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Antifriction Composites Based on a Two-Component Modified Phenol–Formaldehyde Binder 基于双组分改性苯酚-甲醛粘合剂的减摩复合材料
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2024-03-08 DOI: 10.1134/S0012500823601080
M. O. Panova, D. I. Buyaev, V. V. Shaposhnikova
{"title":"Antifriction Composites Based on a Two-Component Modified Phenol–Formaldehyde Binder","authors":"M. O. Panova,&nbsp;D. I. Buyaev,&nbsp;V. V. Shaposhnikova","doi":"10.1134/S0012500823601080","DOIUrl":"10.1134/S0012500823601080","url":null,"abstract":"<p>New polymer composite materials (PCMs) were obtained based on a mixture of phenol–formaldehyde and phthalide-containing phenol–formaldehyde resole-type binders reinforced with polyoxadiazole fiber, and their tribological properties were investigated. A study was made of the effect of the content of the phthalide-containing phenol–formaldehyde polymer in the two-component mixture of binders on the hardness of the surface layer and the tribological and thermofrictional properties of the PCM in various systems of dry friction on steel. It was shown that the resulting PCMs are superior in tribological and thermofrictional properties to PCMs based on phenol–formaldehyde or phthalide-containing phenol–formaldehyde resole-type binders.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"514 1","pages":"21 - 25"},"PeriodicalIF":0.8,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140073684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis of Novel Composite Sorbents Based on Titanium, Calcium, and Magnesium Phosphates 基于钛、钙和镁磷酸盐的新型复合吸附剂的合成
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2024-03-08 DOI: 10.1134/S0012500824600020
N. V. Mudruk, M. V. Maslova,  A. I. Nikolaev
{"title":"Synthesis of Novel Composite Sorbents Based on Titanium, Calcium, and Magnesium Phosphates","authors":"N. V. Mudruk,&nbsp;M. V. Maslova,&nbsp; A. I. Nikolaev","doi":"10.1134/S0012500824600020","DOIUrl":"10.1134/S0012500824600020","url":null,"abstract":"<p>Heterogeneous and mechanochemical syntheses of new materials based on titanium, calcium, and magnesium phosphates were developed for the first time. The products demonstrated high efficiency as sorbents for the removal of heavy metal cations and radionuclides from solutions. The joint action of the sorption components ensures high sorption capacity towards various cations over a wide pH range. The optimal conditions providing products with a specified phase composition were identified. The use of a solution of a phosphorus-containing agent and solid precursors taken in a stoichiometric ratio, together with mild hydrothermal conditions make it possible to minimize the amount of liquid waste. In the first step of the synthesis, precipitation of titanium phosphate and formation of the precursor needed for the second step (formation of calcium and magnesium phosphates) take place simultaneously. Thus, the synthesis protocol complies with the green chemistry principles.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"514 2","pages":"42 - 49"},"PeriodicalIF":0.8,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140073686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
C(2)H-Alkylation of (Benz)oxazoles with Tertiary Alkyl Chlorides and Bromides under Photoinduced Palladium Catalysis 在光诱导钯催化下，(苯)恶唑与叔烷基氯化物和溴化物的 C(2)H 烷基化反应
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2024-02-28 DOI: 10.1134/S0012500823600815
I. V. Lavrentev, A. V. Astakhov, K. E. Shepelenko, V. M. Chernyshev
