A catalytic amount of magnesium bromide diethyl etherate (MgBr2 centre dot Et2O) enables us to carry out the aerobic photo-oxidation of a methyl group at the aromatic nucleus to the corresponding carboxylic acid in high yield under irradiation of VIS from a general-purpose fluorescent lamp.The bromine radical is thought to be generated in situ by continuous aerobic photo-oxidation of the bromine anion from MgBr2 centre dot Et2O,and to effect this oxidation reaction.
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