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Articles from Wiley

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The latest papers in ChemPubSoc Europe
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Characterization and Reactivity of a Tetrahedral Copper(II) Alkylperoxido Complex

1 agosto, 2019 - 00:00

Double action: A CuII alkylperoxido complex exhibiting an unusual tetrahedral geometry has been prepared and characterized by several spectroscopic methods. The complex exhibits C−H and O−H bond activation reactivity towards 1,4-cyclohexadiene and phenol derivatives (see scheme). Mechanistic details are explored by kinetic analysis and DFT calculations, providing important insights into the reactivity of the bioinspired CuII peroxido complex.

[Full Papers]
Ikuma Shimizu, Dr. Yuma Morimoto, Dr. Gunasekaran Velmurugan, Dr. Tulika Gupta, Dr. Sayantan Paria, Dr. Takehiro Ohta, Dr. Hideki Sugimoto, Prof. Takashi Ogura, Prof. Peter Comba, Prof. Shinobu Itoh
doi.org/10.1002/chem.201902669

Allosteric Modulators of Potential Targets Related to Alzheimer's Disease: a Review

1 agosto, 2019 - 00:00

Targeting the other: The search for allosteric modulators of biological targets related to Alzheimer′s disease (AD) is a key strategy in current approaches to develop drug candidates for the treatment of AD. The purpose of this review is to provide an overview of compounds that act as allosteric modulators of the main biological targets related to AD.

[Reviews]
Guilherme Martins Silva, Mariana Pegrucci Barcelos, João Gabriel Curtolo Poiani, Prof. Dr. Lorane Izabel da Silva Hage-Melim, Prof. Dr. Carlos Henrique Tomich de Paula da Silva
doi.org/10.1002/cmdc.201900299

Biomimetic Extreme-Temperature- and Environment-Adaptable Hydrogels

1 agosto, 2019 - 00:00

Temperature-resistant hydrogels that can withstand cold and arid environments without degradation of their properties can be fabricated by a variety of strategies. Here, recent fabrication routes for anti-freezing, non-drying hydrogels are reviewed. The merits and drawbacks of the materials are discussed and possible applications in flexible electronics are highlighted. The authors also point out future challenges to elucidate the great potential of this juvenile research area.

[Reviews]
Dan Zhou, Fan Chen, Prof. Dr. Stephan Handschuh-Wang, Dr. Tiansheng Gan, Prof. Dr. Xiaohu Zhou, Prof. Dr. Xuechang Zhou
doi.org/10.1002/cphc.201900545

Understanding the Oxygen Reduction Reaction Activity and Oxidative Stability of Pt Supported on Nb-Doped TiO<sub>2</sub>

1 agosto, 2019 - 00:00

“Pt/NTO is shown to exhibit significantly greater activity than the benchmark Pt/C catalysts…” This and more about the story behind the research that inspired the Cover image is presented in the Cover Profile. Read the full text of the corresponding research at 10.1002/cssc.201900499. View the Front Cover here: 10.1002/cssc.201902005.

[Cover Profile]
Cheng He, Dr. Shrihari Sankarasubramanian, Dr. Ivana Matanovic, Prof. Plamen Atanassov, Prof. Vijay Ramani
doi.org/10.1002/cssc.201902006

Transformation of Levulinic Acid to Valeric Biofuels: A Review on Heterogeneous Bifunctional Catalytic Systems

1 agosto, 2019 - 00:00

Upgrading acids: The cascade transformation of levulinic acid to valeric biofuels consists of a series of acid- and metal-catalyzed processes alternately. Herein, the conversion pathway and bifunctional catalytic systems for the cascade transformation and one-pot processes are reviewed. Additionally, effects of active sites and coke deposition on the catalytic performance are also discussed to seek strategies for improvement.

[Minireviews]
Zhihao Yu, Dr. Xuebin Lu, Jian Xiong, Dr. Na Ji
doi.org/10.1002/cssc.201901522

Preparation of Zn(Fe<i><sub>x</sub></i>Ga<sub>1-<i>x</i></sub>)<sub>2</sub>O<sub>4</sub> Solid Solutions as Photocatalyst for CO<sub>2</sub> Reduction under Simulated Solar-Light Irradiation

1 agosto, 2019 - 00:00

We report the first study on Zn(FexGa1-x)2O4 for CO2 photoreduction driven by simulated solar-light irradiation. The Valence band top and conduction band bottom of Zn(FexGa1-x)2O4 could be adjusted by the doping amount of Fe3+. ZnFe0.1Ga1.9O4 has the optimum Fe3+ content that ensures maximum photocatalytic capability under solar-light irradiation.

