Enantioselective hydride abstraction in organic substrate: A novel use forchiral carbenium ions

It is surprising that chiral cations have not been used to distinguish betw een prochiral hydrides when converse notions, such as asymmetric addition o f a hyride to a prochiral functional group or use of a chiral anion to dist inghish between a pair of prochiral protons, are methods employed everyday in enantioselective synthesis. To the best of our knowledge, this Letter de scribes the first example ol an oxidative enantioselective hydride transfer process.