title: Synthesis and Lewis acid properties of a ferrocene-based planar-chiral borenium cation.
abstract: 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.
authors.affiliation: Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, NJ, USA.
authors.forename: Jiawei
authors.initials: J
authors.lastname: Chen
authors.forename: Roger A
authors.initials: RA
authors.lastname: Lalancette
authors.forename: Frieder
authors.initials: F
authors.lastname: Jäkle