The air stable NHC IPrBr is reported. A stereoelectronic study of IPrBr and its similarly stable relative IMesBr demonstrates metal complex specific changes in NHC donicity versus the ubiquitous IPr and IMes. Application to a Suzuki coupling and an iridium transfer hydrogenation gives superior outcomes using IPrBr and IMesBr.
S. K. Furfari, M. R. Gyton, D. Twycross and M. L. Cole, Chem. Commun., 2015, 51, 74 DOI: 10.1039/C4CC06809B
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