Generation of a craze depends on entanglements of the molecular chains of a polymer. Therefore, control of composite morphology of periodic crazes was attempted by varying the entanglements of molecular chains. An effective entanglement network became sparse by polymer blends of an ultra‐high molecular weight polymethylmethacrylate (PMMA) and a low molecular weight PMMA. Consequently, the composite morphology of periodic crazes caused in the blend film varied. In other words, the periodic craze can be used for the evaluation of the effective entanglements. In addition, it was figured out that PMMA of which the number‐average molecular weight (Mn) is less than twice of the effective entanglement molecular weight (Me*) works as a plasticizer in the blend film. And also, it was revealed that the mechanical properties of the blend film decreased dramatically at Mn ≒ 6Me*. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44332.
The cohesive energy density of polymers and its relationship to surface tension, bulk thermodynamic properties, and chain structure
Authors: Dee Gregory T. , Sauer Bryan B. 
Published: September 2016

ABSTRACTThe cohesive energy density (CED) and the internal pressure (Pi) have similar values for most liquids at low pressures. For most polymers CED cannot be directly measured, unlike Pi which is readily obtained in the melt from PVT or other related data. Directly measured CED are available for the oligomer linear alkane series over a moderate molecular weight (MW) range. Scaling CED with measured surface tensions (ɣ) leads to separation into two universal scaling curves, which provides a measure of surface configurational entropy, as does the MW dependence of experimental surface tensions for two polymer series. A novel polymer scaling curve based on CED is shown to provide improved accuracy in the prediction of ɣ for any polymer or solvent. For polymers that interact predominately through Van der Waals forces, correlations between the average interchain separation distances and the magnitude of CED (or Pi), are shown to give a universal derivation of CED. In contrast, polymers like P4VP having strong polar interactions provide dramatic evidence of the different physical basis of CED and Pi. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44431.
Starch nanocomposite films incorporating grape pomace extract and cellulose nanocrystal
Authors: Xu Yixiang , Scales Anita , Jordan Krystle , Kim Chyer , Sismour Edward 
Published: September 2016

ABSTRACTThe objectives of this study were to prepare starch nanocomposite films incorporating grape pomace extract (GPE) and cellulose nanocrystal (CNC) using a solvent‐casting method, and to characterize the mechanical properties, color, water vapor transmission rate (WVTR), crystalline structure, morphology, thermal stability, phenolic compound release profile and antibacterial activity of the films. Incorporating CNC and GPE significantly (P < 0.05) increased the films’ thickness, mechanical properties, and opacity. Brightness and color were mainly influenced by GPE level, while CNC had a great impact on the reduction of WVTR values of the film. Three characteristic cellulose I crystalline peaks were observed using X‐ray diffraction in CNC‐containing nanocomposite films. However, the effect of CNC levels on thermal stability was not significant. Phenolic compound releases were time and film dependent, and the nanocomposite films incorporating with GPE and CNC exhibited stronger inhibitory effect against Staphylococcus aureus ATCC 29213 compared to Listeria monocytogenes ATCC 7644. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44438.
Improvement of antifouling performance of poly(l‐lactic acid) membranes through incorporating polyaniline nanoparticles
Authors: Jiang Bin , Wang Baoyu , Zhang Luhong , Sun Yongli , Xiao Xiaoming , Yang Na , Dou Haozhen 
Published: September 2016

ABSTRACTPoly(l‐lactic acid) (PLLA) composite membranes were fabricated by nonsolvent induced phase separation method using polyaniline (PANI) as an additive. Membrane structure was characterized by attenuated total reflectance Fourier transform‐infrared spectroscopy, X‐ray diffraction, scanning electron microscopy, porosity, and pore size analysis. Membrane performance was assessed by goniometer, pure water flux, molecular weight cut‐off, static adsorption and dynamic filtration. The incorporation of PANI significantly improved the hydrophilicity and permeability of PLLA composite membrane, and eventually enhanced the antifouling performance of composite membrane compared with pure PLLA membrane. It was demonstrated that PLLA composite membrane with 1 wt % PANI had better separation and antifouling performance compared with other composite membranes. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2017,134, 44452.
Efficient Aerobic Oxidation of 5‐Hydroxymethylfurfural in Aqueous Media with Au–Pd Supported on Zinc Hydroxycarbonate
Authors: Gui Zhenyou , Cao Wenrong , Saravanamurugan Shunmugavel , Riisager Anders , Chen Lifang , Qi Zhiwen 
Published: September 2016

