The synthesis of chiral N-heterocyclic carbene–borane and –diorganoborane complexes and their use in the asymmetric reduction of ketones
作者:David M. Lindsay、David McArthur
DOI:10.1039/c001466d
日期:——
Chiral N-heterocyclic carbene-borane complexes have been synthesised, and have been shown to reduce ketones with Lewis acid promotion. Chiral N-heterocyclic carbene-borane and -diorganoborane complexes can reduce ketones with enantioselectivities up to 75% and 85% ee, respectively.
A dialkylborenium ion via reaction of N-heterocyclic carbene–organoboranes with Brønsted acids—synthesis and DOSY NMR studies
作者:David McArthur、Craig P. Butts、David M. Lindsay
DOI:10.1039/c1cc10767d
日期:——
A dialkylborenium ion stabilized by an N-heterocyclic carbene has been prepared for the first time by reaction of IMes·9-BBN-H with triflic acid. The ion-separated nature of the borenium ion was confirmed by 1H and 19F diffusion ordered NMR spectroscopy.