Journal of Organometallic Chemistry最新文献_第7页

A convenient synthesis of Os3(CO)12 from OsO4 and formic acid

IF 2.1 3区化学

Journal of Organometallic Chemistry Pub Date : 2025-02-01 DOI: 10.1016/j.jorganchem.2024.123480

Elumalai Kumaran, Weng Kee Leong

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Transesterification of glycerol with dimethyl carbonate for the synthesis of glycerol carbonate and glycidol by Iron (III) salen complex

IF 2.1 3区化学

Journal of Organometallic Chemistry Pub Date : 2025-02-01 DOI: 10.1016/j.jorganchem.2024.123467

Long-Yat Lai, Pak-Chung Lau, Tsz-Lung Kwong, Ka-Fu Yung

{"title":"Transesterification of glycerol with dimethyl carbonate for the synthesis of glycerol carbonate and glycidol by Iron (III) salen complex","authors":"Long-Yat Lai, Pak-Chung Lau, Tsz-Lung Kwong, Ka-Fu Yung","doi":"10.1016/j.jorganchem.2024.123467","DOIUrl":"10.1016/j.jorganchem.2024.123467","url":null,"abstract":"<div><div>The transesterification of glycerol and dimethyl carbonate (DMC) was investigated in the presence of <span><math><mi>μ</mi></math></span>-oxo-Fe(salen)<sub>2</sub> under the optimal reaction condition. Several transition metal(salen) were tested, and only Fe (salen) shows an excellent results towards transesterification of glycerol. Therefore, Fe (salen) was characterized by IR, elemental analysis, MS, XPS and Surface Basicity test, and it can be confirmed that the as-synthesized Fe(salen) was existed in the form of <span><math><mi>μ</mi></math></span>-oxo-Fe(salen)<sub>2</sub>. It was proposed that the <span><math><mi>μ</mi></math></span>-oxo-Fe(salen)<sub>2</sub> can provide two different reaction pathway based on its molecular structures and the electronic configuration of iron itself. <span><math><mi>μ</mi></math></span>-oxo-Fe(salen)<sub>2</sub> was reacted with the mixture of glycerol and DMC under microwave-heating in 60 min at 100 °C and at the molar ratio of glycerol:DMC:<span><math><mi>μ</mi></math></span>-oxo-Fe(salen)<sub>2</sub> of 1:2:0.01 and obtaining the highest glycerol carbonate yield of 93.8 %.</div></div>","PeriodicalId":374,"journal":{"name":"Journal of Organometallic Chemistry","volume":"1025 ","pages":"Article 123467"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Sequential phase transfer catalysis–hydrosilylation as an efficient method for the synthesis of polyfluorinated triethoxysilanes

IF 2.1 3区化学

Journal of Organometallic Chemistry Pub Date : 2025-02-01 DOI: 10.1016/j.jorganchem.2024.123483

M.A. Stepanov, Yu.I. Bolgova, O.M. Trofimova, E.F. Belogolova, A.I. Emel'yanov, A.I. Albanov, A.S. Pozdnyakov

