PREPARATION OF 2-SUBSTITUTED 8-QUINOLINOLS CONTAINING C-DONOR, N-DONOR, O-DONOR ATOMS AND ITS PDII OR PTII COMPLEXES

2-Substituted 8-quinolinols possesing two- (4) or three- (6) carbon side chains have been prepared from 2-formyl-8-quinolinol. A carbanion, generated on the side chain, serves as the C-donor of the bonding triad. The complexation with Pd(II) or Pt(II) salts in the presence of pyridine, as an external ligand, afforded the desired neutral chelates having M-C sigma-bond as well as the 2:1 ML2 complex, possessing the intact methine proton. In the case of 6c possessing a pendant acetylacetonyl moiety, the H-1 NMR spectrum suggested a predominance of the enol form, and upon complexation, the 2:1 ML2 complex was formed. Since these new ligands have three different hetero donor atoms, a novel palladium complex containing four different (C, N, O, P) coordinating sites, by the use of tri(n-butyl)phosphine as an external ligand, was prepared.