The dielectric properties of epoxy nanocomposites with insulating nano-fillers, viz., TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , ZnO and AI O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> were investigated at low filler concentrations by weight. Epoxy nanocomposite samples a good dispersion nanoparticles in the matrix prepared experiments performed to measure permittivity tan delta (400 Hz-1 MHz), dc volume resistivity ac...

The highly enantioselective [5 + 2] annulation of enals with vinylethylene carbonates through a cooperative N-heterocyclic carbene (NHC)/Pd catalytic system is reported. use bidentate phosphine ligand was crucial to prevent coordination the NHC organocatalyst active Pd catalyst. complementary and matched combination chiral catalyst promotes high levels both reactivity enantioselectivity (mostly ≥99% ee).

To achieve a compact and reliable design of electrical equipment for the present day requirements, there is an urgent need better smart insulating materials in this respect, reported enhancements dielectric properties obtained polymer nanocomposites seems to be very encouraging. further understand behavior nanocomposites, experimental work reports trends permittivities tan delta (loss tangent) epoxy with single nano-fillers Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

The first template assisted <italic>meta</italic>-hydroxylation strategy and its use in the synthesis of resveratrol precursor QR-activity inducer with detailed experimental <italic>in-silico</italic> mechanistic understanding.

An unprecedented MnI -catalyzed (2-indolyl)methylation of heteroarenes is reported. This method makes use an aromatizing cascade strategy to install a (2-indolyl)methyl group into target molecules, thereby leading the expedient synthesis previously challenging and important unsymmetrical diheteroarylmethanes, in particular bis(2-indolyl)methanes. The proposed process comprises reorganization multiple bonds with controlled regioselectivity high atom economy can be performed on gram-scale....

Heterobimetallic bismuth–rhodium paddlewheel complexes with phenylglycine ligands carrying TIPS-groups at the meta-positions of aromatic ring exhibit outstanding levels selectivity in reactions donor/acceptor and donor/donor carbenes; same time, reaction rates are much faster substrate scope is considerably wider than those previous generations chiral [BiRh] catalysts. As shown by a combined experimental, crystallographic, computational study, new catalysts draw their excellent application...

Experimental investigations into the dielectric properties of epoxy-ZnO nanocomposites at different filler loadings reveal few unique behaviors (at certain loadings) and also advantageous characteristics in contrast to obtained for corresponding microcomposites. Results demonstrate that nanocomposites, it is possible achieve lower values permittivity tandelta with respect unfilled epoxy over a wide frequency range. Analysis results attributes this interesting observation interaction dynamics...

This paper presents a comparative evaluation of the aging characteristics between high oleic natural ester dielectric liquid (HONE) and mineral oil based on an accelerated single-temperature thermal experiment at 150°C for period 3000 hours. The important physical (e.g., viscosity, moisture content, acidity) power factor, alternating current (AC) breakdown) properties both oils were measured analyzed different intervals. As expected, results show differences in behaviors liquid. relative...

The activation of 2-(bromomethyl)benzaldehydes using N-heterocyclic carbenes represents a novel approach to the generation o-quinodimethane (o-QDM) intermediates. Coupling with ketones such as phenylglyoxylates, isatins, or trifluoromethyl via [4 + 2] annulation gives access functionalized 1-isochromanones.

This paper presents a comparative evaluation of the aging characteristics between high oleic natural ester dielectric liquid (HONE) and mineral oil based on an accelerated single-temperature thermal experiment at 150°C for period 3000 hours. The important physical (e.g., viscosity, moisture content, acidity) power factor, alternating current (AC) breakdown) properties both oils were measured analyzed different intervals. As expected, results show differences in behaviors liquid. relative...

Chimeric small molecules that induce post-translational modification (PTM) on a target protein by bringing it into proximity to PTM-inducing enzyme are furnishing novel modalities perturb function. Despite recent advances, such unavailable for critical PTM, tyrosine phosphorylation. Furthermore, the contemporary design paradigm of chimeric molecules, formed joining noninhibitory binder with protein, prohibits recruitment most enzymes as their binders unavailable. Here, we report two...

