5,6-Dichloro-3-pyridinesulfonyl chloride(CAS: 98121-40-5)

5,6-Dichloro-3-pyridinesulfonyl chloride is a white to off-white crystalline solid with a molecular weight of approximately 257.05 g/mol. It is slightly soluble in water but readily soluble in organic solvents such as methanol and acetone. This compound is highly reactive, particularly towards nucleophiles and can undergo sulfonation reactions. It has a pKa of approximately 2.5, indicating its acidic nature.

5,6-Dichloro-3-pyridinesulfonyl chloride is synthesized by the chlorosulfonation of 3-pyridinesulfonic acid. This process typically involves the reaction of 3-pyridinesulfonic acid with chlorine gas in the presence of a catalyst such as thionyl chloride. The reaction is carried out under mild conditions, and the product is obtained in good yield through distillation.

5,6-Dichloro-3-pyridinesulfonyl chloride is primarily used in the pharmaceutical and chemical industries. It serves as a key intermediate in the synthesis of various drugs and other chemical compounds. Due to its reactivity, it is also utilized in the preparation of functionalized polymers and in the development of sensors and semiconductors.

Handling 5,6-Dichloro-3-pyridinesulfonyl chloride requires appropriate personal protective equipment (PPE) such as gloves, goggles, and a lab coat. This compound should be handled in a fume hood due to its volatility and potential for inhalation hazards. In case of a spill, it should be cleaned up carefully using appropriate absorbent materials. It is recommended to refer to the Safety Data Sheet (SDS) for detailed emergency procedures and storage instructions.