[Communications]
Qiaoqi Li, Lili Zhang, Chao Tang, Jingzhou Yin
doi.org/10.1002/ejic.201900468

Formation of 10/12/14-Membered Rings is Favored over 5/6/7-Membered. An Unexpected Result from Oxazole Chemistry

1 agosto, 2019 - 00:00

Base-promoted cyclization of N-Boc-(4-(chloromethyl)oxazol-5-yl)alkylamines results in preferable formation of fused 10-, 12-, and 14-membered rings over the corresponding 5-, 6-, and 7-membered ones.

[Communications]
Evgeniy Y. Slobodyanyuk, Yulia L. Berezowska, Vitaliy V. Solomin, Dmitriy M. Volochnyuk, Alexander B. Rozhenko, Sergey V. Ryabukhin, Oleksandr O. Grygorenko
doi.org/10.1002/ejoc.201900914

Macrocyclic Pseudopeptides Having Proline or Pipecolic Acid Residues. Efficient Synthesis via Ugi-Click Strategy

1 agosto, 2019 - 00:00

Ugi-Click strategy was implied for synthesis of pseudopeptides containing proline and pipecolic acid residues. Described approach allows to obtain monomeric and dimeric macrocycles depending on the rigidity of the structural fragments.

[Full Papers]
Irina V. Kutovaya, Elena A. Zakharova, Olga I. Shmatova, Valentine G. Nenajdenko
doi.org/10.1002/ejoc.201900780

Copper-Catalyzed Decarboxylative C(sp<sup>2</sup>)-C(sp<sup>3</sup>) and C(sp)-C(sp<sup>3</sup>) Coupling of Substituted Cinnamic Acids and 3-Phenyl Propiolic Acid with N-Tosyl Oxaziridines

1 agosto, 2019 - 00:00

We describe the copper-catalyzed decarboxylative alkylation of substituted cinnamic acids using N-Tosyl oxaziridines with high yields and excellent stereoselectivities. The (E)-alkene was achieved as the sole isomer in a single step. Our protocol also gives an efficient approach for the construction of alkyl phenyl acetylenes without oxidants and bases. Initial investigation suggested a radical process was involved.

[Full Papers]
Bich-Ngoc Nguyen, Hai-Thuong Cao
doi.org/10.1002/ejoc.201900982

Comparison of Iridium(I) Catalysts in Temperature Mediated Hydrogen Isotope Exchange Reactions

1 agosto, 2019 - 00:00

T for tuning! The reactivity and selectivity of iridium(I) catalyzed hydrogen isotope exchange (HIE) reactions can be varied by using a wide range of reaction temperatures, −80 °C to 130 °C.

[Full Papers]
Mégane Valero, Dr. Anurag Mishra, Jennifer Blass, Remo Weck, Dr. Volker Derdau
doi.org/10.1002/open.201900204

Transaminase-Catalyzed Continuous Synthesis of Biogenic Aldehydes

26 luglio, 2019 - 00:00

Don't stop moving! A transaminase-mediated single-step process in continuous mode leads to excellent biogenic aldehyde yields (90-95 %), starting from the corresponding commercially available amines. Coimmobilization of the pyridoxal phosphate (PLP) cofactor eliminated the need for the exogenous addition of this reagent, without affecting the longevity of the system; thus delivering a truly self-sufficient process.

[Communications]
Dr. Martina L. Contente, Prof. Francesca Paradisi
doi.org/10.1002/cbic.201900356

Biosynthetic Short Neuropeptides: A Rational Theory Based on Experimental Results for the Missing Pain-Relief Opioid Endomorphin Precursor Gene

26 luglio, 2019 - 00:00

Search for the missing link: Endomorphins are neuropeptides isolated from bovine brains, the precursor genes of which have not been identified. A preproendomorphin-like precursor peptide gene, containing nucleotide sequences of two genes predicted by automated gene prediction algorithms, has been cloned.

[Concepts]
Dr. Ayami Matsushima, Dr. Jun Sese, Dr. Kanako O. Koyanagi
doi.org/10.1002/cbic.201900317

Single-step Conversion of Methyl Ethyl Ketone to Olefins over Zn<sub>x</sub>Zr<sub>y</sub>O<sub>z</sub> Catalysts in Water

26 luglio, 2019 - 00:00

“ A portfolio of catalytic and enabling technologies ” This and more about the story behind the research featured on the front cover can be found in this issue's Cover Profile. Read the full text of the corresponding research at https://doi.org/10.1002/cctc.201900292.

[Cover Profile]
Dr. Vanessa L. Dagle, Robert A. Dagle, Dr. Libor Kovarik, Dr. Frederick Baddour, Dr. Susan E. Habas, Richard Elander
doi.org/10.1002/cctc.201901126

Reaction Conditions-Dependent Formation of Catalytically Active Palladium Complexes or Palladium Nanoparticles on a Silica Support

26 luglio, 2019 - 00:00

Grade does matter: palladium nanoparticles may form instead of Pd2+ complexes supported on ligand-modified silica surface depending on the preparation conditions, and these nanoparticles may be responsible for the catalytic properties of the resulting materials.

