Author Topic: K2S2O8 oxidation of o/m-cresol to toluhydrochinone  (Read 7567 times)

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K2S2O8 oxidation of o/m-cresol to toluhydrochinone
« on: May 08, 2004, 03:25:00 PM »

Patent DE81068

preparation of hydrochinone

3kg potassium persulfate are gradually introduced Into a solution of 1.2kg phenol and 2.5kg NaOH in 75Kg H2O. The mixture is left alone for 1 to 2 days at room temp or 40°C. After the rxn is over carbonic acid is introduced, the unreacted phenol is removed by steam distillation, the remainder is boiled with dilute HCl or H2SO4 and the hydrochinone extracted with Et2O.

preparation of toluhydrochinone

If equivalent amounts of ortho- or meta-cresol are treated as above an oily residuum remains, which, when recrystallized from benzene, gives toluhydrochinone with a mp of 124°C