In this letter, we experimentally demonstrate that the lightning impulse breakdown characteristics of natural ester liquids can be significantly enhanced by dispersing molecular additives possessing lower values both ionization potential and 1st excitation energies as compared to base liquid. One such additive contributed an increase in acceleration voltage liquid 32% 90%, respectively. Apart from expected influence low additives, results also indicate a positive effect value energy.

Abstract A Truce–Smiles rearrangement of acyl‐anion equivalents generated by N‐heterocyclic carbene (NHC) catalysis has been achieved. The developed method includes C Ar −O, −S, or −N bond cleavage for the formation a −C and enables access to 2‐hydroxybenzophenones, an important structural motif that is present in several bioactive natural products. By utilizing this procedure, alkaloid taxilamine was synthesized three steps. DFT calculations control experiments support classical S N...

Heterobimetallic [BiRh] tetracarboxylate catalysts endowed with 1,3-disilylated phenylglycine paddlewheels benefit from interligand London dispersion. They were originally designed for asymmetric cyclopropanation but are now shown to perform very well in C-H functionalization reactions too. Because of the confined ligand sphere about derived donor/acceptor carbenes, insertions into unhindered methyl groups kinetically favored, although methylene units also react excellent levels induction;...

The complex permittivity characteristics of epoxy nanocomposite systems were examined and an attempt has been made to understand the underlying physics governing some unique macroscopic dielectric behaviors. experimental investigations performed using two different with low filler concentrations over frequency range 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> -400 Hz, but for cases, data reported upto...

This work reports on an experimental study of the aging behavior thin films different classes natural ester dielectric liquids. Thin film samples three liquids were prepared for investigations and experiments performed in a medium dry air at temperatures (23°C 65°C) durations (up to around 100 days). The degradation was then evaluated terms changes dynamic viscosity liquid. Further analyses also aged through visual inspection, Infrared (IR) spectroscopy analysis Oxidative Induction Time...

Abstract Eine neuartige Mn I ‐katalysierte (2‐Indolyl)methylierung von Heteroarenen wird beschrieben. Diese Methode nutzt eine Aromatisierungskaskadenstrategie, um (2‐Indolyl)methyl‐Gruppe im Produkt einzubauen, was zur einfachen Synthese vorher schwer herzustellenden, wichtigen unsymmetrischen Diheteroarylmethan‐Derivaten, insbesondere Bis(2‐indolyl)methan‐Derivaten, führt. Der vorgeschlagene Kaskadenprozess umfasst die Reorganisation mehreren Bindungen bei kontrollierter Regioselektivität...

One of the biggest challenges when considering polymer nanocomposites for electrical insulation applications lies in determining their properties accurately, which turn depend on several factors, primary being dispersion particles matrix. With this background, paper reports an experimental study to understand effects different processing techniques filler matrix and related effect dielectric composites. Polymer composite nanocomposite samples were prepared by mixing 10% weight commercially...

In recent times, there has been an ever-growing need for polymer-based multifunctional materials electronic packaging applications. this direction, epoxy-Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> nanocomposites at low filler loadings can provide excellent material option, especially from the point of view their dielectric properties. This paper reports characteristics such a...

Experimental studies reveal a reduction in the values of permittivity for epoxy nanocomposites at low filler loadings as compared to neat over wide frequency range. This is attributed interaction dynamics between nanoparticles and chains interface region interestingly, this has also been found influence glass transition temperatures (T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</sub> ) examined nanocomposite systems. Accordingly, dual...

Molecular additives i.e. with specific molelcular propertie, has been shown to influence breakdown properties of dielectric liquids, in particular lightning impulse characteristics. In this study we investigate the propagation streamers a natural ester liquid and without molecular needle plane electrode configuration 5 mm gap. order streamer propagation, including fast events, such small gap, voltages 20-40 ns rise times are used. One additive, dimethylaniline, low ionization potential...

Abstract [Rh 2 (MEPY) 4 ] is a versatile catalyst for asymmetric synthesis but its preparation requires purification by chromatography on surface‐modified silica. A higher yielding procedure based more convenient work‐up presented herein. Moreover, much improved method the of [BiRh(OTfa) described, which makes this heterobimetallic complex readily available. Subsequent exchange trifluoroacetate ligands opens access to so far underappreciated family (chiral) paddlewheel complexes. While...