[Full Papers]
Dr. Megan Bornstein, David M. Parker, Dr. Arthur D. Quast, Prof. Jennifer S. Shumaker-Parry, Prof. Ilya Zharov
doi.org/10.1002/cctc.201900943

Facile Access to Challenging <i>ortho</i>-Terphenyls via Merging Two Multi-Step Domino Reactions in One-Pot: A Joint Experimental/Theoretical Study

26 luglio, 2019 - 00:00

Two steps, three steps: A straightforward synthesis of difficult to access ortho-terphenyls via joining two-step and three-step domino reactions in a one-pot process, is presented. Overcoming necessity to isolate intermediate products leads to a reduction of energy, costs and waste for a broad scope of reactions. DFT calculations have been performed to investigate this facile five-step one-pot process.

[Full Papers]
Benedikt W. Grau, Simon Bönisch, Alexander Neuhauser, Dr. Frank Hampel, Prof. Dr. Andreas Görling, Prof. Dr. Svetlana B. Tsogoeva
doi.org/10.1002/cctc.201900746

Carbidisation of Pd Nanoparticles by Ethene Decomposition with Methane Production

26 luglio, 2019 - 00:00

Carbide controversy! Palladium carbide is an elusive substance in that the stoichiometry of the material is disputed. Here we show, by using chemical titration in addition to spectroscopy and structural analysis, that we can determine that stoichiometry to be close to Pd4C. This is formed by reaction with ethene at elevated temperatures between 200 and 300 °C with a silica supported Pd catalyst. The reaction with Pd occurs via two routes - dehydrogenation and a disproportionation reaction that also forms methane.

[Full Papers]
Wilm Jones, Peter. P. Wells, Emma K. Gibson, Arunabhiram Chutia, Ian P. Silverwood, C. Richard A. Catlow, Michael Bowker
doi.org/10.1002/cctc.201900795

Effect of Carbon Support on the Electrocatalytic Properties of Pt−Ru Catalysts

26 luglio, 2019 - 00:00

Choose your carbon wisely: The effect of carbon support on the performance of anodic electrodes for polymer electrolyte membrane fuel cells (PEMFCs) is studied. The results show that the crystalline phase and the point of zero charge (pzc) of the carbon supports play an important role in the metal particle size and consequently in the catalyst electrocatalytic activity.

[Articles]
Bjorn Hasa, Eftychia Martino, John Vakros, George Trakakis, Costas Galiotis, Dr. Alexandros Katsaounis
doi.org/10.1002/celc.201900566

Nickel Phosphinidene Molecular Clusters from Organocyclophosphine Precursors

26 luglio, 2019 - 00:00

A family of nickel phosphinidene molecular clusters was formed by the reaction of [Ni(cod)2] (cod=1,5-cyclooctadiene) with organocyclophosphine and trialkylphosphine. This work shows that cyclic organocyclophosphines can be used as a precursor for making charge-neutral molecular clusters passivated by two-electron-donor capping ligands (see scheme).

[Communications]
Evan A. Doud, Chiara J. Butler, Dr. Daniel W. Paley, Prof. Xavier Roy
doi.org/10.1002/chem.201903053

Gold Sulfonium Benzylide Complexes Undergo Efficient Benzylidene Transfer to Alkenes

26 luglio, 2019 - 00:00

Gold sulfonium benzylide complexes undergo facile and efficient benzylidene transfer to alkenes through the intermediacy of a cationic gold benzylidene complex.

[Communications]
Robert G. Carden, Prof. Ross A. Widenhoefer
doi.org/10.1002/chem.201902845

Intramolecular Nitrene Insertion into Saturated C−H-Bond-Mediated C−N Bond Cleavage of a Coordinated NHC Ligand

26 luglio, 2019 - 00:00

N ligands: C−N bond cleavage of a coordinated N-heterocyclic carbene (NHC), following an intramolecular nitrene C(sp3)−H insertion, has been observed by reaction of PhI=NR with RuII-NHC complexes 1 bearing a tridentate bis(NHC) ligand, resulting in formation of RuII-imine complexes 2 (see scheme).

[Communications]
Dr. Yungen Liu, Dr. Chun-Wai Tse, Dr. Kar-Yee Lam, Dr. Xiao-Yong Chang, Dr. Xiangguo Guan, Meng-Yao Chao, Dr. Jie-Sheng Huang, Prof. Dr. Chi-Ming Che
doi.org/10.1002/chem.201903012

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