The ability of chiral anions, for example bis [1, 1′-bi-2-naphtholato] borate, to induce asymmetry in the reactions of prochiral cations was investigated. Ion-pairing of a borate anion with an aziridinium ion was demonstrated by NMR spectroscopy. The addition of N- methyl indole to an iminium ion (benzylidenedimethylammonium) and the ring-opening of an aziridinium ion (1, 2-diphenyl-3-azonia-spiro [2.4] heptane) with benzylamine were ...
