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The antioxidant action of thiophenes is shown to be due to a heterolytic decomposition of hydroperoxides effected by SO 2 (H 2 SO 4 ) which is liberated from the thiophene. Thus, the initiation level in an autoxidizing alkylaromatic compound ( n ‐hexylbenzene) is decreased and the oxidation is further inhibited by phenol, the heterolysis product of the hydroperoxide. At low thiophene concentrations the inhibition is counterbalanced by the low initiation level in such a way that the oxidation continues to proceed at a constant rate. The effect of substituents, of the concentration and of added bases on the antioxidant activity of thiophenes is reported.
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Tilborg et al. (1976) studied this question.
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