Charge-induced facial-selectivity in the formation of new cationic planar chiral iridacycles derived from aniline

摘要

The reaction of chiral chlorido-iridacyclic 2-(4-N,N-diinethyl-aminophenyl)pyridines with solvato-type [Cp*M(S)_3]~(q+) (M = Ru, S = MeCN, q = 1; M = Ir, S = MeC(O)Me, q = 2) complexes produces new cationic racemic planar chiral iridacycles in an efficient and diastereospeciflc way. In spite of the growing interest' in the use of planar chiral metallacycles2 as catalysts, the majority of reports deal exclusively with complexes of square-planar (SPA) Pd or Pt centres.3'4 By expanding the variety of coordination geometries at the chelated metal centre to octahedral (OC-6) and pseudo-tetrahedral (T-4) one would not only open up new horizons but also introduce the major issues of stereospecificity and conforma-tional instability at the stereogenic centres.