NOBF4 underbasic or even almost neutral reaction conditions. Acid-sensitive functional groups are tolerated under the developed basicconditions. For the substrates having poor reactivity, almost neutralconditions (using pyridine equimolar to NOBF4) are suitable for better yields. Furoxans (1,2,5-oxadiazole 2-oxides) can be synthesized from the corresponding styrenes using NOBF4 underbasic or even