New types of reagents, bis (2,4,6-trihalophenoxy)trichlorophosphoranes, were very effective as condensing agents for internucleotidic bond formation in the phosphotriester method. The 31P NMR study showed that the condensation proceeded via phosphorochloridate intermediates.

The electronic absorption and fluorescence spectra of coumarin derivative, (S)-(1-((7-hydroxy-2-oxo-2H-chromen-4-yl)methyl)-1H-1,2,3-triazol-4-yl)methyl2-(((9H-fluoren-9-yl)methoxy)cabonylamino)-3-phenylpropanoate have been studied in solvents of different polarities, and the data were used to s...

An efficient one-pot synthesis of 3-((aryl)(diethylamino)methyl)-4-hydroxy-2H-chromen-2-one derivatives has been developed from diethyl amine, aromatic aldehyde and 4-hydroxy coumarin via Mannich type reaction in the presence of Bi(NO3)3·5H2O. Also, the reaction of arylaldehyde, 4-hydroxy couma...

A series of novel 10-(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)-3-methyl-1H,10H-pyrano[4,3-b]chromen-1-ones were synthesized by a pseudo-three-component reaction of 4-hydroxy-6-methyl-2-oxo-2H-pyran-2-one (TAL) with 2-hydroxyarylaldehydes using different acids as catalysts and solvents. The approa...

Reaction of nitrosochlorides of natural monoterpene hydrocarbons (+)-3-carene and (−)-α-pinene with L-amino acids and their methyl esters results in stereoselective formation of terpene–amino acids hybrids, which belong to the series of α-substituted amino oximes. The reaction with an excess ...

The acid-catalyzed rearrangement of epoxide 3a and 8a derived from sesquiterpernic isocostic acid (1), the main component of Dittrichia viscosa, was studied using Lewis and Brönsted acids. Several new compounds were obtained with different selectivities depending on the catalyst used. These comp...

Light is an energy source and key environmental factor for plants. Out of the different light wavelengths, blue-light is one of the most relevant spectral regions because of its relation to anthocyanins biosynthesis. Among the compounds present in grapes, anthocyanins determine their main organo...

We are interested in new non-natural glycosides with sialic acid conjugates and their biological activities. We report the synthesis of eleven non-natural occurring glycosides, which are triterpene (glycyrrhetinic acid and its derivatives)-sialic acid conjugates, and their inhibitory activities ...

Density functional theory (DFT) calculations have been conducted on a new series of hybrid inorganic-organic acids. One of the oxygen double bonded to nitrogen in nitric acid has been systematically substituted with the different groups such as cyclopentadiene, indene, and borole motifs and the ...

A diversity of poly(bis-3,4-ethylenedioxythiophene methane)s have been carefully designed and synthesized by chemical oxidation polymerization and then been employed as novel counter electrodes in dye-sensitized solar cell (DSC). The relationship between monomer structures and their effects on D...

In this paper the synthesis and spectral properties of three new dimeric bis(BODIPY)s with two indacene domains connected by a methylene (–CH2–) spacer at 2,2-, 2,3- or 3,3- positions were reported. It was found bis(BODIPY)s exhibit a high sensitivity of fluorescence to the medium properties. ...

Four new Cu(II) complexes and one Zn(II) complex of the formula {Cu(salChx)}2n⋅nCH3OH, [Cu(salChx)(imidazole)], [Cu(salChx)(pyrazole)], [Zn2(μ-salChx)2(CH3OH)2] and [Cu2(μ-MeOsalChx)(MeOsalChx)(H2O)2]4⋅3H2O (where salChx is dianion of Schiff-base ligand obtained by condensation of salicylaldeh...

Oxidation of 5×10−3 M noradrenaline in aqueous phosphate buffer, pH 7.4, with K3Fe(CN)6, NaIO4 or Fe2+/EDTA/H2O2 followed by extraction with ethyl acetate and acetylation with Ac2O/Pyr led to a main reaction product which was isolated and identified as 4-[bis-(1H-5,6-diacetoxyindol-2-yl)methyl]...

Several catecholamines have been converted to 5,6-diacetoxyindole derivatives by the use of mushroom tyrosinase as oxidant.

Interest in the development of radiopharmaceuticals suitable for the diagnosis and treatment of malignant melanoma prompted the present study. One of the first approaches to this problem has involved the synthesis of suitably labeled precursors of melanin with the hope that these substances woul...

Chloromethylation of p-toluic acid affords 3,5-bis(chloro- methyl)-4-methylbenzoic acid whose subsequent treatment with arenethiols brings about spacer dendrimeric blocks containing polyfluoroarylsulfanyl fragments in a total yield of 60-75%.

Infinite dilution activity coefficients (γ∞) were measured at 298 K for 12 different aliphatic hydrocarbons (alkanes, cycloalkanes, alkenes), 11 different aromatic compounds (benzene, alkylbenzenes, halobenzenes, naphthalene), and 2-chloro-2-methylpropane dissolved in 2-butoxyethanol at 298 K ...

Infinite dilution activity coefficients (γ∞) were measured at 298 K for 13 different aliphatic hydrocarbons (alkanes, cycloalkanes, alkenes), 12 different aromatic compounds (benzene, alkylbenzenes, halobenzenes, naphthalene), and 2-chloro-2-methylpropane dissolved in 2-ethoxyethanol, along wi...

Experimental solubilities have been determined for acenaphthene, biphenyl, benzoic acid, 3-nitrobenzoic acid, 4-nitrobenzoic acid, 2-methoxybenzoic acid, 4-methoxybenzoic acid, 3,4-dimethoxybenzoic acid, 4-aminobenzoic acid, 4-chlorobenzoic acid, 3,5-dinitro-2-methylbenzoic acid, 2-methylbenzoic...

Pyridine-containing luminophores have been attracting much attention due to pyridine functions in carrier transport and cation complexation. Here we prepared a butterfly-like molecule 9,10-bis(2-phenyl-2-(pyridin-2-yl)vinyl)anthracene (PyVA) for developing new multifunctional dyes. The multiple ...