Salen Ligands Revisited: Synthesis and Application of a Planar Chiral "Ferro-Salen" Ligand
- J Niemeyer, G Kehr, R Frohlich, G. Erker
- European Journal of Inorganic Chemistry
A new chiral salen ligand based on two ferrocenyl groups is designed. Unlike known salen ligands, of which chirality originates from central and axial chiral centers, the chirality of this ligand comes from the planar chiral ferrocenyl groups. The ligand is synthesized stereoselectively using a novel aromatization strategy starting from a ferrocene derivative, which was readily prepared using a known chiral auxiliary approach.