2-Chlorobenzoic acid is an organic compound with the formula ClC6H4CO2H.

This white solid is used as a precursor to a variety of drugs, food additives, and dyes.

The laboratory scale reaction employs potassium permanganate.

The chloride is readily replaced by ammonia to 2-aminobenzoic acid.

Similarly, the chloride is displaced by diphenylphosphide, leading to 2-diphenylphosphinobenzoic acid.