Alloxazinium-Resins as Readily Available and Reusable Oxidation Catalysts

N5-Modified alloxazinium salts including 5-ethyl-1,3-dimethylalloxazinium and 5-ethyl-1,3-dimethyl-8-(trifluoromethyl)alloxazinium salts were readily prepared as alloxazinium-resinsfrom the corresponding N5-unmodified ingredients via the aerobic oxidation—ion exchange protocol, previously introduced by us for the preparation of isoalloxazine analogues, and their catalysis and reusability in H2O2oxidations were evaluated.N5-Modified alloxazinium salts including 5-ethyl-1,3-dimethylalloxazinium and 5-ethyl-1,3-dimethyl-8-(trifluoromethyl)alloxazinium salts were successfully prepared as alloxazinium-resinsvia the aerobic oxidation—ion exchange protocol and demonstrated to be efficient and reusable organocatalysts for H2O2-mediated oxidations.