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Electrochemical Removal of Hydroxyl and Diffusible Hydrogen in Aluminum Fluoride Slags of Welding Flux-Cored Wires 电化学去除药芯焊丝熔渣中羟基和可扩散氢
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2022-11-03 DOI: 10.1134/S0012500822700033
A. I. Rudskoi, S. G. Parshin
{"title":"Electrochemical Removal of Hydroxyl and Diffusible Hydrogen in Aluminum Fluoride Slags of Welding Flux-Cored Wires","authors":"A. I. Rudskoi,&nbsp;S. G. Parshin","doi":"10.1134/S0012500822700033","DOIUrl":"10.1134/S0012500822700033","url":null,"abstract":"<p>This paper presents the scientific and technological principles of electrochemical removal of diffusible hydrogen by reactions of hydroxyl and hydrogen in molten aluminum fluoride slag and in the gas phase. A model was proposed for the electrochemical processes in the weld pool with the formation of aluminum fluoride polymer clusters in TiO<sub>2</sub>–CaF<sub>2</sub>–Na<sub>3</sub>AlF<sub>6</sub> slag to reduce the content of diffusible hydrogen, decrease the volume of slag inclusions, and improve the mechanical properties of bainitic steel welded joints.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"504 2","pages":"118 - 121"},"PeriodicalIF":0.8,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4137964","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
Spectral Characteristics of Quartz Glass Smelted by Vacuum Compression Technology from Various Types of Raw Materials 不同原料真空压缩法制备石英玻璃的光谱特性
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2022-11-03 DOI: 10.1134/S0012500822700045
A. S. Lebedev,  V. N. Anfilogov, V. G. Kuz’min, V. M. Ryzhkov
{"title":"Spectral Characteristics of Quartz Glass Smelted by Vacuum Compression Technology from Various Types of Raw Materials","authors":"A. S. Lebedev,&nbsp; V. N. Anfilogov,&nbsp;V. G. Kuz’min,&nbsp;V. M. Ryzhkov","doi":"10.1134/S0012500822700045","DOIUrl":"10.1134/S0012500822700045","url":null,"abstract":"<p>A study was made of glass samples obtained from highly purified natural quartz, synthetic silica, and glass grit made of synthetic quartz crystals smelted according to a technology that included elements of the KS-4V technology. It was determined that the transmission spectra of the glasses smelted from various materials have differences in the UV and IR regions.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"504 2","pages":"122 - 125"},"PeriodicalIF":0.8,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4140163","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
Oxidative C–O Coupling: Radical and Ionic Pathways of Reaction in Bu4NI/t-BuOOH System 氧化C-O偶联:Bu4NI/t-BuOOH体系反应的自由基和离子途径
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2022-11-02 DOI: 10.1134/S0012500822600092
E. R. Lopat’eva, I. B. Krylov, I. V. Kuzmin, S. V. Suchkov,  A. O. Terent’ev
{"title":"Oxidative C–O Coupling: Radical and Ionic Pathways of Reaction in Bu4NI/t-BuOOH System","authors":"E. R. Lopat’eva,&nbsp;I. B. Krylov,&nbsp;I. V. Kuzmin,&nbsp;S. V. Suchkov,&nbsp; A. O. Terent’ev","doi":"10.1134/S0012500822600092","DOIUrl":"10.1134/S0012500822600092","url":null,"abstract":"<p>The Bu<sub>4</sub>NI/<i>t-</i>BuOOH oxidative system is widely used in organic synthesis, but mechanistic principles underlying its reactivity are only partially explored. In this work, drawing on the example of the oxidative C–O coupling reaction between compounds with a carbonyl group and (or) a benzyl moiety with <i>N</i>-hydroxyphthalimide, it has