In this article, triazolylidene-derived N-heterocyclic olefins (trNHOs) are designed using computational quantum tools, and their potential to promote CO sequestration is tested and discussed in detail. The low barrier heights related to the trNHO-mediated process indicate that the tailored compounds are very promising for fast CO sequestration. The systematic analysis of the presence of distinct substitutes at different N positions of the trNHO ring allows us to rationalize their effect on the carboxylation process and reveal the best N-substituted trNHO systems for CO sequestration and improved trNHO carboxylates for faster CO capture/release.
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http://dx.doi.org/10.1021/acsomega.6b00411 | DOI Listing |
J Org Chem
December 2024
School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China.
Although the radical hydroboration of alkenes with N-heterocyclic carbene (NHC) borane is well documented, the radical hydroboration of alkynes, especially terminal alkynes, remains challenging. Herein, a photoredox-catalyzed radical -hydroboration of alkynes with NHC borane has been developed, which provided various alkenyl boron compounds in moderate to good yields. This protocol exhibits a broad substrate scope, as both internal and terminal alkynes were compatible.
View Article and Find Full Text PDFJ Am Chem Soc
December 2024
Laboratory of Asymmetric Catalysis and Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
Asymmetric -heterocyclic carbene (NHC) organocatalysis is a cornerstone of synthetic organic chemistry. The emerging concept of single-electron NHC catalysis broadened the scope of C-C bond-forming reactions, facilitating the synthesis of a variety of attractive racemic compounds. However, the development of effective and selective chiral NHC catalysts for asymmetric radical-mediated reactions has been challenging.
View Article and Find Full Text PDFOrg Lett
October 2024
State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China.
A N-heterocyclic carbene-catalyzed (NHC) three-component reaction involving -aminopyridinium salts, alkenes, and aldehydes for the synthesis of β-amino ketones is described. In this reaction, -aminopyridinium salts and the Breslow intermediate, which is generated from NHC and aldehydes, are utilized to undergo a single-electron transfer process, forming a ketyl radical intermediate and amidyl radicals. Subsequent to the formation of the amidyl radical, it undergoes selective capture by alkenes, followed by radical cross-coupling to yield the desired β-amino ketones.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
September 2024
Institute of Chemistry, Academia Sinica Taipei, Taiwan, ROC.
Inorg Chem
October 2024
Institut für Nanotechnologie (INT) und Karlsruher Nano-Micro-Facility (KNMF), Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
A novel dinuclear silylene cobalt complex [((MeP)Co)(PMe)(CoCl(PMe))(Si(NCHPPh)CH)] () supported by the [PSi(silylene)P] ligand was prepared through the reaction of N-heterocyclic [PSiP] pincer ligand (HSiCl(NCHPPh)CH) with Co(PMe). Complex [((MeP)Co)(Si(NCHPPh)CH)] () was formed through the reaction of complex with MeLi. To the best of our knowledge, complexes and are the first examples of dinuclear silylene cobalt complexes supported by the [PSi(silylene)P] ligand.
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