Metal complexes of biologically important ligands, CVI. Metal complexes of donor substituted oxazolones and of bis(oxazolones) [German]

摘要

A series of chelate complexes 1-12 of Cu(II), Ni(II), Pd(II), and Ru(III) with the anion of 2-(2'-hydroxyphenyl)-5 (4H)-oxazolone and with 2-(2'-aminophenyl)-5(4H)-oxazolone were prepared from metal salts or from chloro-bridged complexes [(R3P)MCl2](2) (M = Pd, Pt) and [(p-cymene)RuCl2](2). Nucleophilic addition of alpha-amino acid esters to the bis-chelate complexes M(oxophenyloxazolone)(2) (M = Ni, Cu) gave the dipeptide derivatives 13-18. Dinuclear Pd(II) and Pt(II) chelate complexes 19-23 were obtained from phenylene- and ethylene-bridged bis(oxazolones). The structures of (Et3P)(Cl)Pd(O,N-oxophenyloxazolone) (6) and of Cl-2(Et3P)Pt(2,2'-phenylene-bis(4-methyloxazolone)Pt(PEt3)Cl-2 (20) were determined by X-ray diffraction. In complex 20 a close proximity of two phenylene H atoms to the metal is observed. [References: 28]