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Articles from Wiley

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The latest chemistry from ChemPubSoc Europe and Wiley-VCH
Aggiornato: 10 settimane 6 giorni fa

Doping Copper Ions into an Fe/N/C Composite Promotes Catalyst Performance for the Oxygen Reduction Reaction

7 aprile, 2017 - 00:00

Doping Copper Ions into an Fe/N/C Composite Promotes Catalyst Performance for the Oxygen Reduction Reaction

Top performer: A two-step method is employed to prepare Fe, Cu, and N-doped rGO/CNT composites as efficient and stable electrocatalysts for the oxygen reduction reaction (ORR). Additional doping of Cu ions into the Fe/N/C catalyst significantly promotes the catalyst ORR performance.

[Article]
Guo-Qiang Yu, Ping-Jie Wei, Fei-Fei Wang, Jin-Gang Liu
ChemElectroChem, April 07, 2017, https://doi.org/10.1002/celc.201600904 Read article

Carbon Dioxide Oversolubility in Nanoconfined Liquids for the Synthesis of Cyclic Carbonates

7 aprile, 2017 - 00:00

Carbon Dioxide Oversolubility in Nanoconfined Liquids for the Synthesis of Cyclic Carbonates

Solving the problem: The physical phenomenon of gas oversolubility in nanoconfined liquids is applied for the catalytic cycloaddition of carbon dioxide to epoxides to generate cyclic carbonates at room temperature under atmospheric pressure. A hybrid adsorbent based on the MCM-41 silica material exhibits enhanced catalytic properties and multicycle stability, providing an effective and sustainable catalytic system.

[Communication]
Maria V. Zakharova, Freddy Kleitz, Frédéric-Georges Fontaine
ChemCatChem, April 07, 2017, https://doi.org/10.1002/cctc.201700247 Read article

Self-assembly- and Preshaping-assisted Synthesis of Molybdenum Carbide Supported on Ultrathin Nitrogen-doped Graphitic Carbon Lamellas for the Hydrogen Evolution Reaction

7 aprile, 2017 - 00:00

Self‐assembly‐ and Preshaping‐assisted Synthesis of Molybdenum Carbide Supported on Ultrathin Nitrogen‐doped Graphitic Carbon Lamellas for the Hydrogen Evolution Reaction

In control: The controllable synthesis of highly dispersed Mo2C nanoparticles supported on porous graphitic carbon lamellas is reported. Serious overlapping of carbon and excessive growth of Mo2C are prevented, and Mo2C/C has a 2 D lamellar structure even after high-temperature carburization. The constructed Mo2C/C-lamellas exhibits higher activity in the hydrogen evolution reaction than traditional bulk Mo2C/C and shows long-term stability.

[Communication]
Lishan Peng, Yao Nie, Ling Zhang, Rui Xiang, Jun Wang, Hongmei Chen, Ke Chen, Zidong Wei
ChemCatChem, April 07, 2017, https://doi.org/10.1002/cctc.201700239 Read article

Aerobic Oxidation of Alkynes to 1,2-Diketones by Organic Photoredox Catalysis

7 aprile, 2017 - 00:00

Aerobic Oxidation of Alkynes to 1,2‐Diketones by Organic Photoredox Catalysis

Photo op: A method for the synthesis of 1,2-diketones through the 9,10-dicyanoanthracene (DCA)-sensitized photooxygenation of alkynes upon visible-light irradiation is reported. Mechanistic studies indicate that a radical-cation intermediate might be involved. The first examples of the transformation of alkynes via acetenyl radical cation intermediates are provided.

