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Sustainable Knowledge-Driven Approaches in Transition-Metal-Catalyzed Transformations

Articles from Wiley - 12 giugno, 2019 - 00:00

A cunning plan: The rational design of innovative and efficient chemical transformations based on fundamental knowledge constitutes one of the most promising sustainable strategies for the synthesis of organic scaffolds. Herein, the potential of theoretical and experimental knowledge-driven approaches for the sustainable development of transition-metal-catalyzed transformations is shown.

[Minireviews]
Jesús Sanjosé-Orduna, Ángel L. Mudarra, Dr. Sara Martínez de Salinas, Dr. Mónica H. Pérez-Temprano
doi.org/10.1002/cssc.201900914

A Dicationic Bismuth(III) Lewis Acid: Catalytic Hydrosilylation of Olefins

Articles from Wiley - 12 giugno, 2019 - 00:00

“Soft” Bismuth Working “Hard”! The first example of a highly electrophilic bismuth dication catalyzing olefin hydrosilylation under mild conditions is presented.

[Communications]
Selvakumar Balasubramaniam, Sandeep Kumar, Alex P. Andrews, Babu Varghese, Eluvathingal D. Jemmis, Ajay Venugopal
doi.org/10.1002/ejic.201900459

A New Family of 2D Coordination Polymers Based on 3d-4f 15-Metallacrown-5 Units: Synthesis, Structure, and Single-Molecule Magnet Behavior

Articles from Wiley - 12 giugno, 2019 - 00:00

A new family of 2D coordination polymers based on 3d-4f 15-metallacrown-5 (MC) units was designed and characterized. The connection of the 15-metallacrown-5 subunits by the coordination of CuII and ligand led to the formation of 2D network of metallacrowns. The GdIII, TbIII, and DyIII complexes exhibit slow magnetic relaxation, and the DyIII complex is a single-molecule magnet under 1000 Oe dc field.

[Communications]
Hong-Gang Zhang, Hua Yang, Lei Sun, Da-Cheng Li, Jian-Min Dou
doi.org/10.1002/ejic.201900188

High-Temperature Reversible Phase Transition and Switchable Dielectric and Semiconductor Properties in a 2D Hybrid [(C<sub>3</sub>H<sub>12</sub>N<sub>2</sub>O)CdCl<sub>4</sub>]<i><sub>n</sub></i>

Articles from Wiley - 12 giugno, 2019 - 00:00

A new 2D hybrid [(C3H12N2O)CdCl4]n exhibits a reversible phase transition at a high temperature of 393 K with a switchable dielectric state between low and high temperature, which has a direct band gap with a value close to 4.40 eV.

[Communications]
Chang-Feng Wang, Xiao-Wei Fan, Yu-Hui Tan, Wen-Juan Wei, Yun-Zhi Tang
doi.org/10.1002/ejic.201900493

The XB(C<sub>6</sub>F<sub>5</sub>)<sub>2</sub> Halogenoborane Route to Phosphole Derivatives

Articles from Wiley - 12 giugno, 2019 - 00:00

Dimesityl(propynyl)phosphane reacts with the halogenoboranes X-B(C6F5)2 (X: Cl, Br) by means of an addition/rearrangement sequence to give X-P/B Lewis pairs. These react with two alkynyllithium equivalents to form the alkynyl borato phospholes.

[Full Papers]
Jennifer Möricke, Atsushi Ueno, Birgit Wibbeling, Constantin G. Daniliuc, Gerald Kehr, Gerhard Erker
doi.org/10.1002/ejic.201900505

Pyridylbenzimidazole-Based Gold(III) Complexes: Lysozyme Metalation, DNA Binding Studies, and Biological Activity

Articles from Wiley - 12 giugno, 2019 - 00:00

The sulfonate group has a role in the interaction of the Au(III) complex with lysozyme by inhibiting ligand cleavage via the participation in Coulombic and H-bond interactions. The Au(III) complex incorporating a sulfonate group exhibited antifungal activity against C. neoformansvar. grubii, perfect compatibility with the blood components, and non-cytotoxicity to non-malignant cell HEK293.

[Full Papers]
Ahmed M. Mansour, Ola R. Shehab
doi.org/10.1002/ejic.201900155

Toward Metal-Organic-Framework-Based Supercapacitors: Room-Temperature Synthesis of Electrically Conducting MOF-Based Nanocomposites Decorated with Redox-Active Manganese

Articles from Wiley - 12 giugno, 2019 - 00:00

Electrically conducting zirconium-based MOF (Zr-MOF)-carbon nanotube (CNT) nanocomposites were synthesized at room temperature. Redox-active manganese sites were then installed in the Zr-MOF and nanocomposites to enable redox hopping in the MOF phase. The Mn-decorated Zr-MOF-CNT nanocomposites show much higher pseudocapacitive performance than both the Mn-decorated Zr-MOF and the Mn-decorated CNT.

