S,S-Acetals are smoothly deprotected with air in the presence of a catalytic amount of bismuth (III) nitrate pentahydrate under ambient conditions to regenerate the original carbonyl compounds in good to excellent yields.
N. Komatsu, A. Taniguchi, M. Uda and H. Suzuki, Chem. Commun., 1996, 1847 DOI: 10.1039/CC9960001847
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