卷 88, 编号 6 (2018)
- 年: 2018
- 文章: 46
- URL: https://journals.rcsi.science/1070-3632/issue/view/13698
Article
Phase Equilibria in the BiO1.5–CaO–CoOy System
摘要
Phase equilibria at subsolidus area of quasi-triple BiO1.5–CaO–CoOy system in air have been studied. The formation of triple oxide Bi2Ca2Co1.7Ox and limited number of solid solutions (Ca,Bi)3Co4O9+δ has been established. The triangulation of BiO1.5–CaO–CoOy system in air at 973 K has been carried out.
Physicochemical Properties of Highly Dispersed Iron Oxides Formed Inside Mesoporous Silica
摘要
Nanocomposites based on nanoparticles of iron oxides formed inside porous matrices were studied. Mesostructured silica material SBA-15 impregnated with an aqueous solution of iron(III) oxalate was heattreated in oxidizing (air) and reducing (Ar + 5% H2) media. The resulting samples exhibited small oxide particle sizes (ca. 5 nm) and sufficiently uniform distribution of iron whose content was ~16 wt %.
Optical Properties and Solubility of Ozone in CCl4 at Low Temperature
摘要
Ozone was concentrated in ССl4 matrix at successive cooling. It has been shown that absorption spectra of ozone in ССl4 (λmax 258 nm) are practically identical to these in an aqueous solution. Vibrational structure typical of gaseous ozone over the Chappuis range has been retained. Position and shape of the bands for the О3–ССl4 system are independent of temperature. Molar absorptivity of the Chappuis band has been measured (ε600 8.0±0.3 M–1 cm–1), on the basis of which limiting solubility of ozone in the CCl4 at 760 mmHg has been determined.
Acid-Base Equilibrium of 5-Methoxy-6-methyluracil in Solutions: Evaluation of Content of Anionic Forms in Aqueous Alkaline Solution
摘要
Dissociation constants of 5-methoxy-6-methyluracil, 5-methoxy-1,6-dimethyluracil and 5-methoxy-3,6-dimethyluracil in water are determined. Basing on the obtained рKа1 values, the content of anions in aqueous alkaline solution of 5-methoxy-6-methyluracil was calculated. The results were confirmed by the use of model compounds: 5-methoxy-1,6-dimethyluracil and 5-methoxy-3,6-dimethyluracil using the NMR spectroscopy.
Development of Chemical Polarization of Nuclei During Photolysis of Benzoquinones with Aromatic Amines
摘要
Formation of nuclei polarization via triplet mechanism has been observed and described, allowing reliable identification of ion-radicals stages of the reaction, estimation of the triplets and ion-radical pairs lifetime from the effects of chemical polarization of the nuclei. The data on relative values of isotropic and anisotropic interactions of unpaired electrons and nuclei have been obtained.
Reaction of Thiourea Dioxide and Hydrogen Peroxide with Coumarin
摘要
The system thiourea dioxide–hydrogen peroxide is found to effectively hydroxylate coumarin in aqueous solutions. The hydroxyl radical reacting with coumarin is shown to result from decomposition of the complex thiourea dioxide–H2O2. The obtained data are compared to the results of investigation of the reactions occurring in the system thiourea dioxide–H2O2 with terephthalic acid.
Reactions of 3-Arylhydrazono-2,4-dioxobutanoates with Hydrazine Hydrate
摘要
4-Substituted 3-arylhydrazono-2,4-dioxobutanoates acids esters undergo cyclization under the action of hydrazine hydrate to form 4-arylazo-3-pyrazolecarboxylic acids derivatives. The structure of the compounds obtained was determined from spectral methods.
