Photochemical and Photophysical Processes of N-Deacetyllappaconitine and Its Monohydrobromide in Aqueous Solutions

Chemistry of Natural Compounds - The photophysical and photochemical processes of N-deacetyllappaconitine (DAL) and its hydrobromide (DAL·HBr) in aqueous solutions were investigated. Their...     

New Approaches to the Synthesis of Titanium Phosphates from Crystalline Precursors

Doklady Chemistry - The possibility to synthesize titanium phosphate from crystalline titanium salts has been shown for the first time. Optimal synthesis conditions have been found to provide...     

(Mg,Ni)Ga2O4 Solid Solution with a Spinel Structure

Doklady Chemistry - The boundaries of Mg1 – xNixGa2O4 solid solutions (0 ≤ х ≤ 0.5) with a spinel structure synthesized by the gel combustion method,...     

Chemical Composition of Flowers of Gossypium hirsutum

Chemistry of Natural Compounds -     

Metabolites of Artemisia juncea and their Effect on Regulation of Thymocyte Volume

Chemistry of Natural Compounds -     

Development of a mobile radon calibration system at KRISS

Journal of Radioanalytical and Nuclear Chemistry - A mobile radon calibration system was developed with a high-sensitivity radon detector, a movable calibration chamber, and a 226Ra solid source at...     

Synthesis and characterization of novel hybrid compounds containing coumarin and benzodiazepine rings based on dye

Coumarin derivatives, one of the organic fluorescent materials, are widely applied in many areas such as laser dyes, organic light emitting diodes (OLED), pharmaceuticals and bio/chemosensors, with the advantages of the large conjugated system and planar structure. In the coumarin analogs, which are polarity sensitive fluorophores, a shift to the red zone is observed in the case of π expansion at 3-positions and electron donor groups at 7-positions. The present article reports the synthesis of novel hybrid compounds ( CD1-CD8 ) containing coumarin and benzodiazepine rings using ethyl 3-(7-(diethylamino)-2-oxo-2H-chromen-3-yl)-3-oxopropanoate reagent and 1,2-diaminobenzene derivatives under optimized reaction conditions with PTSA catalyst. The structures of target compounds synthesized were characterized by FTIR, ¹HNMR, ¹³CNMR, HRMS and UV–Vis spectra. The effects of electron withdrawing and electron donor groups in the cyclocondensation reaction that takes place as regioselective were evaluated in detail. The substituent effects were investigated for n-π* and π-π* electronic transitions in UV–Vis Spectroscopy.     

Catalytic Sc(OTf)3 mediated direct asymmetric aldol reaction of (−)-menthyl isothiocyanatoacetate with aldehydes by using (−)-menthol as chiral auxiliary

This method involves the direct asymmetric aldol reaction of (−)-menthyl isothiocyanatoacetate 5 with a variety of substituted aromatic aldehydes, which offers a convenient method for the synthesis of intermediate containing biologically relevant α-amino β-hydroxyl groups in oxazolidine ring. In this methodology, the products show remarkable diastereoselectivity using Sc(OTf)₃ as a catalyst and easily accessible (−)-menthol as a chiral auxiliary. This approach includes some important aspects such as mild reaction conditions, high yields, and excellent diastereoselectivity with a number of substituted aromatic aldehydes. The optimization and effect of different catalysts were studied at different reaction conditions and it is found that Sc(OTf)₃ shows excellent diastereoselectivity at −45°C.     

DIELECTRIC LAYERS BCxNy: SYNTHESIS BY THE DECOMPOSITION OF VAPORS OF ORGANOBORON COMPOUNDS,COMPOSITION AND CHEMICAL STRUCTURE

Journal of Structural Chemistry - Composition, chemical structure, and dielectric characteristics of boron carbonitride films BCxNy prepared by chemical vapor deposition upon thermal and plasma...     

FTIR SPECTRAL STUDIES OF THE BINARY SOLUTIONS OF ACETONE WITH XYLENE ISOMERS

Journal of Structural Chemistry - FTIR spectra of neat acetone (ACT), xylene isomers (o-xylene (OXY), m-xylene (MXY), and p-xylene (PXY)) and their binary solutions at various ACT molar...