been discovered that the coupling with the CH-acidic fragment of the carbonyl group proceeds <i>via</i> ionic mechanism, and the coupling with the benzyl fragment proceeds <i>via</i> radical mechanism. When dimethylacetamide is used as a solvent, the ionic process with the participation of the carbonyl group prevails, while in MeCN the radical process involving the benzyl moiety is realized along with the ionic process. For the oxidative C–O coupling with participation of the benzyl moiety without affecting the α-CH fragment of the carbonyl group, it is advisable to use PhI(OAc)<sub>2</sub>, Ce(NH<sub>4</sub>)<sub>2</sub>(NO<sub>2</sub>)<sub>6</sub>, or <i>t‑</i>BuOO<i>t-</i>Bu as oxidants for which only radical pathway is characteristic.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"504 1","pages":"67 - 73"},"PeriodicalIF":0.8,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4099532","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
Interaction of 2-Amino-1,3,4-thiadiazoles with 1,2,4-Triazine-5-carbonitriles 2-氨基-1,3,4-噻二唑与1,2,4-三嗪-5-碳腈的相互作用
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2022-11-02 DOI: 10.1134/S0012500822600146
A. P. Krinochkin, Ya. K. Shtaitz, E. A. Kudryashova, E. D. Ladin, D. S. Kopchuk, G. V. Zyryanov, Yu. M. Shafran, E. V. Nosova,  O. N. Chupakhin
{"title":"Interaction of 2-Amino-1,3,4-thiadiazoles with 1,2,4-Triazine-5-carbonitriles","authors":"A. P. Krinochkin,&nbsp;Ya. K. Shtaitz,&nbsp;E. A. Kudryashova,&nbsp;E. D. Ladin,&nbsp;D. S. Kopchuk,&nbsp;G. V. Zyryanov,&nbsp;Yu. M. Shafran,&nbsp;E. V. Nosova,&nbsp; O. N. Chupakhin","doi":"10.1134/S0012500822600146","DOIUrl":"10.1134/S0012500822600146","url":null,"abstract":"<p>A possibility of preparation of 1,2,4-triazines with a residue of 2-amino-1,3,4-thiadiazoles at the C5 position by the solvent-free reaction of <i>ipso</i>-amination of 3,6-di(het)aryl-1,2,4-triazine-5-carbonitriles has been studied. It has been found that the reaction also leads to the corresponding 5-amino-1,2,4-triazines as minor products.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"504 1","pages":"79 - 82"},"PeriodicalIF":0.8,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4099539","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
Processes in H2PtCl6 ⋅ 6H2O–Solvent Systems. Part I: Alcohol Solutions H2PtCl6·6h2o -溶剂体系中的工艺。第一部分:酒精解决方案
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2022-11-02 DOI: 10.1134/S0012500822600122
N. V. Klimova, A. G. Ivanov, A. V. Lebedev,  P. A. Storozhenko
{"title":"Processes in H2PtCl6 ⋅ 6H2O–Solvent Systems. Part I: Alcohol Solutions","authors":"N. V. Klimova,&nbsp;A. G. Ivanov,&nbsp;A. V. Lebedev,&nbsp; P. A. Storozhenko","doi":"10.1134/S0012500822600122","DOIUrl":"10.1134/S0012500822600122","url":null,"abstract":"<p>Transformation of H<sub>2</sub>PtCl<sub>6</sub> over time under the action of 2-octanol has been studied by NMR, IR spectroscopy, GLC, and GC/MS. It has been found for the first time that the alcohol in a H<sub>2</sub>PtCl<sub>6</sub> ⋅ 6H<sub>2</sub>O–2-octanol solution is hydrochlorinated to give 2-chlorooctane. Dehydrated platinum chlorides catalyze the elimination of methyl groups in trimethylchlorosilane and hexamethyldisiloxane, which leads to the formation of polydimethylsiloxanes. It has been assumed that the resulting π-complex of H<sub>2</sub>PtCl<sub>4</sub> with octene-1 is not stable in a hydrochloric medium and rapidly decomposes to release chloroalkyl.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"504 1","pages":"88 - 91"},"PeriodicalIF":0.8,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4100582","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
