Synthesis and Lewis acid properties of a ferrocene-based planar-chiral borenium cation
作者:Jiawei Chen、Roger A. Lalancette、Frieder Jäkle
DOI:10.1039/c3cc41556b
日期:——
The first planar chiral ferrocenylborenium species (pR)-3+ is obtained in the enantiopure form by halide abstraction from the corresponding chloroborane adduct (pR)-2 using Krossing's salt. Competition experiments suggest that the Lewis acidity of (pR)-3+ is higher than that of B(C6F5)3 towards anions and slightly lower towards neutral Lewis bases. The ferrocenylborenium species (pR)-3+ is examined as a catalyst for the stereoselective hydrosilylation of ketones.