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Общее количество найденных документов : 83
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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Al-Ithawi W. K. A., Khasanov A. F., Valieva M. I., Baklykov A. V., Chistyakov K. A., Ladin E. D., Kovalev I. S., Nikonov I. L., Kim G. A., Platonov V. A., Kopchuk D. S., Wang Z., Zyryanov G. V.
Заглавие : (Mechano)synthesis of azomethine- and terpyridine-linked diketopyrrolopyrrole-based polymers
Место публикации : Chimica Techno Acta. - 2023. - Vol. 10, № 2. - С. 202310204
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): diketopyrrolopyrrole-based polymers--pd-catalyzed synthesis--mechanosynthesis
Аннотация: Three efficient synthetic approaches towards new azomethine- and terpyridine-containing 2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (diketopyrrolopyrrole, DPP) based polymers, such as P1 and P2, are reported. The first approach involves the Pd-catalyzed synthesis via two- or three-component Suzuki or Stille cross-coupling reaction in solution. The second approach involves Pd-catalyzed Suzuki cross-coupling reaction under ballmilling conditions. And, finally, the third approach involves Pd-free condensation reaction under ball-milling conditions. The newly obtained polymers exhibited absorbance around 700 nm and emission around 900 nm, and, thus, these polymers are considered to be NIR-fluorophores.
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sharapov A. D., Fatykhov R. F., Khalymbadzha I. A., Santra S., Zyryanov G. V., Chupakhin O. N., Sharutin V. V., Ranu B. C.
Заглавие : Mechanochemical synthesis of coumarins via Pechmann condensation under solvent-free conditions: an easy access to coumarins and annulated pyrano[2,3-f] and [3,2-f]indoles
Место публикации : Green Chemistry. - 2022. - Vol. 24, № 6. - С. 2429-2437
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): a green protocol has been developed for the synthesis of simple coumarins and linear pyrano[2,3-f] and [3,2-f]indoles by the reaction of phenol derivatives with β-ketoesters under ball milling at ambient temperature in the presence of methanesulfonic acid as a mild acid catalyst. the significant advantages of this procedure are high yields, scalability, no use of hazardous acids or solvents, shorter reaction time, ambient temperature, low cost, and straightforward purification without column chromatography. this procedure is associated with high ecoscale metrics and a low e-factor. in contrast to traditional pechmann condensation procedures, the mechanochemical protocol leads to the synthesis of pyranoindoles with excellent regioselectivity and high yields.
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edilova Y. O., Burgart Y. V., Saloutin V. I., Bazhin D. N., Kudyakova Y. S., Kiskin M. A.
Заглавие : Expanding 1,2,4-triketone toolbox for use as fluorinated building blocks in the synthesis of pyrazoles, pyridazinones and β-diketohydrazones
Место публикации : Journal of fluorine chemistry. - 2022. - Vol. 253. - Ст.109932
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Fluorinated lithium β-diketonates bearing a methyl acetal group behave in the condensation reactions with hydrazines as trielectrophilic building blocks for the preparation of pyrazoles, pyridazinones and β-diketohydrazones. For the first time, solvent-induced regioisomeric and heterocyclic ring size-controlled formation was observed for 1,2,4-triketone analogues. Fluoroalkylated acetyl NH-pyrazoles or substituted 5-RF-pyrazoles were obtained from the acid-catalyzed cyclocondensation of lithium β-diketonates with (aryl)hydrazines in ethanol. In methanol solvent acetyl-containing 3-CF3-pyrazoles were isolated because of inverse nucleophilic attack of arylhydrazines. The use of aprotic acetonitrile in the condensation resulted in regioselective trifluorinated pyridazinones and fluorinated β-diketohydrazones formation via initial acetal fragment interaction with N,N-dinucleophile.
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Khonina T. G., Tishin D. S., Larionov L. P., Dobrinskaya M. N., Antropova I. P., Izmozherova N. V., Osipenko A. V., Shadrina E. V., Nikitina E. Yu., Bogdanova E. A., Karabanalov M. S., Evstigneeva N. P., Kokhan M. M., Chupakhin O. N.