[Full Papers]
Yi-Sen Wang, Yu-Chuan Chen, Jun-Hong Li, Chung-Wei Kung
doi.org/10.1002/ejic.201900584

[Cp<sub>2</sub>Mo(OH)(OH<sub>2</sub>)]<sup>+</sup>-Catalyzed Hydrolysis of Mono- and Difunctional Ethers: Theoretical Understanding of Their Divergent Reactivity

Articles from Wiley - 12 giugno, 2019 - 00:00

Computations show that the coordination to Mo of ethyl vinyl or divinyl ethers by a terminal vinyl carbon is by far more favorable than routes involving the complexation to ether oxygen or end ethyl carbon. The Mo-vinyl coordination significantly activates the vinyl carbon directly linked to ether oxygen, thus making easier the nucleophilic attack of the hydroxo ligand.

[Full Papers]
Daniel Álvarez, Elena Castro-López, Yoana Fernández-Pulido, M. Isabel Menéndez, Ramón López
doi.org/10.1002/ejic.201900513

Ruthenium-Catalyzed C-H Bond Activation/Arylation Accelerated by Biomass-Derived Ligands

Articles from Wiley - 12 giugno, 2019 - 00:00

Readily available biomass-derived ligands significantly improved the catalytic activity of [(η6-p-cymene)RuCl2]2 for ortho C-H bond activation/arylation of 2-phenylpyridine with a variety of (hetero)aryl chlorides under water-based reaction conditions. The ligand levulinic acid achieved 7-fold enhancement, as the ligand-assisted route is energetically more favorable.

[Full Papers]
Chinky Binnani, Shyama Charan Mandal, Biswarup Pathak, Sanjay K. Singh
doi.org/10.1002/ejic.201900218

Surface Chemistry Directs the Tunable Assembly of TiO<sub>2</sub> Anatase Nanocubes into Three-Dimensional Mesocrystals

Articles from Wiley - 12 giugno, 2019 - 00:00

Nanoscale surface chemistry was used to direct the self-assembly of TiO2 anatase nanocubes into a three-dimensional superlattice. High nanocrystal solubility induced by 3,4-dihydroxyhydrocinnamic acid and weak electrostatic attraction due to surface charge and NH4+ counterions led to the formation of colloidal crystals with a high degree of translational and orientational order.

[Full Papers]
Hannah Huesmann, Eugen Schechtel, Ingo Lieberwirth, Martin Panthöfer, Wolfgang Tremel
doi.org/10.1002/ejic.201900376

Self-Organized Arrays of SnO<sub>2</sub> Microplates with Photocatalytic and Antimicrobial Properties

Articles from Wiley - 12 giugno, 2019 - 00:00

Anodization of tin foils in buffered oxalic acid at low voltages leads to the formation of oriented layers of sub-microsized SnO2 plates, whose orientation is related to the domains of the underlying polycrystalline, but oriented β-Sn foil. Under UV illumination the structured SnO2 surface shows self-cleaning behavior.

[Full Papers]
Nils Mohri, Hannes Kerschbaumer, Thorben Link, Rute Andre, Martin Panthöfer, Vadim Ksenofontov, Wolfgang Tremel
doi.org/10.1002/ejic.201900348

Salt of Ring-Reduced Iron(II) Octaethyltetrapyrazinoporphyrazine Containing Trimetallic Dianions with Peripherally Coordinated ZnCl<sub>2</sub> Units: {Fe<sup>II</sup>(TPyzPzEt<sub>8</sub>)<sup>4-</sup>(ZnCl<sub>2</sub>)<sub>2</sub>}<sup>2-</sup>

Articles from Wiley - 12 giugno, 2019 - 00:00

Salt (PPN+)2{FeII(TPyzPzEt8)4- (ZnCl2)2}2- was obtained by reducing iron(II) octaethyltetrapyrazinoporphyrazine with zinc dust. The coordination of ZnCl2 units to meso- and pyrazine nitrogen atoms of the TPyzPzEt8 macrocycle is observed for the first time allowing to increase acceptor properties of the macrocycle.

