Polymer shape-memory aerogels (PSMAs) are prospects in various fields of application ranging from aerospace to biomedicine, as advanced thermal insulators, actuators, or sensors. However, the fabrication PSMAs with good mechanical performance is challenging and currently dominated by fossil-based polymers. In this work, strong, bio-aerogels high specific surface areas (up 220 m2/g) low radial conductivity (0.042 W/mK) were prepared through a one-step treatment native wood using an ionic...

Elevated by the support: 2-Alkynyl aniline cycloisomerization to indole is catalyzed cationic Au NPs on a carbon support. Electroneutral and rich 2-aryl indoles are further converted into 3,3′-biindoles oxidative homocoupling that readily carbon, exclusively but also somewhat sluggishly As service our authors readers, this journal provides supporting information supplied authors. Such materials peer reviewed may be re-organized for online delivery, not copy-edited or typeset. Technical...

Eco-friendly materials with superior thermal insulation and mechanical properties are desirable for improved energy- space-efficiency in buildings. Cellulose aerogels structural anisotropy could fulfill these requirements, but complex processing high energy demand challenges scaling up. Here we propose a scalable, nonadditive, top-down fabrication of strong anisotropic directly from wood excellent, near isotropic functions. The aerogel was obtained through cell wall dissolution controlled...

Abstract The limited access to fast and facile general analytical methods for cellulosic and/or biocomposite materials currently stands as one of the main barriers progress these disciplines. To that end, a diverse set narrow techniques are typically employed often time-consuming, costly, not necessarily available on daily basis practitioners. Herein, we rigorously demonstrate quantitative NMR spectroscopic method structural determination crystalline cellulose samples. Our relies use readily...

The syntheses, crystal structures, and the experimental theoretical magnetochemical characterization for three tetrametallic Ni(II) clusters, namely, [Ni4(L)4(Cl)2(MeOH)2](ClO4)2·4MeOH (1), [Ni4(L)4(N3)2(MeOH)2](ClO4)2·2MeOH (2), [Ni4(L1)4(pyz)2(PhCOO)2(MeOH)2](ClO4)2·7MeOH (3) (where HL HL1 represent bipyridine-2-carboxamideoxime pyrimidine-2-carboxamideoxime, respectively) are reported. Within Ni42+ units of these compounds, distorted octahedral ions bridged by carboxamideoximato ligands...

The multicomponent assembly of pharmaceutically relevant N-aryl-oxazolidinones through the direct insertion carbon dioxide into readily available anilines and dibromoalkanes is described. addition catalytic amounts an organosuperbase such as Barton's base enables this transformation to proceed with high yields exquisite substrate functional-group tolerance under ambient CO2 pressure mild temperature. This report also provides first proof-of-principle for single-operation synthesis elusive...

Nucleophilic ionic sources of fluoride are essential reagents in the synthetic toolbox to access high added-value fluorinated building blocks unattainable by other means. In this review, we provide a concise description and rationale outstanding features one these reagents, tetramethylammonium (TMAF), as well disclosing different methods for its preparation, how physicochemical properties solvation effects solvents intimately associated with reactivity. Furthermore, herein also...

A six-step approach to the tetracyclic core of merrilactone is described that uses an intramolecular Paternò−Büchi photoaddition install key oxetane ring. Irradiation bicyclic enone 16, constructed through cyclopentenone alkylation followed by a domino oxy-/carbopalladation reaction, produces 17 in excellent yield, having carbon skeleton target compound A.

A novel strategy is developed to produce catalytically active cationic Au(III) species by pyridine-tethered NHC complexes. The catalytic properties of two complexes, equipped with distinct pyridine moieties, were studied for benchmark reactions, the cycloisomerization alkynylfurans isobenzofuranoles and o-alkynylanilines indoles. Optimal results obtained employing a complex tethered an electron-rich, p-methoxy-substituted pyridine. catalysis showed high selectivity, yielding clean product...

Ein Hoch auf den Träger: Die Cycloisomerisierung von 2-Alkinylanilinen zu Indolen wird durch kationische Au-Nanopartikel (NPs) einem Kohlenstoffträger katalysiert. Elektronisch neutrale und elektronenreiche 2-Arylindole wandeln sich oxidative Homokupplung weiter in 3,3′-Biindole um; dieser Schritt ebenfalls glatt Au-NPs Kohlenstoff katalysiert, aber ebenso, wenn auch langsamer, alleine.

