Synthesis and Lewis acid properties of a ferrocene-based planar-chiral borenium cation
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. The Royal Society of Chemistry.
Chen, Jiawei,Lalancette, Roger A.,Jaekle, Frieder
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p. 4893 - 4895
(2013/07/05)
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