Original Synthesis of Enyne Dicarboxylic Acids 炔二羧酸的原始合成
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2022-11-02 DOI: 10.1134/S0012500822600079
S. A. Sokov, S. S. Zlotsky, A. V. Vologzhanina, A. A. Golovanov
{"title":"Original Synthesis of Enyne Dicarboxylic Acids","authors":"S. A. Sokov,&nbsp;S. S. Zlotsky,&nbsp;A. V. Vologzhanina,&nbsp;A. A. Golovanov","doi":"10.1134/S0012500822600079","DOIUrl":"10.1134/S0012500822600079","url":null,"abstract":"<p>The condensation of arylpropargyl aldehydes with malonic acid in AcOH has led to the formation of 2-(3-arylprop-2-yn-1-ylidene)malonic acids in 68–85% yields. A similar reaction with 4-fluorophenylpropargyl aldehyde in ethanol in the presence of 2-aminopyridine has resulted in intramolecular cyclization to give previously unknown 5-(4-fluorobenzylidene)-2-oxo-2,5-dihydrofuran-3-carboxylate. The structure of this compound has been studied in detail by X-ray diffraction.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"504 1","pages":"83 - 87"},"PeriodicalIF":0.8,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4099533","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
New Method for the Synthesis of Phenylglyoxal Derivatives 苯乙二醛衍生物合成的新方法
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2022-11-02 DOI: 10.1134/S0012500822600109
Yu. V. Myasoedova, G. N. Sakhabutdinova, E. R. Belyaeva, G. Z. Raskil’dina, G. Yu. Ishmuratov, S. S. Zlotsky
{"title":"New Method for the Synthesis of Phenylglyoxal Derivatives","authors":"Yu. V. Myasoedova,&nbsp;G. N. Sakhabutdinova,&nbsp;E. R. Belyaeva,&nbsp;G. Z. Raskil’dina,&nbsp;G. Yu. Ishmuratov,&nbsp;S. S. Zlotsky","doi":"10.1134/S0012500822600109","DOIUrl":"10.1134/S0012500822600109","url":null,"abstract":"<p>The paper proposes a new one-pot ozonolytic synthesis of acylhydrazones from phenylacrolein acetals, which includes ozonolytic cleavage of the substrate in methanol and treatment of the intermediate peroxides with hydrazides of capric, nicotinic, isonicotinic, benzoic, and <i>para</i>-hydroxybenzoic acids taken in excess.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"504 1","pages":"74 - 78"},"PeriodicalIF":0.8,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4099828","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
Polymerization of 2-(Perfluorohexyl)ethyl Methacrylate in the Presence of 2-Cyano-2-propyl Dithiobenzoate in Supercritical CO2 超临界CO2中2-氰基-2-丙基二硫苯甲酸酯存在下2-(全氟己基)甲基丙烯酸乙酯的聚合
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2022-06-20 DOI: 10.1134/S0012500822040012
K. E. Chekurov, A. I. Barabanova, I. V. Blagodatskikh, O. V. Vyshivannaya, A. V. Muranov, A. S. Peregudov,  A. R. Khokhlov
{"title":"Polymerization of 2-(Perfluorohexyl)ethyl Methacrylate in the Presence of 2-Cyano-2-propyl Dithiobenzoate in Supercritical CO2","authors":"K. E. Chekurov,&nbsp;A. I. Barabanova,&nbsp;I. V. Blagodatskikh,&nbsp;O. V. Vyshivannaya,&nbsp;A. V. Muranov,&nbsp;A. S. Peregudov,&nbsp; A. R. Khokhlov","doi":"10.1134/S0012500822040012","DOIUrl":"10.1134/S0012500822040012","url":null,"abstract":"<p>The radical polymerization of 2-(perfluorohexyl)ethyl methacrylate (FHEMA) initiated by azobis(isobutyronitrile) in the presence of a commercially available chain transfer agent, 2-cyano-2-propyl dithiobenzoate, carried out in trifluorotoluene (TFT) or in supercritical carbon dioxide (scCO<sub>2</sub>) was studied for the first time. The conditions were found under which the FHEMA polymerization in TFT or in scCO<sub>2</sub> proceeds under homogeneous conditions with reversible chain transfer <i>via</i> the addition–fragmentation mechanism.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"503 2","pages":"57 - 62"},"PeriodicalIF":0.8,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4793221","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
