Abstract The formation of a passivation film (solid electrolyte interphase, SEI) at the surface negative electrode full LiCoO 2 /graphite lithium‐ion cells using LiPF 6 (1 M ) in carbonate solvents as was investigated by means x‐ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). analyses were carried out different potentials first fifth cycles, showing potential‐dependent character surface‐film species formation. These mainly identified Li CO 3 up to 3.8 V LiF 4.2 V....

X-ray photoelectron valence spectra of lithium salts LiBF4, LiPF6, LiTFSI, and LiBETI have been recorded analyzed by means density functional theory (DFT) calculations, with good agreement between experimental calculated spectra. The results this study are used to characterize electrode/electrolyte interfaces graphite negative electrodes in Li-ion batteries using organic carbonate electrolytes containing LiTFSI or salts. By a combined spectroscopy (XPS) core peaks/valence analysis, we...

Chiral phosphoric acid-catalyzed asymmetric nitroso-Diels-Alder reaction of nitrosoarenes with carbamate-dienes afforded cis-3,6-disubstituted dihydro-1,2-oxazines in high yields excellent regio-, diastereo-, and enantioselectivities. Interestingly, we observed that the catalyst is able not only to control enantioselectivity but also reverse regioselectivity noncatalyzed reaction. The regiochemistry reversal asynchronous concerted mechanism were confirmed by DFT calculations.

Abstract Micro‐supercapacitors (MSC) are considered as promising miniaturized electrochemical energy storage devices for Internet of Things applications. Unfortunately, the technological readiness level these is still at lab scale with development individual prototypes due to difficulty produce high performance porous electrode material microelectronic equipment available in pilot production lines. Here, collective fabrication on chip MSC based sputtered vanadium nitride (VN) bifunctional...

Asymmetric [3 + 2] cycloaddition of quinones with ene- and thioene-carbamates was achieved by chiral phosphoric acid catalysis, providing the corresponding 3-amino-2,3-dihydrobenzofurans in excellent yields moderate to good diastereoselectivities enantioselectivities. An asymmetric tandem oxidative protocol starting from hydroquinones also accomplished phenyliodine(III) diacetate a same reaction vessel.

A highly enantio- and diastereoselective synthesis of 3-aminocyclopenta[b]indoles has been developed through formal [3+2] cycloaddition reaction enecarbamates 3-indolylmethanols. This transformation is catalyzed by a chiral phosphoric acid that achieves simultaneous activation both partners the cycloaddition. Mechanistic data are also presented suggest occurs stepwise pathway.

A highly efficient catalytic enantioselective intramolecular Povarov reaction was developed with primary anilines as 2-azadiene precursors. wide variety of angularly fused azacycles were obtained without column chromatography in high to excellent yields and diastereo- enantioselectivity (d.r.>99:1 up e.r. 99:1). Furthermore, the catalyst loading could be lowered 1 mol %, used key intermediates for further transformations generate additional molecular diversity.

Abstract The phosphine‐catalyzed Michael addition/intramolecular Wittig reaction between dialkyl acetylenedicarboxylate and amino‐carbaldehyde or amino ester derivatives has been developped. This can be rendered catalytic in phosphine by the situ chemoselective reduction of oxide with silane. methodology enables rapid access to a variety nitrogen‐containing heterocycles, which are present numerous natural products and/or bioactive compounds. Either classical heating microwave conditions give...

The first photoswitchable bimetallic gold catalysts based on an azobenzene backbone have been synthesized and their catalytic properties investigated.

With the aim of discovering new cytotoxic prenylated stilbenes schweinfurthin series, Macaranga tanarius was selected for detailed phytochemical investigation among 21 species examined by using a molecular networking approach. From an ethanol extract fruits, seven stilbenes, schweinfurthins K-Q (7-13), were isolated, along with vedelianin (1), schwenfurthins E-G (2-4), mappain (5), and methyl-mappain (6). The structures compounds established spectroscopic data analysis. relative...

Abstract N ‐Propargyl‐ and ‐homoallenyl‐2‐bromo‐β‐tryptamines undergo gold(I)‐catalyzed dearomatizing cyclizations to afford 2‐bromospiroindolenines that are in situ hydrolyzed furnish spirooxindoles a one‐pot process. Tryptophane derivatives (R 2 =CO Et) led upon cyclization chiral excellent diastereoselectivities. magnified image

The synthesis of halogenated cyclic guanidines through iodine(III)-mediated umpolung halide salts is described. Cyclic various sizes can be obtained with generally excellent regioselectivities either a chloro- or bromocyclization, using Koser's reagent and the corresponding lithium salt.

Abstract The total synthesis of the smallest cytochalasin isolated so far, periconiasin G, which bears a seven‐membered ring in lieu usual macrocycle, has been performed from both enantiomers citronellal, relying on an intramolecular Diels–Alder reaction favor natural endo stereochemistry. We show that, among four synthesized stereoisomers, including exo isomers, one matching NMR data product was not that assigned original report, imposing structure revision. product, previously...

We developed a simple and convenient method to assemble biaryls exploiting photoredox catalyst visible light.

Replacing aromatic donor ligands with cationic Pd₃⁺complexes.

A simple synthetic method allows the one-pot assembly of C3 -symmetric, 44-core-valence-electron, triangular Pd or Pt clusters and their heterobimetallic mixed Pd/Pt analogues. These metal complexes are first examples stable all-metal heteroaromatics. In contrast to traditional heteroaromatic molecules formed combining main-group elements, they actually retain structural electronic features homonuclear

The next generation of Internet Things devices requires micro-supercapacitors operating at high voltage which is difficult to achieve using symmetrical design. Thus, their fabrication in an asymmetric configuration mandatory. While MnO 2 well-established as positive electrode, the scarcity existing efficient materials able be used negative side drives research towards new promising materials. Since few years, a class oxide materials, named multicationic oxides, were demonstrated attractive...

A large-scale in vitro screening of tropical plants using an antibacterial assay permitted the selection several species with significant activities. Bioassay-guided purification dichloromethane extract leaves Malaysian Vitex vestita, led to isolation six new labdane-type diterpenoids, namely, 12-epivitexolide (2), vitexolides B and C (3 4), vitexolide E (8), vitexolins (5 6), along known compounds, (1) D (7), acuminolide (9), 3β-hydroxyanticopalic acid (10), 8α-hydroxyanticopalic (11),...

This study demonstrates the ability of ammonium uranyl peroxide nanoclusters U32R-NH₄ to undergo exchange in between NH₄⁺ and trivalent (Nd³⁺) or tetravalent (Th⁴⁺) cations solid state.

Activated cobalt metal salts are effective and versatile catalysts for the chemoselective reduction of esters to aldehydes or alcohols through hydrosilylation reaction.