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Articles from Wiley

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The latest chemistry from ChemPubSoc Europe and Wiley-VCH
Aggiornato: 27 settimane 5 giorni fa

Deciphering the Nature of Enzymatic Modifications of Bacterial Cell Walls

25 luglio, 2017 - 00:00

Deciphering the Nature of Enzymatic Modifications of Bacterial Cell Walls

Modifying cell walls: Homogeneous and heterogeneous octasaccharide peptidoglycans were synthesized for characterization of reactions of seven enzymes that modify the bacterial cell wall: SltB1, MltB, RlpA, mutanolysin, AmpDh2, AmpDh3, and PBP5. Three lytic transglycosylases and mutanolysin exhibited broadly distinct preferences for their substrate peptidoglycans in the reactions that they catalyze.

[Communication]
Mijoon Lee, Dusan Hesek, Elena Lastochkin, David A. Dik, Bill Boggess, Shahriar Mobashery
ChemBioChem, July 25, 2017, https://doi.org/10.1002/cbic.201700293 Read article

Mutation of Conserved Residues Increases in Vitro Activity of the Formylglycine-Generating Enzyme

25 luglio, 2017 - 00:00

Mutation of Conserved Residues Increases in Vitro Activity of the Formylglycine‐Generating Enzyme

FGE7—an efficient and practical tool for bioconjugation: The formylglycine-generating enzyme (FGE) converts specific cysteine residues in client proteins into formylglycine. These aldehyde functions provide unique handles for selective protein labeling. We have identified an FGE variant that is thermostable, easy to produce, and 40 times more active than the wild type.

[Full Paper]
Matthias Knop, Roxana Lemnaru, Florian P. Seebeck
ChemBioChem, July 25, 2017, https://doi.org/10.1002/cbic.201700174 Read article

Front Cover: Homogeneous Catalysis by Manganese-Based Pincer Complexes (Eur. J. Org. Chem. /2017)

24 luglio, 2017 - 00:00

 Homogeneous Catalysis by Manganese‐Based Pincer Complexes (Eur. J. Org. Chem. /2017)

The cover picture shows the opening of a new chapter in the field of pincer and pincer-type complexes: “Manganese Pincer Complexes”. After ruthenium, iridium, and iron-based pincer-type complexes have been established as state-of-the-art catalysts for (de)hydrogenation reactions in the past decade, manganese pincer complexes have most recently been successfully applied in related transformations. Details on their recent progress in (de)hydrogenation and transfer (de)hydrogenation as well as in C–C and C–X bond-forming reactions are presented in the Microreview by M. Beller et al. on page -- ff (https://doi.org/10.1002/ejoc.201700376).

[Front Cover]
Marcel Garbe, Kathrin Junge, Matthias Beller
Eur. J. Org. Chem., July 24, 2017, https://doi.org/10.1002/ejoc.201701015 Read article

Design and Synthesis of Spirocycles

24 luglio, 2017 - 00:00

Design and Synthesis of Spirocycles

In this personal account, a variety of spirocycles were constructed by sequential use of metathesis and cycloaddition reactions along with different name reactions such as Claisen rearrangement (CR), Grignard addition, Fischer indolization (FI), Suzuki–Miyaura (SM) cross-coupling and the retro-Diels–Alder (rDA) reaction as key steps.

[Microreview]
Sambasivarao Kotha, Nageswara Rao Panguluri, Rashid Ali
Eur. J. Org. Chem., July 24, 2017, https://doi.org/10.1002/ejoc.201700439 Read article

Unsymmetrical Diborane(4) Derivatives: A Comparative Study

24 luglio, 2017 - 00:00

 A Comparative Study

The synthesis of four novel unsymmetrical diborane(4) derivatives and their spectroscopic and structural characterization is reported. These data allow the first comparative study within this class of compounds.

[Full Paper]
Corinna Borner, Maximilian T. Wiecha, Christian Kleeberg
Eur. J. Inorg. Chem., July 24, 2017, https://doi.org/10.1002/ejic.201700545 Read article

Prominent Electron Penetration through Ultrathin Graphene Layer from FeNi Alloy for Efficient Reduction of CO<sub>2</sub> to CO

24 luglio, 2017 - 00:00

Prominent Electron Penetration through Ultrathin Graphene Layer from FeNi Alloy for Efficient Reduction of CO2 to CO

FeNi, vidi, vici: Electron penetration through ultrathin graphene layer from inner metal alloy modulates the surface electronic properties of core–shell nanoparticles. Catalytic reduction of carbon dioxide at relatively low temperature is significantly boosted by this electron-tuned catalyst, presenting an efficient and reliable route to clean CO generation, low-carbon resource utilization, and energy supply.

