In 1979 we reported an azeotropic procedure for preparing anhydrous solutions of ferf-butyl hydroperoxide in a variety of solvents.1 We noted that azeotropically dried solutions of TBHP in benzene and toluene were very stable to storage, whereas solutions prepared by using halogenated solvents (e.g., CH2C12 and C1CH2CH2C1) were less stable, releasing oxygen even at freezer temperatures.Benzene, in every other way the ideal solvent for this process, was rejected due to its supposed toxicity. Thus,
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