The photodegradation of BHT originated a wider range of structures, eight of which were tentatively identified (Table 4). During
the photolytic process, the aromatic system of BHT can be attacked
through hydroxylation in para-position to the hydroxyl group, and
subsequently undergo o-methylation, yielding 2,6-ditert-butyl-4-
methoxy-4-methyl-2,5-cyclohexadien-1-one (BH2)