CsCO-Catalyzed Rauhut-Currier-Type Reaction for the Synthesis of 2,3-Dihydrobenzo[]oxepin Derivatives.

The synthesis of fused benzoxepines relies on the use of complex substrates and methodologies. Herein, we report our experimental and theoretical findings about an unprecedented Rauhut-Currier-type reaction catalyzed by CsCO to access these important compounds. The developed methodology avoids the use of phosphine- or amine-based catalysts and additives.

Correction: Photoluminescence modification of europium(III)-doped MAlO (M = Zn, Mg) spinels induced by Ag@SiO core-shell nanoparticles.

Correction for 'Photoluminescence modification of europium(III)-doped MAlO (M = Zn, Mg) spinels induced by Ag@SiO core-shell nanoparticles' by Rodrigo A. Valenzuela-Fernández , , 2024, https://doi.org/10.

Photoluminescence modification of europium(III)-doped MAlO (M = Zn, Mg) spinels induced by Ag@SiO core-shell nanoparticles.

In recent years, there has been an increasing interest in developing new inorganic compounds with exceptional properties for advanced materials. Specifically, compounds containing europium have attracted much attention due to their luminescent properties. These compounds are used in electronics, biotechnology, medicine, and catalysis.

Non-covalent interactions in the diastereoselective synthesis of -2,3-dihydrobenzofurans: experimental and computational studies.

The diastereoselective synthesis of 2,3-DHBs has been previously reported an intramolecular Michael addition reaction using alkali bases such as CsCO and KCO. However, no systematic study has been performed to understand the possible role of bases in the mechanism of the reaction and factors behind the stereoselective outcome of the reaction. Herein, from experimental and theoretical points of view, we disclose the role of the cesium salt in the rate-determining step along the catalytic cycle and the key role of stabilizing non-covalent interactions in the stereoselective outcome of the reaction.

Structural Characterization and Thermoelectric Properties of Br-Doped AgSn[SbBi]Te Systems.

Herein, we report the synthesis, structural and microstructural characterization, and thermoelectric properties of AgSn[SbBi]Te and Br-doped telluride systems. These compounds were prepared by solid-state reaction at high temperature. Powder X-ray diffraction data reveal that these samples exhibit crystal structures related to the NaCl-type lattice.

Rerefinement of the crystal structure of SnTeSe from single-crystal X-ray diffraction data.

Compounds of the solid solution series SnTe Se , derived from pristine SnSe and SnTe, are considered as thermoelectric lead-free materials. The crystal structure re-refinement of NaCl-type SnTeSe is based on single-crystal X-ray diffraction data and results in higher precision of the bond length [Sn-(Te,Se) = 3.0798 (3) Å] compared to a previous report on basis of powder X-ray data [Krebs & Langner (1964 ▸).

(Cu)(CrSn)SSe Spinels: Crystal Structure, Density Functional Theory Calculations, and Magnetic Behavior.

A new series of (Cu)[CrSn]SSe compounds was prepared by solid-state reaction at high temperature. Determination of the crystal structures by single-crystal X-ray diffraction revealed that CuCrSnSSe, CuCrSnSSe, CuCrSnSSe, and CuCrSnSSe crystallize in a normal spinel-type structure (cubic 3 space group). The powder X-ray diffraction patterns and Rietveld refinements of nominal CuCrSnSSe ( = 0.

Influence of Non-Covalent Interactions in the - and Regioselectivity of Aza-Diels-Alder Reactions: Experimental and DFT Calculations.

A systematic experimental and theoretical study of the intermolecular Aza-Diels-Alder reaction using 5-aminopyrrole as a building block shows that the commonly accepted selectivity, ruled by controversial secondary orbital interactions, are overcome by non-covalent interactions affording to the unusual adduct. Additionally, the regioselectivity is also influenced for such interactions. The starting materials are easily prepared, and the use of water as the solvent is a great achievement for the development of cleaner synthetic methodologies.

Ultrasound-assisted synthesis of novel chalcone, heterochalcone and bis-chalcone derivatives and the evaluation of their antioxidant properties and as acetylcholinesterase inhibitors.

The chalcone and bis-chalcone derivatives have been synthesized under sonication conditions via Claisen-Schmidt condensation with KOH in ethanol at room temperature (20-89%). The structures were established on the basis of NMR, IR, Single-crystal XRD, and MS. The best compound 3u had inhibitory activity (IC = 7.

Development of an iron-selective antioxidant probe with protective effects on neuronal function.

Iron accumulation, oxidative stress and calcium signaling dysregulation are common pathognomonic signs of several neurodegenerative diseases, including Parkinson´s and Alzheimer's diseases, Friedreich ataxia and Huntington's disease. Given their therapeutic potential, the identification of multifunctional compounds that suppress these damaging features is highly desirable. Here, we report the synthesis and characterization of N-(1,3-dihydroxy-2-(hydroxymethyl)propan-2-yl)-2-(7-hydroxy-2-oxo-2H-chromen-4-yl)acetamide, named CT51, which exhibited potent free radical neutralizing activity both in vitro and in cells.

Efficient MW-Assisted Synthesis, Spectroscopic Characterization, X-ray and Antioxidant Properties of Indazole Derivatives.

A small series of tetrahydroindazoles was prepared, starting from 2-acetylcyclohexanone and different hydrazines using reflux and a focused microwave reactor. Microwave irradiation (MW) favored the formation of the desired products with improved yields and shortened reaction times. This is a simple and green method for the synthesis of substituted tetrahydroindazole derivatives.

Synthesis of coumarin derivatives as fluorescent probes for membrane and cell dynamics studies.

Three coumarin-derived fluorescent probes, 3-acetyl-7-[(6-bromohexyl)oxy]-2H-chromen-2-one (FM1), 7-[(6-bromohexyl)oxy]-4-methyl-2H-chromen-2-one (FM2) and ethyl 2-{7-[(6-bromohexyl)oxy]-2-oxo-2H-chromen-4-yl}acetate (FM3), are described, with their photophysical constants. The compounds were tested in preliminary studies employing epifluorescence microscopy demonstrating that they allow the imaging of human neuroblastoma SH-SY5Y cell membranes. The structure of FM3 was confirmed by X-ray crystallographic analysis.