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Mendeleev Communications最新文献

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Enhanced performance of bimetallic catalysts based on copper phyllosilicate in the hydrogenation of dimethyl oxalate to ethylene glycol 提高基于硅酸铜的双金属催化剂在草酸二甲酯加氢制乙二醇过程中的性能
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.033
{"title":"Enhanced performance of bimetallic catalysts based on copper phyllosilicate in the hydrogenation of dimethyl oxalate to ethylene glycol","authors":"","doi":"10.1016/j.mencom.2024.06.033","DOIUrl":"10.1016/j.mencom.2024.06.033","url":null,"abstract":"<div><p>The effect of the second metal (Pt, Pd, Ni and Fe) on the activity of copper phyllosilicate-based catalysts was investigated in the selective hydrogenation of dimethyl oxalate to ethylene glycol at 160–200 °C. The prepared catalysts were characterized by XRD, DRIFTS-CO and TEM methods. The conversion achieved over 10Fe/10Cu-PhySi catalyst was 68 % at 200 °C; at the same time, the full conversion with selectivity 98% was obtained at the temperature of 180 °C over a bimetallic 1Pt/Cu-PhySi catalyst.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963700","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
Microwave assisted cycloaddition of benzonitrile oxides to 1-iodobuta-1,3-diynes 微波辅助下苯腈氧化物与 1-碘丁-1,3-二炔的环化反应
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.022
{"title":"Microwave assisted cycloaddition of benzonitrile oxides to 1-iodobuta-1,3-diynes","authors":"","doi":"10.1016/j.mencom.2024.06.022","DOIUrl":"10.1016/j.mencom.2024.06.022","url":null,"abstract":"<div><p>The microwave-assisted cycloaddition of 2,6-disubstituted benzonitrile oxides to 1-iodobuta-1,3-diynes occurs at the iodo-substituted triple bond giving predominantly 5-alkynyl-4-iodo-1,2,3-isoxazoles. The Suzuki–Miyaura and Sonogashira cross-coupling reactions were used for the modification of the thus obtained 4-iodoisoxazoles.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963699","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
Tribological characteristics of electroless Ni–P alloys as an alternative to chromium coatings: infometric analysis 作为铬涂层替代品的无电解 Ni-P 合金的摩擦学特性：信息计量分析
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.002
{"title":"Tribological characteristics of electroless Ni–P alloys as an alternative to chromium coatings: infometric analysis","authors":"","doi":"10.1016/j.mencom.2024.06.002","DOIUrl":"10.1016/j.mencom.2024.06.002","url":null,"abstract":"<div><p>Ni–P coatings, with their high microhardness (HV) and wear resistance, have been proposed as a viable alternative to hard chromium. However, wear testing experiments on electroless Ni–P coatings were conducted under a variety of conditions, including test equipment, load, substrate materials and counterface materials, resulting in unreliable comparative evaluations of experimental results. Therefore, this article presents an analysis of experimental research on Ni–P and Cr coatings, as well as a statistical analysis of the results obtained under similar conditions. The results of simultaneous wear tests on Ni–P and Cr coatings published from 1958 to 2022 were used for evaluation and comparative analysis. The relative wear of Ni–P <em>versus</em> hard Cr was calculated from experimental data and analyzed using statistical methods such as Tukey’s statistical methods, nonparametric and parametric statistics. This review found that the wear performance of electroless nickel coatings generally does not match that of hard chromium coatings. The results of this analysis indicate that: (i) Ni–P coating can be used as a protective and hardening coating; (ii) the wear resistance of the electroless Ni–P coating, being 1.9 ± 0.4 times less, does not reach the same level of wear resistance as that of hard Cr; (iii) there is a tendency for the wear resistance of Ni–P to gradually approach the wear resistance of Cr; (iv) the dependence of the wear rate on the phosphorus content of the Ni–P alloy indicates that the minimum possible wear rate is achieved at a P content of about 4–7 wt%. The search for effective alternatives to hard chromium plating is ongoing, and this review has identified several areas where effective engineering solutions could be found.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141952380","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
The synergistic effect of ultrasound and γ-radiation on Lactobacillus casei bacteria in the presence of a theraphthal sonosensitizer 超声波和 γ 射线在 theraphthal 声敏化剂作用下对干酪乳杆菌的协同效应
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.015
{"title":"The synergistic effect of ultrasound and γ-radiation on Lactobacillus casei bacteria in the presence of a theraphthal sonosensitizer","authors":"","doi":"10.1016/j.mencom.2024.06.015","DOIUrl":"10.1016/j.mencom.2024.06.015","url":null,"abstract":"<div><p>The effectiveness of the combined action of ultrasound and γ-radiation on <em>Lactobacillus casei</em> is studied. A superadditive death effect is shown, whose magnitude depends on dose levels, sequence of effects, and the presence of theraphthal (sodium salt of cobalt 4,5-octacarboxyphthalocyanine) as a sonosensitizer.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963705","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 functional allyl-α-tetrahydropyrones from cyrene 从芘合成功能性烯丙基-α-四氢吡喃酮
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.016
