Abstract
We have examined the antioxidant activities, both in tetralin oxidation induced by an azo initiator and in tetralin under thermoxidative conditions of a series of tetramethyl-6-chromanols with a methyl thiomethyl, phenyl thiomethyl, methyl thiopropionate, and thiopropionate group. The antioxidants tested showed almost the same activity for the oxidation of tetralin induced by an azo initiator at 61 °C. At high temperature, we found that tetramethyl-6-chromanols with a thiopropionate group increased the induction period for ortho to the OH group by 7.5-fold and meta to the OH group by 10.7-fold, compared with that for pentamethyl-6-chromanol.
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