Synthesis and Biological Activity of Compounds Obtained by Reacting Methyl Aroylpyruvates with Sulfadimidine
摘要
The reaction of methyl aroylpyruvates and 2-(4-aminobenzenesulfamido)-4,6-dimethylpyrimidine in glacial acetic acid in the presence of anhydrous sodium acetate afforded (2Z)-4-aryl-2-hydroxy-N-{4-[(4,6-dimethylpyrimidin-2-yl)sulfamoyl]phenyl}-4-oxobut-2-enamides. Reaction of the above reagents in a mixture of acetic acid and ethanol (1: 1) in the absence of anhydrous sodium acetate gave methyl (2Z)-4-aryl-2-{4-[(4,6-dimethylpyrimidin-2-yl)sulfamoyl]phenylamino}-4-oxobut-2-enoates. Analgesic and anti-inflammatory activities of the synthesized compounds was studied.
Synthesis and Structure of 2-(1Н-Indol-1-yl)-6-ferrocenyl-4-(2-chloroimidazo[1,2-a]pyridin-3-yl)pyrimidine
摘要
A 2,4,6-trisubstituted pyrimidine including a 2-(1H-indol-1-yl) substituent was synthesized by the reaction of 1-ferrocenyl-3-(2-chloroimidazo[1,2-a]pyridin-3-yl)propanone with 2,5-dimethoxytetrahydrofuran. The structure of the synthesized compound was confirmed by IR and 1Н NMR spectroscopy, and X-ray diffraction analysis. It has been shown that the ferrocene-containing compounds synthesized in the present work all demonstrate intramolecular charge transfer which is evidenced by the observation of the corresponding absorption bands with λmaxabs > 480 nm. The oxidation potential of ferrocene (EoxFc) in all the compounds is higher than 700 mV.
Synthesis and Structure of New gem-Diols with 1,2,3-Triazole Fragment
摘要
α-(1,2,3-Triazole)-substituted acetals were obtained using the click procedure. Under acid hydrolysis conditions these acetals were converted into earlier unknown stable gem-diols containing a triazole ring.
Three-Component One-Pot Synthesis of New 2,5,6,7- and 2,5,8,10-Substituted Pyrimido[4,5-b]quinoline-4,6-diones and -2,4,6-Triones
摘要
A series of new pyrimido[4,5-b]quinoline derivatives was synthesized by three-component cyclocondensation of 2-R1-6-aminopyrimidine-4-ones, 5,5-dimethylcyclohexane-1,3-dione (dimedone), and aromatic or heterocyclic aldehydes in a water medium in the presence of triethylbenzylammonium chloride. The replacement of the primary amino group in the position 6 of the key 6-aminopyrimidin-4-one with the secondary amino group led to the formation of 10-substituted analogs of pyrimido[4,5-b]quinolines which are of interest for biological screening.
Synthesis of 2N-Alkyl-substituted 5-Amino-3-imino-1,2,4-thiadiazolines
摘要
Conditions for an efficient and a readily reproducible synthesis of a series of 2N-Alkyl-substituted 5-amino-3-imino-1,2,4-thiadiazolines by the direct alkylation of 3,5-diamino-1,2,4-thiadiazole with alkyl bromides in fairly high yields (up to 76%).
Synthesis of Isomeric (Methoxycarbonyl)furoyl Phosphonates and Their Reaction with Ethoxycarbonylmethylenetriphenylphosphorane
摘要
Addition of diethyl- and diisopropyl hydrogen phosphites to isomeric (methoxycarbonyl)-2- and 3-furaldehydes in the presence of sodium ethylate or potassium fluoride led to the formation of the corresponding hydroxyphosphonates. When treated with DMSO-acetic anhydride mixture at room temperature these compounds were selectively oxidized to the corresponding furoyl phosphonates. 2-Methoxycarbonyl-3- furoyl phosphonate was synthesized via the Arbuzov reaction from 2-methoxycarbonyl-3-furoyl chloride and triethyl phosphite. The obtained isomeric (methoxycarbonyl)furoylphosphonates regardless of the structure of heterocyclic fragment react with ethoxycarbonylmethylenetriphenylphosphorane to give ethyl 3-(furyl)-3-(dialkoxyphosphoryl) acrylates with trans-location of phosphoryl and carbonyl groups against the double bond.
