Palladium(II) complexes with R2edda derived ligands. Part I. Reaction of diisopropyl (S,S)-2,2'-(1,2-ethanediyldiimino)-dipropanoate with K2[PdCl4]

Abstract

The reaction of K2[PdCl4] with (S,S)-(i-Pr)2eddip diester (diiso-propyl (S,S)-2,2’-(1,2-ethanediyldiimino)dipropanoate) resulted in {PdCl2[(S,S)-(i-Pr)2eddip-κ2N,N’]} (1) and {PdCl[(S,S)-(i-Pr)eddip-κ2N,N’,κO]} (2) with one hydrolyzed ester group. The compounds were characterized by spectroscopic methods and it was proved that the reaction is diastereoselective (1H- and 13C-NMR) in the case of 2 (one diastereoisomer of four possible). The structure of 2 was determined by X-ray diffraction analysis, indicating that the product is the (R,R)-N,N’ configured isomer. In contrast, the reaction yielding 1 produced two of three possible diastereoisomers. DFT calculations support the formation of two diastereoisomers of 1 and of one diastereoisomer of 2.

Keywords

• palladium complexes
• crystal structure
• EDDP ligands
• DFT calculations