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Ultrafast Molecular Rotors and Their CO<sub>2</sub> Tuning in MOFs with Rod-Like Ligands

Articles from Wiley - 2 agosto, 2017 - 00:00

Ultrafast Molecular Rotors and Their CO2 Tuning in MOFs with Rod‐Like Ligands

MOF, I′m only dancing: CO2 gas flows into the Zn-based MOF which sustains ultrafast rotors and intervenes actively in the motional mechanics, increasing reversibly the energy barrier for rotation and allowing active manipulation of molecular rotor dynamics (see figure).

[Communication]
Silvia Bracco, Fabio Castiglioni, Angiolina Comotti, Simona Galli, Mattia Negroni, Angelo Maspero, Piero Sozzani
Chem. Eur. J., August 02, 2017, https://doi.org/10.1002/chem.201702930 Read article

Total Syntheses of Pyroclavine, Festuclavine, Lysergol, and Isolysergol via a Catalytic Asymmetric Nitro-Michael Reaction

Articles from Wiley - 2 agosto, 2017 - 00:00

Total Syntheses of Pyroclavine, Festuclavine, Lysergol, and Isolysergol via a Catalytic Asymmetric Nitro‐Michael Reaction

Vicinal stereocenter: Unified total syntheses of a number of ergot alkaloids has been envisioned via a key thiourea-catalyzed intramolecular nitronate addition onto &#x3B1;,&#x3B2;-unsaturated ester to achieve exceptional levels of enantioselectivity (up to 97 % ee) with moderate diastereoselectivity (up to 4:1; see scheme). This methodology ensures first total syntheses of pyroclavine (1 e), and festuclavine (1 c), in addition to other congeners such as, lysergol (1 b), and isolysergol (1 d).

[Communication]
Subhajit Bhunia, Saikat Chaudhuri, Alakesh Bisai
Chem. Eur. J., August 02, 2017, https://doi.org/10.1002/chem.201702459 Read article

A Target-Directed Chemo-Photothermal System Based on Transferrin and Copolymer-Modified MoS<sub>2</sub> Nanoplates with pH-Activated Drug Release

Articles from Wiley - 2 agosto, 2017 - 00:00

A Target‐Directed Chemo‐Photothermal System Based on Transferrin and Copolymer‐Modified MoS2 Nanoplates with pH‐Activated Drug Release

A target-directed chemo-photothermal therapy system with pH-activated drug release behavior is prepared based on MoS2 nanoplates modified with transferrin and copolymer P(OEG-A)-b-P(VBA-co-KH570). The as-prepared DOX-POVK-MoS2-Tf nanocomposites exhibit well a therapeutic effect to HepG2 cells owing to the combined effects of target-directed uptake, acid-triggered drug release and NIR-induced localized heating, which suggest the designed MoS2 nanocarriers are promising for active-targeting chemo-photothermal synergetic therapy.

[Full Paper]
Aitang Zhang, Aihua Li, Wenxue Tian, Zichao Li, Chen Wei, Yong Sun, Wei Zhao, Mengli Liu, Jingquan Liu
Chem. Eur. J., August 02, 2017, https://doi.org/10.1002/chem.201701916 Read article

Amorphous Cobalt Oxide Nanoparticles as Active Water-Oxidation Catalysts

Articles from Wiley - 2 agosto, 2017 - 00:00

Amorphous Cobalt Oxide Nanoparticles as Active Water‐Oxidation Catalysts

WOC of life: Amorphous cobalt oxide nanoparticles (2 nm) composed of one-dimensional chains of dimeric edge-sharing octahedra are extremely active towards water oxidation with a turnover frequency (TOF) value reaching 8.6 s−1 in the photocatalytic Ru(bpy)32+–Na2S2O8 (bpy=2,2′-bipyridyl) system.

