u03b1 u2032 isopropenylbenzene c 16 h 24 o 2 corresponding respectively to the sum of the meta and para isomers of each of the compounds this represents a yield of u03b1 u03b1 u2032 bis tert butylperoxy diisopropylbenzene of 92 relative to the diol engaged the material balance on these three aromatic products is 93 relative to the diol engaged the process is performed in the same manner as in example 1 but using cumyl alcohol as tertiary alcohol and the operating conditions described in the table below the process is performed in the same manner as in example 1 but using cumyl alcohol as tertiary alcohol cumyl hydroperoxide as tertiary hydroperoxide and cumene as solvent and the operating conditions described in the table below the process is performed in the same manner as in example 1 but using tert amyl alcohol as tertiary alcohol tert amyl hydroperoxide as tertiary hydroperoxide and methanesulfonic acid msa and the operating conditions described in the table below it will be noted here that this example 1 quatro corresponds to the definition of the main claim claim 1 but not to the dependent claims 2 and 3 the process is performed in the same manner.