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Articles from Wiley

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A Study of Polarization and Directing Effects of Unsymmetrical Alkynes Using Regioselective Pd-Catalyzed Bromoallylation

8 January, 2020 - 00:00

Pd-catalyzed bromoallylation of unsymmetrical alkynes represents a simple approach towards functionalized olefins. The regioselectivity of this process is influenced by the direction of the polarization of the triple bond as well as by directing effects of a coordinating group in the pendant chain.

[Full Papers]
Dr. Nikola Topolovčan, Shuto Hara, Ivana Císařová, Zdeněk Tošner, Prof. Martin Kotora
doi.org/10.1002/ejoc.201901476

Tandem Condensation-Hydrogenation to Produce Alkylated Nitriles Using Bifunctional Catalysts: Platinum Nanoparticles Supported on MOF-Derived Carbon

18 December, 2019 - 00:00

Nanocatalyst for tandem reactions: The development of the recyclable bifunctional catalyst Pt/CN-ZrO2 can effectively catalyze a one-step tandem Knoevenagel condensation-hydrogenation reaction by loading Pt nanoparticles on an amino-functionalized MOF onto N-doped carbon. The Pt/CN-ZrO2 catalyst exhibited excellent catalytic property. This work opens up new avenues for the synthesis of bifunctional metal-N-doped carbon hybrid catalysts for tandem catalysis.

[Full Papers]
Ao Huang, Prof. Renfeng Nie, Biying Zhang, Yuchen Pei, Minda Chen, Ranjan Behera, Jiaqi Yu, Xuechen Luan, Nicholas T. Hunter, Prof. Ming Ke, Prof. Wenyu Huang
doi.org/10.1002/cctc.201901930

Microwave Hydrothermal Synthesis of 1T@2H−MoS<sub>2</sub> as an Excellent Photocatalyst

18 December, 2019 - 00:00

Photocatalysis: A novel microwave hydrothermal method was developed to prepare 1T@2H−MoS2 with the hybrid-phase structure. The photocatalytic mechanism was comprehensively verified by photoelectrochemical measurement, photo-degradation and photo-reduction progresses: 2H phase as photosensitizer, 1T phase as cocatalyst and the synergistic effect between 2H and 1T phases.

[Full Papers]
Haiyang Liu, Prof. Rong Wu, Prof. Hongyan Zhang, Prof. Ming Ma
doi.org/10.1002/cctc.201901569

Effect of Electrolyte Ions on the Formation, Electroactivity, and Rectification Properties of Films Obtained by Electrografting

18 December, 2019 - 00:00

Properties of grafted films: The thickness and compactness of grafted films bearing nitrophenyl groups can be controlled with the size of the supporting electrolyte ions. In addition, small ions improve the reduction behavior of these films whereas big ions intensify the rectification properties of ferrocene as redox probe.

[Articles]
Daniel E. Ramírez-Chan, Dr. Rogelio Fragoso-Soriano, Dr. Felipe J. González
doi.org/10.1002/celc.201901723

Oxygen Evolution Reaction on Single-Walled Carbon Nanotubes Noncovalently Functionalized with Metal Phthalocyanines

18 December, 2019 - 00:00

Exchange program: Single-walled carbon-nanotube-supported metal phthalocyanines hybrids synthesized through an ecologically friendly method have practical applications as electrocatalysts for the oxygen evolution reaction. Nickel, cobalt and iron phthalocyanines reveal auto-activation during cycling or long-term chronoamperometric measurements. The excellent electrocatalytic activity of hybrids obtained and the straightforward method of their synthesis opens the possibility of exploring the proposed materials for applications in anion-exchange membrane water electrolysis.

[Articles]
Dr. Natalia Alzate-Carvajal, Lina M. Bolivar-Pineda, Dr. Victor Meza-Laguna, Prof. Vladimir A. Basiuk, Prof. Elena V. Basiuk, Prof. Elena A. Baranova
doi.org/10.1002/celc.201901708

Cell-Encapsulating Hydrogel Puzzle: Polyrotaxane-Based Self-Healing Hydrogels

18 December, 2019 - 00:00

On the mend: Slide-ring hydrogels with self-healing ability were developed as biomaterials. Human umbilical vein endothelial cells encapsulated in the hydrogel showed increased proliferation. The gel's ability to self-heal promoted this cell proliferation. This highlights the value of using slide-ring hydrogels for biomaterials for soft-tissue engineering.

[Full Papers]
Dr. Ik Sung Cho, Prof. Dr. Tooru Ooya
doi.org/10.1002/chem.201904446

Rationalising Supramolecular Hydrogelation of Bis-Urea-Based Gelators through a Multiscale Approach

18 December, 2019 - 00:00

“Our study shows that it is possible to post-rationalize supramolecular hydrogelation based on computational efforts, which contributes to the fundamental understanding of these materials. An obvious follow-up of this work would be to investigate if it is possible to predict experimental gelation based on the computational techniques used in this work.” Read more about the story behind the cover in the Cover Profile and about the research itself (DOI: 10.1002/cplu.201900551).