Dimerization of Pheophorbide а with Activated Carboxylic Group in the Reaction with Ethylenediamine
摘要
The interaction of ethylenediamine with pheophorbide a, carboxylic group of the latter being activated with di-tert-butyl dicarbonate, has been studied. Acylation of two amino groups of ethylenediamine with activated pheophorbide a and the formation of phorbine-phorbine dimer with the macrocycles bound in the dimer via amide bonding with ethylenediamine bridge have been demonstrated. It has also be found that the phorbine-phorbine dimer is formed even in large excess of ethylenediamine with respect to pheophorbide a.
Macrocyclic Compounds with 2-Phenylindene Fragments. Synthesis and Properties
摘要
By the reaction of 1-imino-2-phenyl-1H-indene-3-amine with 1,4-naphthylenediamine and 1,4-diaminonaphthalenesulfonic acid linear products of 1 : 2 and 2 : 1 condensation as well as macrocyclic compounds were synthesized.
Molecular Complexes of μ-Carbidodimeric Iron(IV) Tetra-4-tert-butylphthalocyaninate with Nitrogenous Bases
摘要
The reaction of μ-carbidodimeric iron(IV) tetra-4-tert-butylphthalocyaninate with nitrogenous bases (imidazole and its derivatives, pyridine, diethylamine), which involves formation of donor‒acceptor complexes with a preserved dimeric structure, was studied by spectral methods. The composition of such molecular complexes and their comparative stability were determined. The coordination power of μ- carbidodimeric iron(IV) tetra-4-tert-butylphthalocyaninate was found to depend on the nature of the nitrogenous base and macrocycle. Quantum-chemical modeling of the coordination reaction was performed. The energetic and geometric characteristics of the donor‒acceptor complexes were obtained. The composition of the reaction products was shown to be affected of the degree of deformation of the macrocycle.
Synthesis of Magnesium Octa-4,5-phenoxyphthalocyanine and Sulfo- and Alkylsulfamoyl Derivatives on Its Basis
摘要
By the reaction of nucleophilic substitution of bromine atom and the nitro group of 4-bromo-5- nitrophthalonitrile 4,5-diphenoxyphthalonitrile was obtained and on its basis new derivatives of octa-4,5- phenoxyphthalocyanine were synthesized soluble in water- and organic solvents. The spectral properties and thermodestruction of the products were investigated.
Influence of the Coordination Surrounding of Co(II)- and Co(III)-Tetraphenylporphyrins on Their Destruction Processes in the Presence of Organic Peroxides
摘要
The interaction of Co(II)- and Co(III)-5,10,15,20-tetraphenylporphyrins with tert-butylhydroxyperoxide and di-tert-butylhydroxyperoxide in benzene at 298 K were studied by spectrophotometry and 1H NMR spectroscopy. Kinetic parameters of the destruction reactions of porphyrin macrocycle depending on the nature of peroxide the valence of cobalt cation, and the presence and nature of axial ligands were calculated. Products of consecutive decomposition of tetrapyrrole macrocycle to monopyrroles were determined by mass spectrometry.
Synthesis and Properties of Metal Phthalocyanines Containing Azo Chromophores
摘要
4-(R-Diazenyl)phthalonitriles have been obtained from 4-aminophthalonitrile via diazotization and azo coupling. Based on these phthalonitriles, the corresponding metal phthalocyanines have been synthesized using the nitrile method. Spectral and other physicochemical properties of the prepared compounds have been studied.