Заглавие : Bioactive silicon-iron-containing glycerohydrogel synthesized by the sol-gel method in the presence of chitosan
Место публикации : Russian chemical bulletin. - 2022. - Vol. 71, № 11. - С. 2342-2351
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A novel biologically active nanocomposite glycerohydrogel based on two biocompatible precursors, silicon and iron glycerolates, was synthesized by the sol—gel method in the presence of chitosan (Ch). The composition and structural features of the gel were characterized by advanced analytical methods including transmission electron microscopy, X-ray diffraction, and atomic emission spectroscopy. It was shown that iron(iii) monoglycerolate undergoes partial hydrolysis under the gelation conditions and exists as a separate nanoscale phase along with the hydrolysis products in cells of the 3D Si-containing polymeric gel network. This network is formed as a result of incomplete hydrolysis of silicon glycerolates in excess glycerol followed by homo- and heterofunctional condensation of silanol groups with the formation of Si-O-Si units containing residual glyceroxy groups at the silicon atom. Chitosan forms numerous intermolecular bonds with the 3D gel network, accelerates the process of gelation, makes the gel morphostructure more ordered, and increases the stability of the gel. The Si-Fe-Ch-containing glycerohydrogel is nontoxic and possesses hemostatic and wound-healing activity, being a promising topical medication for medical and veterinary practice.
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Andreikov E. I., Krasikova A. P., Pervova M. G., Kabak A. S.
Заглавие : Investigation of hydrogen transfer from coal tar pitch and petroleum pitches using a-methylstyrene as hydrogen acceptor
Место публикации : Chemistry for sustainable development. - 2022. - Vol. 30, № 5. - С. 446-454
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): a-methylstyrene--coal tar pitch--petroleum pitches
Аннотация: The reaction of hydrogen transfer from coal tar pitch and petroleum pitches to Α-methylstyrene with the formation of cumene was investigated in glass ampoules within the temperature range of 200-360 °C and reaction time of 15-60 min and when passing Α-methylstyrene through a layer of coal tar pitch. It is shown that the formation of non-chromatographable products of Α-methylstyrene condensation with polycyclic aromatic compounds of pitches occurs simultaneously. The dependences of Α-methylstyrene conversion, the selectivity for cumene and condensation products on the temperature and reaction time, the ratio of pitch/Α-methylstyrene are determined. The amount of hydrogen transferred from pitches to Α-methylstyrene was determined, and the results obtained were compared with the literature data on the transfer of hydrogen from pitches obtained using anthracene as a hydrogen acceptor.
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6.

Вид документа : Статья из журнала
Шифр издания : Г/E 27
Автор(ы) : Kudyakova Y. S., Onoprienko A. Y., Edilova Y. O., Burgart Y. V., Saloutin V. I., Bazhin D. N.
Заглавие : Effect of the nature of a fluorinated substituent on the synthesis of functionalized 1,3-diketones
Место публикации : Russian chemical bulletin. - 2021. - Vol. 70, № 4. - С. 745-752
ББК : Г
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The synthesis of alkali metal and copper(II) 1-polyfluoroalkyl-4,4-dimethoxypentane-1,3-dionates is reported. The subsequent treatment of these compounds with oxalic acid or ethylenediaminetetraacetic acid disodium salt affords functionalized 1,3-diketones. The nature of the polyfluoroalkyl substituent was found to affect the conditions of the Claisen condensation and the stability of the acetal group in acidic medium.
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7.

Вид документа : Статья из журнала
Шифр издания : Г/S 98
Автор(ы) : Saloutin V. I., Burgart Y. V., Edilova Y. O., Slepukhin P. A., Kudyakova Y. S., Bazhin D. N.
Заглавие : Synthesis and structure of homoleptic copper complexes based on fluorinated functionalized 1,3-diketones
Место публикации : Russian chemical bulletin. - 2021. - Vol. 70, № 5. - С. 839-846
ББК : Г
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): fluorinated 1,3-diketonates--claisen condensation--acetals--transition metal diketonates
Аннотация: Mononuclear copper(II) complexes were synthesized based on fluorinated diketonates decorated with a carbonyl or acetal group. The X-ray diffraction data demonstrate the effect of the nature of the fluorinated substituent on the crystal structure of homoleptic copper(II) complexes. As opposed to 1,2,4-triketonate, the acetal moiety of 1,3-diketonate enables intermolecular coordination to the metal centers, thereby making it possible to use 1,3-diketonate in further synthesis of heterometallic structures.
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8.

