Portal de Periódicos da CAPES

Synthesis and stereochemistry of diene-ruthenium(II) complexes of sulphur-containing α-amino acids

1990; Elsevier BV; Volume: 386; Issue: 3 Linguagem: Inglês

10.1016/0022-328x(90)80009-o

1872-8561

William S. Sheldrick, Reiner Exner,

Metal-Catalyzed Oxygenation Mechanisms

Diene-ruthenium(II) complexes of the sulphur-containing amino acids d,l-methionine (d,l-metH), d,l-penicillamine (d,l-penH) and d,l-cysteine (d,l-cysH) and of d,l-methionine methyl ester (d,l-metme) have been prepared by their reaction of the amino acids or esters with [(diene)RuCl2]n (diene = norbornadiene (nbd), 1,5-cyclooctadiene (cod)) in methanol at reflux. Crystal structures are reported for [(nbd)Ru(d,l-metme)Cl2] (1), [(nbd)Ru(d,l-met)Cl]·CH3OH (2) and [(nbd)Ru(d,l-penH−1)]2·EtOH·HCl (3), in which the amino acid ligands are respectively bi-, tri- and tetra-dentate, with S,N-, S,N,O- and S,S,N,O-coordination. Spectroscopic evidence suggests that, in contrast to 3, the d,l-cysteinate ligands are tridentate (S,S,N-coordination) in dimeric [(cod)Ru(d,l-cys)Cl]2 (4).