COPPER-(II) COMPLEXES WITH ETHERS OF TYROSINE AND GAMMA-ESTERS OF GLUTAMIC-ACID

The synthesis of five long-chain (C-8 to C-12) alkyl ethers of S-(-)-t yrosine and of five long-chain (C-8 to C-12) alkyl esters of S-(+)-glu tamic acid is described. Among these ligands, only n-octyl tyrosine an d n-decyl tyrosine have been reported previously. Ten new Cu(II) compl exes of these novel tyrosine and glutamic acid derivatives were synthe sized. Spectroscopic evidence suggests that these square-planar comple xes adopt a trans-configuration and shows that the ligands are bidenta te. Bonding occurs via the oxygen atoms of the carboxylate groups and the nitrogen atoms of the amino groups.