4-Chloroaniline-2-sulfonic acid is an important aromatic sulfonic acid derivative used as a key intermediate in dye and pharmaceutical manufacturing. This compound decomposes at 300-340°C and exhibits moderate water solubility (3.13 g/L at 0°C). The sulfonic acid group at the ortho position and chloro group at the para position make it particularly valuable for synthesizing azo dyes and sulfa drugs. Storage should be in dry, well-ventilated conditions at room temperature. Safety precautions are necessary due to its irritating properties (GHS Category 2) - avoid dust formation and use personal protective equipment. The compound's synthesis typically involves sulfonation of 4-chloroaniline with concentrated sulfuric acid.
