Palladium(II) acetate is readily converted into [Pd3(μ2-OH)(OAc)5] (1) in the presence of water in a range of organic solvents and is also slowly converted in the solid state. Complex 1 can also be formed in nominally anhydrous solvents. Similarly, the analogous alkoxide complexes [Pd3(μ2-OR)(OAc)5] (3) are easily formed in solutions of palladium(II) acetate containing a range of alcohols. An examination of a representative Wacker-type oxidation shows that the Pd-OH complex 1 and a related Pd-oxo complex 4 can be excluded as potential catalytic intermediates in the absence of exogenous water.
Bedford, R. B., Bowen, J. G., Davidson, R. B., Haddow, M. F., Seymour-Julen, A. E., Sparkes, H. A., & Webster, R. L. (2015). Facile hydrolysis and alcoholysis of palladium acetate. Angewandte Chemie-International Edition, 54(22), 6591-6594. https://doi.org/10.1002/anie.201500620