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Bielawski, Christopher W.
Synthetic Materials & Macromolecules
Research Interests
  • Synthetic chemistry, materials science, polymer chemistry, catalysis, carbon-based materials

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Cyclic (Aryl)(Amido)Carbenes: NHCs with Triplet-like Reactivity

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Title
Cyclic (Aryl)(Amido)Carbenes: NHCs with Triplet-like Reactivity
Author
Sultane, Prakash R.Ahumada, GuillermoJanssen-Mueller, DanielBielawski, Christopher W.
Issue Date
2019-11
Publisher
WILEY-V C H VERLAG GMBH
Citation
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.58, no.45, pp.16320 - 16325
Abstract
The synthesis and study of a library of cyclic (aryl)(amido)carbenes (CArAmCs), which represent a class of electrophilic NHCs that feature low calculated singlet-triplet gaps (Delta E-ST=19.9 kcal mol(-1); B3LYP/def2-TZVP) and exhibit reactivity profiles expected from triplet carbenes, are described. The electrophilic properties of the CArAmCs were quantified by analyzing their respective selenium adducts, which exhibited the largest downfield Se-77 NMR chemical shifts (up to 1645 ppm) measured for any NHC derivative known to date, as well as their Ir carbonyl complexes, from which large Tolman electronic parameter (TEP) values (up to 2064 cm(-1)) were ascertained. The CArAmCs were found to engage in reactions that are typically observed with triplet carbenes, including C-H insertions, [2+1] cycloadditions with alkenes as well as alkynes, and spontaneous oxidation upon exposure to oxygen.
URI
https://scholarworks.unist.ac.kr/handle/201301/29054
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201910350
DOI
10.1002/anie.201910350
ISSN
1433-7851
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