Photochemical Behaviour of 1,2,5-Oxadiazoles — Irradiation of Some 3-Acylamino-1,2,5-oxadiazoles in the Presence of Nucleophiles

The photochemical behaviour of some 3-acylamino-1,2,5-oxadiazoles (furazans) has been investigated. On irradiation at 254 nm in the presence of nucleophiles (ammonia, primary or secondary amines), the photoreaction produced 3-substituted 1,2,4-oxadiazoles in which the substituent at C(3) arises from the used reagent. Some mechanistic considerations are reported