[Full Papers]
Maxim A. Faraonov, Nikita R. Romanenko, Alexey V. Kuzmin, Dmitri V. Konarev, Alexander F. Shestakov, Pavel A. Stuzhin, Salavat S. Khasanov, Akihiro Otsuka, Hideki Yamochi, Hiroshi Kitagawa, Rimma N. Lyubovskaya
doi.org/10.1002/ejic.201900511

The Influence of Active Biomolecules in Plant Extracts on the Performance of Au/TS-1 Catalysts in Propylene Epoxidation

Articles from Wiley - 12 giugno, 2019 - 00:00

The influence of biomolecules on the activity and stability of biosynthesized Au/TS-1 catalysts for propylene epoxidation is reported for the first time.

[Full Papers]
Ting Lian, Wei Zeng, Hai Liu, Jing Yu, Jiale Huang, Haitao Wang, Daohua Sun
doi.org/10.1002/ejic.201900397

Complexes Containing a Phenol-Platinum(II) Hydrogen Bond: Synthons for Supramolecular Self-Assembly and Precursors for Hydridoplatinum(IV) Complexes

Articles from Wiley - 12 giugno, 2019 - 00:00

Electron-rich organoplatinum complexes can form intramolecular or intermolecular OH··Pt hydrogen bonds, but formation of hydroplatinum(IV) complexes requires a strong acid such as HCl.

[Full Papers]
Ava Behnia, Mahmood Azizpoor Fard, Paul D. Boyle, Richard J. Puddephatt
doi.org/10.1002/ejic.201900480

Enhanced Separation Concept (ESC): Removing the Functional Subunit from the Electrode by Molecular Design

Articles from Wiley - 12 giugno, 2019 - 00:00

The reliability of single molecule switches is improved by better separating the molecule's functional subunit from the electrode surface. Both, increasing the spacing and insulation by bulky substituents contributed to increase the likeliness of spin cross-over events in immobilized iron(II) terpyridine complexes.

[Full Papers]
Thomas Brandl, Maria El Abbassi, Davide Stefani, Riccardo Frisenda, Gero D. Harzmann, Herre S. J. van der Zant, Marcel Mayor
doi.org/10.1002/ejoc.201900432

Strategies for the Asymmetric Construction of Pelletierine and its Use in the Synthesis of Sedridine, Myrtine, and Lasubine

Articles from Wiley - 12 giugno, 2019 - 00:00

Three methods are described for the synthesis of both enantiomers of optically active pelletierine. The usefulness of these compounds as building blocks is demonstrated in the asymmetric syntheses of several piperidine-based compounds of interest.

[Full Papers]
Raed K. Zaidan, Paul Evans
doi.org/10.1002/ejoc.201900477

Microwave-Assisted Domino Heck Cyclization and Phosphorylation: Synthesis of Phosphorus Containing Heterocycles

Articles from Wiley - 12 giugno, 2019 - 00:00

A domino [Pd]-catalyzed intramolecular Heck cyclization followed by intermolecular phosphorylation, for the construction of phosphorus containing heterocyclic compounds, is presented. Notably, the process is accelerated by microwave heating conditions and enabled the construction of C-C and C-P bonds in short reaction times.

[Full Papers]
Karu Ramesh, Gedu Satyanarayana
doi.org/10.1002/ejoc.201900510

Catalytic Friedel-Crafts Reactions on Saturated Heterocycles and Small Rings for sp<sup>3</sup>-sp<sup>2</sup> Coupling of Medicinally Relevant Fragments

Articles from Wiley - 12 giugno, 2019 - 00:00

A systematic comparison of Lewis acid catalysts [Ca(II), Li(I) and Fe(III)] is presented for catalytic Friedel-Crafts reactions using alcohols on 4-, 5-, and 6-membered oxygen and nitrogen heterocycles and cyclobutanes, forming gem-diaryl quaternary centers.

[Full Papers]
Rosemary A. Croft, Maryne A. J. Dubois, Alexander J. Boddy, Camille Denis, Anna Lazaridou, Anne Sophie Voisin-Chiret, Ronan Bureau, Chulho Choi, James J. Mousseau, James A. Bull
doi.org/10.1002/ejoc.201900498

Chemjobber's mailbag: Business cards, interviewing etiquette, and more

Chemical News - 11 giugno, 2019 - 22:36
Chemistry blogger answers readers' questions in this edition of Bench & Cubicle

CVS launches dietary supplement testing program

Chemical News - 11 giugno, 2019 - 20:03
The retailer's program requires third-party testing of supplements before they can be sold at CVS stores

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