The manganese triacetate oxidation of hindered α1-positions in a model enone, 3β, 3aβ, 6-trimethyl-3a, 7aβ-dihydro-2(3H), 5(4H)-benzofurandione, provided a procedure for the introduction of the α′-hydroxyenone functionality characteristic of the A ring of certain quassinoids.
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Jeganathan et al. (1989) studied this question.