{"title":"Sequential phase transfer catalysis–hydrosilylation as an efficient method for the synthesis of polyfluorinated triethoxysilanes","authors":"M.A. Stepanov, Yu.I. Bolgova, O.M. Trofimova, E.F. Belogolova, A.I. Emel'yanov, A.I. Albanov, A.S. Pozdnyakov","doi":"10.1016/j.jorganchem.2024.123483","DOIUrl":"10.1016/j.jorganchem.2024.123483","url":null,"abstract":"<div><div>An efficient approach to obtain of polyfluorinated triethoxysilanes H(CF<sub>2</sub>)<sub>n</sub>CH<sub>2</sub>O(CH<sub>2</sub>)<sub>3</sub>Si(OEt)<sub>3</sub> with high yields, is presented using a sequential reactions of phase transfer catalysis and hydrosilylation. Tetrabutylammonium bromide and Speier's catalyst (200 ppm) were used as catalysts. The hydrosilylation reaction proceeds rather quickly within 1–3 h under mild conditions at room temperature. <sup>1</sup>H NMR monitoring indicates a selective process with the formation of only the main γ-addition product. The individuality of the synthesized triethoxy(polyfluoroalkoxy)propyl silanes have been confirmed by FTIR, <sup>1</sup>H, <sup>13</sup>C, <sup>19</sup>F, and <sup>29</sup>Si NMR spectroscopy and elemental analysis. Quantum chemical calculations have shown that with a decrease in the number of electronegative fragments CF<sub>2</sub> in the molecule, an increase in the energetic favorability of the hydrosilylation reaction is observed. The prospects for using the obtained fluorosilanes in polymer systems are discussed.</div></div>","PeriodicalId":374,"journal":{"name":"Journal of Organometallic Chemistry","volume":"1025 ","pages":"Article 123483"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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A comparative study of CH and mCH mechanisms in hydrosilylation reactions

IF 2.1 3区化学

Journal of Organometallic Chemistry Pub Date : 2025-02-01 DOI: 10.1016/j.jorganchem.2024.123451

Manxin Hong , Zhengjian Qi , Yu Sun

{"title":"A comparative study of CH and mCH mechanisms in hydrosilylation reactions","authors":"Manxin Hong , Zhengjian Qi , Yu Sun","doi":"10.1016/j.jorganchem.2024.123451","DOIUrl":"10.1016/j.jorganchem.2024.123451","url":null,"abstract":"<div><div>The cyclic process of Si-H oxidation addition, olefin insertion, and reductive elimination was discussed by density functional theory (DFT) and high-precision quantum chemical calculations. All the calculations were performed at the B3LYP-D3/def2-TZVP level. Two fundamental mechanisms of Chalk-Harrod (CH) and modified Chalk-Harrod (mCH) were explored, in the perspective of computational chemistry. Pt(PH<sub>3</sub>)<sub>2</sub> was used as model for the renowned Speier's catalyst, while HSiR (R=(CH<sub>3</sub>)<sub>3</sub> and CH<sub>3</sub>(OSi(CH<sub>3</sub>)<sub>3</sub>)<sub>2</sub> and CH<sub>2</sub>=CHR’ (R’=<em>H</em>, CH<sub>2</sub>OH and CH<sub>2</sub>OCH<sub>2</sub>CH<sub>2</sub>OH) were used as the reactant models. Significant findings include the identification of the olefin insertion as the rate-determining step in both mechanisms.The energy barrier of rate-determining step was 27.6 kcal/mol and 41.0 kcal/mol, respectively, according to the CH mechanism and the mCH mechanism, when HSi(CH<sub>3</sub>)<sub>3</sub> and CH<sub>2</sub>=CH<sub>2</sub> were used as the reactant models. But the barrier of rate-determining step become to 27.2 kcal/mol and 28.4 kcal/mol, when HSiCH<sub>3</sub>(OSi(CH<sub>3</sub>)<sub>3</sub>)<sub>2</sub> and CH<sub>2</sub>=CHCH<sub>2</sub>OCH<sub>2</sub>CH<sub>2</sub>OH were used as the reactant models. The difference in energy barriers betweeen the CH and mCH mechanisms become closer as the reactant models increase. The reaction between polyhydrosiloxane and allyl polyether may very potentially follow the mCH mechanism rather than CH mechanism.</div></div>","PeriodicalId":374,"journal":{"name":"Journal of Organometallic Chemistry","volume":"1025 ","pages":"Article 123451"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Application of supported palladium nanoparticles over chitosan-agarose encapsulated Fe3O4 microspheres as efficient catalyst in the Sonogashira cross-coupling reactions

IF 2.1 3区化学

Journal of Organometallic Chemistry Pub Date : 2025-02-01 DOI: 10.1016/j.jorganchem.2025.123553

Ali Kakanejadifard , Parisa Safarimehr , Bikash Karmakar , Mozhgan Pirhayati , Hojat Veisi

