Salicylaldehyde Schiff bases derived from 2-ferrocenyl-2-amino alcohols. Part 2: Stereochemical divergence in the titanium-promoted enantioselective diketene addition to benzaldehyde

Chiral Schiff base ligands derived from salicylaldehydes and from a set of diversely substituted (S)-2-amino-2-ferrocenylethanols show an unprecedented stereodivergence in the titanium-promoted asymmetric addition of diketene to benzaldehyde.