Abstract Efficient photocatalytic aerobic oxidative dehydrogenation reactions of N,N-disubstituted hydroxylamines to nitrones were developed with an in situ generated photocatalyst based on commercially available 3,6-dichlorotetrazine. This process affords a wide range high yields under mild conditions. In addition, (3+3) cycloaddition between oxyallyl cation precursor and hydroxylamine was als...