Free radical reactions have become increasingly important in organic synthesis in the last two decades. 1 Compounds containing the quinone group represent an important class of biologically active molecules that are widespread in nature. 2,3 Electrophilic radicals produced from the manganese(III) acetate oxidation of β-dicarbonyl compounds undergo efficient addition to a C-C double bond. 1d,e,4,5 These reactions can be performed intermo-10.

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