Hydrogen Peroxide → 4-Chloro-3-ethylsulfinyl-2-methylbenzoic acid

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Reaction Steps

1.15 g (4.98 mmol) of 4-chloro-3-ethylthio-2-methylbenzoic acid in 10 ml of glacial acetic acid were heated to a temperature of 50° C.-60° C. At this temperature, 484 mg (35% strength, 4.98 mmol) of an aqueous hydrogen peroxide solution were added dropwise. The mixture was stirred at this temperature for 5 h. The reaction mixture was cooled, washed with an aqueous saturated sodium bisulfite solution and, after analytical proof of absence of peroxides, freed from the solvents. Water was added to the residue, and the mixture was acidified with 6M HCl. The mixture was extracted with ethyl acetate, and the combined organic phases were dried, filtered and, under reduced pressure, freed from the solvent. 1.24 g of the product (purify about 95% by weight) were isolated.

Provenance & Evidence