[Communication]
Zheng Chen, Zhiyao Duan, Zhiliang Wang, Xiaoyan Liu, Lin Gu, Fuxiang Zhang, Michel Dupuis, Can Li
ChemCatChem, August 02, 2017, https://doi.org/10.1002/cctc.201700882 Read article

Palladium-Catalyzed Ethylene/Methyl Acrylate Co-Oligomerization: The Effect of a New Nonsymmetrical α-Diimine with the 1,4-Diazabutadiene Skeleton

Articles from Wiley - 2 agosto, 2017 - 00:00

Palladium‐Catalyzed Ethylene/Methyl Acrylate Co‐Oligomerization: The Effect of a New Nonsymmetrical &#x3B1;‐Diimine with the 1,4‐Diazabutadiene Skeleton

Leg up for oligomers: PdII complexes with a new nonsymmetrical bis(aryl-imino)diazabutadiene ligand are studied as precatalysts in the ethylene/methyl acrylate co-oligomerization. A comparison with the corresponding aryl &#x3B1;-diimines with an acenaphthene skeleton shows that the bis(aryl-imino)diazabutadiene derivatives are more productive.

[Full Paper]
Vera Rosar, Tiziano Montini, Gabriele Balducci, Ennio Zangrando, Paolo Fornasiero, Barbara Milani
ChemCatChem, August 02, 2017, https://doi.org/10.1002/cctc.201700504 Read article

The Role of Gas in Determining Image Quality and Resolution During In Situ Scanning Transmission Electron Microscopy Experiments

Articles from Wiley - 2 agosto, 2017 - 00:00

The Role of Gas in Determining Image Quality and Resolution During In Situ Scanning Transmission Electron Microscopy Experiments

Quality images: In situ environmental (scanning) transmission electron microscopy (ESTEM) has opened up new opportunities for studying atomic-level dynamics in heterogeneous catalysis. This work provides the first evaluation of the sensitivity and resolution of STEM imaging mode with the presence of gases. ESTEM offers superior sensitivity and predictable resolution in imaging solid catalysts under realistic reaction conditions.

[Full Paper]
Yuanyuan Zhu, Nigel D. Browning
ChemCatChem, August 02, 2017, https://doi.org/10.1002/cctc.201700474 Read article

Preyssler Heteropolyacids in the Self-Etherification of 5-Hydroxymethylfurfural to 5,5′-[Oxybis(methylene)]bis-2-furfural Under Mild Reaction Conditions

Articles from Wiley - 2 agosto, 2017 - 00:00

Preyssler Heteropolyacids in the Self‐Etherification of 5‐Hydroxymethylfurfural to 5,5′‐[Oxybis(methylene)]bis‐2‐furfural Under Mild Reaction Conditions

Press on with Preyssler: The self-etherification of 5-hydroxymethylfurfural (5-HMF) is studied using Preyssler heteropolyacids (HPAs). The formation of 5,5′-[oxybis(methylene)]bis-2-furfural (OBMF) is related to the amount of Brønsted acid sites. The Lewis acidity of HPA/Al2O3 favors the formation of 2,5-dimethylfurane. A yield of 84 % of OBMF at 5 h and 343 K is obtained under the optimized conditions.

[Full Paper]
Alexander Páez, Hugo A. Rojas, Omar Portilla, Gabriel Sathicq, Carlos A. M. Afonso, Gustavo P. Romanelli, José J. Martínez
ChemCatChem, August 02, 2017, https://doi.org/10.1002/cctc.201700457 Read article

Synthesis of 4-Formyl-2-arylbenzofuran Derivatives by PdCl(C<sub>3</sub>H<sub>5</sub>)dppb-Catalyzed Tandem Sonogashira Coupling-Cyclization under Microwave Irradiation - Application to the Synthesis of Viniferifuran Analogues

Articles from Wiley - 1 agosto, 2017 - 00:00

Synthesis of 4‐Formyl‐2‐arylbenzofuran Derivatives by PdCl(C3H5)dppb‐Catalyzed Tandem Sonogashira Coupling‐Cyclization under Microwave Irradiation ‐ Application to the Synthesis of Viniferifuran Analogues

An improved method for the synthesis of 4-formyl-2-arylbenzofuran derivatives is described using tandem Sonogashira-cyclization on ortho-halophenol derivatives catalyzed by PdCl(C3H5)dppb. Further applications included the direct PdCl(C3H5)dppb catalyzed C-3 arylation of benzofurans and the synthesis of polyphenolic analogues of viniferifuran.