Effect of Structure and Medium on Photostability of Halogenated Boron(III), Zinc(II), and Cadmium(II) Dipyrromethenates
摘要
Photostability of B(III), Zn(II), Cd(II) complexes with monoiodo- and dibromosubstituted dipyrromethenes [BF2L] and [ML2] in benzene and cyclohexane solutions is studied. It is found that the mechanism of destruction of the dyes under UV radiation is based on participation of singlet oxygen generated by the excited triplet state of the dye. Singlet oxygen enters the oxidation reactions of the pigment molecules leading to accumulation of colorless products based on di-, monopyrrol, and smaller fragments. Initial stages of the process include the reactions of dehalogenation of the dye molecules and are accompanied by enhancement of the fluorescence of the formed alkyl-substituted dipyrromethenates. The photostability of boron complexes [BF2L] is up to 32 times higher as compared to that of [ZnL2] and [CdL2]. The replacement of 4-iododipyrromethene ligands in [BF2L] and [ML2] by 5,5'-or 4,4'-dibromo-substituted ligands increases photostability of the dyes. The stability of the dyes against UV irradiation substantially decreases in benzene with respect to cyclohexane due to enhancement of polarization of the chromophore systems of dipyrromethene ligands because of their solvation with benzene (π–π-stacking).
Synthesis of Platinum(II) Phoshine Isocyanide Complexes and Study of Their Stability in Isomerization and Ligand Disproportionation Reactions
摘要
Phosphine isocyanide complexes cis-[PtCl2(CNMes)(P)] with mesitylisocyanide and phoshine ligands were synthesized in yields of 92‒98%. The products were characterized by mass spectrometry, IR and 1H NMR, COSY, NOESY, HSQC, and HMBC spectroscopy, and X-ray diffraction analysis. The solid-state and solution structures of the complexes and their stability in isomerization and ligand disproportionation reactions were studied.
Tetrakis[(1,1'-biphenyl-4-yl)oxy]phthalocyanine and Its Zinc and Erbium Complexes
摘要
4-[(1,1'-Biphenyl-4-yl)oxy]phthalonitrile was synthesized by nucleophilic substitution of the nitro group in 4-nitrophthalonitrile, and its reactions with zinc and erbium salts afforded zinc tetrakis[(1,1'-biphenyl- 4-yl)oxy]phthalocyanine and single- and double-decker erbium complexes. Spectral characteristics of the synthesized compounds were studied.
Modification of Polymyxin B1 by Water-Soluble Functional Copolymers of Vinyl Alcohol
摘要
The condensation of the peptide antibiotic Polymyxin В1 with the vinyl alcohol copolymers containing aldehyde groups was studied. The structure and composition of the resulting conjugates were determined. The polymer derivatives of the antibiotic were shown to preserve their antimicrobial activity.
Structure of the Condensation Products of D-Lactose and D-Maltose with SH-Contaning Carboxylic Acid Hydrazides
摘要
The structure of the condensation products of D-lactose and D-maltose with sulfanylacetic, 3-sulfanylpropanoic, and 2-sulfanylbenzoic acid hydrazides has been studied 1H and 13C NMR spectroscopy. The condensation products obtained from the disaccharides and sulfanylacetohydrazide and 3-sulfanylpropanehydrazide have pyranose structure in the crystalline state, whereas those derived from 2-sulfanylbenzohydrazide have cyclic 1,3,4-benzothiadiazepine structure in crystal. All condensation products in solutions in most solvents (D2O, DMF-d7, DMSO-d6) exist as equilibrium mixtures of linear and cyclic pyranose and 1,3,4-benzothiadiazepine tautomers.
Synthesis of Gold Glyconanoparticles Based on the Condensation Products of D-Lactose and D-Maltose with SH-Containing Hydrazides
摘要
A procedure has been developed for the synthesis of gold glyconanoparticles with an average particle size of 16–24 nm and low polydispersity index on the basis of accessible D-maltose and D-maltose 2-sulfanylacetyl-, 3-sulfanylpropanoyl-, and 2-sulfanylbenzoylhydrazones.
Synthesis and Spectral-Luminescent Properties of Zinc Sulfide Nanoparticles in a Perfluorosulfonic Membrane
摘要
Zinc sulfide nanoparticles were synthesized in pores of a perfluorosulfonic membrane by ion exchange fixation of Zn2+ cations followed by the processing with gaseous hydrogen sulfide. Resulting ZnS particles are X-ray amorphous, have a low density, and are clearly expressed in absorption and luminescence spectra. Features of the nanoparticles optical properties were considered in light of electrons photoexcitation on antibonding orbitals (Zn–S)*.
