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Article
Innovative technology for recycling the negative segments of alkaline batteries using recoverable solvent
Technology is presented for recycling the negative segments of nickel-cadmium batteries based on the use of sodium ethyelenediaminetetraacetate (EDTA) as a leaching (complex-forming) reagent. Methods are propo...
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Article
Thermodynamics of reactions during nitric acid leaching of minerals of a copper concentrate
Conditions for the effective dissolution of sulfides without the isolation of elemental sulfur and iron oxides are determined at 20 and 100°C using “potential-pH” thermodynamic diagrams in the Cu-Fe-S-N-O-H sy...
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Article
Transformations of coumarins accompanied by intermediate opening and recyclization of the lactone ring 3.* Study of the reactions of 3-ethoxy-carbonylcoumarins with cyanoacetyl-hydrazines by NMR spectroscopy
The reaction of 3-ethoxycarbonylcoumarin with derivatives of cyanoacetylhydrazine directly in the sample tube of the NMR spectrometer was investigated by 1H NMR spectroscopy. The structure of the components of th...
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Article
Investigation of the selective leaching of cadmium from the active mass of alkali accumulators
During laboratory studies, the optimum conditions of leaching cadmium from the active mass of alkali accumulators in solutions of sodium ethylenediamine tetraacetate are established. At pH > 7, L: S = 7: 1, and t
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Article
Removal of impurities from lead-trilonate solutions with regeneration of the solvent
Laboratory investigations of purification of trilonate solutions obtained during leaching of lead cakes of zinc production are carried out. Using the method of potentiometric titration, the conditions of forma...
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Article
Leaching of lead cakes of zinc production in a complexing solvent
The process of leaching of lead cakes of zinc production in a complexing solvent—trilon B, which makes it possible to selectively extract lead into the solution—is studied with the use of mathematical modeling of...
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Article
New synthesis of pyrido[4,3-b]indoles (γ-carbolines) on the basis of indolin-2-one lactim ether
Condensation of indolin-2-one (oxindole) lactim ether with malononitrile leads to 2-dicyanomethylidene-2,3-dihydroindole, the reaction of which with dimethylformamide diethyl acetal (or with triethyl orthoform...
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Article
Synthesis, properties, and reactions of derivatives of 1,3-dimethyl-6-(5′-aminopyrimidylthio-6′)uracils
Derivatives of 1,3-dimethyl-6-(5′-aminopyrimidylthio-6′)uracils were synthesized and some of their properties and reactions were studied.
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Article
Develo** analytical methods for the creation of the state reference sample of noopept
The physicochemical properties of noopept, a new domestic original drug with nootropic action, have been studied with a view to develo** analytical methods, establishing quality criteria for the parent drug ...
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Article
New synthesis of benzo[b][1,6]naphthyridines and pyrido[4,3-b]benz[f]azepines from lactim ethers of 3,4-dihydrocarbostyril and 1H-2,3,4,5-tetrahydrobenz[b]azepin-2-one
Condensation of lactim ethers of 3,4-dihydrocarbostyril and 1H-2,3,4,5-tetrahydrobenz[b]azepin-2-one with malonodinitrile, cyanoacetamide, and ethyl cyanoacetate gave the corresponding 2-methylidene derivatives. ...
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Article
Sesquiterpene lactones in juice of great burdock leaves
The chemical composition of the juice of freshly collected great burdock (Arctium Lappa L.) leaves was studied. The main components in the ethyl acetate extract were determined. Adifference between the samples co...
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Article
Heterocyclic analogs of 5,12-naphthacenequinone. 2. Synthesis of 4,11-dihydroxynaphtho[2,3-f]indazole-5,10-dione and its n-methyl derivatives
On methylating 4,11-dimethoxynaphtho[2,3-f]indazole-5,10-dione with methyl iodide in the presence of base a mixture is formed of its 1-and 2-methyl derivatives. Demethylation of the methoxy groups of the start...
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Article
Conversions of Coumarins Accompanied by Intermediate Opening and Recyclization of the Lactone Ring. 2. Study of the Interaction of Malonic Acid Hydrazide and Amide Derivatives with 3-Acyl(3-cyano, 3-ethoxycarbonyl)Coumarins
Reaction between the N,N′-diisopropylidene and N,N′-diacetyl derivatives of malonic acid dihydrazide and 3-acyl(3-cyano, 3-ethoxycarbonyl)coumarins under the conditions of the Michael reaction lead to the form...
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Article
Study of Nitrogen- and Sulfur-Containing Heterocycles. 57. Synthesis and Conversion of 4′-Substituted 5-(5-Amino-6-Pyrimidylthio)-2,2-Dimethyl-4,6-Dioxo-1,3-Dioxanes
By reaction of 4-substituted 5-amino-6-mercaptopyrimidines with 5-bromo-2,2-dimethyl-4,6-dioxo-1,3-dioxane, we have obtained 4′-substituted 5-(5-amino-6-pyrimidylthio)-2,2-dimethyl-4,6-dioxo-1,3-dioxanes. We h...
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Article
Identification and Analysis of γ-Aminobutyric Acid in Culture Media of Producing Strains
A new modification of the accq-tag-HPLC technique for the rapid determination of L-proline and γ-aminobutyric acid (GABA) in a culture medium is proposed. The concentration of L-isoleucine added to the culture me...
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Article
Study of nitrogen- and sulfur-containing heterocycles. 54. Properties and conversions of pyrimido[4,5-b]-1,4-benzothiazepines. Synthesis of a novel heterocyclic system: Pyrimido[5,4-c]isoquinoline
We have studied some properties and conversions of pyrimido[4,5-b]-1,4-benzothiazepines: reduction, oxidation, reactions with nucleophilic reagents (methanol, hydrazine, hydroxylamine, o-methylhydroxylamine, a...
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Article
Conversion of Coumarins Accompanied by Opening and Recyclization of the Lactone Ring. 1. Study of the Reaction of 3-Ethoxycarbonyl(3-acyl)coumarins with Cyanoacetylhydrazine and Its Derivatives
A stepwise sequence for the interaction of 3-ethoxycarbonyl(acyl)coumarins with cyanoacetylhydrazine, its N-acetyl and N-isopropylidene derivatives, leading to the formation of 3-cyanocoumarins, is proposed an...
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Article
Synthesis and Biological Properties of Arylthio-1,2,3-Triazole Derivatives
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Article
Synthesis and Study of Lactim Ethers of 3,4-Dihydrocarbostyryl and 2,3,4,5-Tetrahydrobenz[b]azepin-2-one
Alkylation of 3,4-dihydrocarbostyryl and 2,3,4,5-tetrahydrobenz[b]azepin-2-one using dimethyl sulfate and triethyloxonium fluoborate gives the corresponding lactim ethers. The reactions of lactim ethers with diff...
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Article
New Approach to the Synthesis of 3-Arylcoumarins. Reaction of 3-Acyl- and 3-Ethoxycarbonylcoumarins with Hydrazide of p-Nitrophenylacetic Acid