[Communication]
Qingyuan Bi, Xin Wang, Feng Gu, Xianlong Du, Hongliang Bao, Guoheng Yin, Jianjun Liu, Fuqiang Huang
ChemSusChem, July 24, 2017, https://doi.org/10.1002/cssc.201700787 Read article

Direct Insight into Ethane Oxidative Dehydrogenation over Boron Nitrides

24 luglio, 2017 - 00:00

Direct Insight into Ethane Oxidative Dehydrogenation over Boron Nitrides

DOS and don'ts of dehydrogenation: In the dehydrogenation of alkanes, conventional metal-based catalysts enable the dissociation of O2 into dissociative oxygen species (DOS), and thereby the C−H bonds can be easily activated; however, DOS inevitably overoxidize the alkanes to CO2. Adsorbed O2 at the edges of boron nitride can abstract a hydrogen atom from ethane to deliver the corresponding alkene with 100 % selectivity (S).

[Communication]
Rui Huang, Bingsen Zhang, Jia Wang, Kuang-Hsu Wu, Wen Shi, Yajie Zhang, Yuefeng Liu, Anmin Zheng, Robert Schlögl, Dang Sheng Su
ChemCatChem, July 24, 2017, https://doi.org/10.1002/cctc.201700725 Read article

A Continuous-Flow Process for Palladium-Catalyzed Olefin Cleavage by using Oxygen within the Explosive Regime

24 luglio, 2017 - 00:00

A Continuous‐Flow Process for Palladium‐Catalyzed Olefin Cleavage by using Oxygen within the Explosive Regime

On break: The development of a continuous-flow protocol for Pd-catalyzed olefin cleavage by using molecular oxygen as the sole oxidant to give carbonyl compounds is described. The applicability of the continuous-flow protocol is demonstrated on several olefin substrates. The continuous-flow process enables safe and scalable olefin cleavage by using pure O2. MFC= mass-flow controller, PTSA=p-toluenesulfonic acid, PEG400=poly(ethylene glycol) 400, 1 bar=0.1 MPa.

[Communication]
Christopher A. Hone, Anne O'Kearney-McMullan, Rachel Munday, C. Oliver Kappe
ChemCatChem, July 24, 2017, https://doi.org/10.1002/cctc.201700671 Read article

One-Pot Biocatalytic Double Oxidation of α-Isophorone for the Synthesis of Ketoisophorone

24 luglio, 2017 - 00:00

One‐Pot Biocatalytic Double Oxidation of &#x3B1;‐Isophorone for the Synthesis of Ketoisophorone

Design of an enzymatic cascade: For the first biocatalytic one-pot double oxidation of &#x3B1;-isophorone to ketoisophorone, variants of the self-sufficient P450cam-RhFRed with improved activity are combined with Cm-ADH10 from Candida magnoliae. The reaction shows a productivity of up to 1.4 g L−1 d−1.

[Full Paper]
Michele Tavanti, Fabio Parmeggiani, J. Rubén Gómez Castellanos, Andrea Mattevi, Nicholas J. Turner
ChemCatChem, July 24, 2017, https://doi.org/10.1002/cctc.201700620 Read article

Palladium Copper Chromium Ternary Nanoparticles Constructed In situ within a Basic Resin: Enhanced Activity in the Dehydrogenation of Formic Acid

24 luglio, 2017 - 00:00

 Enhanced Activity in the Dehydrogenation of Formic Acid

Three's a crowd: PdCuCr ternary nanoparticles constructed in situ within a macroreticular basic resin act as a simple and efficient heterogeneous catalyst for the dehydrogenation of formic acid.

[Full Paper]
Kohsuke Mori, Kohei Naka, Shinya Masuda, Kohei Miyawaki, Hiromi Yamashita
ChemCatChem, July 24, 2017, https://doi.org/10.1002/cctc.201700595 Read article

Selective Fe Promotion on Au Nanoparticles: An Efficient Way to Activate Au/SiO<sub>2</sub> Catalysts for the CO Oxidation Reaction

24 luglio, 2017 - 00:00

 An Efficient Way to Activate Au/SiO2 Catalysts for the CO Oxidation Reaction

Postpromotion with iron: Trace amount of Fe promoters selectively decorated on the Au surface efficiently activate an inactive Au/SiO2 catalyst for CO oxidation. After oxidation of Fe2+ to Fe3+, Au nanoparticles collect the hydrolysis products of Fe3+ through a heterogeneous nucleation/growth mechanism and an electrostatic adsorption mechanism.

