text: The reaction mechanism for this reaction is not clear and several potential pathways exist. The N-hydroxybenzenesulfonamide 1 or its deprotonated form 2 is a nucleophile in reaction with the aldehyde 3 to intermediate 4. After intramolecular proton exchange to 5 a sulfinic acid anion is split off and hydroxamic acid 8 results through nitroso compound 6 and intermediate 7. Alternatively aziridine intermediate 9 directly forms the end=product. The formation of the nitrene intermediate 10 is ruled out given the lack of reactivity of the chemical mixture towards simple alkenes.