The reaction of β- and γ-haloamines with carbon dioxide to give pharmaceutically relevant 2-oxazolidinones 1,3-dioxazin-2-ones, was found proceed efficiently in the presence a base absence catalyst. After optimization conditions, system successfully expanded variety haloamines, even at multigram scale. further studied silico by DFT calculations.

Abstract 5‐Hydroxymethylfurfural (HMF) is a pivotal chemical in the utilization of biomass as feedstock. For this approach vast majority methods require access to pure HMF from before its utilization, which incorporates one or more purification steps that obstruct industrial implementation. We describe an operationally simple and versatile method encompasses both dehydration several carbohydrate substrates into subsequently direct conversion various high value‐added furan derivatives one‐pot...

Abstract The addition of Barton's base has a dramatic effect on the classic rhodium(III)‐mediated hydrogenations promoted by Wilkinson′s catalyst. Following initial oxidative addition, barrierless reductive elimination HCl from traditional rhodium(III) intermediates instantly produces rhodium(I) monohydride species, which is remarkably reactive in hydrogenation several internal alkynes and functionalized trisubstituted alkenes. direct formation this species unprecedented upon molecular...

N-aryl-oxazolidinones is a prominent family of antimicrobials used for treating infections caused by clinically prevalent Gram-positive bacteria. Recently, boron-containing compounds have displayed intriguing potential in the antibiotic discovery setting. Herein, we report unprecedented introduction moiety such as an aryl boronic acid external region oxazolidinone structure via chemoselective acyl coupling reaction. As result, accessed series analogues with distal pharmacophore on scaffold....

Abstract Comprehensive spectroscopic kinetic studies illustrate an alternative mechanism for the traditional free‐carbene intermediated H/D exchange reaction of 1,3‐dialkylimidazolium salts under neutral (D 2 O) and acidic conditions (DCl/D O 35 wt % solution). The deuteration high purity [bmim]Cl in D is studied at different temperatures, absence catalyst or impurities, to yield activation energy. DFT transition‐state modelling, a small water cluster [bmim] cation, also yields energy which...

A novel N5-dinucleating ligand 4-amino-3,5-bis(bipyridine-2-yl)-1,2,4-triazole allows the preparation for first time, and under mild conditions, of single mixed amido(R–NH−)-bridged copper(II) complexes, latter exhibiting very strong ferromagnetic coupling.

The reaction between Hmbpymca ligand (prepared in situ from the hydrolysis of 5-methyl-4-cyano-bispyrimidine with NaOH and further neutralization 2 M HCl) Mn(ClO4)2·4H2O 1 : molar ratio afforded triangulo-trimanganese(II) complex [Mn3(bpymca)3(H2O)6]Cl3·6H2O 1. chloride anions this come HCl used process. molecular structure consists cationic triangles [Mn3(μ-mbpymca)3(H2O)6]3+ C3 symmetry, crystallization water molecules, all them involved an extensive network hydrogen bonds, leading to a...

Abstract The addition of Barton's base has a dramatic effect on the classic rhodium(III)‐mediated hydrogenations promoted by Wilkinson′s catalyst. Following initial oxidative addition, barrierless reductive elimination HCl from traditional rhodium(III) intermediates instantly produces rhodium(I) monohydride species, which is remarkably reactive in hydrogenation several internal alkynes and functionalized trisubstituted alkenes. direct formation this species unprecedented upon molecular...

3D iDOSY-HMBC pulse sequences allow the simplification of HMBC data mixtures via separation in diffusion domain. The presented methods utilize incorporated DOSY approach, iDOSY, where existing delays basic sequence are utilized for attenuation. In simplest form proposed sequences, no extra or RF-pulses were required, only two gradients added within polarization transfer delay.

Abstract Comprehensive spectroscopic kinetic studies illustrate an alternative mechanism for the traditional free‐carbene intermediated H/D exchange reaction of 1,3‐dialkylimidazolium salts under neutral (D 2 O) and acidic conditions (DCl/D O 35 wt % solution). The deuteration high purity [bmim]Cl in D is studied at different temperatures, absence catalyst or impurities, to yield activation energy. DFT transition‐state modelling, a small water cluster [bmim] cation, also yields energy which...

Abstract Review: 22 refs.

Abstract The cycloisomerization of 2‐alkynyl substituted anilines (I) is studied using a heterogeneous gold on carbon catalysts.

Abstract β‐ and γ‐Haloamines react readily in the presence of a base absence any catalyst to produce desired heterocycles as synthons antibiotics.