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A suspension of 2,6-diisopropylphenol (5.32 g) in 35 ml of trifluoroacetic anhydride is treated with 1.75 ml of glacial acetic acid under a nitrogen atmosphere. Upon completion of the addition of acetic acid, the solids are in mixture. Solvent evaporation gives an oil which is taken up in 150 ml of ethyl acetate and washed twice with saturated aqueous sodium bicarbonate and once with saline. Drying of the organic layer with sodium sulfate followed by filtration and solvent evaporation gives 6.55 g of an oil which is chromatographed on 330 g of silica gel eluting with chloroform/hexane (9/1). The appropriate fractions are pooled and concentrated to give the title compound, NMR (CDCl3, TMS) 7.2, 2.91, 2.36, 1.20.

1. customSolvent evaporation
2. customgives an oil which
3. washwashed twice with saturated aqueous sodium bicarbonate and once with saline
4. dry with materialDrying of the organic layer with sodium sulfate
5. filtrationfollowed by filtration and solvent evaporation