{"title":"C(2)H-Alkylation of (Benz)oxazoles with Tertiary Alkyl Chlorides and Bromides under Photoinduced Palladium Catalysis","authors":"I. V. Lavrentev,&nbsp;A. V. Astakhov,&nbsp;K. E. Shepelenko,&nbsp;V. M. Chernyshev","doi":"10.1134/S0012500823600815","DOIUrl":"10.1134/S0012500823600815","url":null,"abstract":"<p>A method has been developed for the selective C(2)H alkylation of (benz)oxazoles with tertiary alkyl chlorides and alkyl bromides under visible light-induced (460 nm) catalysis with the Pd(PPh<sub>3</sub>)<sub>4</sub>/[Bu<sub>4</sub>N]I system in <i>N,N</i>-dimethylacetamide. The tetraalkylammonium salt has a significant promoting effect on the reaction, which seems to be based on the stabilization of nanosized palladium species in the catalytic system.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"513 1","pages":"327 - 336"},"PeriodicalIF":0.8,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140007622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Unconventional Approach to the Synthesis of Nickel and Platinum Complexes of 1,3,6-Azadiphosphacycloheptanes 以非常规方法合成 1,3,6-叠氮磷杂环庚烷的镍和铂络合物
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2024-02-28 DOI: 10.1134/S0012500823600827
E. I. Musina, I. D. Strelnik, I. A. Litvinov,  A. A. Karasik
{"title":"Unconventional Approach to the Synthesis of Nickel and Platinum Complexes of 1,3,6-Azadiphosphacycloheptanes","authors":"E. I. Musina,&nbsp;I. D. Strelnik,&nbsp;I. A. Litvinov,&nbsp; A. A. Karasik","doi":"10.1134/S0012500823600827","DOIUrl":"10.1134/S0012500823600827","url":null,"abstract":"<p>A new method has been proposed for the synthesis of bis(phosphine sulfides) and nickel and platinum chelate complexes of 1,3,6-azadiphosphacycloheptanes. The method is based on the ability of 14-membered 3,6,10,13-diazadiphosphacyclotetradecanes to undergo a reversible transformation in solutions into a mixture of <i>meso-</i> and <i>rac</i>-isomers of seven-membered bis-phosphines. The reaction of 3,6,10,13-diazadiphosphacyclotetradecanes with elementary sulfur results in 14-membered tetrakis(phosphine sulfides) or seven-membered bis(phosphine sulfides), depending on the reaction conditions. The reaction of 1,3,6-azadiphosphacycloheptanes, resulting from the reversible dissociation of 14-membered tetraphosphines in chloroform, with Ni(CH<sub>3</sub>CN)<sub>6</sub>(BF<sub>4</sub>)<sub>2</sub> and Pt(COD)Cl<sub>2</sub> gives the corresponding chelate complexes. The structures of the <i>meso</i>-isomer of 1-cyclohexyl-3,6-diphenyl-1-aza-3,6-diphosphacycloheptane-3,6-disulfide, bis-(κ<sup>2</sup>-1-isopropyl-3,6-diphenyl-1-aza-3,6-diphosphacycloheptane)nickel bis(tetrafluoroborate), bis-(κ<sup>2</sup>-1-cyclohexyl-3,6-diphenyl-1-aza-3,6-diphosphacycloheptane)chloronickel tetrafluoroborate, and <i>cis</i>-dichloro-(κ<sup>2</sup>-1-cyclohexyl-3,6-diphenyl-1-aza-3,6-diphosphacycloheptane)platinum(II), isolated in crystalline form, have been confirmed by single crystal X-ray diffraction.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"513 1","pages":"342 - 350"},"PeriodicalIF":0.8,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140007615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis and Structure of New [5]Ferrocenophane 新型 [5]ferrocenophane 的合成与结构
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2024-02-28 DOI: 10.1134/S0012500823600840
A. V. Medved’ko, A. V. Churakov, D. P. Krut’ko, S. Z. Vatsadze
