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Том 87, № 7 (2017)
- Год: 2017
- Статей: 35
- URL: https://journals.rcsi.science/1070-3632/issue/view/13659
Article
Decomposition of pentaammineaquacobalt(III) perchlorate under laser radiation action
Аннотация
Photolytic decomposition of the complex [Co(NH3)5(H2O)](ClO4)3 under the action of a laser with a wavelength of 355 nm, which is resonant in energy to the energy of the (1A1g → 1T2g) d–d transition, was studied. Decomposition of the complex is accompanied by a release of ammonia with its subsequent oxidation to nitrogen oxides and by partial cobalt reduction with the formation of the mixed cobalt(II, III) oxide Co3O4.
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Hexahydropyrimidin-2-one in nanotubes: Structural changes and conformational preferences
Аннотация
Investigation of conformational transformations of hexahydropyrimidin-2-one in the cavity of nanotubes with chirality indices (5,5) and (8,0) using DFT-method PBE/3ζ has shown that the encapsulated heterocyclic system has shortened С–N bonds, elongated С=О bond, bears an electric charge and is characterized by an increased potential barrier of interconversion as compared to the free molecule. In the case of (4,4) nanotube, a virtual reaction of the molecule in the cavity with the carbon atoms of the nanotube occurs.
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Thermal reduction of graphite oxide derivatives for preparation of supports for platinum hydrogenation catalysts
Аннотация
Thermal reduction of graphite oxide and its derivatives under argon atmosphere has been studied by means of thermogravimetric analysis. Carbon materials prepared via thermal reduction of graphite oxide derivatives in argon at 900°С during 3 h have been used for deposition of platinum from H2PtCl6 solutions. Pt particles supported on the support catalyze liquid-phase hydrogenation of nitrobenzene and dec-1-ene under atmospheric pressure of H2. Thermal reduction of the supports based on graphite oxide results in the formation of the structural defects significantly enhancing the catalytic activity.
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Emitters of chemiluminescence occurring during autoxidation of substituted hydroquinones in water
Аннотация
A mathematical processing method for determination of spectral parameters of chemiluminescence emitters during the autoxidation of phenolic compounds in aqueous-alkaline media has been developed. The presence of a single luminescence emitter (the corresponding p-benzoquinone in the triplet state) has been demonstrated in the hydroquinone–oxygen–water system. The emitters spectra have been obtained.
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Hydrolysis of radicals and molecules of ethers
Аннотация
Radiolysis of aqueous solutions of diisopropyl and methyl tert-butyl ethers under γ-irradiation has been studied. The effect of pH on the products yield has been investigated. It has been shown that the rate constants of ether radicals hydrolysis are ~109 times higher than these of ether molecules in acidic as well as basic medium.
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Kinetics of the reaction of N,N-dimethylaniline with 1-bromoalk-2-ynes
Аннотация
Quaternization of N,N-dimethylaniline with propargyl bromide, 1-bromobut-2-yne, and 1-bromooct-2-yne were studied. It was shown that, with the lengthening chain of the substituent at the triple bond, the quaternization rate tends to increase.
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Reaction of methyl 2,4-dioxobutanoates with tetracyanoethylene
Аннотация
Reaction of methyl 2,4-dioxobutanoates with tetracyanoethylene yielded methyl 3-acyl-4-cyano-5-(dicyanomethylene)-2-hydroxy-2,5-dihydro-1H-pyrrole-2-carboxylates. X-Ray diffraction data showed that 3-acyl-4-cyano-5-(dicyanomethylene)-2-hydroxy-2,5-dihydro-1H-pyrrole-2-carboxylic acid methyl esters can form supramolecular structures with one-dimensional channels which make possible inclusion of large organic and bioorganic molecules.
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Reaction of 1,3,4,6-tetraoxo compounds with arylamines and cycloalkylketones
Аннотация
Reactions of methyl 3,4,6-trioxoheptanoate and 1,6-dimethyl-1,3,4,6-tetraoxohexane with aromatic amines (aniline, p-toluidine) and cycloalkylketones (cyclopentanone, cyclohexane, camphor) were studied. The structure of the resulting compounds was studied by IR and NMR spectrosocopy, mass spectrometry, and X-ray diffraction analysis.
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Features of reactions of (E)-[(2-aroyl)ethenyl]triphenylphosphonium bromides with binucleophiles
Аннотация
Reactions of (E)-[(2-aroyl)ethenyl]triphenylphosphonium bromides with hydroxylamine hydrochloride resulted in the formation of oximes undergoing α-phenyl migration when reacted with aqueous alkali. Reaction of these salts with hydrazine hydrochloride and o-phenylenediamine yielded [(2-aroyl)ethyl]triphenyl-phosphonium salts and phosphorus-substituted quinoxalines, respectively.