AbstractBimetallic catalysts with Au–Pd supported on zinc hydroxycarbonate (ZOC) were synthesized by a simple deposition–precipitation method and analyzed by transmission electron microscopy to have a narrow‐size distribution of predominantly 1–2 nm. The prepared Au–Pd/ZOC catalysts exhibited excellent activity towards 5‐hydoxymethylfurfural (HMF) oxidation in water in the presence of the base NaHCO3 at benign conditions of 80 °C and 3 bar O2, resulting in quantitative yield of 2,5‐furandicarboxylic acid (FDCA). The addition of base not only enhanced the yield of FDCA but also stabilized the support ZOC by preventing ZOC from the reaction with formed carboxylic acid intermediates/products, thus allowing Au–Pd/ZOC to be recycled for at least six times without significant loss of activity. The basicity of ZOC could play an important role in obtaining the improved yield of FDCA as compared to other supports.
Treating Copper(II) Oxide Nanoflowers with Hydrogen Peroxide: A Novel and Facile Strategy To Prepare High‐Performance Copper(II) Oxide Nanosheets with Exposed (1 1 0) Facets
Authors: Peng Honggen , Liu Yang , Guo Yao , Zhang Jingyan , Zhang Li , Zhou Simei , Xu Xianglan , Liu Wenming , Zhang Ning , Wang Xiang 
Published: September 2016

AbstractCuO nanosheets with exposed active (1 1 0) facets were facilely prepared through surface structure engineering by reassembling CuO nanoflowers in H2O2 aqueous solution. The CO oxidation activity on these CuO nanosheets was markedly higher than that on the pristine nanoflowers, for which the 100 % CO conversion temperature on the former was 40 °C lower than that on the latter and equal to that on a commercial catalyst (1 %Pd/γ‐Al2O3). This work provides a new strategy to design and prepare high‐performance nanostructured CuO catalysts.
ChemInform Abstract: Synthesis and Characterization of Kesterite Cu2ZnSnTe4 via Ball‐Milling of Elemental Powder Precursors.
Authors: Pareek Devendra , Balasubramaniam K. R. , Sharma Pratibha 
Published: September 2016

AbstractThe title compound is synthesized by ball‐milling of powder mixtures of Cu, Zn, Sn, and Te (planetary ball mill, 450 rpm, 30 h).
ChemInform Abstract: Base‐Free Conditions for Rhodium‐Catalyzed Asymmetric Arylation to Produce Stereochemically Labile α‐Aryl Ketones.
Authors: Dou Xiaowei , Lu Yixin , Hayashi Tamio 
Published: September 2016

AbstractA chiral diene‐rhodium μ‐chloro dimer is found to be an efficient catalyst for the asymmetric hydroarylation of a variety of cyclic enones and analogous substrates such as (XIV) and (XVI).
ChemInform Abstract: One for Many: A Universal Reagent for Acylation Processes.
Authors: Moon Hyun Kyung , Sung Gi Hyeon , Kim Bo Ram , Park Jong Keun , Yoon Yong‐Jin , Yoon Hyo Jae 
Published: September 2016

Abstract2‐Acyloxypyridazinone is utilized as heterocycle‐based acyl‐transfer agent in various acylation reactions.
ChemInform Abstract: Electrophilic Bromolactonization of Cyclopropyl Carboxylic Acids Using Lewis Basic Sulfide Catalyst.
Authors: Ke Zhihai , Wong Ying‐Chieh , See Jie Yang , Yeung Ying‐Yeung 
Published: September 2016

AbstractIn the absence of light, the sulfide‐catalyzed electrophilic bromolactonization yields the Markovnikov product exclusively.
ChemInform Abstract: A Supramolecular Ensemble of a PBI Derivative and Cu2O NPs: Potential Photocatalysts for the Suzuki and Suzuki Type Coupling Reactions.
Authors: Singh Gurpreet , Kumar Manoj , Sharma Kamaldeep , Bhalla Vandana 
Published: September 2016

