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Radical NHC Catalysis
Abstract
Radical/radical cross-coupling reactions represent an efficient and straightforward approach for the construction of chemical bonds and accordingly have drawn increasing attention over the past decades. In order to achieve synthetically useful transformations, a persistent radical should be coupled with a transient radical in accordance with the persistent radical effect (PRE). However, known transient radicals outnumber by far the known types of free persistent radicals, which limits the widespread application of the PRE, until today. Thus, the development of efficient cross-coupling reactions between transient radicals has been in focus, and meanwhile transition-metal catalysis has been successfully implemented to artificially prolong radical lifetimes, allowing their utilization in formal radical/radical cross-couplings. Complementary research in the field recently uncovered that organocatalytically generated NHC-derived ketyl radicals are a type of catalytically generated free persistent radicals. NHC-catalyzed radical transformations of aldehydes and carboxylic acid derivatives have enabled the disclosure of an ever-increasing number of interesting reactions, which are different from traditional NHC-catalyzed ionic processes, offering otherwise inaccessible activation modes. These discoveries have opened a door to NHC organocatalysis for the manipulation of radical reactions. Due to its obvious potential in synthetic organic chemistry, it is timely to provide a perspective on this emerging field.
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Metadata
- Authors
- Liu, K., Schwenzer, M., & Studer, A.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2022-09-19
- Volume
- 12
- Issue
- 19
- Pages
- 11984-11999
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W4296286003
- Cited by
- 325
- References
- 65
- FWCI
- 24.44
- Type
- journal article
- Language
- en
- Open access
- closed
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