Two electrochemical oxidation waves assigned to the D(5h) isomer of Sc(3)N@C(80) have been identified, and a 270-mV difference in the first electrochemical oxidation potentials of the I(h) and D(5h) isomers has been measured. On the basis of this oxidative potential difference, a strategy for isomeric purification involving a selective chemical oxidation of the D(5h) isomer is reported. Variable scan cyclic voltammetry of the resultingly pure Sc(3)N@C(80) I(h) isomer shows evidence of a rapid endohedral chemical reaction following the first reduction process.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/ja052446r | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Unlocking the Key to Photocatalytic Hydrogen Production Using Electronic Mediators for Z-Scheme Water Splitting.
J Am Chem Soc
January 2025
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China.
A prevalent challenge in particulate photocatalytic water splitting lies in the fact that while numerous photocatalysts exhibit outstanding hydrogen evolution reaction (HER) activity in organic sacrificial reagents, their performance diminishes markedly in a Z-scheme water splitting system using electronic mediators. This underlying reason remains undefined, posing a long-standing issue in photocatalytic water splitting. Herein, we unveiled that the primary reason for the decreased HER activity in electronic mediators is due to the strong adsorption of shuttle ions on cocatalyst surfaces, which inhibits the initial proton reduction and results in a severe backward reaction of the oxidized shuttle ions.
View Article and Find Full Text PDFGold(I)-Catalyzed [2 + 2] and [3 + 2] Cycloadditions of 1,1-Difluoroallenes with Aldehydes: Switchable Syntheses of Fluorinated Oxetanes and Furans.
Org Lett
January 2025
Division of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.
1,1-Difluoroallenes underwent regioselective [2 + 2] and [3 + 2] cycloadditions with aldehydes using Au(I) catalysts. An AuCl catalyst enabled an α,β-selective [2 + 2] cycloaddition of 1,1-difluoroallenes, yielding ()-3-alkylidene-2,2-difluorooxetanes. Conversely, an AuCl(IPr)-AgSbF catalyst facilitated an α,γ-selective [3 + 2] cycloaddition, followed by dehydrofluorination to produce aromatized 2-fluorofurans.
View Article and Find Full Text PDFElectrochemical Ammonia Synthesis at -Block Active Sites Using Various Nitrogen Sources: Theoretical Insights.
J Phys Chem Lett
January 2025
School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
Electrochemical nitrogen conversion for ammonia (NH) synthesis, driven by renewable electricity, offers a sustainable alternative to the traditional Haber-Bosch process. However, this conversion process remains limited by a low Faradaic efficiency (FE) and NH yield. Although transition metals have been widely studied as catalysts for NH synthesis through effective electron donation/back-donation mechanisms, there are challenges in electrochemical environments, including competitive hydrogen evolution reaction (HER) and catalyst stability issues.
View Article and Find Full Text PDFIsolation of Antiplasmodial Oxazoles and Isoflavonoids from the Roots of and Total Synthesis of Oxazole-type Alkaloids.
J Nat Prod
January 2025
Department of Chemical and Biological engineering, School of Engineering and Technology, National University of Mongolia, Ulaanbaatar 14201, Mongolia.
A chemical examination of a root extract of led to the isolation and identification of 23 compounds, including oxazole-type alkaloids and isoflavonoid derivatives. Notably, three oxazole-type alkaloids (, , and ) and two isoflavonoid derivatives ( and ) were obtained from a natural source for the first time. In addition, derived 2,5-diphenyloxazoles and their derivatives were synthesized.
View Article and Find Full Text PDFPhotoredox-Enabled Direct and Three-Component Difluoroalkylative Modification of -Aryl Glycinates.
Org Lett
January 2025
Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, China.
A Cu(I) photoredox-enabled reaction that selectively incorporates a difluoroalkyl group into -aryl glycine derivatives has been established. Using a bench-stable [PhPCFH]Br salt, the -CFH group could be installed either directly on the α-carbon of the glycine backbone or in a three-component fashion using an alkene as a bridge. A series of glycine derivatives have been evaluated, providing access to diverse unnatural amino esters and dipeptides with a -CHF unit.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!