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N-Heterocyclic Carbene Deposition on a Copper Powder Surface Using Mechanochemistry.
ACS Appl Mater Interfaces
January 2025
Department of Chemistry, McGill University, Montréal, Québec H3A 0G4, Canada.
Metal powders are crucial precursors for manufacturing surfaces through thermal spraying, cold spraying, and 3D printing methods. However, surface oxidation of these precursors poses a challenge to the coherence of the metallic materials during manufacturing processes. Herein, we introduce a method for surface modification of copper powder with N-heterocyclic carbenes (NHCs) using mechanochemistry to mitigate surface oxidation.
View Article and Find Full Text PDFCationic Polyhedral Chalcogenaboranes: Activation without breaking Wade's Rules.
Angew Chem Int Ed Engl
January 2025
University Pardubice Faculty of Chemical Technology: Univerzita Pardubice Fakulta Chemicko-Technologicka, Department of General and Inorganic Chemistry, CZECHIA.
Wade's rules are a well-established tool for the description of the geometry of inorganic clusters. Among others, they state that a decrease or increase in charge is always accompanied by a change in the number of skeletal electron pairs (SEPs). This work reports the synthesis of the first cationic chalcogenaboranes closo-[12-X-2-IPr-1-EB11H10]BF4 (X = H, I; E = S, Se 3a/b, 4a/b) featuring the same SEP count as their neutral precursors, EB11H11, but bearing a positive charge.
View Article and Find Full Text PDFImproving the Long-term Enantioselectivity of a Silicon-Carbon Bond-Forming Enzyme.
Chemistry
January 2025
Karlsruhe Institute of Technology, Institute for biological interfaces 1 (IBG-1), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, GERMANY.
Enantioselectivity is a key advantage of enzymatic catalysis. Understanding the most important factors influencing enantioselectivity necessitates thorough investigation for each specific enzyme. In this study, we explore various approaches to optimize reaction conditions for organosilicon production using an immobilized Cytochrome C recently tailored via directed evolution.
View Article and Find Full Text PDFNucleophilicity at copper(-I) in a compound with a Cu-Mg bond.
Nat Commun
January 2025
Department of Chemistry, University of Bath, Bath, BA2 7AY, UK.
Copper is ubiquitous as a structural material, and as a reagent in (bio)chemical transformations. A vast number of chemical reactions rely on the near-inevitable preference of copper for positive oxidation states to make useful compounds. Here we show this electronic paradigm can be subverted in a stable compound with a copper-magnesium bond, which conforms to the formal oxidation state of Cu(-I).
View Article and Find Full Text PDFCu(II)-NHC Catalyzed Insertion of Quinoid Carbenes into -Epoxides: Stereoselective Synthesis of -Dihydronaphthodioxine.
Org Lett
January 2025
Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
A straightforward synthesis of -dihydronaphthodioxine has been efficiently accomplished through Cu(II)-NHC catalysis, involving the stereoselective ring opening of -epoxides with quinoid-carbene. Intramolecular S2-like substitution facilitates the inversion of stereochemistry during -epoxide ring opening. This reaction has been developed under simple conditions, demonstrating a broad substrate scope with a wide chemoselective profile.
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