{"title":"Application of supported palladium nanoparticles over chitosan-agarose encapsulated Fe3O4 microspheres as efficient catalyst in the Sonogashira cross-coupling reactions","authors":"Ali Kakanejadifard , Parisa Safarimehr , Bikash Karmakar , Mozhgan Pirhayati , Hojat Veisi","doi":"10.1016/j.jorganchem.2025.123553","DOIUrl":"10.1016/j.jorganchem.2025.123553","url":null,"abstract":"<div><div>In this work, a simple and modified method for immobilizing Pd(0) NPs on the surface of dual functionalized magnetic Fe<sub>3</sub>O<sub>4</sub> microspheres with chitosan-agarose (CS-Agar) has been used. The high area surface showed a dispersion of the minuscule Pd NPs. The key role of the CS-Agar hydrogel is to reduce Pd ions via a green pathway, stabilizing them via capping in the process. In order to determine the morphological aspects of the synthesized material, it was subjected to a variety of physicochemical techniques, including FE-SEM (Field Emission Scanning Electron Microscopy) and TEM (Transmission Electron Microscopy). The new material was studied catalytically as a reusable heterogeneous nanocatalyst that is effective in phosphine-free production of a variety of stilbene derivatives using the Sonogashira coupling method. Excellent results were obtained in every reaction, with the exception of chloroarenes and sterically hindered substrates. Without seeing a discernible decline in activity, the catalyst was reused seven times in a row.</div></div>","PeriodicalId":374,"journal":{"name":"Journal of Organometallic Chemistry","volume":"1029 ","pages":"Article 123553"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143268005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Recent progress in palladium-catalyzed reduction with organosilanes

IF 2.1 3区化学

Journal of Organometallic Chemistry Pub Date : 2025-02-01 DOI: 10.1016/j.jorganchem.2024.123484

Maryam Mirza-Aghayan , Amir Sepehr Moieni

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Biosynthesis of Mikania micrantha mediated silver nanoparticles: Its application as a sustainable catalyst for Biginelli reaction and antioxidant capacity

IF 2.1 3区化学

Journal of Organometallic Chemistry Pub Date : 2025-02-01 DOI: 10.1016/j.jorganchem.2024.123482

Manthae C. Phom , Betokali K. Zhimomi , Putusenla Imchen , Phitovili Sumi , Shisak Sharma , Khonzani Yanthan , Shokip Tumtin , Toka Swu , Tovishe Phucho

{"title":"Biosynthesis of Mikania micrantha mediated silver nanoparticles: Its application as a sustainable catalyst for Biginelli reaction and antioxidant capacity","authors":"Manthae C. Phom , Betokali K. Zhimomi , Putusenla Imchen , Phitovili Sumi , Shisak Sharma , Khonzani Yanthan , Shokip Tumtin , Toka Swu , Tovishe Phucho","doi":"10.1016/j.jorganchem.2024.123482","DOIUrl":"10.1016/j.jorganchem.2024.123482","url":null,"abstract":"<div><div>The current study focuses on the eco-friendly, bio-synthesis and of silver nanoparticles (AgNPs), utilizing an aqueous extract of <em>Mikania micrantha</em>. A rigorous analysis was performed to investigate the effects of several operational factors on the synthesis of AgNPs, including the various quantities of leaf extract, temperature, contact duration, and pH solution. The outcomes demonstrated that the optimal circumstances for producing nanoparticles are <em>Mikania micrantha</em> leaf extract dosage (5 % v/v), pH 9, and 80 °C temperature, with a duration of 60 min incubation time. The bio-synthesized AgNPs were examined using UV–Vis, FT-IR, X-ray diffraction (XRD), FE-SEM, EDX, TEM, and SAED studies. The FT-IR study proved that phytochemicals were involved in the AgNPs production process, and its spherical morphologies with the size range of 12.35 - 46.83 nm were apparent in the TEM images. The face-centered cubic structure of AgNPs was validated by the XRD spectrum. The XRD investigations also substantiated the SAED spectrum's indication that the AgNPs were crystalline. AgNPs were identified as an eco-friendly heterogeneous catalyst, demonstrating high catalytic efficiency in the Biginelli reaction under acid-free, mild conditions, achieving excellent yields in 30 s. 1,1-diphenyl- 2-picrylhydrazyl (DPPH) and Ferric reducing antioxidant power (FRAP) assays were used to assess the biological efficiency showing 89.8 % inhibition activity with an average IC<sub>50</sub> value of 24.99± 0.19 µg mL<sup>-1</sup> and higher reducing power than the positive control, respectively. This confirms that the leaf extract of <em>Mikania micrantha</em> and its biosynthesized nanoparticles also showed promising antioxidant capability.</div></div>","PeriodicalId":374,"journal":{"name":"Journal of Organometallic Chemistry","volume":"1025 ","pages":"Article 123482"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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New Si-containing heterocycles on the base of fenamic acid

