Cu (acac) z, involves the paramagnetic interaction of the triplet excited state of aryl ketones with the complex. It has been proposed that this occurs by a mixture of charge-transfer and spinexchange processes leading to the intermediacy of the acetylacetonyl This radical has also been implicated in the oxidation of acetyla~ etone~~ with metal ions; for example, manganese (II1) acetate in acetic acid. 3 As the generation of a prima facie acetylacetonyl ...