[Cover Profile]
Ruben Van Lommel, Laurens A. J. Rutgeerts, Prof. Wim M. De Borggraeve, Prof. Frank De Proft, Prof. Mercedes Alonso
doi.org/10.1002/cplu.201900686

Pyrimidine (6-4) Pyrimidone Photoproducts in UVA-Irradiated DNA: Photosensitization or Photoisomerization?

18 December, 2019 - 00:00

What's the damage? The DNA damage pyrimidine (6-4) pyrimidone photoproduct has been proposed to photosensitize the formation of a cyclobutane pyrimidine dimer. We show that this process is several orders of magnitude less efficient that the well documented formation of Dewar valence isomers.

[Articles]
Dr. Thierry Douki
doi.org/10.1002/cptc.201900280

CoO<sub>x</sub>@Co Nanoparticle-based Catalyst for Efficient Selective Transfer Hydrogenation of α,β-Unsaturated Aldehydes

17 December, 2019 - 00:00

Transfer hydrogenation: A facile ultrasonic-assisted carbothermal reduction method is innovatively utilized to prepare core-shell structured CoOx@Co nanoparticle catalyst as high performance selective transfer hydrogenation catalyst to convert α,β-unsaturated aldehydes into corresponding unsaturated alcohols with over 90 % selectivity.

[Communications]
Dr. Wanbing Gong, Dr. Miaomiao Han, Dr. Chun Chen, Dr. Yue Lin, Prof. Guozhong Wang, Prof. Haimin Zhang, Prof. Huijun Zhao
doi.org/10.1002/cctc.201901996

Stereoselective Biotransformations of Cyclic Imines in Recombinant Cells of <i>Synechocystis</i> sp. PCC 6803

17 December, 2019 - 00:00

Light my enzyme up: Synechocystis sp. PCC 6803 harboring recombinant IREDs can selectively reduce imines. With activities of up to 22 U gCDW−1 and corresponding product formations of up to 6.3 mM h−1, the system is comparable to other approaches avoiding the addition of organic cosubstrates for NADPH regeneration.

[Communications]
Hanna C. Büchsenschütz, Viktorija Vidimce-Risteski, Bettina Eggbauer, Dr. Sandy Schmidt, Dr. Christoph K. Winkler, Dr. Joerg H. Schrittwieser, Prof. Wolfgang Kroutil, Prof. Robert Kourist
doi.org/10.1002/cctc.201901592

Natural Deep Eutectic Solvents as Performance Additives for Peroxygenase Catalysis

17 December, 2019 - 00:00

Natural Deep Eutectic Solvents: Envisioned bienzymatic cascade for the selective oxyfunctionalisation of ethyl benzene or cis-ß-methylstyrene comprising the evolved peroxygenase from Agrocybe aegerita (rAaeUPO) and choline oxidase from Arthrobacter nicotianae (AnChOx) to provide rAaeUPO with H2O2.

[Communications]
Dr. Yunjian Ma, Yongru Li, Dr. Shahid Ali, Peilin Li, Dr. Wuyuan Zhang, Marine C. R. Rauch, Sébastien J.-P. Willot, Doris Ribitsch, Prof. Young Hae Choi, Prof. Miguel Alcalde, Prof. Frank Hollmann, Prof. Yonghua Wang
doi.org/10.1002/cctc.201901842

German Catalysis Society Meeting: Exploring the Various Facets of Catalysis

17 December, 2019 - 00:00

Tradition is tradition: Already for the 52nd time the Annual Meeting of the German Catalysis Society (GeCatS) took place from March 13th to 15th, 2019. Following its long-standing tradition, the meeting was organized in the Neue Weimarhalle in the beautiful city of Weimar, Thuringia.

[Conference Reports]
Dr. Juliane Titus, Florian Harth, Dr. Rene Eckert, Dr. Bastian T. Mei, Dr. Tanja Franken
doi.org/10.1002/cctc.201902185

Reduced Graphene Oxide Supported NiCo<sub>2</sub>O<sub>4</sub> Nano-Rods: An Efficient, Stable and Cost-Effective Electrocatalyst for Methanol Oxidation Reaction

17 December, 2019 - 00:00

NiCo2O4/rGO composite shows the enhanced electrocatalytic performance for the methanol oxidation reaction compare to the NiCo2O4 and commercial Pt/C

[Full Papers]
Naresh Narayanan, Prof. Dr. Neppolian Bernaurdshaw
doi.org/10.1002/cctc.201901496

Effect of Ordered Mesoporous Alumina Support on the Structural and Catalytic Properties of Mn−Ni/OMA Catalyst for NH<sub>3</sub>−SCR Performance at Low-temperature

17 December, 2019 - 00:00

NH3−SCR: Compared with Mn−Ni/Al2O3, the super SCR performances of Mn−Ni/OMA could be ascribed to not only the higher dispersion of MnOx but also more abundant Lewis acid sites, and the increase in redox capacity since the extremely primary MnO2 phase on catalyst's surface.