Determination of Optimal Conditions for Electoless Synthesis of Copper Nanotubes in the Polymer Matrix
摘要
The effects of temperature and the components ratio on the formation of copper nanotubes in tracketched membrane matrix and crystalline structure of the products have been studied. The changes in the structure and morphology properties of the composite membranes surface and copper nanotubes have been studied by means of X-ray diffraction and scanning electron microscopy.
Synthesis and Anticancer Activity of 1,2,4-Oxadiazole Fused Benzofuran Derivatives
摘要
Ten 1,2,4-oxadiazole fused benzofuran derivatives 11a–11j are synthesized, and their structures are confirmed by 1H and 13C NMR, and mass spectral data. Their anticancer activity against four human cancer cell lines, A549 (Lung), MCF7 (Breast), A375 (Melanoma), and HT-29 (Colon), by the MTT method is tested. The compounds 11b–11d, 11g, 11h, and 11j demonstrate more potent activity than the positive control.
Ferric Chloride-catalyzed Synthesis of 2-Oxo-1,2-dihydro-1,8-naphthyridine-3-carboxylate Derivatives and Their Biological Evaluation
摘要
A new methodology has been developed for the synthesis of novel 2-oxo-1,2-dihydro-1,8-naphthyridine-3-carboxylates from 2-aminonicotinaldehyde, Meldrum’s acid, and the corresponding alcohols in the presence of anhydrous iron(III) chloride as a cheap and readily available catalyst. The structure of the synthesized compounds was established by IR, 1H NMR, and mass spectral data and elemental analyses. All the synthesized compounds were evaluated for their in vitro antibacterial and antifungal activity, and the activity of some derivatives was comparable with the activity of Ciprofloxacin and Nystatin used as reference drugs.
Efficient Synthesis and Reactions of New Functionally Substituted Pyrido[2,3-d]pyrimidine Candidates
摘要
Pyrido[2,3-d]pyrimidine derivatives were synthesized by the reaction of 2-hydrazinopyrido[2,3-d]-pyrimidin-4(3H)-one with different aryl aldehydes and active methylene compounds. Their structures were characterized by spectroscopic methods.
A Simple “Green” Synthesis of Novel Bis(3-aryl-1,8-naphthyridin-2-yl)sulfanes and 2-(Methylthio)-3-aryl-1,8-naphthyridines under Microwave Irradiation and Conventional Conditions
摘要
An eco-friendly and highly efficient synthesis of substituted bis(3-aryl-1,8-naphthyridin-2-yl)-sulfanes and 2-(methylthio)-3-aryl-1,8-naphthyridines under microwave and conventional conditions. The products are obtained with high yields and purity within short reaction time. The synthesized derivatives are screened for anti-microbial activity against bacteria and fungi. Molecular docking of the synthesized compounds with DNA Gyrase is studied.
Microwave Assisted, Solvent-Free, “Green” Synthesis of Novel Indole Analogs as Potent Antitubercular and Antimicrobial Agents and Their Molecular Docking Studies
摘要
A rapid, efficient and environmentally benign synthesis of novel indole analogs bearing thiazolidinone attached to substituted thiazolyl coumarin scaffolds are synthesized. Conventional and microwave-assisted (MW) approaches are studied. Structures of the products are confirmed by FT-IR, NMR (1H and 13C) and Mass spectra. The in vitro antitubercular and antimicrobial activities are evaluated. Several screened compounds demonstrate promising anti-TB and antimicrobial properties. The structure activity relationship (SAR) study reveal that the compounds containing halogens are most potent. Docking of the potent compounds inside the active site of a target enzyme mycobacterial enoyl reductase (InhA)(PDB code 4TZK) is performed.