{"title":"Synthesis of functional allyl-α-tetrahydropyrones from cyrene","authors":"","doi":"10.1016/j.mencom.2024.06.016","DOIUrl":"10.1016/j.mencom.2024.06.016","url":null,"abstract":"<div><p>Addition of allylzinc to cyrene affords diastereomeric 4-allyl-6,8-dioxabicyclo[3.2.1]octan-4-ols. Opening of their 1,6-anhydro bridge with Ac<sub>2</sub>O followed by selective deacetylation of the resulting tertiary and acetal acetates yields diastereomeric 2-acetoxymethyl-5-allyl-tetrahydro- pyran-5,6-diols whose oxidation by the action of DMSO–Ac<sub>2</sub>O system is accompanied by etherification of tertiary hydroxy groups leading to methylthiomethoxy pyrone derivatives. The opening of 1,6-anhydro bridge in 4-allyl-6,8-dioxabicyclo[3.2.1]octan-4-ols with MeOH–HCl followed by oxidation with PCC gives individual (4<em>S</em>,6<em>S</em>)- 1-allyl-6-methoxy-2,5-dioxabicyclo[2.2.2]octan-3-one.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963706","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
Amorphization of poly(vinyl alcohol) in the mesoporous matrix based on high-density polyethylene 聚乙烯醇在基于高密度聚乙烯的介孔基质中的蜕变
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.044
{"title":"Amorphization of poly(vinyl alcohol) in the mesoporous matrix based on high-density polyethylene","authors":"","doi":"10.1016/j.mencom.2024.06.044","DOIUrl":"10.1016/j.mencom.2024.06.044","url":null,"abstract":"<div><p>Poly(vinyl alcohol) (PVA) was incorporated into the mesoporous structure of high-density polyethylene (HDPE) directly upon the tensile drawing of films <em>via</em> crazing in water–ethanol PVA solutions. The structure and thermophysical properties of the HDPE–PVA nanocomposites were explored by differential scanning calorimetry and X-ray analysis. PVA was found to exist in an amorphized state within the mesoporous structure of the HDPE host matrix since its crystallization is prevented by the spatial confinements.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141952379","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
Features of dilute methane–oxygen flame front propagation towards combustible gas flow created by the fan 稀甲烷-氧气火焰前沿向风机产生的可燃气体流传播的特点
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.035
{"title":"Features of dilute methane–oxygen flame front propagation towards combustible gas flow created by the fan","authors":"","doi":"10.1016/j.mencom.2024.06.035","DOIUrl":"10.1016/j.mencom.2024.06.035","url":null,"abstract":"<div><p>Experiments with dilute methane–oxygen mixtures at pressures of 100–200 Torr on the flame front propagation towards the flow of combustible gas created by a fan showed that both the mean flame velocity and the length of the ‘flame jump’ through a hole in a flat obstacle increase with increasing counter flow velocity; <em>i.e.</em>, the flame accelerates towards the counter flow of combustible gas from the fan.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963693","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 X-ray structure of potent anticancer 4-(4-methoxyphenyl)-3-(3,4,5-trimethoxyphenyl)isoxazole 强效抗癌剂 4-(4-甲氧基苯基)-3-(3,4,5-三甲氧基苯基)异噁唑的合成和 X 射线结构
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.013
{"title":"Synthesis and X-ray structure of potent anticancer 4-(4-methoxyphenyl)-3-(3,4,5-trimethoxyphenyl)isoxazole","authors":"","doi":"10.1016/j.mencom.2024.06.013","DOIUrl":"10.1016/j.mencom.2024.06.013","url":null,"abstract":"<div><p>The three-step synthesis of potent anticancer 4-(4-methoxy- phenyl)-3-(3,4,5-trimethoxyphenyl)isoxazole starting from 1,2,3-trimethoxy-5-(nitromethyl)benzene and anisaldehyde was developed. In phenotypic sea urchin embryo assay, this compound exhibited antimitotic antitubulin activity comparable to that of the natural cytostatic combretastatin A4 (CA4). The title isoxazole inhibited <em>in vitro</em> growth of A549 human lung cancer cells and PC-3 human prostate cancer cells with IC<sub>50</sub> values of 8 and 6 nm, respectively, exceeding the effect of CA4.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963703","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
Unsymmetrical cationic porphyrin that forms sedimentation-unstable complexes with nucleic acids 与核酸形成沉降不稳定复合物的不对称阳离子卟啉
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.018
{"title":"Unsymmetrical cationic porphyrin that forms sedimentation-unstable complexes with nucleic acids","authors":"","doi":"10.1016/j.mencom.2024.06.018","DOIUrl":"10.1016/j.mencom.2024.06.018","url":null,"abstract":"<div><p>A water-soluble cationic porphyrin containing <em>N</em>-methyl- pyridinium fragments and an indole residue, namely, 5-[4-(1-methylindol-2-yl)phenyl]-10,15,20-tris(1-methyl- pyridinium-3-yl)porphyrin triiodide, has been synthesized. The porphyrin forms sedimentation unstable complexes with low and high molecular weight nucleic acids. This ability to precipitate nucleic acids can be used in laboratory, clinical and research practice for isolating nucleic acids.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141960058","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
Reactions of 1-alkylsulfanyl- and 1-alkylsulfonyl- 2,3,5,6-tetrafluorobenzenes with nitromethane and DBU 1- 烷基硫酰基和 1- 烷基磺酰基-2,3,5,6-四氟苯与硝基甲烷和 DBU 的反应
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.021
{"title":"Reactions of 1-alkylsulfanyl- and 1-alkylsulfonyl- 2,3,5,6-tetrafluorobenzenes with nitromethane and DBU","authors":"","doi":"10.1016/j.mencom.2024.06.021","DOIUrl":"10.1016/j.mencom.2024.06.021","url":null,"abstract":"<div><p>1-Alkylsulfanyl-4-X-2,3,5,6-tetrafluorobenzenes (X = CF<sub>3</sub>, H; alkyl = Me, Bn, CHF<sub>2</sub>) upon reactions with nitromethane in the presence of DBU undergo replacement of 2 or 3-positioned fluorine atoms by a nitromethyl group to afford the corresponding (nitromethyl)trifluoroarenes. The calculations of the transition states using the DFT method correctly predict the ratios of reaction products. In the cases of relative sulfones, only 2-positioned fluorine atom undergoes substitution; however, the sulfonyl group can also be displaced by a nitromethyl moiety.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141952366","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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