[Communication]
Duy D. Vo, Mikael Elofsson
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701490 Read article

Grow Bimetallic Platinum-Iridium Alloy on Reduced Graphene Oxide to Construct Hetero-Atomic Bridge Catalysis toward Efficient Electrooxidation of Methanol

Articles from Wiley - 1 agosto, 2017 - 00:00

Grow Bimetallic Platinum‐Iridium Alloy on Reduced Graphene Oxide to Construct Hetero‐Atomic Bridge Catalysis toward Efficient Electrooxidation of Methanol

Ir surface can easily produce Ir-OH species, which could directly oxidize the absorbed CO at its neighboring Pt atom, displaying a unique heteroatomic bridged catalysis. The as-prepared Pt4Ir1/rGO presents the most negative onset potential and the highest electrocatalytic activity toward methanol oxidation reaction, offering great potential of Pt4Ir1/rGO catalyst to replace Pt/C catalyst as superb anode catalyst for DMFCs.

[Full Paper]
Ling Zhou, Zhi Liang Zhao, Lian Ying Zhang, Hong Ming An, Chang Ming Li
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701379 Read article

In Situ Generation of Core-Shell Protein-Based Microcapsules with Regulated Ion Absorbance Capacity

Articles from Wiley - 1 agosto, 2017 - 00:00

In Situ Generation of Core‐Shell Protein‐Based Microcapsules with Regulated Ion Absorbance Capacity

We demonstrated a way to synthesize a new type of core-shell protein microcapsules composed of in-situ generated inner poly(o-phenylenediamine) (POPD) core and outer protein-based shell. Via controlling the permeability of the shell by the cleavage of the polymer or forming a TA/Fe3+ outer shell, the adsorption capacity of heavy metal ions of the inner POPD nanoparticles could be well modulated.

[Communication]
Pei Zhou, Lei Wang, Guangyu Wu, Yuting Zhou, Mohammad Hegazy, Xin Huang
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701339 Read article

Effects of Anthryl Groups on the Charge Transport and Photovoltaic Properties of Small Triarylamine-Based Donor-Acceptor Molecules: A Joint Experimental and Theoretical Study

Articles from Wiley - 1 agosto, 2017 - 00:00

 A Joint Experimental and Theoretical Study

Replacing an outer phenyl ring of triphenylamine in a small push-pull molecule by a 2-anthryl group produces a decrease of the hole-mobility of the resulting material while replacement by a 9-anthryl group has the opposite effect

[Full Paper]
Yue Jiang, Clément Cabanetos, Siriporn Jungsuttiwong, Domenico Alberga, Carlo Adamo, Jean Roncali
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701305 Read article

Co-crystals with Delayed Fluorescence Assembled by 1,4-Diiodotetrafluorobenzene and Polycyclic Aromatic Compounds via Halogen Bonds

Articles from Wiley - 1 agosto, 2017 - 00:00

Co‐crystals with Delayed Fluorescence Assembled by 1,4‐Diiodotetrafluorobenzene and Polycyclic Aromatic Compounds via Halogen Bonds

Four binary co-crystals with delayed fluorescence were prepared by solvent evaporation method. Crystal structure analysis reveals that the face-to-face pattern of 1,4-DITFB and donors, C−I•••&#x3C0; and C−I•••O interactions mainly formed the crystal structure, which also affects fluorescence emission