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Synthesis and transformations of 6-acetyl-1,2,3,4-tetrahydro-2,2,4,7-tetramethylquinoline
Аннотация
By acylation of 1,2,3,4-tetrahydro-2,2,4,7-tetramethylquinoline under the conditions of the Friedel–Crafts reaction its 6-acetyl derivative was obtained, which opens the access to new linearly designed 6-(pyrimidin-4-yl)-1,2,3,4-tetrahydro-2,2,4,7-tetramethylquinolines.
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Derivatives of furyl(diethoxyphosphoryl)acetic aldehyde in Wittig reaction
Аннотация
Reactions of furyl(diethoxyphosphoryl)acetic aldehyde containing ester or cyano group in the furan ring with ethoxycarbonylmethylenetriphenylphosphorane has been shown to afford alkyl E-4-(furyl)-4-(diethoxyphosphoryl)but-3(2)-enoates. When treated with potassium tert-butoxide the mixture of alkyl E-4-(3-ethoxycarbonylfur-2-yl)-4-(diethoxyphosphoryl)but-2-enoate and -but-3-enoate gives a potassium salt of CHacid. Its acidifying results in a mixture of starting compounds with a larger amount of -but-3-enoate. Under analogous conditions the mixture of alkyl E-4-(2-ethoxycarbonylfur-3-yl)-4-(diethoxyphosphoryl)but-2-enoate and -but-3-enoate undergoes cyclization to a phosphorylated derivative of alkyl 7-hydroxybenzofuran-6-carboxylate. The cyclization of the mixture of alkyl E-4-(4-ethoxycarbonylfur-3-yl)-4-(diethoxyphosphoryl)but-2-enoate and -but-3-enoate gives analogous derivative of isobenzofuran.
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Synthesis of trivalent phosphorus derivatives by light-induced dibromophosphination of akenes
Аннотация
Light-induced dibromophosphination of alkenes was studied. Dehydrobromination of the synthesized bromoalkylphosphonous dibromides gave the corresponding dibromophosphinoalkenes which were converted into alkenylphosphonous acids and their cyclic esters, benzo[1,3,2]dioxaphospholes.
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(4-Methoxyphenyl)amine and its derivatives in the synthesis of O-silylurethanes, ureas, and formamides
Аннотация
Reactions of (4-methoxyphenyl)amine and its trimethylsilyl derivative with organosilicon isocyanates and phenylisocyanate have been studied. (4-Methoxyphenyl)formamide was first synthesized by the reaction of (4-methoxyphenyl)amine with ethyl formate. The structure of trimethylsilyl(4-methoxyphenyl)-carbamate and N-(4-methoxyphenyl)formamide was determined by X-ray diffraction (XRD) analysis.
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Light-induced formation of nitroxyl radicals by organic Bi(V) compounds in the presence of 2-methyl-2-nitrosopropane and C-phenyl-N-tert-butylnitrone
Аннотация
The organic bismuth compounds Ph3Bi(O2CCH=CHCH3)2 and Ph3Bi(O2CEt)2 decompose under scattered light in the presence of spin traps (2-methyl-2-nitrosopropane and C-phenyl-N-tert-butylnitrone) in organic solvents (acetonitrile, benzene, toluene) to form adducts of phenyl radicals with the traps.
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Effect of halogenation features on the stability of Zinc(II) complexes with monoiodo- and dibromodipyrromethenes
Аннотация
The complex formation of zinc(II) acetate with monoiodo- and dibromo-substituted dipyrromethenes in DMF at 298.15 K were studied by means of spectrophotometric titration. It was found that the process involves consecutive formation of heteroligand [ZnLOAc] and homoligand [ZnL2] complexes. The thermodynamic stability of halogenated zinc(II) dipyrrolylmethenates [ZnL2] was studied.
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Thermal stability of chlorophyll a derivatives containing hydrophilic groups
Аннотация
Trends in thermal stability of aromatic macroheterocycles based of pheophorbide a and chlorin e6 containing hydrophilic groups have been revealed by means of thermogravimetric analysis at 298–1223 K under inert atmosphere. Methylpheophorbide a and 13(1)-N-methylamide of chlorin e6 are the most stable, the decomposition onset temperature being to 351 and 333°С. Their functional substitution leads to the reduction in thermal stability. Depending on the macrocycle structure the decrease in to can reach 20–200°С.
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Nucleophilic substitution in 4-bromo-5-nitrophthalodinitrile: XV. Synthesis of bis-4,5-(phenylsulfanyl)phthalonitrile, octakis-4,5-(phenylsulfanyl)phthalocyanines, and their sulfo and alkylsulfamoyl derivatives
Аннотация
Novel water- and organic-soluble derivatives of octakis-4,5-(sulfanylphenyl)phthalocyanine and its magnesium and aluminum complexes were synthesized starting from 4,5-bis(phenylsulfanyl)phthalonitrile obtained by nucleophilic substitution of the bromine and nitro group in 4-bromo-5-nitrophthalonitrile. Spectral and luminescence characteristics of the newly synthesized compounds were studied.
