Oxidation of sulfides to sulfoxides with a catalytic amount of ceric ammonium nitrate reagent supported on silica gel has been achieved using stoichiometric sodium bromate as the primary oxidant. The heterogeneous CAN/NaBrO3 reagent enables the use of an organic solvent and simplifies the reaction work-up and product isolation.
M. H. Ali, D. Kriedelbaugh, T. Wencewicz, Synthesis, 2007, 3507-3511.
The use of NaSO2CF3 and NaBrO3 enables a free-radical bromotrifluoromethylation of olefins. Sodium bromate acts not only as a single-electron oxidant but also as a bromine source.
Z.-Q. Liu, D. Liu, J. Org. Chem., 2017, 82, 1649-1656.
Iron photocatalysis enables a mild and efficient intramolecular aromatic C-H oxygenation of 2-biphenylcarboxylic acids to furnish benzocoumarins with a diverse array of substituents in very good yields.
S. Xia, K. Hu, C. Lei, J. Jin, Org. Lett., 2020, 22, 1385-1389.