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The thermally induced racemisation of methyl (4R,6R)-9,9-dimethyl-7-oxo-8-oxa-4-thia-1-azabicyclo-[4,3,0]non-2-ene-3-carboxylate 4-oxide (5) probably involves the intermediacy of the sulphenic acid (9), which is formed by a sigmatropic hydrogen shift.
A. G. W. Baxter, J. Kitchin, R. J. Stoodley and R. B. Wilkins, J. Chem. Soc., Chem. Commun., 1973, 285 DOI: 10.1039/C39730000285
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