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Salen Ligands Revisited: Synthesis and Application of a Planar Chiral “Ferro‐Salen” Ligand

Condensation of the O-protected planar chiral hydroxyferrocene carbaldehyde (S p )-1 with ethylenediamine, followed by deprotection gave rise to the "ferro-salen" ligand (S p ,S p )-3 in good yield. This scaffold was used for the preparation of a series of metal complexes [(S p ,S p )-4/5/6], which were subsequently applied for the Lewis acid catalyzed asymmetric trimethylsilylcyanation of benzaldehyde.