[Full Paper]
Hao Sun, Mingliang Wang, Arshad Khan, Yaqi Shan, Kun Zhao, Rabia Usman, Chunxiang Xu
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701288 Read article

Acclimation Strategy Using Complex Volatile Fatty Acid Mixtures Increases the Microbial Fuel Cell (MFC) Potential

Articles from Wiley - 1 agosto, 2017 - 00:00

Acclimation Strategy Using Complex Volatile Fatty Acid Mixtures Increases the Microbial Fuel Cell (MFC) Potential

Successful microbial acclimation: Bacteria from domestic wastewater were acclimated to acetic, propionic, and butyric acids in gradually more complex mixtures to produce electricity in microbial fuel cells. The acclimatization procedure allowed increasing the cell potential in a half of the potential reached with acetate as model substrate.

[Full Paper]
Alejandra Rosales-Sierra, Sergio Rosales-Mendoza, Elizabeth Monreal-Escalante, Lourdes B. Celis, Elías Razo-Flores, Bibiana Cercado
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701267 Read article

Phosphatase Mimicking Activity of Two Zinc(II) Schiff Base Complexes with Zn<sub>2</sub>O<sub>2</sub> Cores: NBO Analysis and MEP Calculation to Estimate Non-Covalent Interactions

Articles from Wiley - 1 agosto, 2017 - 00:00

 NBO Analysis and MEP Calculation to Estimate Non‐Covalent Interactions

Two new zinc(II) Schiff base complexes have been synthesized and characterized by X-ray crystallography. DFT calculations were employed to estimate contribution of various non-covalent interactions in the formation of self-assembly using several theoretical models. Excellent phosphatase mimicking activity was exhibited by both complexes.

[Full Paper]
Tanmoy Basak, Anik Bhattacharyya, Mithun Das, Klaus Harms, Antonio Bauzá, Antonio Frontera, Shouvik Chattopadhyay
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701246 Read article

Electrocatalytic Oxidations of Formic Acid and Ethanol over Pd Catalysts Supported on a Doped Polypyrrole-Carbon Composite

Articles from Wiley - 1 agosto, 2017 - 00:00

Electrocatalytic Oxidations of Formic Acid and Ethanol over Pd Catalysts Supported on a Doped Polypyrrole‐Carbon Composite

A polypyrrole-carbon composite (PPyCC) was prepared by doping polymerization method of polypyrrole over carbon with a dopant of camphor sulfonic acid (CSA), which was used as Pd catalyst support. The as-prepared Pd/PPyCC catalysts showed an excellent catalytic activity for electrooxidations of formic acid and ethanol with long-term durability. This newly developed support material should be of great importance and potential to the direct liquid fuel cell application.

[Full Paper]
Hyunsu Han, Yuseong Noh, Yoongon Kim, V. S. K. Yadav, Seongmin Park, Wongeun Yoon, Seungjun Lee, Won Bae Kim
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701112 Read article

Cr–Containing Magnetic Oxides in a Methanol Synthesis: Does Cr Ion Distribution Matter?

Articles from Wiley - 1 agosto, 2017 - 00:00

 Does Cr Ion Distribution Matter?

Enhanced catalysis: A close contact between Cr3+ and Fe3O4 species and the enrichment of the nanoparticle surface with Cr ions ensure exceptional catalytic properties of these catalysts in the reaction of syngas to methanol and their high stability during repeated use.

