5-Hydroxy-1-naphthalenesulfonic acid(CAS: 117-59-9)

5-Hydroxy-1-naphthalenesulfonic acid is a crystalline compound with a molecular weight of approximately 212.21 g/mol. It has a low solubility in water, around 2.5 g/L at 20°C. Chemically, it exhibits basic properties and can react with acids to form salts. It is stable under normal conditions but may undergo hydrolysis in the presence of strong bases.

5-Hydroxy-1-naphthalenesulfonic acid is commonly synthesized through the sulfonation of 1-naphthol followed by oxidation of the sulfonate group. This process involves the use of a sulfonation catalyst, such as concentrated sulfuric acid, and an oxidizing agent like potassium permanganate. The yield is typically around 80-85%, with good selectivity towards the desired product.

5-Hydroxy-1-naphthalenesulfonic acid finds application in the pharmaceutical industry for the synthesis of certain drugs, in the sensor industry for the development of naphthalene-based sensors, and in the semiconductor industry for etching processes. It is also used in the preparation of dyes and pigments.

Precautions when handling 5-Hydroxy-1-naphthalenesulfonic acid include the use of proper personal protective equipment (PPE) such as gloves, goggles, and a lab coat. It should be stored in a cool, dry place away from heat sources. In case of a spill, it should be cleaned up with appropriate absorbent materials, and the area should be well-ventilated. Always refer to the Safety Data Sheet (SDS) for detailed safety information.