Acetic Acid → HCID 22621067, compound

Participants

Reaction Steps

A mixture of concentrated sulphuric acid (128 ml) and acetic acid (192 ml) was added with stirring to 4-bromo-3-ethoxy-2-(N-ethyl-N-methylsulphonylamino)benzoic acid (8.8 g) at 85° C. for 100 minutes and left to stand at ambient temperature for 3 days. After pouring onto excess water, the mixture was made neutral by the careful addition of sodium hydroxide solution with cooling, extracted with ethyl acetate, dried (anhydrous magnesium sulphate) and the solvent evaporated to give 4-bromo-2-ethylamino-3-ethoxybenzoic acid (4.74 g) as a brown solid, m.p. 129°-139° C.

Provenance & Evidence