Hydrochloric Acid → Methyl 4-sulphamoylbenzoate

Participants

Reaction Steps

A slurry of 30.2 g (0.15 mole) of p-carboxybenzenesulfonamide in 500 ml of methanol was treated with 30 g of anhydrous hydrogen chloride and the mixture was heated at reflux temperature for 3 hr. The solution was concentrated under vacuum to give 32.3 g of white, crystalline residue. A 5.0 g portion of this residue was recrystallized from 25 ml of methanol to give 3.3 g of title compound as a white powder, mp 174°-178° C.

Provenance & Evidence