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0 °C

Acetylsalicylic acid (50 mg.) and 4-amino-2,6-dimethylphenol (38 mg.) were dissolved in ethylene glycol (5 ml.) to which under cooling at 0° C. was added dicyclohexyl carbodiimide (65 mg.). After reaction for several hours the formed dicyclohexylurea was filtered off and the filtrate evaporated to dryness to give a powder which was dissolved in acetone (2 ml.); after adding 2 N sodium hydroxide (4 ml.), the solution was allowed to stand for several hours at room temperature. The addition of 2 N hydrochloric acid (20 ml.) gave a precipitate which was collected by filtration, washed with water and dried at 50° C. under reduced pressure to give solid 2',4-dihydroxy-3,5-dimethylbenzanilide as a powder which was then purified by column chromatography using Sephadex LH-20 resin and elution with methanol. The eluate was evaporated to dryness to give a solid which was recrystallized from aqueous acetone to give white crystals (57.8 mg.) of 2',4-dihydroxy-3,5-dimethylbenzanilide. Yield: 80.9%. Melting point: 142°-145° C.

1. filtrationwas filtered off
2. customthe filtrate evaporated to dryness
3. customto give a powder which
4. waitto stand for several hours at room temperature
5. customgave a precipitate which
6. filtrationwas collected by filtration
7. washwashed with water
8. customdried at 50° C. under reduced pressure