AbstractThe aggregates of a perylene bisimide derivative in combination with Benedict′s reagent are used as photocatalyst for the photocatalytic Suzuki‐type coupling reaction of boronic acid/ester with tosyl aziridines and for Suzuki coupling reactions with various aryl halides.
ChemInform Abstract: Selectivity Modulation of the Ley—Griffith TPAP Oxidation with N‐Oxide Salts.
Authors: Moore Peter W. , Jiao Yanxiao , Mirzayans Paul M. , Sheng Lexter Ng Qi , Hooker Jordan P. , Williams Craig M. 
Published: September 2016

AbstractA novel non‐hygroscopic DABCO N‐oxide tetraphenylborate proves superior as co‐oxidant in the Ley—Griffith (TPAP) oxidation of benzylic and allylic alcohols under non‐anhydrous conditions.
ChemInform Abstract: Copper(II)‐Mediated Intermolecular C(sp2)—H Amination of Benzamides with Electron‐Rich Anilines.
Authors: Singh Bijaya Kumar , Polley Arghya , Jana Ranjan 
Published: September 2016

AbstractThe directed Cu(II)‐mediated ortho C—H amination of N‐quinolin‐8‐yl amides with electronically neutral or electron‐rich anilines is developed.
ChemInform Abstract: Stereospecific Synthesis of α‐Amino Allylsilane Derivatives Through a [3,3]‐Allyl Cyanate Rearrangement. Mild Formation of Functionalized Disiloxanes.
Authors: Henrion Sylvain , Carboni Bertrand , Cossio Fernando P. , Roisnel Thierry , Villalgordo Jose M. , Carreaux Francois 
Published: September 2016

AbstractThis reaction is based on a [3,3]‐allyl cyanate sigmatropic rearrangement via isocyanate intermediate which is trapped by several nucleophiles, opening the way for the preparation of chiral functionalized compounds such as the α‐ureido allylsilanes or carbamate derivatives.
ChemInform Abstract: Cross‐Electrophile Coupling of Vinyl Halides with Alkyl Halides.
Authors: Johnson Keywan A. , Biswas Soumik , Weix Daniel J. 
Published: September 2016

AbstractThe Ni‐catalyzed reductive coupling of (Z)‐vinyl bromides with alkyl halides leads to (Z)‐alkenes in moderate to good yields.
ChemInform Abstract: Development of a syn‐Selective Mannich Reaction of Aldehydes with Propargylic Imines by Dual Catalysis: Asymmetric Synthesis of Functionalized Propargylic Amines.
Authors: Lapuerta Irati , Vera Silvia , Oiarbide Mikel , Palomo Claudio 
Published: September 2016

AbstractEnolizable aldehydes are coupled with C‐alkynyl imines to produce an intermediate aldehyde adduct which is immediately reduced to the alcohol.
ChemInform Abstract: Palladium‐Catalyzed Room‐Temperature Acylative Suzuki Coupling of High‐Order Aryl Borons with Carboxylic Acids.
Authors: Si Shufen , Wang Chen , Zhang Nan , Zou Gang 
Published: September 2016

AbstractDiarylborinic acids and tetraarylboronates are described as practical aryl source for the Pd‐catalyzed Suzuki coupling of carboxylic acids to yield ketones.
ChemInform Abstract: Sulfinyl‐Mediated Stereoselective Overman Rearrangements and Diels—Alder Cycloadditions.
Authors: Colomer Ignacio , Gheewala Chirag , Simal Carmen , Velado Marina , Fernandez de la Pradilla Roberto , Viso Alma 
Published: September 2016

AbstractTrichloroacetamidates are used as substrates in the title rearrangement to produce the desired allylic amine synthons in a highly stereoselective manner as is demonstrated for a few examples.
ChemInform Abstract: Intra‐ and Intermolecular Nickel‐Catalyzed Reductive Cross‐Electrophile Coupling Reactions of Benzylic Esters with Aryl Halides.
Authors: Konev Mikhail O. , Hanna Luke E. , Jarvo Elizabeth R. 
Published: September 2016

AbstractAn intramolecular cross‐electrophile cyclization of benzylic pivalates having an ortho‐bromoaryl substituent is developed providing facile access to indanones and tetralins.
ChemInform Abstract: Facile Synthesis of Novel Halogenated 4‐Pyrazolylspirocyclic‐β‐lactams: Versatile Heterocyclic Synthons.
Authors: Bhalla Aman , Bari Shamsher S. , Bhalla Jitender , Khullar Sadhika , Mandal Sanjay 
Published: September 2016

