Oxidation of the penem derivative (1a,b) by m-chloroperbenzoic acid occurs by the direction of the β-lactam carbonyl oxygen to give β-sulphoxide (2a,b) as a major product, whose structure has been determined by X-ray crystallography.
R. Tanaka, Y. Oyama and M. Ishiguro, J. Chem. Soc., Chem. Commun., 1990, 853 DOI: 10.1039/C39900000853
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