Palladium(Ⅱ) complexes with R_2edda derived ligands. Part I. Reaction of diisopropyl (S,S)-2,2'-(1,2-ethanediyldiimino)- dipropanoate with K_2[PdCl_4]

摘要

The reaction of K_2[PdCl_4] with (S,S)-(i-Pr)_2eddip diester (diisopropyl (S,S)-2,2'-(1,2-ethanediyldiimino)dipropanoate) resulted in {PdCl_2[(S,S)-(i-Pr)_2eddip-k~2N,N']} (1) and {PdCl[(S,S)-(i-Pr)eddip-k~2N,N',kO]} (2) with one hydrolyzed ester group. The compounds were characterized by spectroscopic methods and it was proved that the reaction is diastereoselective (~1H- and ~(13)C-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.