[Communication]
Hai-Tao Qin, Xiao Xu, Feng Liu
ChemCatChem, April 07, 2017, https://doi.org/10.1002/cctc.201700061 Read article

Disassembling Metal Nanocrystallites into Sub-nanometric Clusters and Low-faceted Nanoparticles for Multisite Catalytic Reactions

7 aprile, 2017 - 00:00

Disassembling Metal Nanocrystallites into Sub‐nanometric Clusters and Low‐faceted Nanoparticles for Multisite Catalytic Reactions

Disassembled, but working together: Metal nanocrystallites have saturated atoms, in planes, and unsaturated metal atoms, in corners and vertices, which perform different roles in catalysis: both sites are spatially complementary so their number cannot be independently maximized for a catalytic process. However, by independently adding sub-nanometric Au clusters and metallic Au nanoparticles, not only iodo- and bromobenzenes, but also chlorobenzenes can react with a wide variety of alkynes in the Sonogashira reaction, outperforming any previous Au catalyst and ligand-free Pd and Cu catalysts.

[Full Paper]
Judit Oliver-Meseguer, Irene Dominguez, Rafael Gavara, Antonio Leyva-Pérez, Avelino Corma
ChemCatChem, April 07, 2017, https://doi.org/10.1002/cctc.201700037 Read article

Supercritical Antisolvent Precipitation of Amorphous Copper–Zinc Georgeite and Acetate Precursors for the Preparation of Ambient-Pressure Water-Gas-Shift Copper/Zinc Oxide Catalysts

7 aprile, 2017 - 00:00

Supercritical Antisolvent Precipitation of Amorphous Copper–Zinc Georgeite and Acetate Precursors for the Preparation of Ambient‐Pressure Water‐Gas‐Shift Copper/Zinc Oxide Catalysts

Water gives performance: Cu/ZnO catalyst precursors are prepared by supercritical CO2 antisolvent precipitation with water addition effecting the meso- and nanostructure of the resulting material. Optimum catalysts are derived from zincian georgeite, which thermally decompose mildly to give highly dispersed metal-oxide crystallites inside a carbonate matrix.

[Full Paper]
Paul J. Smith, Simon A. Kondrat, James H. Carter, Philip A. Chater, Jonathan K. Bartley, Stuart H. Taylor, Michael S. Spencer, Graham J. Hutchings
ChemCatChem, April 07, 2017, https://doi.org/10.1002/cctc.201601603 Read article

Spectroscopic and Computational Investigations of Ligand Binding to IspH: Discovery of Non-diphosphate Inhibitors

7 aprile, 2017 - 00:00

 Discovery of Non‐diphosphate Inhibitors

ISO isoprenoid ligands: Using EPR, HYSCORE, and NRVS spectroscopy, together with in silico screening, we investigated how ligands bind to the isoprenoid biosynthesis enzyme IspH. This resulted in the identification of novel barbiturate inhibitors with Ki values as low as 500 nm.

[Communication]
Bing O'Dowd, Sarah Williams, Hongxin Wang, Joo Hwan No, Guodong Rao, Weixue Wang, J. Andrew McCammon, Stephen P. Cramer, Eric Oldfield
ChemBioChem, April 07, 2017, https://doi.org/10.1002/cbic.201700052 Read article

Design and Discovery of New Combinations of Mutant DNA Polymerases and Modified DNA Substrates

7 aprile, 2017 - 00:00

Design and Discovery of New Combinations of Mutant DNA Polymerases and Modified DNA Substrates

Going forward: SFM19, a Taq polymerase variant, can synthesize 2′-modified DNA, but with limited product length. Through a combination of biochemical characterization and rational design, we designed novel mutant DNA polymerases capable of improved enzymatic modified-DNA synthesis.

[Full Paper]
Sydney L. Rosenblum, Aurora G. Weiden, Eliza L. Lewis, Alexie L. Ogonowsky, Hannah E. Chia, Susanna E. Barrett, Mira D. Liu, Aaron M. Leconte
ChemBioChem, April 07, 2017, https://doi.org/10.1002/cbic.201600701 Read article

DNA-Targeted Inhibition of MGMT

7 aprile, 2017 - 00:00

DNA‐Targeted Inhibition of MGMT

A Zn–porphyrin complex, Zn-DIGPor, binds to DNA and protects O6-methylguanine from the DNA repair enzyme O6-methylguanine-DNA methyltransferase. Zn-DIGPor succeeded in potentiating the effects of the anticancer drug temozolomide in an MGMT-expressing cell line. This represents the first example of DNA-targeted MGMT inhibition.