AbstractThe synthesis of the title species (IV) is based on iodine mediated intrasulfenyl cyclization of precursors (III).
ChemInform Abstract: Catalytic Enantioselective Addition of Pyrazol‐5‐ones to Trisubstituted Nitroalkenes with an N‐Sulfinylurea Organocatalyst.
Authors: Phelan James P. , Ellman Jonathan A. 
Published: September 2016

AbstractThe title reaction represents the first example of a Michael addition of a carbon nucleophile to a trisubstituted nitroalkene followed by enantioselective nitronate protonation.
ChemInform Abstract: Diastereoselective and Regiodivergent Oxa‐[3 + 2] Cycloaddition of Achmatowicz Products and Cyclic 1,3‐Dicarbonyl Compounds.
Authors: Yu Jingxun , Ma Haichen , Yao Hongliang , Cheng Hang , Tong Rongbiao 
Published: September 2016

AbstractDepending on the reaction conditions, either annulated furo[3,2‐b]pyran or furo[2,3‐b]pyran scaffolds are highly diastereoselectively obtained.
ChemInform Abstract: Sulfonic Acid—Functionalized Magnetic Fe3‐xTixO4 Nanoparticles: New Recyclable Heterogeneous Catalyst for One‐Pot Synthesis of Tetrahydrobenzo[b]pyrans and Dihydropyrano[2,3‐c]pyrazole Derivatives.
Authors: Azarifar Davood , Abbasi Younes 
Published: September 2016

AbstractSulfonic acid—functionalized magnetic Fe3‐xTixO4 nanoparticles are used as magnetic acidic catalyst for the one‐pot three‐component synthesis of (IV) and (VII).
ChemInform Abstract: Hydrohalogenative Aromatization of Multiynes Promoted by Ruthenium Alkylidene Complexes.
Authors: Karmakar Rajdip , Wang Kung‐Pern , Yun Sang Young , Mamidipalli Phani , Lee Daesung 
Published: September 2016

AbstractThe benzannulation of tethered bis‐1,3‐diynes via regioselective incorporation of hydrohalogens using halogenated hydrocarbons is described.
ChemInform Abstract: An Efficient Synthesis of Phosphoramidates from Halides in Aqueous Ethanol.
Authors: Dangroo N. A. , Dar A. A. , Shankar R. , Khuroo M. A. , Sangwan P. L. 
Published: September 2016

AbstractThe facile protocol allows the synthesis of phosphoramidates from in situ generated azides and phosphite (II).
ChemInform Abstract: Engyodontochones, Antibiotic Polyketides from the Marine Fungus Engyodontium album Strain LF069.
Authors: Wu Bin , Wiese Jutta , Wenzel‐Storjohann Arlette , Malien Susan , Schmaljohann Rolf , Imhoff Johannes F. 
Published: September 2016

AbstractNovel engyodontochones A (I) and B (II) show potent inhibitory activity against methicillin‐resistant Staphylococcus aureus.
ChemInform Abstract: Growth of Carbon Nanotubes from Waste Blast Furnace Gases at Atmospheric Pressure.
Authors: Sagu Jagdeep S. , Wijayantha K.G. Upul , Holland Paul , Bohm Mallika , Bohm Siva , Rout Tapan Kumar , Bandulasena Hemaka 
Published: September 2016

AbstractIn the lights of the steel industry contributing most to carbon emissions (CO2 greenhouse gases), carbon nanotubes (CNTs) are grown by chemical vapor deposition (CVD) on steel substrates which act as catalysts for the CNT growth.
ChemInform Abstract: The Synthesis of Cyclophellitol‐Aziridine and its Configurational and Functional Isomers
Authors: Jiang Jianbing , Artola Marta , Beenakker Thomas J. M. , Schroeder Sybrin P. , Petracca Rita , de Boer Casper , Aerts Johannes M. F. G. , van der Marel Gijsbert A. , Codee Jeroen D. C. , Overkleeft Herman S. 
Published: September 2016

AbstractReview: [45 refs.
On the Stability of Cyclophane Derivates Using a Molecular Fragmentation Method
Authors: Meitei Oinam Romesh , Heßelmann Andreas 
Published: September 2016