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Coordination of zinc tetraphenylporphyrin with pyridine derivatives in chloroform solution and in the solid phase
Аннотация
Coordination of zinc tetraphenylporphyrin with 2-,3-, and 4-halopyridines, pyridin-2-amine, and pyrimidin-2-amine in chloroform has been studied by spectrophotometry. Protonation and complexation of halopyridines and haloanilines with zinc tetraphenylporphyrin are discussed. According to the X-ray diffraction data, enhanced stability of the 2: 2 zinc tetraphenylporphyrin complex with pyrimidin-2-amine in the solid phase and in chloroform solution is likely to be determined by hydrogen bonding between the two ligand molecules involving nitrogen atoms in the pyrimidine ring and amino group.
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β-Bromo-substituted palladium(II) tetraphenylporphyrins. Synthesis and spectral properties
Аннотация
Bromination of (5,10,15,20-tetraphenylporphyrinato)palladium(II) and [5,10,15,20-tetrakis(4-methoxyphenyl)porphyrinato]palladium(II) with N-bromosuccinimide in chloroform–dimethylformamide and chloroform afforded mono-, tetra-, and octabromo derivatives substituted at the pyrrole rings. The products were identified by electronic absorption, 1H NMR, and mass spectra and elemental analyses.
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Oxidized nanodiamond batches as filler for composite films based on polyvinyl alcohol
Аннотация
The effect of the method of nanodiamonds oxidation (with acids or with air oxygen) on the amount of oxygen-containing functional groups on the particles surface and stability of the aqueous dispersions has been studied. Composite polymer films based on polyvinyl alcohol and nanodiamonds batches have been prepared; the effect of the oxidation procedure on the film structure, elasticity modulus, and tensile strength has been elucidated. The most stable aqueous dispersions (containing the smallest particles) as well as the most uniform and strong composite films (exhibiting the highest elasticity modulus and tensile strength) have been obtained using the ShA-A nanodiamonds batch (Sinta, Belarus) oxidized with air oxygen.
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Synthesis of some substituted 5H-furo[3,2-g]chromene and benzofuran sulfonate derivatives as potent anti-HIV agents
Аннотация
Synthesized visnagin-9-sulfonyl esters underwent cleavage of their pyran ring upon treatment by hydroxylamine hydrochloride, hydrazine hydrate and primary amines. Reaction of visnagin-9-sulfonyl chloride 1 with alcohols or phenol gave the corresponding sulfonate derivatives 2, that were treated with hydroxylamine hydrochloride, anilines or hydrazine derivatives to give the corresponding compounds 3–5, respectively. The obtained products demonstrated potent anti-HIV activity.
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Synthesis of some substituted furo[3,2-g]chromeno[2,3-c]pyrazole and pyrazoline derivatives from 5-hydroxybergapten and 5-hydroxyisopimpinellin as EGFR and VEGFR-2 kinase inhibitors
Аннотация
A series of substituted 7H-furo[3,2-g]chromen-7-one and furo[3,2-g]chromeno[2,3-c]pyrazole derivatives (2–9) were synthesized by using 5-hydroxy-4-methoxy-7H-furo[3,2-g]chromen-7-one (5-hydroxybergapten) and 5-hydroxy-4,9-dimethoxy-7H-furo[3,2-g]chromen-7-one (5-hydroxyisopimpinellin) (1) as starting materials. Compound 1 reacted with amino acid esters to give the corresponding 5-N-amino acid derivatives 2 and 3, respectively. Bromination of 1 gave the corresponding 6-bromo analouges 4, that were treated with amino acids esters to give the corresponding 6-N-amino acids analogues 5. Treatment of the later with hydrazine hydrate led to cleavage of the pyran ring and gave the corresponding pyrazoline benzofuran derivatives 6. Formylation of 1 gave aldehyde derivative 7, which was condensed with amino acid to give the corresponding 5-N-amino-6-formyl derivatives 8. Cyclization of compounds 8 with hydrazine hydrate gave the corresponding pyrazoline derivatives 9. All synthesized compounds were tested as EGFR and VEGFR-2 kinase inhibitors.