[Communication]
Theodor Marsoner, Olivia P. Schmidt, Therese Triemer, Nathan W. Luedtke
ChemBioChem, April 07, 2017, https://doi.org/10.1002/cbic.201600652 Read article

Easy Access to SCF<sub>2</sub>-Containing Molecules through a Versatile Reagent

6 aprile, 2017 - 00:00

Easy Access to SCF2‐Containing Molecules through a Versatile Reagent

[Communication]
Ermal Ismalaj, Quentin Glenadel, Thierry Billard
Eur. J. Org. Chem., April 06, 2017, https://doi.org/10.1002/ejoc.201700103 Read article

Revisiting the Intermolecular Fujiwara Hydroarylation of Alkynes

6 aprile, 2017 - 00:00

Revisiting the Intermolecular Fujiwara Hydroarylation of Alkynes

The Fujiwara hydroarylation of alkynes was reinvestigated. Reactions were monitored by 1H NMR spectroscopy, by electrospray ionization mass spectrometry (ESI/MS), and through reactions carried out in the gas phase using MS/MS experiments.

[Full Paper]
Marla N. Godoi, Francisco de Azambuja, Pablo David G. Martinez, Nelson H. Morgon, Vanessa G. Santos, Thaís Regiani, Denis Lesage, Heloise Dossmann, Richard B. Cole, Marcos N. Eberlin, Carlos Roque D. Correia
Eur. J. Org. Chem., April 06, 2017, https://doi.org/10.1002/ejoc.201700033 Read article

Exploring “Through-Bond” Proximity between the Ion Tag and Reaction Site of an Imidazolium-Proline Catalyst for the Direct Asymmetric Aldol Reaction

6 aprile, 2017 - 00:00

Exploring “Through‐Bond” Proximity between the Ion Tag and Reaction Site of an Imidazolium‐Proline Catalyst for the Direct Asymmetric Aldol Reaction

Proline tagged with an imidazolium moiety at C-4, cis to COOH, has been synthesised and explored as catalyst for the direct asymmetric aldol reaction in the presence of water under solvent-free conditions. The study further establishes the role of ionic moieties in the enamine route to enantiopure aldol adducts and offers insight on the effect of the proximity of the ion tag to the reaction site.

[Full Paper]
Meeta Bhati, Shruti Upadhyay, Srinivasan Easwar
Eur. J. Org. Chem., April 06, 2017, https://doi.org/10.1002/ejoc.201700021 Read article

A Direct Synthesis of Isocytosine Analogues by Carbonylative Coupling of α-Chloro Ketones and Guanidines

6 aprile, 2017 - 00:00

A Direct Synthesis of Isocytosine Analogues by Carbonylative Coupling of &#x3B1;‐Chloro Ketones and Guanidines

[Full Paper]
Martina Capua, Serena Perrone, Fabio Bona, Antonio Salomone, Luigino Troisi
Eur. J. Org. Chem., April 06, 2017, https://doi.org/10.1002/ejoc.201601654 Read article

<i>N</i>-Sulfonylcarboxamide as an Oxidizing Directing Group for Ruthenium-Catalyzed C–H Activation/Annulation

6 aprile, 2017 - 00:00

N‐Sulfonylcarboxamide as an Oxidizing Directing Group for Ruthenium‐Catalyzed C–H Activation/Annulation

[Full Paper]
Elina Petrova, Dace Rasina, Aigars Jirgensons
Eur. J. Org. Chem., April 06, 2017, https://doi.org/10.1002/ejoc.201601582 Read article

Oxidative Addition of Aryl Halides to Cationic Bis(phosphane)rhodium Complexes: Application in C–C Bond Formation

6 aprile, 2017 - 00:00

 Application in C–C Bond Formation

[Full Paper]
Anja König, Christian Fischer, Elisabetta Alberico, Carmen Selle, Hans-Joachim Drexler, Wolfgang Baumann, Detlef Heller
Eur. J. Inorg. Chem., April 06, 2017, https://doi.org/10.1002/ejic.201700051 Read article

Sorting Graphene Quantum Dots by Using Aluminum Ions

6 aprile, 2017 - 00:00

Sorting Graphene Quantum Dots by Using Aluminum Ions

A facile method to sort as-prepared graphene quantum dots (GQDs) into different sizes with narrow size distributions by using aluminum ions is developed. The mechanism of separation is investigated. The obtained differently sized GQDs exhibit dissimilar cytotoxicity, which suggests that their effects on cells or organisms could be different.