[Full Paper]
Nicholas Baird, Jasper W. Dittmar, Yaroslav B. Losovyj, Maren Pink, David Gene Morgan, Barry D. Stein, Alexandra S. Torozova, Irina Yu. Krasnova, Maxim E. Grigoriev, Alexander I. Sidorov, Mikhail G. Sulman, Zinaida B. Shifrina, Lyudmila M. Bronstein
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201700982 Read article

Enhancing Charge Separation and Photocatalytic Activity of Cubic SrTiO<sub>3</sub> with Perovskite-Type Materials MTaO<sub>3</sub> (M=Na, K) for Environmental Remediation: A First-Principles Study

Articles from Wiley - 1 agosto, 2017 - 00:00

 A First‐Principles Study

A bifunctional MTaO3/SrTiO3(010) (M=Na, K) heterostructure photocatalyst was designed for H2 production and photocatalytic degradation of pollutants using the hybrid HSE06 method. Based on the band alignment results, the MTaO3/SrTiO3(010) heterostructure are highly efficient for energy conversion and pollutants degradation.

[Full Paper]
Francis Opoku, Krishna Kuben Govender, Cornelia Gertina Catharina Elizabeth van Sittert, Penny Poomani Govender
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201700886 Read article

A Domino Approach for the Synthesis of <i>α</i>-Iodo-<i>β</i>-dicarbonyl Compounds from <i>α</i>-Epoxycarbonyls

Articles from Wiley - 1 agosto, 2017 - 00:00

A Domino Approach for the Synthesis of &#x3B1;‐Iodo‐&#x3B2;‐dicarbonyl Compounds from &#x3B1;‐Epoxycarbonyls

First approach for the synthesis of &#x3B1;-iodo-&#x3B2;-dicarbonyl compounds from &#x3B1;-epoxycarbonyls was developed. Various functional groups are well tolerated under the present reaction conditions. The potential synthetic applicability of this method was investigated on a gram scale using the model reaction. The advantages of the present method are operational simplicity, short reaction time, general applicability, good tolerance to scale-up synthesis, as well as readily available reagents.

[Communication]
Sachinta Mahato, Rana Chatterjee, Sougata Santra, Grigory V. Zyryanov, Alakananda Hajra, Adinath Majee
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201700867 Read article

Front Cover: Synthesis of 6-Azaspiro[4.3]alkanes: Innovative Scaffolds for Drug Discovery (Eur. J. Org. Chem. /2017)

Articles from Wiley - 1 agosto, 2017 - 00:00

 Innovative Scaffolds for Drug Discovery (Eur. J. Org. Chem. /2017)

The cover picture shows novel scaffolds for drug discovery, 6 azaspiro[4.3]alkanes, which have been synthesized by Enamine chemists (Ukraine, Kyiv). The synthesis starts from common four-membered-ring ketones, such as cyclobutanone, thienone, or N-Boc-azetidinone, and includes only two chemical steps. The key transformation is the reaction between electron-deficient exocyclic alkenes and in situ generated N-benzyl azomethine ylide. The high potential of the developed method was demonstrated by the novel synthesis of the central core of the known antibacterial agent DV-7751. Details are discussed in the Full Paper by P. K. Mykhailiuk et al. on page -- ff (https://doi.org/10.1002/ejoc.201700536).

[Front Cover]
Bohdan A. Chalyk, Andrei A. Isakov, Maryna V. Butko, Kateryna V. Hrebeniuk, Olena V. Savych, Olexandr V. Kucher, Konstantin S. Gavrilenko, Tetiana V. Druzhenko, Vladimir S. Yarmolchuk, Sergey Zozulya, Pavel K. Mykhailiuk
Eur. J. Org. Chem., August 01, 2017, https://doi.org/10.1002/ejoc.201701057 Read article

A Mechanochemical-Assisted Oxidation of Amines to Carbonyl Compounds and Nitriles

Articles from Wiley - 1 agosto, 2017 - 00:00

A Mechanochemical‐Assisted Oxidation of Amines to Carbonyl Compounds and Nitriles

[Full Paper]
Silvia Gaspa, Andrea Porcheddu, Antonio Valentoni, Sebastiano Garroni, Stefano Enzo, Lidia De Luca
Eur. J. Org. Chem., August 01, 2017, https://doi.org/10.1002/ejoc.201700689 Read article

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