Novel Pyran and Polyhydroquinoline Derivatives: Inhibiting Human Osteosarcoma Activity
摘要
A series of pyran 1–6 and polyhydroquinoline derivatives 7–9 are synthesized targeting anticancer agents for clinical trials. Their structures are characterized by IR, 1H NMR, and HRMS spectra, and single crystal X-ray crystallography. Their anticancer activity against four human osteosarcoma cells (Saos-2, MG-63, 143B, and U2-OS) is evaluated in vitro using the MTT assay. The compounds 7–9 demonstrate high anticancer activity against the four cancer cells.
p-Aromatic Isothiocyanates: Synthesis and Anti Plant Pathogen Activity
摘要
In this study, a series of p-aromatic isothiocyanates are prepared by reacting p-aromatic amines with carbon disulphide and further treating with molecular iodine to yield corresponding isothiocyanate derivatives. The structures of newly synthesized compounds are confirmed by IR, NMR, and MS data. Activity of the products against plant pathogenic fungi and bacteria is tested and the structure-activity relationship is approached. p-Nitrophenyl isothiocyanate most efficiently inhibits Rhizoctonia solani and Erwinia carotovora. The order of seven aromatic isothiocyanates antifungicidal activity is following: p-nitrophenyl > p-methoxyphenyl > p-chlorophenyl > p-methylphenyl > p-ethylphenyl > phenyl > p-fluorophenyl. For antibacterial activity, the order was p-nitrophenyl > p-chlorophenyl > p-methylphenyl > p-ethylphenyl > p-fluorophenyl > phenyl > p-methoxyphenyl. The present study indicates that some of the compounds exhibit promising antimicrobial activity and can be used as an alternative to the traditional synthetic fungicides for controlling R. solani and E. carotovora.
Synthesis and Characterization of New Nano-Sized Selenium Compounds to Further Use as Antioxidants Drugs
摘要
Here we report the studies on selenium coordination compounds, in particular selenium nanoparticles (Nps), that can be used in pharmacology. The Se Nps were synthesized by three pathways and characterized by FT-IR, XRD, SEM, TEM, and EDX analyses. Сomplexes of Se(0) with alanine, tyrosine, serine, aspartic acid, histidine, and glycine as ligands, are synthesized in a 1: 2 molar ratio. IR spectra of solid complexes indicate that selenium metal is coordinated with the amino and carboxylate groups. The complexes are square planar structures with two amino acids bidentate ligands occupying the corners. Binary complexes of Se Nps with Ala, Tyr, Ser, Asp, His, and Gly react readily with vitamine B3 (nia) affording mixed ligand complexes of the types [Se(AA)2(nia)2], where AA indicates the above aminoacids. These complexes are determined to have a 1 : 2 : 2 (Se : AA : nia) stoichiometry with coordination number 6. The structures of products are studied by FT-IR, Raman and UV-Vis spectra, XRD, SEM/TEM, and TG/DTG. Conductance of the complexes in DMSO indicates their non-electrolytic nature. The complexes demonstrate antioxidant activity with potent scavenging property.
Heterometallic Carboxylate Complexes as Precursors for Mixed Oxides: I. s–d Carboxylates
摘要
The current status of research into the thermal behavior of heterometallic s–d carboxylates that are suitable candidates for single-source precursors of mixed oxides was considered. Emphasis was placed on the thermal stability and conditions of conversion of complexes to mixed oxides The influence of the composition and nature of the precursor on the composition and properties of the resulting mixed oxides was demonstrated.
Heterometallic Carboxylate Complexes as Precursors for Mixed Oxides: II. d–d Carboxylates
摘要
The current status of research into the thermal behavior of heterometallic d–d carboxylates that are suitable candidates for single-source precursors of mixed oxides was considered. Emphasis was placed on the thermal stability and conditions of conversion of complexes to mixed oxides. The influence of the composition and nature of the precursor on the composition and properties of the resulting mixed oxides was demonstrated.
