2-(Arylthio)benzohydroxamic acids 1 and 2 undergo photodeoxygenation under unsensitised irradiations.DCA sensitized irradiation of a model benzohydroxamic acid (5), however, yields 1,2-diacyldiazine (6).
Photochemical reactions of hydroxamic acids have been studied.The intermediacy of a RCONH(.) radical is postulated, based on oxidations achieved with DCA under photochemical conditions.