Elsevier, Journal of Organometallic Chemistry, 1-2(663), p. 277-283, 2002
DOI: 10.1016/s0022-328x(02)01928-9
Full text: Download
The action of palladium acetate on the Schiff bases 4-ClC6H4CHN-CH(R2)COOR1 (R1=Me, Et; R2=Ph, CH2Ph), in acetic acid for 3 h at 70°C and subsequent treatment of the reaction residues with LiCl in acetone, affords the corresponding chloro-bridged five-membered endo-metallacycles [PdCl(CN)]2, 1a, 2a. The action of palladium acetate on the Schiff bases 2,6-Cl2C6H3CHNCH(R2)COOR1 (R1=Me, Et; R2=Ph, CH2Ph), in chloroform at room temperature and subsequent treatment of the reaction residues with LiCl in acetone, affords the corresponding chloro-bridged five- or six-membered exo-metallacycles, by metallation of the amino acid moiety [PdCl(CN)]2, 3a-exo, 4a-exo. A small amount of the endo-metallacycles was also obtained, probably by oxidative addition of the ortho CCl bond of these imines to Pd(0) formed in situ. Reaction of dimers 1a–4a with PPh3 affords the mononuclear complexes [PdCl(CN)(PPh3)] 1b–4b.