{"title":"Synthesis and Structure of New [5]Ferrocenophane","authors":"A. V. Medved’ko,&nbsp;A. V. Churakov,&nbsp;D. P. Krut’ko,&nbsp;S. Z. Vatsadze","doi":"10.1134/S0012500823600840","DOIUrl":"10.1134/S0012500823600840","url":null,"abstract":"<p>The first example of intramolecular diastereoselective domino reaction of ferrocene 1,1'-bis-enone to [5]ferrocenophane initiated with sodium ethoxide was found. The product is [5]ferrocenophane with two pyridyl and one ethoxy substituents arranged asymmetrically in a five-carbon bridge. Diffraction studies showed that ferrocene is in almost ideal eclipsed conformation. The fan conformation found in the crystal is also preserved in solution, which was determined by NMR spectroscopy.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"513 2","pages":"375 - 379"},"PeriodicalIF":0.8,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140007746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Combined Production of Hydrogen and Methanol without CO2 Emission Based on Matrix Conversion of Natural Gas 基于天然气基质转换的无二氧化碳排放的氢气和甲醇联合生产技术
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2024-01-31 DOI: 10.1134/S0012500823601018
V. S. Arutyunov, A. V. Nikitin, V. I. Savchenko, I. V. Sedov
{"title":"Combined Production of Hydrogen and Methanol without CO2 Emission Based on Matrix Conversion of Natural Gas","authors":"V. S. Arutyunov,&nbsp;A. V. Nikitin,&nbsp;V. I. Savchenko,&nbsp;I. V. Sedov","doi":"10.1134/S0012500823601018","DOIUrl":"10.1134/S0012500823601018","url":null,"abstract":"<p>Reducing carbon dioxide emissions during production is one of the main trends in modern oil and gas chemistry. One of the most realistic possibilities for achieving this is to involve carbon dioxide generated in technological processes as a feedstock for producing gas chemical products. The maximum effect can be achieved in the production of large-scale chemicals, such as syngas, hydrogen, and methanol. We consider such possibilities and present a new combined autothermal process for the joint production of hydrogen and methanol based on non-catalytic matrix conversion of natural gas into syngas, which allows one to almost avoid CO<sub>2</sub> emissions.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"513 2","pages":"361 - 366"},"PeriodicalIF":0.8,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139645053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis of a Polyfunctional Dendron Based on Gallic Acid Using the Azide–Alkyne Cycloaddition Reaction 利用叠氮-炔烃环加成反应合成基于没食子酸的多官能团树枝状化合物
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2024-01-31 DOI: 10.1134/S001250082360102X
A. M. Fatykhova, V. A. Burilov, S. E. Solovieva,  I. S. Antipin
{"title":"Synthesis of a Polyfunctional Dendron Based on Gallic Acid Using the Azide–Alkyne Cycloaddition Reaction","authors":"A. M. Fatykhova,&nbsp;V. A. Burilov,&nbsp;S. E. Solovieva,&nbsp; I. S. Antipin","doi":"10.1134/S001250082360102X","DOIUrl":"10.1134/S001250082360102X","url":null,"abstract":"<p>A first-generation triazole-containing dendron with hydroxypropyltriazole groups and a tetraethylene glycol linker was synthesized for the first time by stepwise modification of gallic acid by the azide–alkyne cycloaddition reaction. The structures of all intermediate compounds have been proven by advanced physical methods. It has been found that, due to the high mobility of the bromine atom in the benzylic position, the use of bromomethylene gallic acid derivatives in the synthesis of triazole-containing dendrons gives by-products resulting from alkylation of the bases used in the reaction (triethylamine and diisopropylethylamine).</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"513 1","pages":"321 - 326"},"PeriodicalIF":0.8,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139645038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient Synthesis of Optically Pure Mono- and Binuclear Macrocyclic Polylactones from Castor Oil and Sebacic Acid 利用蓖麻油和癸二酸高效合成光学纯度较高的单核和双核大环多内酯
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2024-01-31 DOI: 10.1134/S0012500823601031