AbstractA molecular fragmentation method is used to study the stability of cyclophane derivates by decomposing the molecular energy into the molecular strain and intramolecular interaction energies. The molecular strain energies obtained by utilising the fragmentation method are in good agreement with existing experimental data. The intramolecular interaction energies calculated as the difference between the supermolecular energy and the bonded fragment energies are repulsive in the cyclophanes studied. The nature of this interaction is studied for groups of systematically extended doubled layered paracyclophane systems using the random‐phase approximation (RPA), two recently developed extensions to the RPA and standard density functional theory (DFT) methods including dispersion corrections. Upon a systematic increase in conjugation the strongly repulsive intramolecular interaction energy reduces and thus leads to an increase in the stability. Finally, existing experimental and theoretical estimates of the molecular strain are compared with the results of this work.
Reduced aboveground tree growth associated with higher arbuscular mycorrhizal fungal diversity in tropical forest restoration
Authors: Holste Ellen K. , Holl Karen D. , Zahawi Rakan A. , Kobe Richard K. 
Published: September 2016

AbstractEstablishing diverse mycorrhizal fungal communities is considered important for forest recovery, yet mycorrhizae may have complex effects on tree growth depending on the composition of fungal species present. In an effort to understand the role of mycorrhizal fungi community in forest restoration in southern Costa Rica, we sampled the arbuscular mycorrhizal fungal (AMF) community across eight sites that were planted with the same species (Inga edulis, Erythrina poeppigiana, Terminalia amazonia, and Vochysia guatemalensis) but varied twofold to fourfold in overall tree growth rates. The AMF community was measured in multiple ways: as percent colonization of host tree roots, by DNA isolation of the fungal species associated with the roots, and through spore density, volume, and identity in both the wet and dry seasons. Consistent with prior tropical restoration research, the majority of fungal species belonged to the genus Glomus and genus Acaulospora, accounting for more than half of the species and relative abundance found on trees roots and over 95% of spore density across all sites. Greater AMF diversity correlated with lower soil organic matter, carbon, and nitrogen concentrations and longer durations of prior pasture use across sites. Contrary to previous literature findings, AMF species diversity and spore densities were inversely related to tree growth, which may have arisen from trees facultatively increasing their associations with AMF in lower soil fertility sites. Changes to AMF community composition also may have led to variation in disturbance susceptibility, host tree nutrient acquisition, and tree growth. These results highlight the potential importance of fungal–tree–soil interactions in forest recovery and suggest that fungal community dynamics could have important implications for tree growth in disturbed soils.
Evaluation of the 2‐(1‐Hexyloxyethyl)‐2‐devinyl pyropheophorbide (HPPH) mediated photodynamic therapy by macroscopic singlet oxygen modeling
Authors: Penjweini Rozhin , Kim Michele M. , Liu Baochang , Zhu Timothy C. 
Published: September 2016

Photodynamic therapy (PDT) is known as a non‐invasive treatment modality that is based on photochemical reactions between oxygen, photosensitizer, and a special wavelength of light. However, a dosimetric predictor for PDT outcome is still elusive because current dosimetric quantities do not account for the differences in the PDT oxygen consumption rate for different fluence rates. In this study, we evaluate several dose metrics, total fluence, photobleaching ratio, PDT dose, and mean reacted singlet oxygen (mean [1O2]rx) for predicting the PDT outcome and a clinically relevant tumor re‐growth endpoint. For this reason, radiation‐induced fibrosarcoma (RIF) mice tumors are treated with 2‐(1‐Hexyloxyethyl)‐2‐devinyl pyropheophorbide (HPPH) and different in‐air fluences (30 J/cm2, 50 J/cm2, 135 J/cm2, 250 J/cm2, and 350 J/cm2) and in‐air fluence rates (20, 50, 75, 150 mW/cm2). Explicit measurements of HPPH and oxygen concentration as well as tissue optical properties are performed pre‐ and post‐treatment. Then, this information is incorporated into a macroscopic model to calculate the photobleaching, PDT dose, and mean [1O2]rx. Changes in tumor volume are tracked following the treatment and compared with the dose metrics. The correlation demonstrates that mean [1O2]rx serves as a better dosimetric quantity for predicting treatment outcome and a clinically relevant tumor re‐growth endpoint.
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