Kojic Acid → Chlorokojic acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

50 g(351.8 mmol) of kojic acid was dissolved in 250 ml of N,N-dimethylformamide. The resulting solution was cooled in an ice bath of 10° C. and 30 ml(411.3 mmol) of thionyl chloride was added dropwise thereto. The mixture was stirred at room temperature for 2 hours and 2000 ml of ice water was added. The precipitate was filtered and dissolved into 1000 ml of ethyl acetate. The reaction product was dried over magnesium sulfate, decolored with active charcoal and filtered. The filtrate was concentrated and hexane was added to give crystals, which were then dried under vacuum to give 37.5 g(66.83%) of the desired chlorokojic acid as a yellow solid.

Herkunft & Nachweise