Syntheses of Ruthenium(II) Complexes with Pentadentate Ligands and Catalytic Oxidation of Alkane Using 2,6-Dichloropyridine N-Oxide

The new ruthenium(II) complexes having pentadentate ligands, [RuCl(N4PY)]Cl and [Ru(N2PY2O) (Me2SO)] were prepared.1,2 Catalytic oxidation of adamantane using MCPBA or 2,6-dichloropyridine N-oxide as cooxidant has been examined. Using N-oxide in the presence of a small amount of MCPBA or Ce(IV) ion (0.5–5 mol% vs substrate) the ruthenium complexes exhibit considerable catalytic activity, and that with the ligand having carboxylate groups is found to be more active.