IF 2.1 3区化学

Journal of Organometallic Chemistry Pub Date : 2025-02-01 DOI: 10.1016/j.jorganchem.2024.123468

Anastasiya S. Soldatenko , Alexander I. Albanov , Alexander A. Korlyukov , Alexander D. Volodin , Nataliya F. Lazareva

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Construction of multiply arylated fused heterocycles through rhodium-catalyzed double annulation of acylamido arenes with alkynes

IF 2.1 3区化学

Journal of Organometallic Chemistry Pub Date : 2025-02-01 DOI: 10.1016/j.jorganchem.2025.123550

Mikishiro Hayashi, Yoshinosuke Usuki, Tetsuya Satoh

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Preparation and characterization of Pd immobilized on the MIL-125-NH2 as an efficient recyclable metal-organic framework in the Suzuki–Miyaura reaction

IF 2.1 3区化学

Journal of Organometallic Chemistry Pub Date : 2025-02-01 DOI: 10.1016/j.jorganchem.2024.123466

Zeynab Sadati, Heshmatollah Alinezhad, Mahmood Tajbakhsh

{"title":"Preparation and characterization of Pd immobilized on the MIL-125-NH2 as an efficient recyclable metal-organic framework in the Suzuki–Miyaura reaction","authors":"Zeynab Sadati, Heshmatollah Alinezhad, Mahmood Tajbakhsh","doi":"10.1016/j.jorganchem.2024.123466","DOIUrl":"10.1016/j.jorganchem.2024.123466","url":null,"abstract":"<div><div>In this study, an efficient heterogeneous palladium was developed by moifying the MIL-125-NH<sub>2</sub> metal-organic framework bromoacetyl bromide and tetraethylenepentamine ligands. The resulting modified framework was then used as a platform for immobilizing Pd nanoparticles (NPs) to generate the Pd@MIL-125-NH-Ac-TEPA nanocomposite. FT-IR, FESEM, EDS, TEM, CHN, TGA, XRD, and ICP-OES were used to identify the structure of the nanocomposite. The characterization findings approve the formation of well-dispersed Pd nanoparticles with a size distribution of 9 to 23 nm. The Pd@MIL-125-NH-Ac-TEPA nanocomposite with 2.97 % loading of Pd exhibited high efficiency in the Suzuki-Miyaura coupling reaction of arylboronic acids with various aryl and heteroaryl halides (chlorides, bromides, and iodides) containing electron-donor and electron-acceptor substituents. The coupling products were obtained in water/ethanol mixture (1:1) as solvent at 60 °C for 30 min in 70–99 % yields. The nanocatalyst can be recovered easily and reused for at least five consecutive runs without losing its activity significantly. The palladium leaching of the reused nanocatalyst was less than 1 %. The results revealed that the introduced nanocatalyst has the potential for other organic transformations.</div></div>","PeriodicalId":374,"journal":{"name":"Journal of Organometallic Chemistry","volume":"1025 ","pages":"Article 123466"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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