A novel isopentatungstate-supported metal carbonyl derivative KH[(CH3)4N]3{[Re(CO)3]4[(μ2-OH)(μ3-O)(W5O18)]}·6H2O () has been synthesized and characterized. Compound represents the second example of isopolyoxotungstate-supported metal carbonyl derivative. The catalysis of for alkene epoxidation with H2O2 was investigated, and was found to efficiently catalyze the epoxidation of cyclooctene with high conversion (98.9%) and excellent selectivity (99%). Furthermore, the solution behavior of the polyanion was also explored using electrospray ionization mass spectrometry.
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http://dx.doi.org/10.1039/c6dt00352d | DOI Listing |
J Am Chem Soc
December 2024
Henan Key Laboratory of Crystalline Molecular Functional Materials, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
The conversion of methane and carbon dioxide to form C products is of great interest but presents a long-standing grand challenge due to the significant obstacle of activating the inert C-H and C═O bonds as well as forming the C-C bonds. Herein, the consecutive C-C coupling of CH and CO was realized by using heteronuclear metal cations CuTa, and the desorption of HC═C═O molecules was evidenced by state-of-the-art mass spectrometry. The CuTa reaction system is significantly different from the homonuclear metal systems of Cu and Ta.
View Article and Find Full Text PDFJ Am Chem Soc
December 2024
Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.
Hydroalkylation of terminal alkynes is a powerful approach to the synthesis of disubstituted alkenes. However, its application is largely unexplored in the synthesis of α,β-unsaturated carbonyls, which are common among synthetic intermediates and biologically active molecules. The thermodynamically less stable -isomers of activated alkenes have been particularly challenging to access because of their propensity for isomerization and the paucity of reliable -selective hydroalkylation methods.
View Article and Find Full Text PDFJ Colloid Interface Sci
December 2024
Institute of Corrosion Science and Technology, Guangzhou 510530, China.
With the development of science and technology, there is a great demand for electromagnetic wave absorbing materials for both military and civilian purposes. Among them, carbonyl iron powder (CIP) has attracted a lot of attention due to its mature production system and good electromagnetic wave loss capability. However, the application of CIP is limited due to poor impedance matching, poor corrosion resistance, and poor oxidation resistance.
View Article and Find Full Text PDFLangmuir
December 2024
School of Materials, Sun Yat-sen University, Shenzhen 518107, China.
Hydrogen sulfide (HS), carbonyl sulfide (COS), and dimethyl sulfide (DMS) are the primary sulfur compounds found in seawater, which cause pitting corrosion on the oxide passivation film of titanium, known as "the marine metals". In this study, density functional theory (DFT) was used to analyze the adsorption and surface electronic properties of these three small molecules on the anatase TiO(101) surface. The analysis was conducted through adsorption energy, work function, Mulliken charge population, and density of states (DOS).
View Article and Find Full Text PDFChem Asian J
December 2024
Govt. Degree College for Men, Srikakulam, Department of Chemistry, Srikakulam, 532001, Srikakulam, INDIA.
The production of enantiomerically pure compounds remains a vital and valuable objective in modern organic chemistry due to their broad applications in fields such as biosensing, optics, electronics, photonics, catalysis, nanotechnology, and drug or DNA delivery. Optically pure α-hydroxy ketones, in particular, are key structural components in many drugs and natural products with significant biological activity. Among these, benzoin type α-hydroxy ketones, which possess two adjacent functional groups, a carbonyl and a hydroxy group, are especially important.
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