4-t-Butyl-2-(4-t-butylbenzoyl)benzoic acid → 2,7-Di-t-butylanthraquinone

Participants

Reaction Conditions

Reaction Steps

Into a 500 ml flask having the egg plant shape equipped with a condenser, 200 ml of polyphosphoric acid was placed and heated at 150° C. Then, 32 g (95 mmole) of 4-t-butyl-2-(4-t-butylbenzoyl)benzoic acid was added in small portions, and the resultant mixture was stirred at the same temperature for 3 hours. After the reaction was completed, the reaction mixture was poured into ice water, and the resultant mixture was treated by liquid-liquid extraction with chloroform. After being dried with magnesium sulfate, the extract was concentrated under a reduced pressure by a rotary evaporator. The obtained crude crystals were recrystallized from hexane, and 21 g of the anthraquinone compound of the object compound was obtained (the yield: 69%; yellow crystals).

Provenance & Evidence