4-Chlorophthalic acid(CAS: 89-20-3)

4-Chlorophthalic acid (CAS: 89-20-3) is a crystalline solid with a molecular weight of 152.55 g/mol. It is slightly soluble in water. Chemically, it is reactive towards bases and can undergo esterification reactions. It is stable under normal conditions but should be stored in a dry place to prevent hydrolysis.

4-Chlorophthalic acid can be synthesized by chlorinating phthalic anhydride. The process involves the reaction of phthalic anhydride with chlorine gas in the presence of a phase transfer catalyst. The yield is around 85-90%, and the product is purified by recrystallization.

4-Chlorophthalic acid is used in the pharmaceutical industry for the synthesis of certain drugs, in the polymer industry for producing polyesters, and in the sensor industry for creating sensors. It also finds applications in the semiconductor industry for surface treatment.

When handling 4-Chlorophthalic acid (CAS: 89-20-3), it is important to use gloves, safety glasses, and a lab coat. Work in a fume hood to avoid inhalation of fumes. Spills should be cleaned up using appropriate absorbents, and the material safety data sheet (MSDS) should be consulted for specific safety guidelines.