Quantifying and understanding the electronic properties of N-heterocyclic carbenes

David James Nelson, Steven Patrick Nolan

Research output: Contribution to journalArticlepeer-review

680 Citations (Scopus)


The use of N-heterocyclic carbenes (NHCs) in chemistry has developed rapidly over the past twenty years. These interesting compounds are predominantly employed in organometallic chemistry as ligands for various metal centres, and as organocatalysts able to mediate an exciting range of reactions. However,
the sheer number of NHCs known in the literature can make the appropriate choice of NHC for a given application difficult. A number of metrics have been explored that allow the electronic properties of NHCs to be quantified and compared. In this review, we discuss these various metrics and what they can teach about the electronic properties of NHCs. Data for approximately three hundred NHCs are
presented, obtained from a detailed survey of the literature.
Original languageEnglish
Pages (from-to)6723-6753
Number of pages31
JournalChemical Society Reviews
Early online date20 Jun 2013
Publication statusPublished - 2013


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