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A highly efficient and selective carbon–carbon double bonds cleavage of styrene compounds involving molecular oxygen was achieved using TBHP as a free radical initiator in diethylene glycol diethyl ether medium. Various styrene compounds, such as phenyl acrylic acids and its esters, 2-substituted 3-phenyl acrylic acids and its esters, chalcones, 4-phenyl-3-buten-2-one and bis(2-phenylvinyl) ketone, 5-benzylidene-1,3-dimethyl-pyrimidine-2,4,6-triones, could be effectively oxidized into the corresponding aryl carbonyl compounds, and the yield was up to 99%. A suitable mechanism was proposed. Gram-level synthesis further illustrated the practicality of our method.