N,O-ligated Pd(II) complexes show considerable promise for the oxidation of challenging secondary aliphatic alcohols. The crystal structures of the highly active complexes containing the 8-hydroxyquinoline-2-carboxylic acid (HCA) and 8-hydroxyquinoline-2-sulfonic acid (HSA) ligands have been obtained. The (HSA)Pd(OAc)2 system can effectively oxidise a range of secondary alcohols, including unactivated alcohols, within 4–6 h using loadings of 0.5 mol%, while lower loadings (0.2 mol%) can be employed with extended reaction times. The influence of reaction conditions on catalyst degradation was also examined in these studies.
Dornan, L. M., Clendenning, G. M. A., Pitak, M. B., Coles, S. J., & Muldoon, M. J. (2014). N,O-Ligated Pd(II) Complexes for Catalytic Alcohol Oxidation. Catalysis, Science & technology, (8), 2526-2534. https://doi.org/10.1039/C4CY00296B