Transition‐Metal‐Free TEMPO Catalyzed Aerobic Oxidation of Alcohols to Carbonyls Using an Efficient Br₂ Equivalent under Mild Conditions

Abstract

Abstract An effective transition‐metal‐free catalytic system is developed for aerobic oxidations of alcohols. Using catalytic amount of bromide‐bromate coupling, H 2 SO 4 , and NaNO 2 , together with 2,2,6,6‐tetramethylpiperidine N ‐oxyl radical (TEMPO) in the presence of air, various alcohols could be converted into the corresponding aldehydes or ketones in good to excellent isolated yields under mild conditions.