G. Yu. Ishmuratov, N. I. Medvedeva, K. M. Saitov, M. P. Yakovleva, I. S. Nazarov,  A. G. Tolstikov
{"title":"Efficient Synthesis of Optically Pure Mono- and Binuclear Macrocyclic Polylactones from Castor Oil and Sebacic Acid","authors":"G. Yu. Ishmuratov,&nbsp;N. I. Medvedeva,&nbsp;K. M. Saitov,&nbsp;M. P. Yakovleva,&nbsp;I. S. Nazarov,&nbsp; A. G. Tolstikov","doi":"10.1134/S0012500823601031","DOIUrl":"10.1134/S0012500823601031","url":null,"abstract":"<p>An efficient synthesis of optically pure macrocyclic mono- and binuclear polylactones has been proposed. The synthesis is based on the condensation of natural triol, castor oil, with sebacoyl dichloride in 1 : 1 or 1 : 2 ratios in boiling carbon tetrachloride in the presence of triethylamine and <i>N</i>,<i>N</i>-dimethylaminopyridine as a catalyst.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"513 1","pages":"315 - 320"},"PeriodicalIF":0.8,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139645335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of the Antitumor Activity in Vitro of Iodo-δ-Lactones of 5Z,9Z-Dienoic Acid 5Z,9Z-Dienoic Acid 的碘δ-内酯体外抗肿瘤活性研究
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2024-01-31 DOI: 10.1134/S0012500823700209
E. Kh. Makarova, I. V. Ishbulatov, A. A. Makarov, L. U. Dzhemileva,  U. M. Dzhemilev, V. A. D’yakonov
{"title":"Study of the Antitumor Activity in Vitro of Iodo-δ-Lactones of 5Z,9Z-Dienoic Acid","authors":"E. Kh. Makarova,&nbsp;I. V. Ishbulatov,&nbsp;A. A. Makarov,&nbsp;L. U. Dzhemileva,&nbsp; U. M. Dzhemilev,&nbsp;V. A. D’yakonov","doi":"10.1134/S0012500823700209","DOIUrl":"10.1134/S0012500823700209","url":null,"abstract":"<p>Previously unknown phenyl-substituted iodo-δ-lactone derived from 11‑phenylundeca-5<i>Z</i>,9<i>Z</i>-dienoic acid was synthesized in 94% yield using the Ti-catalyzed intermolecular cross-cyclomagnesiation of aromatic 1,2-diene with O‑containing allene at the key stage. The in vitro cytotoxic activity of synthesized alkyl- and phenyl-substituted iodo-δ-lactones of 5<i>Z</i>,9<i>Z</i>-dienoic acids against the Jurkat, K562, U937, HL60, and Hek293 cell lines was studied, and their effect on the cell cycle and the ability to induce apoptosis were investigated using flow cytometry.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"513 2","pages":"367 - 374"},"PeriodicalIF":0.8,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139645175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis of New Polyfunctional Cyclic Ketals Based on Substituted 4-Methylene-1,3-dioxolanes 基于取代的 4-亚甲基-1,3-二氧戊环的新型多官能环酮的合成
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2024-01-31 DOI: 10.1134/S0012500823601043
Yu. G. Borisova, G. Z. Raskildina, E. R. Belyaeva, A. I. Musin, R. M. Sultanova, S. S. Zlotskii
{"title":"Synthesis of New Polyfunctional Cyclic Ketals Based on Substituted 4-Methylene-1,3-dioxolanes","authors":"Yu. G. Borisova,&nbsp;G. Z. Raskildina,&nbsp;E. R. Belyaeva,&nbsp;A. I. Musin,&nbsp;R. M. Sultanova,&nbsp;S. S. Zlotskii","doi":"10.1134/S0012500823601043","DOIUrl":"10.1134/S0012500823601043","url":null,"abstract":"<p>Methods have been proposed for the preparation of new polyfunctional heterocyclic compounds based on the addition of dichlorocarbene and ethanol to the terminal double bond of 2,2-disubstituted 4-methylene-1,3-dioxolanes, as well as on hydrogenation and ozonolysis of this bond.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"513 2","pages":"393 - 396"},"PeriodicalIF":0.8,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139645236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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