Synthesis of η4:π2-Exocyclic-Diene Iridium(I) Complexes Derived from 1,3-Oxazolidin-2-ones and Their Transformation into Iridium(III) Derivatives by Reaction with a Phosphine and with Aldehydes

Abstract

The reaction of the dimer [Ir(μ-Cl)(coe) 2 ] 2 with two exocyclic dienes like N-substituted 4,5-dimethylene-2-oxazolidinones a and b, and KTp Me2 yields derivatives of the composition Tp Me2 Ir( a or b) (1a,b). Derivative la reacts with Ph 2 PC≡CPPh 2 , with the formal oxidative addition of the diene moiety to the metal center and coordination of the phosphine in the k 1 mode. Derivatives 1a,b react with aromatic aldehydes to form the new compounds 3 (with benzaldehyde) and 4 (anisaldehyde), which contain an elaborated bidentate ligand formed by coupling of the two organic fragments (diene and aldehyde). The structures of compounds 3a,b have been determined by X-ray diffraction analysis.