Вид документа : Статья из журнала
Шифр издания : Г/S 98
Автор(ы) : Khonina T. G., Nikitina E. Yu., Shadrina E. V., Ganebnykh I. N., Valova M. S., Chupakhin O. N., Evstigneeva N. P., Kokhan M. M., Karabanalov M. S., Kuznetsov D. K.
Заглавие : Synthesis and antimicrobial activity of silicon-titanium-zinc- and silicon-titanium-boron-containing glycerohydrogels
Место публикации : Russian chemical bulletin. - 2021. - Vol. 70, № 5. - С. 967-974
ББК : Г
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Novel pharmacologically active silicon—titanium—zinc- and silicon—titanium—boron-containing glycerohydrogels were synthesized by the sol—gel method using silicon, titanium, zinc, and boron glycerolates as biocompatible precursors. The compositions and structural features of the hydrogels were studied by transmission electron microscopy, scanning electron microscopy, IR spectroscopy, atomic emission spectrometry, and elemental analysis methods. The disperse phase and liquid water—glycerol medium of the hydrogels were isolated by cold exhaustive extraction with ethanol and characterized. The 3D polymeric network of the gels is formed by the products of hydrolysis and subsequent (co)condensation of silicon-/silicon—boron-containing precursors. Titanium and zinc glycerolates undergo no hydrolytic transformations under gelation conditions and exist in the cells of the 3D polymeric network in the form of amorphous nanoparticles that are not linked to the network by covalent bonds. Models of the structures were proposed. The gels are characterized by antimicrobial activity, which is more pronounced for the silicon—titanium—boron-containing gel, and they can be considered as promising drugs for topical treatment prepared by the simple, environmentally friendly, and cost-effective method.
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Demin A. M., Kandarakov O. F., Minin A. S., Kuznetsov D. K., Uimin M. A., Shur V. Ya., Belyavsky A. V., Krasnov V. P.
Заглавие : Modification of chemically and physically obtained Fe3O4 magnetic nanoparticles with L-Lys for cell labeling
Место публикации : Russian chemical bulletin. - 2021. - Vol. 70, № 6. - С. 1199-1208
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Peculiar features of the modification of Fe3O4 magnetic nanoparticles (MNPs) obtained by co-precipitation from solutions of FeII and FeIII salts (10-nm MNPs) and by the gas-condensation method (30-nm MNPs) with 3-aminopropylsilane and then with L-lysine were studied. The chemically obtained MNPs possess more pronounced hydrophilic properties and therefore readily form stable aqueous colloidal solutions and can be loaded with a larger amount of L-Lys. However, samples based on the physically obtained MNPs were characterized by more efficient internalization and longer retention times by the NIH 3T3 cells. The results obtained can be used in the design of novel nanomaterials for magnetic cell labeling.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Khudina O. G., Ivanova A. E., Burgart Ya. V., Gerasimova N. A., Evstigneeva N. P., Saloutin V. I.
Заглавие : Synthesis of mycostatics based on 4-aryldiazenyl-3,5-dimethylpyrazoles
Место публикации : Russian chemical bulletin. - 2021. - Vol. 70, № 6. - С. 1124-1130
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 3-arylhydrazinylidenepentane-2,4-dione--condensation--hydrazines--4-aryldiazenyl-3,5-dimethylpyrazoles
Аннотация: The condensation of 3-arylhydrazinylidenepentane-2,4-diones with hydrazine hydrate, 2-hydroxyethylhydrazine, benzylhydrazine hydrochloride, and 4-hydrazinylbenzenesulfonamide hydrochloride gave 4-aryldiazenyl-3,5-dimethylpyrazoles. An alternative route to the synthesis of N-substituted 4-aryldiazenylpyrazoles is based on the alkylation of NH-pyrazoles with haloalkanes. The synthesized compounds were tested for antimicrobial activity against eight pathogenic dermatophytes, yeast-like fungi of the Candida genus and the bacteria Neisseria gonorrhoeae. The structure—activity relationship analysis showed that 4-tolyldiazenylpyrazoles bearing H, AcO(CH2)4, or HO(CH2)4 substituents at the N(1) atom have the highest mycostatic activity against all the dermatophyte strains under study. However, 4-aryldiazenyl-3,5-dimethylpyrazoles proved to be quite cytotoxic against the McCoy B cell line.
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