Reactions that lead to destruction of aromatic ring systems often require harsh conditions and, thus, take place with poor selectivities. Selective partial dearomatization fused arenes is even more challenging but can be a strategic approach creating versatile, complex polycyclic frameworks. Herein we describe general organophotoredox for the chemo- and regioselective structurally diverse aromatics, including quinolines, isoquinolines, quinoxalines, naphthalenes, anthracenes phenanthrenes....

Crystal structure determination is the key to a detailed understanding of crystalline materials and their properties. This requires either single crystals or high-quality single-phase powder X-ray diffraction data. The present contribution demonstrates novel method reconstruct data from patterns mixtures several components subsequently determine individual crystal structures. new does not require recourse any database known but relies purely on numerical separation mixture into component...

Chlorinated coumarins, which are as cytotoxic highly toxic halobenzoquinones toward CHO-K1 cells, have recently been identified disinfection byproducts in drinking water processes. Therefore, detecting coumarins samples collected at various stages from treatment plants helps assess the formation of chlorinated water. Hence, a simple, rapid, accurate, and sensitive method for quantifying is required. In this study, was developed based on solid-phase extraction coupled with high performance...

A high AA selectivity of 84% was achieved through an environmentally friendly and sustainable catalytic process.

Abstract In this study, we report a series of bimetallic Ni−WO x catalyst for the ring‐opening THFA into 15PDO. The structure‐performance relationship catalysts was discussed based on extensive characterization using techniques such as BET, H 2 ‐TPR, NH 3 ‐TPD, Pyr‐IR, IPA‐TPD‐MS, XRD, XPS and EXAFS/XANES. acidity measurements show that higher W density leads to amount acid density, which could be assigned creation Lewis sites mainly surface calcined catalysts. ‐TPR profiles there is strong...

Abstract This work reports the individual role of strong Lewis base sites on catalytic conversion glucose hydrogenolysis to acetol/lactic acid, including isomerisation fructose and pyruvaldehyde rearrangement/hydrogenation acid. La 2 O 3 , Nd Sm Pr 6 11 were selected as representative oxides consisting different sites. The basicity these lanthanide was characterised by CO ‐TPD DRIFT spectroscopy. It found that cation‐oxygen pairs, Brønsted OH group coordinated with one Lanthanide cation,...

The adsorption of NO and CO was studied on an alumina-supported palladium catalyst by in situdiffuse reflectance infrared spectroscopy (DRIFTS). temperature range 50–160 °C a wide variety partial pressures used. band-target entropy minimization (BTEM) algorithm applied to the DRIFTS data sets resulting pure component spectra numerous species adsorbed both Pd (primarily Pd–CO Pd–NO species, various oxidation states coordinations) alumina surface (i.e. nitrates, nitrites, carbonates,...

The inter-conversions of platinum carbonyl dianionic clusters, ([Pt3(CO)6]n2−, n = 2–5), have been studied in THF and acetonitrile using situ FTIR spectroscopy. These were facilitated by the addition (or removal) molecular hydrogen. individual reactions, namely reductions oxidations [Pt3(CO)6]n2− fast reversible. BTEM analysis data provided pure component spectra species without need for physical separation. It is shown, first time, that (n 2) can be formed from reduction 3–5) hydrogen alone...

Cyclopentene hydroformylation, both stoichiometric and catalytic, is performed starting with Rh4(CO)12 CpW(CO)3H as precursors. Synergism observed. Isotopic labeling experiments confirm 30% of the product formation occurs via a catalytic binuclear elimination reaction. Two new intermediates are spectroscopically identified using band target entropy minimization DFT, namely, RhW(CO)7Cp CpW(CO)3H-C5H9CORh(CO)4. The latter intermediate appears to be hydrogen bonded two simultaneous...

The ordered mesoporous Ni–Zr–Al catalyst exhibits high hydrothermal stability as well anti-coking and anti-sintering properties, due to the confinement effect of mesopore channels incorporation ZrO₂ species.

Chiral quaternary α-aryl amino acids are biologically valued but synthetically challenging building blocks. Herein, we report a strategy for the synthesis of molecular architectures by unifying photoredox catalytic asymmetric Giese-type reaction and Clayden rearrangement. A new class chiral Karady–Beckwith dehydroalanines is designed serves as versatile handle photoredox-mediated highly stereoselective with feedstock carboxylic tertiary amines. Subsequent rearrangement delivers acid...

The adsorption of NO and CO was studied on an alumina-supported platinum catalyst by in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS). temperature range 50–160 °C a wide variety partial pressures used. band-target entropy minimization (BTEM) algorithm applied to the DRIFTS data sets resulting pure component spectra numerous species adsorbed both Pt (primarily Pt0–CO Pt2+–CO species) alumina surface (i.e. nitrates, nitrites, bicarbonates, isocyanates) as well...

Two organic reactions, namely the reaction of cyclopentadiene (CPD) and dimethyl acetylene dicarboxylate (DMAD) dimerization CPD were conducted in toluene at 298.1 K atmospheric pressure measured by situ FTIR spectroscopy. Band-target entropy minimization (BTEM) analyses employed for obtaining pure component spectra solutes their corresponding concentrations. The solute concentrations bulk density data used to evaluate partial molar volumes constituents. evaluated from this multi-component...

Two useful numerical methods using ultraviolet (UV) and circular dichroism (CD) spectroscopies are proposed to determine enantiomeric excess (e.e). An algorithm is also generate self-consistent pure R S enantiomer reference spectra. After all spectra generated, a simulated annealing applied minimize the mismatch between experimental after least-squares fit. Optimal factors for enantiomers then used e.e. The ultraviolet–circular (UV-CD) method uses combined UV CD in composite form, while...