[Full Paper]
Chunzheng Wu, Giovanni Bertoni, Sergio Marras, Liberato Manna, Massimo Colombo
ChemCatChem, July 24, 2017, https://doi.org/10.1002/cctc.201700533 Read article

Iron and Cobalt Corroles in Solution and on Carbon Nanotubes as Molecular Photocatalysts for Hydrogen Production by Water Reduction

24 luglio, 2017 - 00:00

Iron and Cobalt Corroles in Solution and on Carbon Nanotubes as Molecular Photocatalysts for Hydrogen Production by Water Reduction

Tubular potential: Cobalt and iron corrole complexes have been used as catalysts of H2O reduction to generate H2. Electro- and photocatalysis of water reduction occurred with dissolved corroles. Carbon nanotubes doped with corroles were used as photo-electrochemical catalysts with increased hydrogen production. The catalytic efficiency increased by five orders of magnitude if the molecular catalysts were adsorbed onto the carbon nanotubes.

[Full Paper]
Miguel A. Morales Vásquez, Mariana Hamer, Nicolás I. Neuman, Alvaro Y. Tesio, Andrés Hunt, Horacio Bogo, Ernesto J. Calvo, Fabio Doctorovich
ChemCatChem, July 24, 2017, https://doi.org/10.1002/cctc.201700349 Read article

Analysis of the Magnetic Entropy in Oxygen Reduction Reactions Catalysed by Manganite Perovskites

24 luglio, 2017 - 00:00

Analysis of the Magnetic Entropy in Oxygen Reduction Reactions Catalysed by Manganite Perovskites

The impact of magnetic ordering: The La0.67Sr0.33MnO3 (LSMO) perovskite system illustrates the influence of the spin-entropy below the Curie temperature in the oxygen reduction reactions. As shown by transition-state theory, the hindrance resulting from the magnetic entropy is minimum for the initial reduction of O2 by two antiparallel electrons to diamagnetic intermediates.

[Full Paper]
Jose Gracia, Julen Munarriz, Victor Polo, Ryan Sharpe, Yunzhe Jiao, J. W. (Hans) Niemantsverdriet, Tingbin Lim
ChemCatChem, July 24, 2017, https://doi.org/10.1002/cctc.201700302 Read article

Synthesis of a Bioreversibly Masked Lipophilic Adenosine Diphosphate Ribose Derivative

24 luglio, 2017 - 00:00

Synthesis of a Bioreversibly Masked Lipophilic Adenosine Diphosphate Ribose Derivative

Sugar nucleotide delivery systems: Lipophilic ADPR analogues were prepared bearing acetyl protecting groups together with a designed biodegradable group at only one of the phosphate moieties. The compounds showed high stability in PBS (pH 7.3) but enzymatic hydrolysis revealed that the unmasked ADPR was ultimately formed.

[Full Paper]
Katharina Pahnke, Chris Meier
ChemBioChem, July 24, 2017, https://doi.org/10.1002/cbic.201700232 Read article

Synthetic Nucleic Acid Analogues in Gene Therapy: An Update for Peptide–Oligonucleotide Conjugates

24 luglio, 2017 - 00:00

 An Update for Peptide–Oligonucleotide Conjugates

Greater than the sum of its parts: The field of therapeutic oligonucleotides is growing constantly, which provides exciting opportunities in life sciences and clinical research. Recent developments in the synthesis and biological properties of conjugates formed by oligonucleotides and peptides is described, with special attention to the delivery of nucleic acid therapeutics.

[Review]
Maria Taskova, Anna Mantsiou, Kira Astakhova
ChemBioChem, July 24, 2017, https://doi.org/10.1002/cbic.201700229 Read article

Dendrimer-Based Signal Amplification of Click-Labelled DNA in Situ

24 luglio, 2017 - 00:00

Dendrimer‐Based Signal Amplification of Click‐Labelled DNA in Situ

Finding a needle in a haystack: A new method to detect proliferating cells in situ by using multiple consecutive click reactions with dendrimeric molecules and clickable dyes is presented. These assays have outstanding sensitivities; signal intensities and signal-to-noise ratios are far better than those obtained by techniques that are currently available. EdU=ethinyl-dU.

