Abstract
The Baeyer-Villiger oxidation of cyclopentanone to δ-valerolactone by a peroxomolybdenum complex, MoO(O) 2 (dipic), under catalytic (hydrogen peroxide) conditions was reported in the literature some years ago. Such a reaction might have both synthetic and mechanistic significance, being the only available example of nucleophilic reactivity of Group VI peroxometal complexes. However, the results of a reinvestigation of the reaction presented in this paper indicate that the oxidation is carried out by hydrogen peroxide and that the role of MoO(O) 2 (dipic) as well that of other molybdenum derivatives is simply to catalyze the reaction owing to their strong acid nature.
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