Heterometallic Carboxylate Complexes as Precursors for Mixed Oxides: III. 3d–4f Carboxylates
摘要
The current status of research into the thermal behavior of heterometallic 3d–4f carboxylates that are suitable candidates for single-source precursors of mixed oxides was considered. Emphasis was placed on the thermal stability and conditions of conversion of complexes to mixed oxides. The influence of the composition and nature of the precursor on the composition and properties of the resulting mixed oxides was demonstrated.
Photoelectrochemical Properties of Oxide Systems Formed by Plasma Electrolytic Oxidation
摘要
This paper describes the photoelectrochemical properties of titanium oxide formed by plasma electrolytic oxidation. The possibility of correlation between the photoactivity of the formed systems and their impedance characteristics was investigated. Equivalent circuitries which allow explanation of the character of the impedance spectra were constructed and interpreted. The role of heat treatment and surface modification with platinum on the photoelectrochemical and electrochemical characteristics of the formed systems was demonstrated.
Complex Formation of Cyclodextrins with Sulfasalazine in Buffer Solutions
摘要
Complex formation of α-, β-, and γ-cyclodextrins with sulfasalazine in biologically relevant buffer solutions (pH 1.2 and 7.4) was studied. Formation of inclusion complexes of 1 : 1 stoichiometry between the drug and cyclodextrins was revealed. The ionization state of sulfasalazine more strongly affects the complex formation than does the structure of cyclodextrins. Compared with a neutral molecule, sulfasalazine anionic species forms with cyclodextrins more stable complexes, which are essentially stabilized by possible surface interactions.
Electrochemical Oxidation of Hydrolytic Lignins in Fluoride-Containing Aqueous Electrolytes
摘要
Electrochemical oxidation of hydrolytic lignins from different natural sources in fluoridecontaining alkaline and acidic electrolytes was studied. An electrochemical method for the synthesis of oxidized lignins in hydrofluoric acid solutions was proposed. The products of modification of the lignins were examined using functional analysis, 19F NMR, IR, and UV spectroscopy, and gel-chromatographic analysis.
Nomenclature and Terminology Problems of Modern Coordination Chemistry
摘要
A brief analysis of the existing definitions of the term “coordination compound” has been carried out and a definition that takes into account the features of this class of chemical compounds has been proposed. The existing systematic IUPAC nomenclature of coordination compounds and its possible use for constructing the names of metal complexes of different types, as well as difficulties associated with this process have been considered.
Letters to the Editor
Copper-catalyzed 1,3-Dipolar Cycloaddition of Substituted N-Propargylindoles and Terminal Diazidoalkanes
摘要
Copper-catalyzed alkyne-azide 1,3-dipolar cycloaddition was studied of substituted N-propargylindoles and diazidoalkanes leading to symmetric conjugates of substituted indoles with bistriazole-containing spacer.
Synthesis of 1-[2-(1H-Indol-3-yl)ethyl]-4-acetyl-3-hydroxy-5-phenyl-1H-pyrrol-2(5H)-ones
摘要
1-[2-(1H-indol-3-yl)ethyl]-4-acetyl-3-hydroxy-5-phenyl-1H-pyrrole-2(5H)-ones were synthesized by the short heating of a mixture of tryptamine, aromatic aldehyde, and methyl acetylpyruvate followed by stirring at room temperature for one day.
Synthesis of 2,6-Diisopropyltetrahydro-2H-4-pyranone and Some Its Substituted Amino Derivatives
摘要
Cyclization of 2,8-dimethylnona-3,6-diene-5-one furnished 2,6-diisopropyltetrahydro-2H-4-pyranone. The condensation of the latter with alkylaryl and aliphatic amines afforded azomethines, which were converted into the corresponding amines by reduction with sodium borohydride.
Erratum
Erratum to: “Sol-Gel Synthesis and Properties of Y1–xBaxFeO3 Nanocrystals”
摘要
The fourth author of the article should read A. T. Nguyen.
Affilation of A.T. Nguyen should read Ho Chi Minh City University of Education, Ho Chi Minh City, Viet Nam.