The reaction of substituted benzothiazine sulphoxides with Ac2O under reflux leads by an elimination reaction to a sulphenic acid derivative which undergoes subsequent addition to the generated double bond if the nitrogen is tertiary but is trapped as a cyclic sulphenamide by a secondary nitrogen.
R. B. Morin and D. O. Spry, J. Chem. Soc. D, 1970, 335 DOI: 10.1039/C29700000335
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