Journal
CHEMICAL COMMUNICATIONS
Volume 57, Issue 32, Pages 3836-3856Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cc08149c
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Funding
- BOF research and starting grants
- UGent IoF
- Research Foundation - Flanders (FWO) [11I6921N]
- iBOF grant C3
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The emerging synthetic method for N-heterocyclic carbenes utilizing weak bases and ideal solvents has proven to be a cost-effective and simple pathway. Mechanistic investigations show the formation of stable intermediates before metallation. The method shows great promise for a wide range of applications.
N-Heterocyclic carbenes (NHCs) are nowadays ubiquitous in organometallic chemistry and catalysis. Recently, a synthetic method which makes use of weak bases and desirable solvents has emerged as a simple, widely applicable and cost-effective pathway to well defined M-NHC complexes. Herein, recent studies devoted to the weak base approach are examined in detail, in order to showcase the simplicity, scope and variations of the method with regards to the azolium salts, bases and the metal sources, as well as the reaction conditions used. Mechanistic investigations are presented, illustrating the formation of intermediates which are air and moisture stable, prior to the metallation step. Finally, the importance, limitations and future prospects of the weak base route are discussed.
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