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Synthesis of new macrocyclic complexes of transition metals: Structural characterization and biological activity
Аннотация
Condensation reaction between benzildihydrazone and pyridine 2,3-dicarboxylic acid, pyridine 3,4-dicarboxylic acid or pyridine 2,4-dicarboxylic acid in methanol led to novel Schiff base macrocyclic ligands L1, L2, and L3 respectively. Metal complexes of the type [MLCl2], [M = Co(II), Ni(II)], were synthesized by the reaction of a free macrocyclic ligand (L) with the corresponding metal salts in a 1 : 1 molar ratio. The complexes were characterized on the basis of analytical data, molar conductivity and magnetic susceptibility measurements, IR, 1H, and 13C NMR, and electronic spectral data. Those demonstrated that all the complexes had octahedral arrangement around the metal ions. The ligand and its complexes were screened for their antibacterial, antifungal and DNA cleavage activities. The studies demonstrate that the complexes possessed antimicrobial and DNA cleavage activities.
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Synthesis and characterization of some novel 7-(aryl)-3-phenyl-6-(1H-tetrazol-5-yl)-5H-thiazolo[3,2-a]pyrimidin-5-one derivatives
Аннотация
A series of novel tetrazole derivatives containing fused thiazolo[3,2-a]pyrimidines were synthesized in a one-pot three-component reaction of 7-(aryl)-5-oxo-3-phenyl-5H-thiazolo[3,2-a]pyrimidine-6-carbonitriles with sodium azide and ammonium chloride.
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Synthesis and some reactions of novel (4Z)-4-{[1-(3-chlorophenyl)-3-(4-methoxyphenyl)-1H-pyrazol-4-yl]methylene}-2-hydrazinyl-1-phenyl-1H-imidazol-5(4H)-ones
Аннотация
Some novel (4Z)-2-[(E)-2-arylidenehydrazinyl]-4-{[1-(3-chlorophenyl)-3-(4-methoxyphenyl)-1H-pyrazol-4-yl]methylene}-1-phenyl-1H-imidazol-5(4H)-ones have been synthesized in a one-pot threecomponent cyclocondensation of pyrazole-4-carbaldehyde derivative with glycine and different isothiocyanate derivatives. The structures of the newly synthesized compounds were characterized by analytical and spectral data.
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Letters to the Editor
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One-pot multicomponent synthesis of 4-(7-cyclohepta-1,3,5-trienyl)aniline derivatives
Аннотация
Reaction of aromatic aldehydes with aniline and tropylium tetrafluoroborate yielded N-arylmethylene-4-(7-cyclohepta-1,3,5-trienyl)anilines, while reaction of aromatic aldehydes with aniline, tropylium tetrafluoroborate, and sodium tetrahydroborate afforded N-arylmethyl-4-(7-cyclohepta-1,3,5-trienyl)anilines. Two most promising compounds, N-2-hydroxyphenylmethylene-4′-(7-cyclohepta-1,3,5-trienyl)aniline and N-2-hydroxyphenylmethyl-4′-(7-cyclohepta-1,3,5-trienyl)aniline, were tested for acute toxicity (LD50) and their low toxicity was revealed.
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Synthesis and some transformations of 2-(4-isopropyl-2-methyl-2-ethyltetrahydro-2H-pyran-4-yl)ethanamine
Аннотация
Condensation of 2-(4-isopropyl-2-methyl-2-ethyltetrahydro-2H-pyran-4-yl)ethanamine with aromatic aldehydes and ketones and subsequent reduction of the azomethines formed gave secondary amines of the tetrahydropyran series. Reaction of the latter with acetic acid and propionic acid chlorides provided the corresponding amides.
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Fe-catalyzed synthesis of methyl-(2E,4Z)-deca-2,4-dienoate, a component of sex pheromones of Pityogenes chalcographus and Acanthoscelides obtectus
Аннотация
Stereoselective synthesis of methyl-(2E,4Z)-deca-2,4-dienoate, a component of sex pheromones of Pityogenes chalcographus and Acanthoscelides obtectus, was performed on the basis of Fe-catalyzed cross-coupling of methyl-(2E,4Z)-5-chloropenta-2,4-dienoate with n-pentylmagnesium bromide.
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Reactions of carbazole with dimethyl alkanedisulfonates
Аннотация
Reaction of carbazole with dimethyl alkanedisulfonates in the presence of sodium hydride resulted in the formation of three main products: 2-(9H-carbazol-9-yl)alkylmethanesulfonates, 1,2-di-(9H-carbazol-9-yl)alkanes, and 9-alkenyl-9H-carbazoles.
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1-Phenyl-1-X-1-silacyclohexanes (X = MeO, OH, Me2N)
Аннотация
By the reaction of nucleophilic substitution of chlorine in 1-phenyl-1-chloro-1-silacyclohexane new 1-phenyl-1-X-1-silacyclohexanes (Х = МеО, ОН, Ме2N) have been synthesized and their stability with respect to the formation of (1,1′-phenyl-1,1′-silacyclohex-1-yl)disiloxane have been investigated.
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Erratum
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