A WAY TO OBTAIN CYCLOPALLADATION OF UNSUBSTITUTED 2-PHENYLIMIDAZOLE DERIVATIVES

This work shows the difficulties of obtaining cyclopalladated complexe s with 2-phenylimidazole and 2-phenylbenzimidazole as ligands. The pro tection of the NH group in the heterocycle with an acetyl group allows the formation of several cyclopalladated complexes of both ligands. T he X-ray structure of the dimeric acetate-bridge complex of N-acetyl-2 -phenyl-benzimidazole is described. The subsequent displacement of the protective group affords a monomeric cyclopalladated complex of 2-phe nylbenzimidazole, as well as a coordination complex of this ligand.