Thionyl Chloride → p-Sulfomethylphenylacetyl Chloride

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Reaction Steps

To a solution of thionyl chloride in 20 ml of anhydrous ether is added p-sulfomethylphenylacetic acid. The mixture is stirred at room temperature until gas evolution ceases. Two drops of dimethylformamide is added, and the resulting mixture is stirred at 40° C. for 2.5 hours. The title compound is obtained after filtration and evaporation of the reaction mixture. The infrared spectrum of the product shows a characteristic acid chloride absorption at 1830 cm-1 whereas the starting acid shows a carbonyl absorption at 1740 cm-1.

Provenance & Evidence