Organic Polyradicals Based on Acenes. Computational Modeling 基于苯乙烯的有机多自由基。计算模型
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2022-06-20 DOI: 10.1134/S0012500822030028
A. G. Starikov, M. G. Chegerev, A. A. Starikova,  V. I. Minkin
{"title":"Organic Polyradicals Based on Acenes. Computational Modeling","authors":"A. G. Starikov,&nbsp;M. G. Chegerev,&nbsp;A. A. Starikova,&nbsp; V. I. Minkin","doi":"10.1134/S0012500822030028","DOIUrl":"10.1134/S0012500822030028","url":null,"abstract":"<div><div><h3>\u0000 <b>Abstract</b>\u0000 </h3><p>New organic polyspin molecules constructed on the basis of acenes and stable radicals (1,2,3,5-di-thiadiazolyl, 1,5-dimethyl-6-oxoverdazyl, and (2,2,6,6-tetramethylpiperidin-1-yl)oxyl) have been predicted by means of quantum-chemical calculations. Among the studied tetraradical systems, the structures characterized by antiferromagnetic exchange interactions between the unpaired electrons of the radical substituents and ferromagnetic coupling of paramagnetic centers of the acenes and radical groups have been revealed.</p></div></div>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"503 1","pages":"51 - 55"},"PeriodicalIF":0.8,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4799007","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: 1
Luminescence of Terbium Ions in Aqueous Solutions of Sodium Styrene Sulfonate Copolymers with 4-Methacrylamidosalicylic Acid 铽离子在苯乙烯磺酸钠与4-甲基丙烯酰胺水杨酸共聚物水溶液中的发光研究
IF 0.8 4区 化学
Doklady Chemistry Pub Date : 2022-06-20 DOI: 10.1134/S0012500822040024
T. N. Nekrasova, N. A. Nesterova, A. I. Fischer, I. I. Gavrilova, A. P. Katasonova,  E. F. Panarin
{"title":"Luminescence of Terbium Ions in Aqueous Solutions of Sodium Styrene Sulfonate Copolymers with 4-Methacrylamidosalicylic Acid","authors":"T. N. Nekrasova,&nbsp;N. A. Nesterova,&nbsp;A. I. Fischer,&nbsp;I. I. Gavrilova,&nbsp;A. P. Katasonova,&nbsp; E. F. Panarin","doi":"10.1134/S0012500822040024","DOIUrl":"10.1134/S0012500822040024","url":null,"abstract":"<p>Water-soluble copolymers of sodium styrene sulfonate and 4-methacrylamidosalicylic acid of 93.7 mol % composition have been synthesized, and their interaction with terbium and gadolinium ions has been investigated to fabricate luminescent probes promising for their visualization in biomedical research. It has been shown that, in aqueous solutions in the copolymer concentration range 0.15–1.7 mg mL<sup>–1</sup> and at the ratio [Tb<sup>3+</sup>]/[COO<sup>–</sup>] = 1, water-soluble luminescent metal polymer complexes with a luminescence lifetime of 823 µs are formed. When Tb<sup>3+</sup> ions are partially replaced in the complex by Gd<sup>3+</sup> ions, bimetallic complexes with intense luminescence are formed.</p>","PeriodicalId":530,"journal":{"name":"Doklady Chemistry","volume":"503 2","pages":"63 - 66"},"PeriodicalIF":0.8,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5093175","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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