[Communication]
Nada Raddaoui, Samuele Stazzoni, Leonhard Möckl, Bastien Viverge, Florian Geiger, Hanna Engelke, Christoph Bräuchle, Thomas Carell
ChemBioChem, July 24, 2017, https://doi.org/10.1002/cbic.201700209 Read article

Synthesis and Reactivity of Iron– and Cobalt–Dinitrogen Complexes Bearing PSiP-Type Pincer Ligands toward Nitrogen Fixation

21 luglio, 2017 - 00:00

Synthesis and Reactivity of Iron– and Cobalt–Dinitrogen Complexes Bearing PSiP‐Type Pincer Ligands toward Nitrogen Fixation

Read more about the story behind the cover in the Cover Profile and about the research itself on page -- ff (https://doi.org/10.1002/ejic.201700569).

[Cover Profile]
Ryuji Imayoshi, Kazunari Nakajima, Jun Takaya, Nobuharu Iwasawa, Yoshiaki Nishibayashi
Eur. J. Inorg. Chem., July 21, 2017, https://doi.org/10.1002/ejic.201700863 Read article

Front Cover: Synthesis and Reactivity of Iron– and Cobalt–Dinitrogen Complexes Bearing PSiP-Type Pincer Ligands toward Nitrogen Fixation (Eur. J. Inorg. Chem. /2017)

21 luglio, 2017 - 00:00

 Synthesis and Reactivity of Iron– and Cobalt–Dinitrogen Complexes Bearing PSiP‐Type Pincer Ligands toward Nitrogen Fixation (Eur. J. Inorg. Chem. /2017)

The cover picture shows the newly designed iron– and cobalt–dinitrogen complexes bearing PSiP-type pincer ligands, which work as effective catalysts for the transformation of molecular dinitrogen into silylamine as ammonia equivalent under ambient reaction conditions. We believe that these results contribute to the further development of the catalytic transformation of molecular dinitrogen with transition metal dinitrogen complexes as catalysts under mild reaction conditions. Details are discussed in the article by Y. Nishibayashi et al. on page -- ff (https://doi.org/10.1002/ejic.201700569). For more on the story behind the cover research, see the Cover Profile (https://doi.org/10.1002/ejic.201700863).

[Cover Picture]
Ryuji Imayoshi, Kazunari Nakajima, Jun Takaya, Nobuharu Iwasawa, Yoshiaki Nishibayashi
Eur. J. Inorg. Chem., July 21, 2017, https://doi.org/10.1002/ejic.201700862 Read article

Switchable Dielectric Constant in the Cyanometalate-Based Hydrogen-Bonded [(CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub>]<sub>2</sub>(H<sub>3</sub>O)[Co(CN)<sub>6</sub>] Framework

21 luglio, 2017 - 00:00

Switchable Dielectric Constant in the Cyanometalate‐Based Hydrogen‐Bonded [(CH3)2NH2]2(H3O)[Co(CN)6] Framework

Read more about the story behind the cover in the Cover Profile and about the research itself on page -- ff (https://doi.org/10.1002/ejic.201700469).

[Cover Profile]
Chao Shi, Ya Wang, Xiang-Bin Han, Wen Zhang
Eur. J. Inorg. Chem., July 21, 2017, https://doi.org/10.1002/ejic.201700861 Read article

Front Cover: Switchable Dielectric Constant in the Cyanometalate-Based Hydrogen-Bonded [(CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub>]<sub>2</sub>(H<sub>3</sub>O)[Co(CN)<sub>6</sub>] Framework (Eur. J. Inorg. Chem. /2017)

21 luglio, 2017 - 00:00

 Switchable Dielectric Constant in the Cyanometalate‐Based Hydrogen‐Bonded [(CH3)2NH2]2(H3O)[Co(CN)6] Framework (Eur. J. Inorg. Chem. /2017)

The cover picture shows the distinct dielectric transitions in typical host–guest organic–inorganic frameworks. The changes in the motions of the confined guests in the host frameworks are responsible for the thermally driven switchable dielectric constant. The background is one of spectacular natural scenery, seas of clouds, on the Yellow Mountains, one of the most famous mountainous areas in China and a UNESCO World Heritage Site since 1990. Details are discussed in the Communication by W. Zhang et al. on page -- ff (https://doi.org/10.1002/ejic.201700469). For more on the story behind the cover research, see the Cover Profile (https://doi.org/10.1002/ejic.201700861).

[Cover Picture]
Chao Shi, Ya Wang, Xiang-Bin Han, Wen Zhang
Eur. J. Inorg. Chem., July 21, 2017, https://doi.org/10.1002/ejic.201700860 Read article

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