Decomposition of p-diisopropylbenzene dihydroperoxide in a benzene solution by hydrogen chloride could be carried out quantitatively in a saturated benzene solution at the temperature range of 2040°C, and its yield was 9293%, while that of acetone was found in 7377%. The formed hydroquinone was highly pure (98%). Similar decomposition also took place by using SO2. However, the decomposition by hydrochloric acid gas gave a better result.
