Hydrochloric Acid → 2-(3,4-Dimethoxyphenyl)-m-dithiane-2-propionic acid

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Reaction Steps

50 g of 3-veratroylpropionic acid in 400 ml of chloroform and 22.7 g of 1,3-propanedithiol are treated with hydrogen chloride up to saturation while stirring. After 3 hours at room temperature, the solution is evaporated to 50 ml and diluted with ether. The resulting solution is extracted three times with 5% sodium carbonate. The basic phases are combined and made acidic with concentrated hydrochloric acid. The precipitated product is extracted with ether/methylene chloride (1:3). The organic extracts are dried and evaporated. The residue is recrystallized from ethanol, there being obtained 2-(3,4-dimethoxyphenyl)-m-dithiane-2-propionic acid of melting point 134°-135° C.

Provenance & Evidence