[Full Papers]
Dr. Yongjin Liu, Dr. Yaqin Hou, Prof. Xiaojin Han, Prof. Jiancheng Wang, Dr. Yaoping Guo, Dr. Ning Xiang, Dr. Yarong Bai, Prof. Zhanggen Huang
doi.org/10.1002/cctc.201901466

Nitrogen-Doped Hard Carbon on Nickel Foam as Free-Standing Anodes for High-Performance Sodium-Ion Batteries

17 December, 2019 - 00:00

For all your storage needs: Nitrogen-doped hard carbon on Ni foam is successfully synthesized as a free-standing anode for sodium-ion batteries. This materials with numerous active sites, expanded interlayer distance, and highly ordered pseudo-graphic structure can enhance the adsorption capacity and insertion capacity synergistically, exhibiting a high rate capability of 128.5 mAh g−1 at 10 A g−1, and excellent cycling stability of 225.4 mAh g−1 after 1000 cycles under high current density of 5 A g−1.

[Articles]
Dr. Ruizi Li, Prof. Jianfeng Huang, Prof. Jiayin Li, Prof. Liyun Cao, Yijia Luo, Yuanyuan He, Prof. Guoxing Lu, Prof. Aimin Yu, Shaoyi Chen
doi.org/10.1002/celc.201901770

Electrochemical Collisions of Individual Graphene Oxide Sheets: An Analytical and Fundamental Study

17 December, 2019 - 00:00

Collision course: The electrochemical signature from individual graphene oxide sheets colliding on an ultra-microelectrode is analyzed quantitatively as a function of particle size, charge, and salt concentration.

[Communications]
Dr. Christophe Renault, Prof. Serge G. Lemay
doi.org/10.1002/celc.201901606

Surface Engineering for Advanced Aqueous Supercapacitors: A Review

17 December, 2019 - 00:00

Breaching the surface: This Minireview highlights recent significant breakthroughs for supercapacitor (SC) research by using surface engineering approaches such as surface functionalization, heterostructure design, and surface charge modulation. Current challenges, emerging trends, and opportunities for advanced SCs are discussed accordingly.

[Minireviews]
Cuixia Xu, Hui Yang, Prof. Yi Li, Dr. Jianwei Wang, Prof. Xihong Lu
doi.org/10.1002/celc.201901926

Manipulating Charge-Transfer States in BODIPYs: A Model Strategy to Rapidly Develop Photodynamic Theragnostic Agents

17 December, 2019 - 00:00

Chemically tuning charge-transfer states (CTSs) in BODIPYs (boron dipyrromethenes) is revealed as workable strategy to modulate the population of triplet excited states in monochromophoric dyes focused to photodynamic theragnosis (PDT aided by fluorescence bioimaging). The strategy can be easily extended to different systems and triplet applications beyond PDT (in scheme: CT=charge transfer, ISC=intersystem crossing).

[Communications]
Josué Jiménez, Ruth Prieto-Montero, Prof. Beatriz L. Maroto, Prof. Florencio Moreno, Prof. María J. Ortiz, Ainhoa Oliden-Sánchez, Prof. Iñigo López-Arbeloa, Prof. Virginia Martínez-Martínez, Prof. Santiago de la Moya
doi.org/10.1002/chem.201904257

Au<sup>I</sup>-Catalyzed Haloalkynylation of Alkenes

17 December, 2019 - 00:00

Formally inserted: Cyclic and terminal alkenes react with bromo- and chloroalkynes under cationic gold catalysis to afford haloalkynylation products. Appropriate choice of ligands and conditions enabled the obtention of valuable haloalkynes with high levels of diastereo- regio- and enantioselectivity (see scheme).

[Communications]
Pedro D. García-Fernández, Cristina Izquierdo, Dr. Javier Iglesias-Sigüenza, Dr. Elena Díez, Prof. Rosario Fernández, Prof. José M. Lassaletta
doi.org/10.1002/chem.201905078

Synthesis and Biological Activity of Short Interfering RNAs Having Several Consecutive Amide Internucleoside Linkages

17 December, 2019 - 00:00

Code of silence: An siRNA having four consecutive phosphates of its guide strand replaced by amide linkages showed high silencing activity when the passenger strand had an amide linkage between its first and second nucleosides. Further increase in amide modification decreased the RNAi activity; however, siRNAs having up to nine amide linkages retained some silencing activity at higher concentrations.

[Full Papers]
Dr. Venubabu Kotikam, Julien A. Viel, Prof. Dr. Eriks Rozners
doi.org/10.1002/chem.201903754

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