potassium tert-butylate in tert-butyl alcohol byproducts: t-BuOMe; Fe complex added to soln. of t-BuOK in t-BuOH, mixture stirred overnight; distn.;

sulfuric acid in water Fe complex added to aq. H2SO4, extracted with Et2O, aq. NH4PF6 added; extn. (CH2Cl2), washing with H2O, drying over MgSO4, evapn.;