[Communication]
Jingyuan Liu, Fangwei Zhang, Fei Liu, Hui Liu, Jingyan Zhang, Shouwu Guo
Eur. J. Inorg. Chem., April 06, 2017, https://doi.org/10.1002/ejic.201700047 Read article

Sustainable Hypersaline Microbial Fuel Cells: Inexpensive Recyclable Polymer Supports for Carbon Nanotube Conductive Paint Anodes

6 aprile, 2017 - 00:00

 Inexpensive Recyclable Polymer Supports for Carbon Nanotube Conductive Paint Anodes

Paint it black: A recyclable polymeric support is explored as a sustainable and inexpensive material for the development of anode electrodes to be applied in single-chamber microbial fuel cells operated in field under hypersaline conditions. The support is covered with a carbon-nanotube-based conductive paint to allow biofilms to colonize the electrodes and achieve stable power outputs.

[Full Paper]
Matteo Grattieri, Nelson D. Shivel, Iram Sifat, Massimiliano Bestetti, Shelley D. Minteer
ChemSusChem, April 06, 2017, https://doi.org/10.1002/cssc.201700099 Read article

Shortest Double-Walled Carbon Nanotubes Composed of Cycloparaphenylenes

6 aprile, 2017 - 00:00

Shortest Double‐Walled Carbon Nanotubes Composed of Cycloparaphenylenes

Ring sorting: [n]CPPs (n=5, 6, 7, 8, and 10) interact selectively with [n+5]CPPs to form [n+5]CPP⊃[n]CPP complexes, which are the shortest double-walled armchair carbon nanotubes (see figure). The size-selective complex formation illustrates the importance of van der Waals interactions. A ternary complex, [15]CPP⊃[10]CPP⊃C60, is also formed by mixing [15]CPP with [10]CPP⊃C60.

[Communication]
Sigma Hashimoto, Takahiro Iwamoto, Daisuke Kurachi, Eiichi Kayahara, Shigeru Yamago
ChemPlusChem, April 06, 2017, https://doi.org/10.1002/cplu.201700097 Read article

Structure-Based Design and Synthesis of Harmine Derivatives with Different Selectivity Profiles in Kinase versus Monoamine Oxidase Inhibition

6 aprile, 2017 - 00:00

Structure‐Based Design and Synthesis of Harmine Derivatives with Different Selectivity Profiles in Kinase versus Monoamine Oxidase Inhibition

Choosing sides: The different orientations of harmine in the X-ray structures of this natural product bound to DYRK1A and monoamine oxidase A (MAO-A) suggest chemical ways to fine-tune the selectivity profile of this compound class. These structure-guided transformations led to the abolition of DYRK1A and/or MAO-A inhibition in harmine derivatives as well as to the synthesis of dual inhibitors of mixed inhibition ratio.

[Full Paper]
Balázs Bálint, Csaba Wéber, Francisco Cruzalegui, Mike Burbridge, Andras Kotschy
ChemMedChem, April 06, 2017, https://doi.org/10.1002/cmdc.201600539 Read article

Bifunctional Diaminoterephthalate Fluorescent Dye as Probe for Cross-Linking Proteins

6 aprile, 2017 - 00:00

Bifunctional Diaminoterephthalate Fluorescent Dye as Probe for Cross‐Linking Proteins

Fluorescent probes: A bifunctional fluorescent probe with maleimide and cyclooctyne reactive groups was prepared and used for cross-linking proteins.

[Full Paper]
Melanie Wallisch, Stefan Sulmann, Karl-Wilhelm Koch, Jens Christoffers
Chem. Eur. J., April 06, 2017, https://doi.org/10.1002/chem.201700774 Read article

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