Chirale Halbsandwich‐Pentamethylcyclopentadienyl‐Rhodium(III)‐ und Iridium(III)‐Komplexe mit Schiff‐Basen aus Salicylaldehyd und α‐Aminosäureestern [1]

Chiral Half‐sandwich Pentamethylcyclopentadienyl Rhodium(III) and Iridium(III) Complexes with Schiff Bases from Salicylaldehyde and α‐Amino Acid Esters [1] A series of diastereoisomeric half‐sandwich complexes with Schiff bases from salicylaldehyde and L‐α‐amino acid esters including chiral metal atoms, [(η 5 ‐C 5 H 5 )(Cl)M(N,O‐Schiff base)], has been obtained from chloro bridged complexes [(η 5 ‐C 5 Me 5 )(Cl)M(μ‐Cl)] 2 (M = Rh, Ir). Abstraction of chloride from these complexes with Ag[BF 4 ] or Ag[SO 3 CF 3 ] affords the highly sensitive compounds [(η 5 ‐C 5 Me 5 )M(N,O‐Schiff base] + X − (M = Rh, Ir; X = BF 4 , CF 3 SO 3 ) to which PPh 3 can be added under formation of [(η 5 ‐C 5 Me 5 )M(PPh 3 )(N,O‐Schiff base)] + X − . The diastereoisomeric ratio of the complexes ( 1 ‐ 7 and 11 ‐ 12 ) has been determined from NMR spectra.